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Ngc 4178



 
 
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  #1  
Old November 21st 14, 08:03 AM
WA0CKY WA0CKY is offline
Senior Member
 
First recorded activity by SpaceBanter: Feb 2008
Posts: 689
Default Ngc 4178

NGC 4178 is a rather odd barred spiral in northern Virgo some 33 to 55 million light-years distant. Redshift puts it at 33 million light-years but the mean of Tully Fisher measurements puts it at 55 million light-years. Most agree it is a true member of the Virgo Cluster thus making the Tully Fisher distance most likely the more accurate. Members of the cluster often show high velocities, some so high they are blue shifted. Also the detail seen not only in my image but those of major scopes is consistent with the greater distance. NED shows it classified as SB(rs)dm HII. With the low redshift H alpha emission would be within the passband of my filter. I intended to take at least one image to see if I'd pick it up in the blue star clouds but weather never cooperated so that didn't happen.

Edit:
The galaxy is rather unique in that it is the home of the smallest known supermassive black hole. See this link http://www.universetoday.com/98168/a...ve-black-hole/ for more information.

The galaxy has a long central bar and no real central bulge. Only a hint of a spiral arm comes off the southern end of the bar while a weak on comes from the northern bar. Much of its disk is rather featureless with very little spiral structure. The only structure being provided by what appear to be randomly placed star clouds. The galaxy was discovered by John Herschel on April 11, 1825. It is also shows as discovered three quarters of a century later on September 6, 1900 by the German astronomer, Arnold Schwassmann, and listed as IC 3042. Being quite flat with little central bulge it made the 2 Micron Flat Galaxy Catalog as 2MFGC 09611.

To the southeast is a "small" face on spiral about a billion light-years distant. Thus it is really quite large, about 145,000 light-years across in fact. It's only its great distance that makes it appear small.

I've marked a star-like object as Q? in the annotated image that is south and a bit west of NGC 4178. NED's position has a 10 second error bar for a 21st magnitude quasar. This object is the only thing I see about 21st magnitude (20.7 by my reading) in the area. Certainly nothing else is in the area that is about that brightness. But it is about 18 seconds from the position shown for the quasar so not in the 10 second error bar. Checking the Sloan image shows nothing within the error bar's range down to 24th magnitude so I've marked the only possible candidate. Still the entire object may be erroneous so I've labeled it with a question mark for its identification being questionable.

A quasar candidate (QC) is noted only about 1.5 billion light-years distant west of NGC 4178. It's PSF is that of a small disk galaxy not a quasar. The Sloan image shows a bright core in the center of a faint rather featureless disk galaxy same as my PSF indicates. One catalog at NED does say it is a galaxy, two a quasar and one an Ultra violet source. It certainly is some type of AGN but the quasar seems dim for one at that close distance.

Four asteroids snuck into the image. Details are on the annotated image. One was moving very slowly making a very short trail in 40 minutes indicating it was caught just as it was changing from prograde motion to retrograde motion.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

http://www.spacebanter.com/attachmen...2&d=1416552923

http://www.spacebanter.com/attachmen...3&d=1416552938

http://www.spacebanter.com/attachmen...4&d=1416552947

Rick
Attached Thumbnails
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Last edited by WA0CKY : December 21st 14 at 06:50 AM. Reason: Additional information
  #2  
Old November 22nd 14, 02:09 AM posted to alt.binaries.pictures.astro
Skywise
external usenet poster
 
Posts: 318
Default Ngc 4178

There is definately a problem with this post.

I see the three images decoded just fine, but I also get pieces
of UUENCODE text in between the images.

After examining the raw text, it appears a tail section of the
encoded text got repeated somehow.

If you look at the following image, I show the raw text and the
decoded version side-by-side via screen captures. I am hosting
the image on my own page to guarantee everyone being able to see
the problem. Don't want your news clients trying to interpret
the quoted code. I highlighted in orange the repeated text for
clarity.

http://www.skywise711.com/misc/WA0CKY-001.png

It also happened to the second image in the post with about
three times as many lines repeating. The last image does not
have any repeat.

