[Astro] [CAPT] Seminar 21/5 Wednesday @C4 -- 15:45 with Sugata Kaviraj (Hertfordshire)

[Jesse Golden-Marx]

Hi Everyone,

Our seminar this week will be given by Prof. Sugata Kaviraj (Hertfordshire), details below. The seminar will be in C4.

Post-seminar refreshments will be wine and cheese.

Sugata will be arriving by 13:00.

Timings are as usual:

- lunch at Lakeside, leaving CAPT ~13:00 (subsidized for a limited number of students -- let me know before the end of the day tomorrow)
- meet the speaker for postgrads at 15:00, finishing at 15:30
- seminar at 15:45 in C4
- post-seminar wine and cheese at 16:45

This seminar will be conducted in person only.

Best,
Jesse and Luke


Title: Dwarf galaxies in deep-wide surveys: a new frontier in the study of galaxy evolution

Abstract:
Dwarf (M < 10^9.5 MSun) galaxies dominate the galaxy number density, making them critical to a complete understanding of galaxy evolution. However, typical dwarfs are not bright enough to be detectable, outside the very local Universe, in past large surveys like the SDSS, because they are too shallow. The dwarfs that do exist in such surveys have extreme star formation rates, which makes them anomalously blue and unrepresentative of dwarfs in general. New deep-wide surveys from the Hyper Suprime-Cam (HSC), LSST and Euclid will revolutionise our understanding of galaxy evolution, by offering unbiased statistical samples of dwarfs out to at least z∼0.4. We demonstrate the game-changing potential of such surveys, by exploring four key aspects of galaxy evolution in the dwarf regime (10^8 MSun < M < 10^9.5 MSun), using several thousand dwarfs in the HSC U/deep footprint in COSMOS: star formation, quenching, morphologies and AGN activity.

The fraction of red/quenched dwarfs in HSC U/Deep is around 40%, a factor of 8 higher than what is concluded using the SDSS. Red dwarfs reside in higher-density environments and closer to nodes, large-scale filaments and massive galaxies. However, the probability of dwarfs being red is most strongly correlated with the distance to the nearest massive galaxy. Dwarfs show three principal morphological types: early-type, late-type and a featureless class which lacks both the central concentrations found in early-types or any spiral structure. Dwarf early-types, unlike their massive counterparts, are likely to be shaped by secular processes (not interactions), while the featureless dwarfs are likely created by baryonic feedback. Finally, broadband variability studies (which will become a key tool for AGN detection in the LSST era) suggest that the incidence of AGN in dwarfs and massive galaxies may be similar, suggesting that AGN could be important in the dwarf regime, as they are in massive galaxies. Dwarfs represent a vast discovery space for new and future deep-wide surveys like Euclid and LSST which promises new insights into how galaxies form and evolve over cosmic time.






Jesse Golden-Marx, Ph.D.
Senior Research Associate

Centre for Astronomy & Particle Theory
School of Physics & Astronomy
University of Nottingham
University Park, Nottingham, UK
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