|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
ASTRO: Another Arp 273
The large galaxy is UGC 1810, the other spiral UGC 1813. They are
located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#2
|
|||
|
|||
ASTRO: Another Arp 273
Nice image Rick. What magnitude are these?
Joe "Rick Johnson" wrote in message ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". ---------------------------------------------------------------------------- ---- |
#3
|
|||
|
|||
ASTRO: Another Arp 273
J McBride wrote: Nice image Rick. What magnitude are these? Joe Galaxy magnitudes can be highly misleading as to ability to see visually. I've not tried these so don't know if my 14" can show them or not. NED lists 1810 at 13.42 and 1813 at 15.08. Rather bright for what I see in the data though the cores of both are very bright compared to the rest of the galaxy making processing "interesting" to show detail in the core yet bring out the fainter outer parts. How much that star seen atop 1810 is included in the estimate I don't know but would bet it had an effect making it appear brighter than it really is. The faint ones around the pair go down below 21nd magnitude. Some must be fainter as they just don't register in the astrometry program when I try to click on them. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#4
|
|||
|
|||
ASTRO: Another Arp 273
Rick,
funny that we have posted these at the same time. This sure is an interesting pair. Looks more impressive at your 1x1 binning scale, I should have imaged with the focal reducer nearer to the camera to get a larger scale (seeing would have been good enough to support a larger scale). Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#5
|
|||
|
|||
ASTRO: Another Arp 273
Wonderful Rick and Stefan,
i am very interested by ARP objects. It is about 1 week that i am reading the book "The Arp Atlas of Peculiar Galaxies A Chronicle and Observer's Guide" and i like it too much. Now i see your images, that are wonderful. I want to try somehow, using my C9,25 and H9C. Maybe in binning 2x2. Using the FLT110 f7 , would be too difficult i think. just for ARP/Messier objects. What do you think ?? Thanks for sharing Fabio E-mail : Website : http://www.fabioh2o.it "Rick Johnson" ha scritto nel messaggio ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#6
|
|||
|
|||
ASTRO: Another Arp 273
Fabio, I think you would be better of using the C9.25 with a focal reducer.
Aperture counts if you want to image small galaxies. I you use a reducer I would not use binning. Stefan "Fabio" schrieb im Newsbeitrag . .. Wonderful Rick and Stefan, i am very interested by ARP objects. It is about 1 week that i am reading the book "The Arp Atlas of Peculiar Galaxies A Chronicle and Observer's Guide" and i like it too much. Now i see your images, that are wonderful. I want to try somehow, using my C9,25 and H9C. Maybe in binning 2x2. Using the FLT110 f7 , would be too difficult i think. just for ARP/Messier objects. What do you think ?? Thanks for sharing Fabio E-mail : Website : http://www.fabioh2o.it "Rick Johnson" ha scritto nel messaggio ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#7
|
|||
|
|||
ASTRO: Another Arp 273
Great minds think alike it seems, and procrastinate alike as well it
appears. Least I had this one on my hard drive for a couple months before I got around to working on it then it sat another month before it worked its way to the top of my posting pile. It is rare I get a night I can work at 0.5" per pixel (1x1 binning). It never happens in winter. This time of the year seeing is so bad I often have to go to 1.5" and even that is blurry. I've got way too many of those on the hard drive hoping for better seeing so I can redo the Lum part. Doesn't hurt color so much. Last night it "only" hit -34C but froze the filter wheel. I had to go out and give it a heat treatment to thaw it. Then all was fine. Next I came in to find I couldn't reach focus. As the temp drops the focal point moves back and the focuser had reached max (I keep the mirror locked). So again had to go out and unlock the mirror, run the external focuser in (it's slow so that took 3 minutes on the "in" button), then came the "fun" part. Since the laptop's screen dies at such temps and does so almost instantly I had to then move the mirror to the right spot to match where I'd put the 3" Crawford focuser. That took about 5 trips back into the house to take another test shot then run out and try again. Finally got it working in time to get some data before the moon rose. At least I'm now set for the rest of winter with the focuser but once moisture starts freezing the filter wheel I'll likely have to thaw it out nearly every night or take the camera off and bring it in the house to dry out but that first soaks it as it hits the warm air in the house. So it is often easier to deal with the frozen wheel when it happens. I have heat tape somewhere I got for the camera to warm it when not in use. That worked last year to keep things dry and working. I'd turn it off a couple hours before using to let it cool down. But can't find where I stored it for summer! Thought I just left it in the observatory but obviously didn't. Rick Stefan Lilge wrote: Rick, funny that we have posted these at the same time. This sure is an interesting pair. Looks more impressive at your 1x1 binning scale, I should have imaged with the focal reducer nearer to the camera to get a larger scale (seeing would have been good enough to support a larger scale). Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#8
|
|||
|
|||
ASTRO: Another Arp 273
I can see it will be a several year project to image all Arp's I can see
from my location. I have trouble in winter below the celestial equator with only a rather narrow window that works below it due to ice crystals over the lake and many of those between 0 and -15 degrees (my southern limit due to seeing and ice) is small letting many escape my photon detector. Which scope to use depends on which Arp you are imaging. Most are very small, well under a minute of arc across so you will want as large an image scale as your seeing can support. I used 0.5" per pixel for this one though that's rarely allowed by my seeing. 1.0" per pixel is more common for my location. Others are large like Arp 26 = M 101. There are quite a few Messier objects in the list. I still have Arp 134=M49 and Arp 168=M32 to go. The latter got past me this year so will try again next. A few URL's I use a lot a http://arpgalaxy.com/arpord.html Shows Arps in order and thus by Arp's classification http://arpgalaxy.com/arplist.html Arps in R.A. order. Useful for planning a night's imaging run. http://nedwww.ipac.caltech.edu/level..._contents.html Palomar photos of all Arp's in an easy to use interface. Most are taken with the 200" though large ones are from the POSS plates. There's an amateur in France (I think that's it), can't recall his URL as it is in a different computer, that has almost completed the list. Google should turn it up. He's using an 8" SCT with compressor so image scale can be very small but they are there. It's a fun project. Rick Fabio wrote: Wonderful Rick and Stefan, i am very interested by ARP objects. It is about 1 week that i am reading the book "The Arp Atlas of Peculiar Galaxies A Chronicle and Observer's Guide" and i like it too much. Now i see your images, that are wonderful. I want to try somehow, using my C9,25 and H9C. Maybe in binning 2x2. Using the FLT110 f7 , would be too difficult i think. just for ARP/Messier objects. What do you think ?? Thanks for sharing Fabio E-mail : Website : http://www.fabioh2o.it "Rick Johnson" ha scritto nel messaggio ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#9
|
|||
|
|||
ASTRO: Another Arp 273
Thank you Stefan and Rick, some night in the future i'll try some object...
