2017MNRAS.470.4231R

Query : 2017MNRAS.470.4231R

2017MNRAS.470.4231R - Mon. Not. R. Astron. Soc., 470, 4231-4240 (2017/October-1)

A Universe of ultradiffuse galaxies: theoretical predictions from ΛCDM simulations.

RONG Y., GUO Q., GAO L., LIAO S., XIE L., PUZIA T.H., SUN S. and PAN J.

Abstract (from CDS):

A particular population of galaxies have drawn much interest recently, which are as faint as typical dwarf galaxies but have the sizes as large as L* galaxies, the so called ultradiffuse galaxies (UDGs). The lack of tidal features of UDGs in dense environments suggests that their host haloes are perhaps as massive as that of the Milky Way. On the other hand, galaxy formation efficiency should be much higher in the haloes of such masses. Here, we use the model galaxy catalogue generated by populating two large simulations: the Millennium-II cosmological simulation and Phoenix simulations of nine big clusters with the semi-analytic galaxy formation model. This model reproduces remarkably well the observed properties of UDGs in the nearby clusters, including the abundance, profile, colour and morphology, etc. We search for UDG candidates using the public data and find two UDG candidates in our Local Group and 23 in our Local Volume, in excellent agreement with the model predictions. We demonstrate that UDGs are genuine dwarf galaxies, formed in the haloes of ∼1010 M☉. It is the combination of the late formation time and high spins of the host haloes that results in the spatially extended feature of this particular population. The lack of tidal disruption features of UDGs in clusters can also be explained by their late infall-time.

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

Journal keyword(s): methods: numerical - galaxies: evolution - galaxies: stellar content - galaxies: stellar content

Simbad objects: 34

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Number of rows : 34
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
3 IC 1574 AG? 00 43 03.82 -22 14 48.8 15.25 14.73 14.35 14.24 14.2 ~ 137 1
4 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
5 LEDA 2807107 G 02 27 26.9 +57 29 17   17.8       ~ 23 0
6 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
7 ESO 115-21 G 02 37 49.563 -61 19 53.77 14.14 13.52 13.13 12.95   ~ 100 1
8 MCG+00-07-077 EmG 02 40 23.09 +01 13 45.3   16.1   15.6 16.0 ~ 67 0
9 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
10 LEDA 166077 LSB 03 45 13.7 +67 51 58           ~ 37 0
11 NAME Camel Galaxy LSB 04 25 16.6 +72 48 24   14.85       ~ 59 0
12 IRAS C05368-0623 * 05 39 19.7 -06 22 09           ~ 2 0
13 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
14 NAME F12D1 G 09 50 10.0 +67 30 24   15.6       ~ 58 1
15 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
16 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
17 NAME IKN G 10 08 05.9 +68 23 57           ~ 82 0
18 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
19 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
20 [HKK2009] dJ1228+4358 LSB 12 28 44.9 +43 58 18           ~ 12 0
21 LEDA 41311 LSB 12 30 23.8 +13 58 56   20       ~ 83 0
22 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
23 IC 3687 GiG 12 42 15.1540831512 +38 30 05.844632940   15.5       ~ 153 0
24 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
25 SMDG J1300580+265835 LSB 13 00 57.996 +26 58 34.72     19.37 18.43   ~ 145 0
26 SMDG J1301582+275012 LSB 13 01 58.205 +27 50 11.91     19.89 19.45   ~ 61 0
27 ESO 269-58 AG? 13 10 32.8047 -46 59 37.747   12.50   11.31   ~ 76 0
28 Z 245-38 AG? 13 15 29.753 +47 29 58.69   15.6       ~ 114 1
29 [CSC2014] CenA-MM-Dw1 G 13 30 14.0 -41 53 36           ~ 17 0
30 [CSC2014] CenA-MM-Dw3 G 13 30 21.0 -42 11 33           ~ 20 0
31 LEDA 166170 G 13 36 36.0 -29 34 15   14.3       ~ 55 0
32 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
33 MCG-05-56-001 G 23 43 45.549 -31 57 24.37 14.55 14.03 13.73 13.63   ~ 162 1
34 NAME Local Group GrG ~ ~           ~ 9325 0

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