Suspected Medium-Sized Black Hole in Omega Centauri


	Suspected Medium-Sized Black Hole in Omega Centauri

Rustee

4-5-2008 12:14 AM

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tags:

astronomy, science

Rustee says:

Although the presence of an intermediate-mass black hole is the most likely reason for the stellar speedway near the cluster’s center, the astronomers said they have not ruled out a couple of other possible causes.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/9e4e4a12-fecb-4ab3-8e28-cd6ebc22c857/BD0F2688-AB6A-48E7-91F1-D48780C36E22/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.randybrewer.net/images/FCT150-Images/OmegaCentari-Large.jpg" href="http://www.randybrewer.net/images/FCT150-Images/OmegaCentari-Large.jpg" style="font-size: 11px;">www.randybrewer.net</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.randybrewer.net/images/FCT150-Images/OmegaCentari-Large.jpg"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.randybrewer.net/img/AB626467-A2A7-4636-BA78-DDFF214D2DC6" alt="The image “http://www.randybrewer.net/images/FCT150-Images/OmegaCentari-Large.jpg” cannot be displayed, because it contains errors." /></div></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content7.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://mcdonaldobservatory.org/news/releases/2008/0402.html" href="http://mcdonaldobservatory.org/news/releases/2008/0402.html" style="font-size: 11px;">mcdonaldobservatory.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mcdonaldobservatory.org/news/releases/2008/0402.html">A well-known star cluster that glitters with the light of millions of stars may have a mysterious dark object tugging at its core, according to researchers at The University of Texas at Austin.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mcdonaldobservatory.org/news/releases/2008/0402.html"><P>Astronomer Karl Gebhardt has teamed up with recent Ph.D. graduate Eva Noyola to find evidence for a medium-size black hole at the core of Omega Centauri, one of the largest and most massive globular star clusters orbiting the Milky Way galaxy. The finding will appear in the April 10 issue of <EM>The Astrophysical Journal</EM>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mcdonaldobservatory.org/news/releases/2008/0402.html"><P>The black hole in Omega Centauri is estimated to be about 40,000 times the mass of the Sun, falling in between the masses of supermassive black holes at the hearts of galaxies like the Milky Way and stellar-mass black holes that result when the most massive stars explode as supernovae. </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mcdonaldobservatory.org/news/releases/2008/0402.html">Measuring the speed of the stars swirling near the cluster’s center with the Gemini Observatory, the astronomers found that the stars closer to the core are moving faster than the stars farther away. </blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/BD0F2688-AB6A-48E7-91F1-D48780C36E22/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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