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#21
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LHC: "WIMPs" Not Observed (6/4/12)
On Jun 17, 10:04*am, Phillip Helbig---undress to reply
wrote: It is an X-ray telescope. *It can observe anything which is sufficiently bright in the wavelengths it is sensitive to. [Mod. note: and so the question is: how would isolated primordial black holes produce X-rays? -- mjh] ------------------------------------------------------------------------------------------------ Accreting black holes will emit X-rays. Even isolated black holes will accrete interstellar gas and dust. Isolated black holes may be commonly found inside interstellar gas/ dust clouds, as are young stellar objects. There is published literature on all of these facts by professional astrophysicists in the ApJ. [Mod. note: everyone agrees on point 1; give references for points 2 and 3, please -- mjh] A major part of NuSTAR's mission is to learn about the abundance and distribution of black holes in our Galaxy. Robert L. Oldershaw http://www3.amherst.edu/~rloldershaw |
#22
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LHC: "WIMPs" Not Observed (6/4/12)
On 6/17/12 6:46 AM, Robert L. Oldershaw wrote:
Let's see the observational results, due in 1-6 months if all goes well, and then have an intelligent and objective discussion about their implications. RLO http://www3.amherst.edu/~rloldershaw In the context that Ackermann's presentation www-conf.slac.stanford.edu/tevpa09/Ackermann090714v2.ppt and particulary slide: SED of the isotropic diffuse emission (1 keV - 100 GeV) it can not be ruled out that NUSTAR X-Ray detection in the range (6 - 79 keV) or (.006 - .079 MeV) may contribute to further understanding of the isotropic diffuse emission. The previous error bars in this range do not appear substantial but could be further minimized. It would be nice to reduce the large error bars in the 1 - 100 MeV range previously observed by Comptel. Fermi isotropic emission continues analysis at higher energies. I assume that the observed isotropic diffuse emission is truly diffuse and not due to individual or grouped point sources. Richard D Saam |
#23
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LHC: "WIMPs" Not Observed (6/4/12)
On Monday, June 18, 2012 2:19:26 AM UTC-4, Richard D. Saam wrote:
On 6/17/12 6:46 AM, Robert L. Oldershaw wrote: Let's see the observational results, due in 1-6 months if all goes well, and then have an intelligent and objective discussion about their implications. ..... I assume that the observed isotropic diffuse emission is truly diffuse and not due to individual or grouped point sources. Actually, this is still a matter of some scientific debate. As better telescopes have become available, more and more of the "diffuse" X-ray emission has been resolved into individual point sources. NuSTAR will definitely play a role in resolving more of the cosmic hard X-ray background into point sources. But these point sources are still very luminous (10^40 - 10^49 erg/s). They are active galactic nuclei and not stellar mass black holes (primordial or otherwise), which because of the Eddington limit could never radiate at those luminosities. CM |
#24
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LHC: "WIMPs" Not Observed (6/4/12)
On Jun 18, 2:18*am, "Robert L. Oldershaw"
wrote: On Jun 17, 10:04 am, Phillip Helbig---undress to wrote: It is an X-ray telescope. It can observe anything which is sufficiently bright in the wavelengths it is sensitive to. [Mod. note: and so the question is: how would isolated primordial black holes produce X-rays? -- mjh] ---------------------------------------------------------------------------*--------------------- Accreting black holes will emit X-rays. Even isolated black holes will accrete interstellar gas and dust. Isolated black holes may be commonly found inside interstellar gas/ dust clouds, as are young stellar objects. There is published literature on all of these facts by professional astrophysicists in the ApJ. [Mod. note: everyone agrees on point 1; give references for points 2 and 3, please -- mjh] ------------------------------------------------------------------------------------------------------ Point 2: If you carefully read ApJ 322, 34-36, 1987, you will encounter a discussion of accretion of interstellar gas/dust onto black holes in the disk and halo of the Galaxy, and the expected X-ray output from this phenomena. Also, you will find quantitative predictions of the X-ray luminousity generated by the fundamental stellar-mass Kerr-Newman objects predicted by Discrete Scale Relativity to comprise the galactic dark matter. Point 3: There are a lot of interesting phenomena going on inside interstellar gas/dust clouds, including star system formation and sources with energetic jets. I do not know offhand of papers that report the presence of black holes in these gas/dust clouds, but if BHs are ubiquitous, or even just present at the conventionally assumed level, they will be found in interstellar gas/dust clouds. Why would they be excluded? NuSTAR will have a resolution that is a factor of 10 better than anything previous, and an improvement of sensitivity of a factor of 100. There is the reasonable hope that NuSTAR can properly canvas the galactic stellar-mass BH population for the first time in scientific history. Why the negativity? Maybe we should just let nature do the talking. Robert L. Oldershaw http://www3.amherst.edu/~rloldershaw Discrete Scale Relativity |
