2014ApJ...796...91B

Query : 2014ApJ...796...91B

2014ApJ...796...91B - Astrophys. J., 796, 91 (2014/December-1)

The quenching of the ultra-faint dwarf galaxies in the reionization era.

BROWN T.M., TUMLINSON J., GEHA M., SIMON J.D., VARGAS L.C., VANDENBERG D.A., KIRBY E.N., KALIRAI J.S., AVILA R.J., GENNARO M., FERGUSON H.C., MUNOZ R.R., GUHATHAKURTA P. and RENZINI A.

Abstract (from CDS):

We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our analysis employs a combination of high-precision photometry obtained with the Advanced Camera for Surveys on the Hubble Space Telescope, medium-resolution spectroscopy obtained with the DEep Imaging Multi-Object Spectrograph on the W. M. Keck Observatory, and updated Victoria-Regina isochrones tailored to the abundance patterns appropriate for these galaxies. The data for five of these Milky Way satellites are best fit by a star formation history where at least 75% of the stars formed by z ∼ 10 (13.3 Gyr ago). All of the galaxies are consistent with 80% of the stars forming by z ∼ 6 (12.8 Gyr ago) and 100% of the stars forming by z ∼ 3 (11.6 Gyr ago). The similarly ancient populations of these galaxies support the hypothesis that star formation in the smallest dark-matter sub-halos was suppressed by a global outside influence, such as the reionization of the universe.

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Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation - galaxies: photometry - galaxies: stellar content - Local Group

Simbad objects: 11

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Number of rows : 11
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
3 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
4 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
5 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
6 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
7 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
8 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
9 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
10 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
11 NAME Local Group GrG ~ ~           ~ 9325 0

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