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Just a reminder of today's lunch talk at 1 PM!</div>
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Rhys</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Astro <astro-bounces@lists.nottingham.ac.uk> on behalf of Rhys Jordan <rhys.jordan@nottingham.ac.uk><br>
<b>Sent:</b> 02 March 2026 11:14<br>
<b>To:</b> astro@nottingham.ac.uk <astro@nottingham.ac.uk><br>
<b>Subject:</b> [Astro] Lunch Talk - 05/03/2026</font>
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<span style="font-size:14px">Hi all,</span><span style="font-size:12pt"> </span></div>
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This week’s lunch talk will be given by Adela Fernandez on Thursday, the 5th of March, at 1 PM in A113. Title and abstract below.</div>
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<span style="color:black"><b>Title: </b></span><span style="color:rgb(0,0,0)">Can intracluster light trace the shape of dark matter haloes?</span></div>
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<b>Abstract:</b></div>
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We investigate whether the intracluster light (ICL) can be used as a tracer of the shape of the dark matter (DM) haloes in galaxy clusters. Establishing such a link would provide a new way to probe the shapes of DM directly from deep imaging, to ultimately
help us better understand its nature. Using the Hydrangea simulations, we measure the three-dimensional and projected shapes of the ICL and DM concentric ellipsoidal shells using the shape tensor method. We find that the ICL and DM position angles are closely
aligned, with major-axis misalignments below 10 degrees, and very similar axis ratios, though the DM is slightly rounder on average. We show that the satellite distribution is a less reliable tracer than the ICL, with large misalignment angles and a bias toward
more elliptical shapes. These results indicate that the ICL can serve as a useful proxy for the ellipticity and orientation of DM haloes.</div>
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Thanks,</div>
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Rhys</div>
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