2018ApJ...866L..11B

Query : 2018ApJ...866L..11B

2018ApJ...866L..11B - Astrophys. J., 866, L11-L11 (2018/October-2)

Evidence for ultra-diffuse galaxy "formation" through galaxy interactions.

BENNET P., SAND D.J., ZARITSKY D., CRNOJEVIC D., SPEKKENS K. and KARUNAKARAN A.

Abstract (from CDS):

We report the discovery of two ultra-diffuse galaxies (UDGs) that show clear evidence of an association with tidal material and an interaction with a larger galaxy halo, found during a search of the Wide portion of the Canada-France-Hawaii Telescope Legacy Survey. The two new UDGs, NGC 2708-Dw1 and NGC 5631-Dw1, are faint (Mg = -13.7 and -11.8 mag), extended (rh = 2.60 and 2.15 kpc), and have low central surface brightness (µ(g, 0) = 24.9 and 27.3 mag arcsec–2), while the stellar stream associated with each has a surface brightness µ(g) >= 28.2 mag arcsec–2. These observations provide evidence that the origin of some UDGs may connect to galaxy interactions, either by transforming normal dwarf galaxies by expanding them, or because UDGs can collapse out of tidal material (i.e., they are tidal dwarf galaxies). Further work is needed to understand the fraction of the UDG population "formed" through galaxy interactions, and wide field searches for diffuse dwarf galaxies will provide further clues to the origin of these enigmatic stellar systems.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

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

Nomenclature: Table 1: [BSZ2018] NGC 2708-Dw1 and [BSZ2018] NGC 5631-Dw1.

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
3 NAME NGC 253-dw2 G 00 50 17.060 -24 44 58.58           ~ 21 0
4 LEDA 3097693 LSB 02 41 46.80 -08 24 09.3     16.2   15.8 ~ 183 0
5 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1448 3
6 NGC 2698 GiG 08 55 36.4948914048 -03 11 02.378344776   13.2       ~ 65 0
7 NGC 2708 Sy2 08 56 08.0718678384 -03 21 36.487371348   12.6   12.5 11.9 ~ 102 1
8 MATLAS-437 LSB 08 56 12.8 -03 25 17           ~ 7 0
9 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1126 1
10 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
11 [CSC2014] CenA-MM-Dw3 G 13 30 21.0 -42 11 33           ~ 20 0
12 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
13 [BSZ2018] NGC 5631-Dw1 LSB 14 26 13.60 +56 31 50.2           ~ 6 0
14 NGC 5631 Sy2 14 26 33.2913328320 +56 34 57.424681848   13.51 12.55     ~ 204 0
15 NGC 5667 GiG 14 30 22.888 +59 28 10.84   13.1       ~ 74 0
16 NGC 5678 SyG 14 32 05.5700264952 +57 55 17.155392060   12.10       ~ 240 1

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