#25
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LHC: "WIMPs" Not Observed (6/4/12)
On Jun 18, 11:39*am, "Robert L. Oldershaw"
wrote: On Jun 18, 2:18 am, "Robert L. Oldershaw" wrote: On Jun 17, 10:04 am, Phillip Helbig---undress to wrote: It is an X-ray telescope. It can observe anything which is sufficiently bright in the wavelengths it is sensitive to. [Mod. note: and so the question is: how would isolated primordial black holes produce X-rays? -- mjh] ------------------------------------------------------------------------------------------------ Accreting black holes will emit X-rays. Even isolated black holes will accrete interstellar gas and dust. Isolated black holes may be commonly found inside interstellar gas/ dust clouds, as are young stellar objects. There is published literature on all of these facts by professional astrophysicists in the ApJ. [Mod. note: everyone agrees on point 1; give references for points 2 and 3, please -- mjh] ------------------------------------------------------------------------------------------------------ Point 2: If you carefully read ApJ 322, 34-36, 1987, you will encounter a discussion of accretion of interstellar gas/dust onto black holes in the disk and halo of the Galaxy, and the expected X-ray output from this phenomena. You will also encounter many falsified predictions. For example (from memory): electron substructure, x-ray luminosity of your compact objects, and every detail related to gravitational microlensing. I will note that you cite the same resources folks have been citing for 20+ years WRT microlensing but you still dismiss falsifications as shoddy science so it is a little bit hard to take your citations seriously. Also, you will find quantitative predictions of the X-ray luminousity generated by the fundamental stellar-mass Kerr-Newman objects predicted by Discrete Scale Relativity to comprise the galactic dark matter. Yeah, and they are wrong even through several generations of x-ray satellite observatories. Point 3: There are a lot of interesting phenomena going on inside interstellar gas/dust clouds, including star system formation and sources with energetic jets. True, but none that are relevant to your claims. I do not know offhand of papers that report the presence of black holes in these gas/dust clouds, That's because there are none. But it pleases me to see that you still refuse to do literature searches. but if BHs are ubiquitous, or even just present at the conventionally assumed level, they will be found in interstellar gas/dust clouds. *Why would they be excluded? Because they don't exist. Your own argument disproves your thesis because the required black hole density to explain dark matter would put a sizable bloc of them in star forming regions in which they will accrete and radiate. This is not seen, and you cannot name a single example that proves otherwise. Of course there's also the microlensing observations with also falsify the 'black hole as dark matter' theory rather soundly but that message does not appear to have made it to you. NuSTAR will have a resolution that is a factor of 10 better than anything previous, and an improvement of sensitivity of a factor of 100. *There is the reasonable hope that NuSTAR can properly canvas the galactic stellar-mass BH population for the first time in scientific history. I like your transition from primordial black holes to stellar mass black holes. It'd help your agenda if you were consistent. Nobody thinks, in 2012, that stellar mass black holes do not exist for that is a silly position to take. But on the flip side, nobody (except you, apparently) thinks that there is a credible volume of primordial black holes at this point in time. Further, stellar mass black holes have been conclusively eliminated as a dark matter candidate. Primordial black holes have _nearly_ been eliminated, and we've discussed this before. Apparently you forgot, or were simply not listening. Why the negativity? *Maybe we should just let nature do the talking. We'll stop being negative roughly around the time you stop disregarding evidence that does not agree with your belief system. Robert L. Oldershawhttp://www3.amherst.edu/~rloldershaw Discrete Scale Relativity |
#26
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LHC: "WIMPs" Not Observed (6/4/12)
On Monday, June 18, 2012 12:39:40 PM UTC-4, Robert L. Oldershaw wrote:
