2019MNRAS.490.1186G

Query : 2019MNRAS.490.1186G

2019MNRAS.490.1186G - Mon. Not. R. Astron. Soc., 490, 1186-1201 (2019/November-3)

A predicted correlation between age gradient and star formation history in FIRE dwarf galaxies.

GRAUS A.S., BULLOCK J.S., FITTS A., COOPER M.C., BOYLAN-KOLCHIN M., WEISZ D.R., WETZEL A., FELDMANN R., FAUCHER-GIGUERE C.-A., QUATAERT E., HOPKINS P.F. and KERES D.

Abstract (from CDS):

We explore the radial variation of star formation histories (SFHs) in dwarf galaxies simulated with Feedback In Realistic Environments (FIRE) physics. The sample contains 26 field dwarf galaxies with Mstar = 105-109 M☉. We find age gradients are common in our dwarfs, with older stars dominant at large radii. The strength of the gradient correlates with overall galaxy age such that earlier star formation produces a more pronounced gradient. The relation between formation time and strength of the gradient is driven by both mergers and star formation feedback. Mergers can both steepen and flatten the age gradient depending on the timing of the merger and SFHs of the merging galaxy. In galaxies without significant mergers, feedback pushes stars to the outskirts. The strength of the age gradient is determined by the subsequent evolution of the galaxy. Galaxies with weak age gradients constantly grow to z = 0, meaning that young star formation occurs at a similar radius to which older stars are heated to. In contrast, galaxies with strong age gradients tend to maintain a constant half-mass radius over time. If real galaxies have age gradients as we predict, stellar population studies that rely on sampling a limited fraction of a galaxy can give a biased view of its global SFH. Central fields can be biased young by Gyrs while outer fields are biased old. Fields positioned near the 2D half-light radius will provide the least biased measure of a dwarf galaxy's global SFH.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: formation - Local Group - cosmology: theory

Simbad objects: 43

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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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
4 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
5 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
6 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
7 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
8 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
9 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
10 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
11 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
12 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
13 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
14 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
15 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
16 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
17 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
18 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
19 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
20 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
21 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
22 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
23 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
24 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
25 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
27 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
28 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
29 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
30 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
31 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
32 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
33 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
34 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
35 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
36 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
37 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
38 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
39 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
40 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
41 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
42 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
43 NAME Local Group GrG ~ ~           ~ 9325 0

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