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Shadows in the Dark - K Romer.pdf (5.68 MB)

Shadows in the dark: low-surface-brightness galaxies discovered in the Dark Energy Survey

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journal contribution
posted on 2023-06-10, 00:47 authored by D Tanoglidis, A Drlica-Wagner, K Wei, T S Li, J Sánchez, Y Zhang, A H G Peter, A Feldmeier-Krause, J Prat, K Casey, A Palmese, C Sánchez, J DeRose, Sunayana Bhargava, Kathy RomerKathy Romer, DES Collaboration, others
We present a catalog of 23,790 extended low-surface-brightness galaxies (LSBGs) identified in ~5000 deg2 from the first three years of imaging data from the Dark Energy Survey (DES). Based on a single-component Sérsic model fit, we define extended LSBGs as galaxies with g-band effective radii Reff (g) > 2."5 and mean surface brightness µmeff (g )> 24.2 mag arcsec-2. We find that the distribution of LSBGs is strongly bimodal in (g-r) versus (g-i) color space. We divide our sample into red (g-i=0.60) and blue (g-i<0.60) galaxies and study the properties of the two populations. Redder LSBGs are more clustered than their blue counterparts and are correlated with the distribution of nearby (z<0.10) bright galaxies. Red LSBGs constitute ~33% of our LSBG sample, and ~30% of these are located within 1° of low-redshift galaxy groups and clusters (compared to ~8% of the blue LSBGs). For nine of the most prominent galaxy groups and clusters, we calculate the physical properties of associated LSBGs assuming a redshift derived from the host system. In these systems, we identify 41 objects that can be classified as ultradiffuse galaxies, defined as LSBGs with projected physical effective radii Reff > 1.5 kpc and central surface brightness µ0 (g )> 24.0 mag arcsec-2. The wide-area sample of LSBGs in DES can be used to test the role of environment on models of LSBG formation and evolution.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Astrophysical Journal, Supplement Series

ISSN

0067-0049

Publisher

IOP Publishing

Issue

2

Volume

252

Article number

a18

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-08-31

First Open Access (FOA) Date

2022-01-26

First Compliant Deposit (FCD) Date

2021-08-27

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