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20 April 2024 |
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Investigating Clumpy Galaxies in SDSS Stripe82 using Galaxy Zoo | | Vihang Mehta
; Claudia Scarlata
; Lucy Fortson
; Hugh Dickinson
; Dominic Adams
; Jacopo Chevallard
; Stéphane Charlot
; Melanie Beck
; Sandor Kruk
; Brooke Simmons
; | | Date: |
2 Nov 2020 | | Abstract: | Giant, star-forming clumps are a common feature prevalent amongst
high-redshift star-forming galaxies and play a critical role in shaping their
chaotic morphologies and yet, their nature and role in galaxy evolution remains
to be fully understood. A majority of the effort to study clumps has been
focused at high redshifts, and local clump studies have often suffered from
small sample sizes. In this work, we present an analysis of clump properties in
the local universe; for the first time, performed with a statistically
significant sample. With the help of the citizen science-powered Galaxy Zoo:
Hubble project, we select a sample of 92 $z<0.06$ clumpy galaxies in SDSS
Stripe82 galaxies. Within this sample, we identify 543 clumps using a
contrast-based image analysis algorithm and perform photometry as well as
estimate their stellar population properties. The overall properties of our
$z<0.06$ clump sample are comparable to the high-redshift clumps. However,
contrary to the high-redshift studies, we find no evidence of a gradient in
clump ages or masses as a function of their galactocentric distances, ruling
out the inward migration scenario for clump evolution for the local universe. | | Source: | arXiv, 2011.01232 | | Services: | Forum | Review | PDF | Favorites | |
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