Regards Fabio "Rick Johnson" ha scritto nel messaggio ster.com... I can see it will be a several year project to image all Arp's I can see from my location. I have trouble in winter below the celestial equator with only a rather narrow window that works below it due to ice crystals over the lake and many of those between 0 and -15 degrees (my southern limit due to seeing and ice) is small letting many escape my photon detector. Which scope to use depends on which Arp you are imaging. Most are very small, well under a minute of arc across so you will want as large an image scale as your seeing can support. I used 0.5" per pixel for this one though that's rarely allowed by my seeing. 1.0" per pixel is more common for my location. Others are large like Arp 26 = M 101. There are quite a few Messier objects in the list. I still have Arp 134=M49 and Arp 168=M32 to go. The latter got past me this year so will try again next. A few URL's I use a lot a http://arpgalaxy.com/arpord.html Shows Arps in order and thus by Arp's classification http://arpgalaxy.com/arplist.html Arps in R.A. order. Useful for planning a night's imaging run. http://nedwww.ipac.caltech.edu/level..._contents.html Palomar photos of all Arp's in an easy to use interface. Most are taken with the 200" though large ones are from the POSS plates. There's an amateur in France (I think that's it), can't recall his URL as it is in a different computer, that has almost completed the list. Google should turn it up. He's using an 8" SCT with compressor so image scale can be very small but they are there. It's a fun project. Rick Fabio wrote: Wonderful Rick and Stefan, i am very interested by ARP objects. It is about 1 week that i am reading the book "The Arp Atlas of Peculiar Galaxies A Chronicle and Observer's Guide" and i like it too much. Now i see your images, that are wonderful. I want to try somehow, using my C9,25 and H9C. Maybe in binning 2x2. Using the FLT110 f7 , would be too difficult i think. just for ARP/Messier objects. What do you think ?? Thanks for sharing Fabio E-mail : Website : http://www.fabioh2o.it "Rick Johnson" ha scritto nel messaggio ster.com... The large galaxy is UGC 1810, the other spiral UGC 1813. They are located about 330 million light years away at the southeast corner of Andromeda. It's obvious that UGC 1810 is highly distorted. One arm looks more like Saturn's F ring than a spiral arm and seems to make a complete ring about the galaxy. It's hard to tell if NGC 1813 is distorted. It looks greatly distorted to me as the arms are almost straight but that is seen in other barred spirals. But it has faint a faint arm that curls back and runs along the bar while the ends of the bar, if it is a bar, seem to end differently. The left one ends in a faint blob while the right one seems to merge with the outer ring of UGC 1810. In any case they curve very differently, likely due to the near collision. To appear so large at such a great distance these have to be two very large spiral galaxies. When galaxies pass by like this they trigger massive star formation. We see it in the arms of the bigger galaxy UGC 1810, this is common, but it is confined to the very core of UGC 1813. This is very unusual. Also UGC 1810 is a LINER galaxy indicating it has a nearly starved black hole at its core. So we know the near miss hasn't yet caused a feast for the black hole by sending matter its way. Yet UGC 1813 seems to have a heck of a lot of disturbance at its core to trigger so much star formation. This all goes to show it is very hard to predict just what will happen in a near miss like these two have encountered. Nor do we know what long term changes it will trigger. I can't even find if the two are gravitationally bound. If so they will merge in the future. 14" LX200R @ f/10, L=6x10' binned 1x1, RGB=2x10' binned 2x2, STL-11000XM, Paramount ME Image scale = 0.5" per pixel rather than my usual 1" per pixel. Note that Stefan's FOV is somewhat larger than mine. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | May 3rd 07 01:08 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | May 3rd 07 01:08 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | April 12th 07 01:05 AM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | SETI | 0 | May 3rd 06 12:33 PM |
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) | [email protected] | Astronomy Misc | 0 | October 6th 05 02:34 AM |