2019MNRAS.483.4031W

Query : 2019MNRAS.483.4031W

2019MNRAS.483.4031W - Mon. Not. R. Astron. Soc., 483, 4031-4039 (2019/March-1)

The suppression of star formation on the smallest scales: what role does environment play?

WIMBERLY M.K.R., COOPER M.C., FILLINGHAM S.P., BOYLAN-KOLCHIN M., BULLOCK J.S. and GARRISON-KIMMEL S.

Abstract (from CDS):

The predominantly ancient stellar populations observed in the lowest mass galaxies (i.e. ultra-faint dwarfs) suggest that their star formation was suppressed by reionization. Most of the well-studied ultra-faint dwarfs, however, are within the central half of the Milky Way dark matter halo, such that they are consistent with a population that was accreted at early times and thus potentially quenched via environmental processes. To study the potential role of environment in suppressing star formation on the smallest scales, we utilize the Exploring the Local Volume in Simulations suite of N-body simulations to constrain the distribution of infall times for low-mass subhaloes likely to host the ultra-faint population. For the ultra-faint satellites of the Milky Way with star formation histories inferred from Hubble Space Telescope imaging, we find that environment is highly unlikely to play a dominant role in quenching their star formation. Even when including the potential effects of pre-processing, there is a ≲0.1 per cent probability that environmental processes quenched all of the known ultra-faint dwarfs early enough to explain their observed star formation histories. Instead, we argue for a mass floor in the effectiveness of satellite quenching at roughly M*∼105 M☉, below which star formation in surviving galaxies is globally suppressed by reionization. We predict a large population of quenched ultra-faint dwarfs in the Local Field (1 < R/Rvir < 2), with as many as ∼250 to be discovered by future wide-field imaging surveys.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation - galaxies: general - Local Group - galaxies: star formation

Simbad objects: 43

goto Full paper

goto View the references in ADS

Number of rows : 43
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 NAME Tuc IV G 00 02.9 -60 51           ~ 90 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
5 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
6 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
7 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
8 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
10 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
11 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
12 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
13 NAME Col I G 05 31.4 -28 02           ~ 60 0
14 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
15 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
16 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
17 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
18 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
19 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
20 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
21 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
22 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
23 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
24 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
25 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
26 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
27 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
28 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
29 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
30 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
31 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
32 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
33 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
34 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
35 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
36 NAME Gru II G 22 04.1 -46 26           ~ 110 0
37 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
38 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
39 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
40 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
41 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
42 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
43 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2019MNRAS.483.4031W and select 'bookmark this link' or equivalent in the popup menu