2016ApJ...818..179L


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET15:18:03

2016ApJ...818..179L - Astrophys. J., 818, 179 (2016/February-3)

Evidence for the rapid formation of low-mass early-type galaxies in dense environments.

LIU Y., PENG E.W., BLAKESLEE J., COTE P., FERRARESE L., JORDAN A., PUZIA T.H., TOLOBA E. and ZHANG H.-X.

Abstract (from CDS):

We explore the environmental dependence of star formation timescales in low-mass galaxies using the [α/Fe] abundance ratio as an evolutionary clock. We present integrated [α/Fe] measurements for 11 low-mass (M* ∼ 109M) early-type galaxies (ETGs) with a large range of cluster-centric distance in the Virgo Cluster. We find a gradient in [α/Fe], where the galaxies closest to the cluster center (the cD galaxy, M87) have the highest values. This trend is driven by galaxies within a projected radius of 0.4 Mpc (0.26 times the virial radius of Virgo A), all of which have super-solar [α/Fe]. Galaxies in this mass range exhibit a large scatter in the [α/Fe]-σ diagram, and do not obviously lie on an extension of the relation defined by massive ETGs. In addition, we find a correlation between [α/Fe] and globular cluster specific frequency (SN), suggesting that low-mass ETGs that formed their stars over a short period of time were also efficient at forming massive star clusters. The innermost low-mass ETGs in our sample have [α/Fe] values comparable to that of M87, implying that environment is the controlling factor for star formation timescales in dense regions. These low-mass galaxies could be the surviving counterparts of the objects that have already been accreted into the halo of M87, and may be the link between present-day low-mass galaxies and the old, metal-poor, high-[α/Fe], high-SN stellar populations seen in the outer halos of massive ETGs.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: clusters: individual: Virgo - galaxies: dwarf - galaxies: formation - galaxies: star clusters: general

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 655 2
2 IC 3032 GiG 12 11 07.764 +14 16 30.17   15.3       ~ 70 0
3 IC 3101 LSB 12 17 19.666 +11 56 36.96   15.5       ~ 62 0
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5696 0
5 IC 3381 LSB 12 28 14.854 +11 47 23.69   14.42       ~ 138 1
6 GRDG +12 52 GiC 12 29 23.5153719439 +12 27 02.898413946   16 15.29   14.16 ~ 83 0
7 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 373 0
8 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6077 3
9 UGC 7658 GiG 12 30 57.730 +12 16 13.30   11.2       ~ 206 0
10 IC 3442 GiG 12 31 20.1847539251 +14 06 54.716926859   15.4       ~ 89 0
11 IC 3461 GiG 12 32 02.747 +11 53 23.16   15.4 14.88   13.3 ~ 115 0
12 IC 3501 GiG 12 33 51.606 +13 19 21.35   15.0       ~ 85 0
13 IC 3506 GiC 12 34 06.739 +12 44 29.75   16.67 15.93   14.1 ~ 80 0
14 IC 3509 GiG 12 34 11.565 +12 02 55.89   15.3       ~ 96 0
15 IC 3586 GiG 12 36 54.858 +12 31 12.49   15.3       ~ 80 0
16 UGC 7854 G 12 41 51.987 +09 24 10.20   15.3       ~ 67 0
17 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4129 2
18 * 55 Vir PM* 13 14 10.8958308888 -19 55 51.410166108   6.20 5.33     G7IV 110 0
19 HD 134439 PM* 15 10 13.0874231858 -16 22 45.866399625 10.03 9.837 9.066 8.604 8.160 sd:K1Fe-1 298 0
20 * h Her PM* 16 32 36.2919015 +11 29 16.947932 8.16 6.34 4.85 3.65 2.79 K4.5III 141 0
21 * mu. Aql PM* 19 34 05.3535328 +07 22 44.179596 6.87 5.63 4.45 3.55 2.94 K3-IIIbFe0.5 249 1
22 HD 195633 PM* 20 32 23.9917031781 +06 31 03.251333868 9.05 9.03 8.52     G0Vw 125 0

    Equat.    Gal    SGal    Ecl

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2020.01.20-15:18:03

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