2017MNRAS.468.4039R


Query : 2017MNRAS.468.4039R

2017MNRAS.468.4039R - Mon. Not. R. Astron. Soc., 468, 4039-4047 (2017/July-2)

Ultra-diffuse galaxies outside clusters: clues to their formation and evolution.

ROMAN J. and TRUJILLO I.

Abstract (from CDS):

We identify six ultra-diffuse galaxies (UDGs) outside clusters in three nearby isolated groups (0.014 < z < 0.026) using very deep imaging in three different Sloan Digital Sky Survey filters (g, r and i bands) from the IAC Stripe 82 Legacy Project. By comparing with the abundance of UDGs in rich galaxy clusters, we find that the density of UDGs (i.e. the number per unit mass of the host structure where they are located) decreases towards the most massive systems. This is compatible with a scenario where UDGs are formed preferentially outside clusters. In the periphery (D > 250 kpc) of our three groups, we identify a population of potential UDG progenitors (two of them confirmed spectroscopically). These progenitors have similar masses, shapes and sizes but are bluer, g - i ∼ 0.45 [and for this reason brighter, µg(0) < 24 mag arcsec–2] than traditional UDGs (g - i ∼ 0.76). Passive evolution of these progenitors will transform them into regular [i.e. µg(0) > 24 mag arcsec–2] UDGs after ∼6 Gyr. If confirmed, our observations support a scenario where UDGs are old, extended, low surface brightness dwarf galaxies (M* ∼ 108 M) born in the field, are later processed in groups and, ultimately, infall into galaxy clusters by group accretion.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation - galaxies: photometry - galaxies: structure - galaxies: structure

Nomenclature: Table 1, Fig. 1: [RT2017] UDG-BN (Nos B1-B5), [RT2017] UDG-RN (Nos R1-R6).

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [RT2017] UDG-B2 LSB 00 38 24 +01 06.4           ~ 2 0
2 [RT2017] UDG-R4 LSB 00 39 05 +01 05.9           ~ 1 0
3 HCG 7 CGG 00 39 15.9 +00 53 17   11.4       ~ 82 0
4 [RT2017] UDG-B4 LSB 00 39 33 +01 06.9           ~ 3 0
5 [RT2017] UDG-R3 LSB 00 39 38 +00 59.1           ~ 1 0
6 [RT2017] UDG-B5 LSB 00 39 53 +00 23.0           ~ 2 0
7 [RT2017] UDG-R1 LSB 00 39 54 +00 48.5           ~ 1 0
8 ACO 168 ClG 01 15 09.8 +00 14 51           ~ 336 2
9 NAME UGC 842 Group GrG 01 18.0 -01 00           ~ 9 1
10 [RT2017] UDG-B3 LSB 03 19 50 -00 51.3           ~ 2 0
11 [RT2017] UDG-B1 LSB 03 20 21 -01 10.2           ~ 3 0
12 HCG 25 CGG 03 20 43.7 -01 03 07     13.6     ~ 59 0
13 [RT2017] UDG-R2 LSB 03 20 47 -01 00.8           ~ 1 0
14 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1639 0
15 LEDA 41311 GiC 12 30 23.8 +13 58 56   20       ~ 56 0
16 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4399 2
17 SMDG J1300580+265835 LSB 13 00 58.0 +26 58 35           ~ 75 0
18 [RT2017] UDG-R6 LSB 23 53 59 +00 27.2           ~ 1 0
19 HCG 98 CGG 23 54 11.990 +00 22 20.17           ~ 38 0
20 [RT2017] UDG-R5 LSB 23 54 28 +00 19.3           ~ 1 0

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2021.10.27-04:49:17

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