Point 2: If you carefully read ApJ 322, 34-36, 1987, you will encounter a discussion of accretion of interstellar gas/dust onto black holes in the disk and halo of the Galaxy, and the expected X-ray output from this phenomena. Also, you will find quantitative predictions of the X-ray luminousity generated by the fundamental stellar-mass Kerr-Newman objects predicted by Discrete Scale Relativity to comprise the galactic dark matter. Actually, none of what you *claim* is in the cited paper is actually *in* the paper. The paper you cite does not discuss accretion, gas nor dust; nor much really about black holes. It does claim the presence of 0.145 M_sun compact objects in the galaxy, with luminosities of 10^{29} erg/s, but only by reference to another paper in a journal that is now not commonly available to researchers. But let's evaluate the claim of compact objects having X-ray luminosities 10^{29} erg/s. Bodies of that luminosity within 2 kpc of the sun will emit fluxes of about 2e-16 erg/s/cm^2. NuSTAR would require 166 *YEARS* of integrated exposure to detect such a source. This conclusion is approximately independent of the spectral shape of the source: I tried Crab-like and thermal kT=5 keV. In other words, there is no way that NuSTAR will detect the claimed compact objects, even if they were a factor of 10 - 100 brighter. Furthermore, there have been plenty of surveys more sensitive than NuSTAR in different X-ray bands (Chandra, XMM-Newton, ASCA, etc). What is so special about NuSTAR that you would claim it would detect "primordial" black holes, without also consulting those other surveys? NuSTAR *will* detect a lot of accreting black holes in our galaxy and in external galaxies, but there's no evidence they will be primordial. Why the negativity? Maybe we should just let nature do the talking. Indeed. But you were the one who made an apparently unsubstantiated claim, presumably to pump up your own theory. Anybody can check the feasibility of detecting an X-ray emitting object with any of the X-ray observatories; just Google for WebPIMMS. Why didn't you do this before you made your claim? There is a difference being pessimistic and calling someone out on sloppy work. |
#27
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LHC: "WIMPs" Not Observed (6/4/12)
On Jun 19, 3:02*am, "
wrote: There is a difference being pessimistic and calling someone out on sloppy work. ------------------------------------------------------------------------------------ Thank you all for your kind and thoughtful comments. NuSTAR starts scientific observations in less than a month. There have been more negative "WIMP" results since 6/4/12, but what is the point of beating a dead horse? Robert L. Oldershaw http://www3.amherst.edu/~rloldershaw Discrete Scale Relativity Fractal Cosmology |
#29
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LHC: "WIMPs" Not Observed (6/4/12)
On Jun 19, 9:37*am, "Robert L. Oldershaw"
wrote: On Jun 19, 3:02 am, ...@gmail. com wrote: There is a difference being pessimistic and calling someone out on sloppy work. ------------------------------------------------------------------------------------ Thank you all for your kind and thoughtful comments. I note that you have not addressed any one of them. NuSTAR starts scientific observations in less than a month. Kepler has been producing data for awhile now. When are you going to look at it? How about the OGLE and various other microlensing collaborations? Do you have a value for the integrated x-ray background you would expect from your numerology? There have been more negative "WIMP" results since 6/4/12, but what is the point of beating a dead horse? Yes, what is the point? You have been told time and again that the WIMP theory of dark matter is one among several, whose existence or lack thereof does not impact the observations that require dark matter in any way shape or form. Your numerology does not become more attractive just because you post a few more times on USENET. Where are your peer reviewed publications on the subject? Robert L. Oldershawhttp://www3.amherst.edu/~rloldershaw Discrete Scale Relativity Fractal Cosmology |
#30
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LHC: "WIMPs" Not Observed (6/4/12)
On Tuesday, June 19, 2012 10:37:07 AM UTC-4, Robert L. Oldershaw wrote:
On Jun 19, 3:02*am, " wrote: There is a difference being pessimistic and calling someone out on sloppy work. ------------------------------------------------------------------------------------ Thank you all for your kind and thoughtful comments. NuSTAR starts scientific observations in less than a month. There have been more negative "WIMP" results since 6/4/12, but what is the point of beating a dead horse? What's up with the passive-aggressive behavior? You raised the claim, and continue to bring up additional information, so it's not clear who you think is beating dead horses. So are you still claiming that NuSTAR will detect "primordial" black holes? How exactly will NuSTAR detect objects with luminosity 10^{29} erg/s? (if that indeed is your claimed luminosity for these objects) Why didn't these objects show up in more sensitive surveys by other X-ray observatories like Chandra or XMM-Newton? CM |
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