BTW, WA0CKY/Rick, I really love the quality of your work, and
the time you take to describe the images.

Brian
--
http://www.earthwaves.org/forum/index.php - Earth Sciences discussion
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Sed quis custodiet ipsos Custodes?
  #3  
Old December 16th 14, 08:55 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default Ngc 4178

Rick,

at first I thought "how could I have missed such a nice galaxy" until I
noticed that it is at -20 degrees. Would have been in zenith in Namibia.
Interesting to read about the "mystery object". Now if we could get Hubble
to take a closer look...

Stefan

"WA0CKY" schrieb im Newsbeitrag ...


NGC 4178 is a rather odd barred spiral in northern Virgo some 33 to 55
million light-years distant. Redshift puts it at 33 million light-years
but the mean of Tully Fisher measurements puts it at 55 million
light-years. Most agree it is a true member of the Virgo Cluster thus
making the Tully Fisher distance most likely the more accurate. Members
of the cluster often show high velocities, some so high they are blue
shifted. Also the detail seen not only in my image but those of major
scopes is consistent with the greater distance. NED shows it classified
as SB(rs)dm HII. With the low redshift H alpha emission would be within
the passband of my filter. I intended to take at least one image to see
if I'd pick it up in the blue star clouds but weather never cooperated
so that didn't happen.

The galaxy has a long central bar and no real central bulge. Only a
hint of a spiral arm comes off the southern end of the bar while a weak
on comes from the northern bar. Much of its disk is rather featureless
with very little spiral structure. The only structure being provided by
what appear to be randomly placed star clouds. The galaxy was
discovered by John Herschel on April 11, 1825. It is also shows as
discovered three quarters of a century later on September 6, 1900 by the
German astronomer, Arnold Schwassmann, and listed as IC 3042. Being
quite flat with little central bulge it made the 2 Micron Flat Galaxy
Catalog as 2MFGC 09611.

To the southeast is a "small" face on spiral about a billion light-years
distant. Thus it is really quite large, about 145,000 light-years
across in fact. It's only its great distance that makes it appear
small.

I've marked a star-like object as Q? in the annotated image that is
south and a bit west of NGC 4178. NED's position has a 10 second error
bar for a 21st magnitude quasar. This object is the only thing I see
about 21st magnitude (20.7 by my reading) in the area. Certainly
nothing else is in the area that is about that brightness. But it is
about 18 seconds from the position shown for the quasar so not in the 10
second error bar. Checking the Sloan image shows nothing within the
error bar's range down to 24th magnitude so I've marked the only
possible candidate. Still the entire object may be erroneous so I've
labeled it with a question mark for its identification being
questionable.

A quasar candidate (QC) is noted only about 1.5 billion light-years
distant west of NGC 4178. It's PSF is that of a small disk galaxy not a
quasar. The Sloan image shows a bright core in the center of a faint
rather featureless disk galaxy same as my PSF indicates. One catalog at
NED does say it is a galaxy, two a quasar and one an Ultra violet
source. It certainly is some type of AGN but the quasar seems dim for
one at that close distance.

Four asteroids snuck into the image. Details are on the annotated
image. One was moving very slowly making a very short trail in 40
minutes indicating it was caught just as it was changing from prograde
motion to retrograde motion.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

http://tinyurl.com/l7pkndd

http://tinyurl.com/orvg7b6

http://tinyurl.com/p9hg4tm

Rick


--
WA0CKY

  #4  
Old December 16th 14, 10:07 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default Ngc 4178


"Skywise" schrieb im Newsbeitrag ...


There is definately a problem with this post.



