<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:large">I said</span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:large"><br></span></div><div class="gmail_default"><span style="font-family:arial,helvetica,sans-serif;font-size:large">"</span>until LIGO nobody had ever detected 2 Black Holes in orbit around each other<span style="font-family:arial,helvetica,sans-serif;font-size:large">"</span><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:large"><br></span></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" size="4">Now that I think about it that's not quite true, 4 or 5 were discovered by X rays but they were all of the supermassive type of billions of solar masses.</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" size="4"><br></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" size="4">John K Clark</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:large"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 4, 2017 at 1:24 PM, John Clark <span dir="ltr"><<a href="mailto:johnkclark@gmail.com" target="_blank">johnkclark@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span class=""><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif">On Tue, Oct 3, 2017 at 12:53 AM, spike </span><span dir="ltr" style="font-family:arial,sans-serif"><<a href="mailto:spike66@att.net" target="_blank">spike66@att.net</a>></span><span style="font-family:arial,sans-serif"> wrote:</span><br></div></span><div class="gmail_extra"><span class=""><div class="gmail_quote"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span style="font-size:12.8px">Consider any two black holes locked into mutual orbit. Always the smaller hole goes into a bigger orbit, so it travels faster and traverses more space. The pair attracts stuff, so gas and perhaps stars are devoured, but always the smaller black hole grows faster because of covering more ground: anything that falls inward toward the pair has a higher chance of being gobbled by the smaller black hole.</span></blockquote><div><br></div></span><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4">But there can't be much stuff falling into either Black Hole, if there were they'd be producing powerful X rays and they would have been seen years ago, but until LIGO nobody had ever detected 2 Black Holes in orbit around each other. That's really not surprising, those Black Holes are old and the dusty cloud that made the original stars (assuming those Black Holes came from stars) would be long gone by now. And if the Black Holes are primordial there would be even less reason to think they are now in a crowded part of the universe where lots of things can fall in.</font></div></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><br></div></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">Also if a Black Hole is much larger than about 100 solar masses the frequency of the </div><font face="arial, helvetica, sans-serif">gravitational </font></font><div class="gmail_default" style="font-size:large;font-family:arial,helvetica,sans-serif;display:inline">waves will be too low for LIGO to detect. </div></div><div><span style="font-size:large"><br></span></div><div><span style="font-size:large"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> John K Clark </div> </span></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5"><div lang="EN-US"><div class="m_5312190132542932553gmail-m_3682667994687277371WordSection1"><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I had an idea upon which John or the other astronomy hipsters might comment.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I noticed the masses of the merging black holes seemed to be remarkably even with each other, within a factor of 2:<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">First event, masses of 29 and 35<u></u><u></u></p><p class="MsoNormal">Second event, masses of 8 and 14<u></u><u></u></p><p class="MsoNormal">Third event, masses of 19 and 31<u></u><u></u></p><p class="MsoNormal">Fourth event, masses of 25 and 30<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Today a notion occurred to me: there is a reason why this might not be just a crazy coincidence or a characteristic of the LIGO instrument to detect only a certain class of mergers.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Consider any two black holes locked into mutual orbit. Always the smaller hole goes into a bigger orbit, so it travels faster and traverses more space. The pair attracts stuff, so gas and perhaps stars are devoured, but always the smaller black hole grows faster because of covering more ground: anything that falls inward toward the pair has a higher chance of being gobbled by the smaller black hole.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">This might explain why the four observations seen so far are mergers between black holes of almost the same mass.<span class="m_5312190132542932553gmail-HOEnZb"><font color="#888888"><u></u><u></u></font></span></p><span class="m_5312190132542932553gmail-HOEnZb"><font color="#888888"><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">spike<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p></font></span></div></div><br></div></div><span class="">______________________________<wbr>_________________<br>
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