Booming sound waves heat up galaxy cluster


	Booming sound waves heat up galaxy cluster

Octane

5-27-2007 2:50 AM

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tags:

sound, galaxy, astronomy, science, physics

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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://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/0db4dcb7-809e-4ce1-91ee-66913bd1988a/BCBE03EA-3DB9-42DE-84BC-60A1AF2F802F/" 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://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20" href="http://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20" style="font-size: 11px;">space.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20"><H2 class="inline">Booming sound waves heat up galaxy cluster</H2></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://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20"><P>Enormous sound waves seen rippling through a galaxy cluster are heating up its gas, new observations suggest. This may solve a longstanding puzzle about why such clusters refuse to cool down.</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://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20"><P>Astronomers discovered in the 1970s that the vast reservoirs of gas located in galaxy clusters – massive groupings of hundreds or thousands of galaxies – glow brightly in x-rays. This suggested that the gas should be cooling and contracting as it radiates its energy away. But in 2001, new observations failed to find the expected pools of cool gas, puzzling astronomers.</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://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20">One possible explanation for the heating came in 2003, when the Chandra X-ray Observatory saw enormous ripples – spanning many thousands of light years across – in the gas inside the nearby Perseus galaxy cluster.</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://space.newscientist.com/article.ns?id=dn11900&feedId=space_rss20"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/space.newscientist.com/img/8988C277-E90B-4FD2-B8E8-F1EF2B77CA52" alt="Sound waves ripple through a galaxy cluster in this image from the Chandra X-ray Observatory. Bright x-rays from the gas near the centre has been filtered out to make the ripples more visible (Image: J Sanders/A Fabian/U Cambridge/Chandra)" /></div></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/BCBE03EA-3DB9-42DE-84BC-60A1AF2F802F/blog/" title="blog or email this clip"><img src="http://content6.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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