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Hi Everyone,</div>
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I just wanted to remind you all about Ilin's seminar in ~ 1 hour in C4. See you all there!</div>
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Cheers,</div>
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Jesse</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jesse Golden-Marx (staff)<br>
<b>Sent:</b> Tuesday, January 13, 2026 10:07 AM<br>
<b>To:</b> Nottingham Astro Group <astro@nottingham.ac.uk><br>
<b>Cc:</b> Garreth Martin (staff) <Garreth.Martin@nottingham.ac.uk><br>
<b>Subject:</b> Seminar this week: Ilin Lazar</font>
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Hi Everyone,</div>
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I hope that you all had a wonderful vacation and enjoyed the holidays! We're starting up our spring seminar series this week (we'll send an announcement with all the speakers soon) with Ilin Lazar visiting us from Hertfordshire. As usual, the talk will
be in C4 at 15:45 followed by wine and cheese. </div>
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Ilin will be arriving around 12:00 tomorrow and be sitting in A110. If you're interested in joining for lunch at 13:00, please let Garreth know. As always, we can sponsor a few postgraduates to join. The title and abstract for Ilin's talk are given below. </div>
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A summary of the events for tomorrow is:</div>
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13:00 — Lunch with the seminar speaker</div>
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15:00 — Meeting with the postgraduates in A113</div>
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15:45 — Seminar in C4</div>
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16:45 — Wine and Cheese </div>
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See you all at the seminar tomorrow.</div>
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Cheers,</div>
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Jesse</div>
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<span style="font-family:Calibri,sans-serif; font-size:11pt; color:black">Title: Dwarf galaxies in deep-wide surveys: a new frontier in the study of galaxy evolution</span></p>
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<span style="font-family:Calibri,sans-serif; font-size:11pt; color:black">Abstract: </span></p>
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<span style="font-family:Calibri,sans-serif; font-size:11pt; color:black; background-color:white">Dwarf galaxies dominate the galaxy number density at all epochs and all environments, making them critical to our understanding</span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black"> </span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black; background-color:white">of
galaxy evolution. However, typical dwarfs are too faint to be visible outside the very local</span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black"> </span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black; background-color:white">Universe
in past surveys like the SDSS, which offer large footprints but are relatively shallow. In this study I use data from Ultra Deep layer (i<27.5 mag) of Hyper Suprime-Cam (which is around 10 magnitudes deeper than the SDSS spectroscopic sample) to present results
on: (1) the morphological mix of the dwarf population in the nearby Universe, (2) the dwarf stellar mass function across different environments with a focus on the missing dwarf problem and (3) the galaxy red fraction and the validity of the “downsizing” phenomenon
in the dwarf regime. Our dwarf samples are formed of dwarfs (M</span><span style="font-family:"Cambria Math",serif,serif,EmojiFont; font-size:11pt; color:black; background-color:white">⋆</span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black; background-color:white"> <
10^9.5 MSun) in the COSMOS and XMM-LSS fields reaching redshifts of z=0.4 and lower stellar mass limits of 10^7 MSun. We find that ~45 and ~45 per cent of dwarfs exhibit the traditional 'early-type' (elliptical/S0) and 'late-type' (spiral) morphologies, respectively.
However, 10 per cent populate a 'featureless' class, that lacks both the central light concentration seen in early-types and any spiral structure - this class is missing in the massive-galaxy regime. Compared to their massive counterparts, dwarf early-types
show a much lower incidence of interactions and are significantly less concentrated. This suggests that the formation histories of dwarf and massive early-types are different, with dwarf early-types being shaped less by interactions and more by secular processes.
In addition, we find that it is challenging to cleanly separate early and late-type dwarfs using traditional morphological parameters such as ‘CAS’, M20 and the Gini coefficient (unlike in the massive galaxy regime). We find no evidence of a generic missing
dwarf problem when all environments are considered (and not just satellites of Milky Way like galaxies). Finally, “downsizing” does not continue uninterrupted into the dwarf regime and the galaxy red fraction starts increasing again from M</span><span style="font-family:"Cambria Math",serif,serif,EmojiFont; font-size:11pt; color:black; background-color:white">⋆</span><span style="font-family:Calibri,sans-serif; font-size:11pt; color:black; background-color:white"> =
10^8.5 MSun towards lower stellar masses. I will end with presenting future prospects/plans for dwarf galaxy evolution studies in the era of Euclid and LSST. </span></p>
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<b>Jesse Golden-Marx, Ph.D.</b></div>
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<b>Senior Research Associate</b></div>
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Centre for Astronomy & Particle Theory</div>
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School of Physics & Astronomy</div>
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University of Nottingham</div>
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University Park, Nottingham, UK</div>
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