Cool Comparison!, Supermassive Black Hole Has No Galaxy |
Cool Comparison!, Supermassive Black Hole Has No Galaxy |
Sep 16 2005, 12:11 AM
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
HST and VLT
Black Hole in Search of a Home -- Astronomers Discover Bright Quasar Without Massive Host Galaxy ! http://spacetelescope.org/news/html/heic0511.html (Hubble site) http://www.eso.org/outreach/press-rel/pr-2005/pr-23-05.html (VLT site) Here's my comparison (true to scale) between the studied (orphaned) quasar and our milky way galaxy. Milky way is seen in the quasar distance of about 3.2 billion light years. Separation: 'Quasar' to 'Galaxy' center = sun to milky way center = lower than 30,000 light years My yesterdays work: -------------------- - blue_scape / Nico -
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Sep 16 2005, 05:46 AM
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#2
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Amazing comparison, SigurRosFan!
-------------------- I always think before posting! - Marco -
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Sep 16 2005, 01:10 PM
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#3
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
Thanks a lot, dilo.
-------------------- - blue_scape / Nico -
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Sep 16 2005, 05:13 PM
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#4
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Member Group: Members Posts: 249 Joined: 11-June 05 From: Finland (62°14′N 25°44′E) Member No.: 408 |
I didn't know we have such a good image of a quasar host galaxy as the photo of HE1239-2426 is. Hubble's ACS camera is superb!
-------------------- The universe is not only stranger than we imagine, it is stranger than we can imagine.
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Sep 16 2005, 05:22 PM
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#5
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
More information:
http://fr.arxiv.org/ftp/astro-ph/papers/0509/0509433.pdf (Astro-Ph PDF) predicted black hole mass: 800 million solar masses -------------------- - blue_scape / Nico -
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Dec 6 2005, 08:37 PM
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#6
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
Paper: astro-ph/0512123
Date: Mon, 5 Dec 2005 20:41:27 GMT (913kb) Title: The Role of Primordial Kicks on Black Hole Merger Rates Authors: Miroslav Micic, Tom Abel and Steinn Sigurdsson Comments: 12 pages, 9 figures, submitted to MNRAS Journal-ref: proceedings of 22nd Texas Symposium on Relativistic Astrophysics, Stanford University, December 13-17, 2004 \\ Primordial stars are likely to be very massive $\geq30\Msun$, form in isolation, and will likely leave black holes as remnants in the centers of their host dark matter halos in the mass range $10^{6}-10^{10}\Ms$. Such early black holes, at redshifts z$\gtsim10$, could be the seed black holes for the many supermassive black holes found in galaxies in the local universe. If they exist, their mergers with nearby supermassive black holes may be a prime signal for long wavelength gravitational wave detectors. We simulate formation of black holes in the center of high redshift dark matter halos and explore implications of initial natal kick velocities conjectured by some formation models. The central concentration of early black holes in present day galaxies is reduced if they are born even with moderate kicks of tens of km/s. The modest kicks allow the black holes to leave their parent halo, which consequently leads to dynamical friction being less effective on the lower mass black holes as compared to those still embedded in their parent halos. Therefore, merger rates may be reduced by more than an order of magnitude. Using analytical and illustrative cosmological N--body simulations we quantify the role of natal kicks of black holes formed from massive metal free stars on their merger rates with supermassive black holes in present day galaxies. Our results also apply to black holes ejected by the gravitational slingshot mechanism. \\ ( http://arXiv.org/abs/astro-ph/0512123 , 913kb) -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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