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         title="Permalink to Miquel Requena-Torres: Opening again the debate: the transient nature of the circumnuclear disk">Miquel Requena-Torres: Opening again the debate: the transient nature of the circumnuclear disk</a></h2>
 
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    <abbr class="published" title="2013-09-30T16:30:00-06:00">
      2013/09/30
    </abbr>
    <address class="vcard author">
      By <a class="url fn" href="https://keflavich.github.io/blog/author/adam-ginsburg.html">Adam Ginsburg</a>
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<dl class="docutils">
<dt>Data from many sources</dt>
<dd><ul class="first last simple">
<li>IRAM, APEX, Herschel</li>
<li>SOFIA now: FORCAST &amp; GREAT</li>
</ul>
</dd>
<dt>CO SED</dt>
<dd><ul class="first last simple">
<li>Measure up to CO 21-20</li>
<li>Model with LVG</li>
<li>Needs multiple components<ul>
<li>but no high-density components</li>
</ul>
</li>
</ul>
</dd>
<dt>HNC/HCO+</dt>
<dd><ul class="first last simple">
<li>Mills et al, 2013... on arxiv tomorrow</li>
<li>Vibrationally excited H3CN</li>
<li>RADEX -&gt; n~10^5.3-6.5</li>
<li>most of CND not tidally stable</li>
<li>High temperatures (120-150K) required to excite vibrationally excited gas</li>
</ul>
</dd>
<dt>Many works indicate CND not stable</dt>
<dd><ul class="first last simple">
<li>[Lacy indicated: doesn't need to be gravitationally stable; is formed by shear]</li>
<li>Betsy proposing HCN ladder with ALMA</li>
</ul>
</dd>
</dl>
<div class="section" id="questions">
<h2>Questions</h2>
<blockquote>
<ul class="simple">
<li>Q: If densities below Roche densities, maybe clumps are not virialized but
they contain virialized cores.</li>
<li>A: In very close...</li>
<li>Q: Model - black hole compresses clumps when they get closer to BH</li>
</ul>
</blockquote>
</div>

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