2009MNRAS.392L..45R

Query : 2009MNRAS.392L..45R

2009MNRAS.392L..45R - Mon. Not. R. Astron. Soc., 392, L45-L49 (2009/January-1)

Late gas accretion on to primordial minihaloes: a model for Leo T, dark galaxies and extragalactic high-velocity clouds.

RICOTTI M.

Abstract (from CDS):

In this Letter, we revisit the idea of reionization feedback on dwarf galaxy formation. We show that primordial minihaloes with vcir< 20 km/s stop accreting gas after reionization, as it is usually assumed, but in virtue of their increasing concentration and the decreasing temperature of the intergalactic medium as redshift decreases below z = 3, they have a late phase of gas accretion and possibly star formation. We expect that pre-reionization fossils that evolved on the outskirts of the Milky Way or in isolation show a bimodal star formation history with 12- and <10-Gyr old population of stars. Leo T fits with this scenario. Another prediction of the model is the possible existence of a population of gas-rich minihaloes that never formed stars. More work is needed to understand whether a subset of compact high-velocity clouds can be identified as such objects or whether an undiscovered population of dark galaxies exists in the voids between galaxies.

Abstract Copyright: © 2008 The Author. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: formation - cosmology: theory

Simbad objects: 1

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Number of rows : 1
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 Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0

Query : 2009MNRAS.392L..45R

Basic data :
NAME Leo T -- Galaxy
Other object types: otypes_help 		G (2014AJ,AGC,...)
ICRS coord. (ep=J2000) : 		09 34 53.4 +17 03 05 [ ] D 2007ApJ...656L..13I
FK4 coord. (ep=B1950 eq=1950) : 		09 32 07.3 +17 16 29 [ ]
Gal coord. (ep=J2000) : 		214.8524 +43.6609 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 38.1 [2.0] / z(spectroscopic) 0.000127 [0.000007] / cz 38.10 [2.00]
   C 2012AJ....144....4M
Morphological type: 		dI/dGsp... D 2012MNRAS.426.1808T
Fluxes (1) :
V 15.1 [0.5] D 2012AJ....144....4M
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Hierarchy : number of linked objects
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: 3
: 31 		: 102 Display criteria :

Identifiers (5) :
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NAME Leo T LEDA 4713564 NAME Leo T dSph
AGC 198305 NAME Leo T Dwarf

References (434 between 1850 and 2026) (Total 434)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Velocities : 2    Distance : 5   

   

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Data at NED - NASA/IPAC Extragalactic Database : NAME Leo T

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