It works fine in Outlook Express

Maybe sometimes it is good to go with the mainstream ;-)

Stefan

  #5  
Old December 17th 14, 04:06 AM posted to alt.binaries.pictures.astro
Skywise
external usenet poster
 
Posts: 318
Default Ngc 4178

"Stefan Lilge" wrote in :


"Skywise" schrieb im Newsbeitrag ...


There is definately a problem with this post.



It works fine in Outlook Express

Maybe sometimes it is good to go with the mainstream ;-)


I doubt it was my news client.

I just deleted and redownloaded the post in question and it was fine.

Anyway, it was the only time I personally had an issue, and it
looks like it was just gremlims in the interwebz.

Brian
--
http://www.earthwaves.org/forum/index.php - Earth Sciences discussion
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Sed quis custodiet ipsos Custodes?
  #6  
Old December 21st 14, 06:53 AM
WA0CKY WA0CKY is offline
Senior Member
 
First recorded activity by SpaceBanter: Feb 2008
Posts: 689
Default

Additional information added to the post I forgot to include originally.
Rick
____________

Quote:
Originally Posted by WA0CKY View Post
NGC 4178 is a rather odd barred spiral in northern Virgo some 33 to 55 million light-years distant. Redshift puts it at 33 million light-years but the mean of Tully Fisher measurements puts it at 55 million light-years. Most agree it is a true member of the Virgo Cluster thus making the Tully Fisher distance most likely the more accurate. Members of the cluster often show high velocities, some so high they are blue shifted. Also the detail seen not only in my image but those of major scopes is consistent with the greater distance. NED shows it classified as SB(rs)dm HII. With the low redshift H alpha emission would be within the passband of my filter. I intended to take at least one image to see if I'd pick it up in the blue star clouds but weather never cooperated so that didn't happen.

Edit:
The galaxy is rather unique in that it is the home of the smallest known supermassive black hole. See this link http://www.universetoday.com/98168/a...ve-black-hole/ for more information.

The galaxy has a long central bar and no real central bulge. Only a hint of a spiral arm comes off the southern end of the bar while a weak on comes from the northern bar. Much of its disk is rather featureless with very little spiral structure. The only structure being provided by what appear to be randomly placed star clouds. The galaxy was discovered by John Herschel on April 11, 1825. It is also shows as discovered three quarters of a century later on September 6, 1900 by the German astronomer, Arnold Schwassmann, and listed as IC 3042. Being quite flat with little central bulge it made the 2 Micron Flat Galaxy Catalog as 2MFGC 09611.

To the southeast is a "small" face on spiral about a billion light-years distant. Thus it is really quite large, about 145,000 light-years across in fact. It's only its great distance that makes it appear small.

I've marked a star-like object as Q? in the annotated image that is south and a bit west of NGC 4178. NED's position has a 10 second error bar for a 21st magnitude quasar. This object is the only thing I see about 21st magnitude (20.7 by my reading) in the area. Certainly nothing else is in the area that is about that brightness. But it is about 18 seconds from the position shown for the quasar so not in the 10 second error bar. Checking the Sloan image shows nothing within the error bar's range down to 24th magnitude so I've marked the only possible candidate. Still the entire object may be erroneous so I've labeled it with a question mark for its identification being questionable.

A quasar candidate (QC) is noted only about 1.5 billion light-years distant west of NGC 4178. It's PSF is that of a small disk galaxy not a quasar. The Sloan image shows a bright core in the center of a faint rather featureless disk galaxy same as my PSF indicates. One catalog at NED does say it is a galaxy, two a quasar and one an Ultra violet source. It certainly is some type of AGN but the quasar seems dim for one at that close distance.

Four asteroids snuck into the image. Details are on the annotated image. One was moving very slowly making a very short trail in 40 minutes indicating it was caught just as it was changing from prograde motion to retrograde motion.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

http://www.spacebanter.com/attachmen...2&d=1416552923

http://www.spacebanter.com/attachmen...3&d=1416552938

http://www.spacebanter.com/attachmen...4&d=1416552947

Rick
 




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