2008MNRAS.384..535R


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST06:14:39

2008MNRAS.384..535R - Mon. Not. R. Astron. Soc., 384, 535-540 (2008/February-3)

The Local Group dwarf Leo T: HI on the brink of star formation.

RYAN-WEBER E.V., BEGUM A., OOSTERLOO T., PAL S., IRWIN M.J., BELOKUROV V., EVANS N.W. and ZUCKER D.B.

Abstract (from CDS):

We present Giant Meterwave Radio Telescope (GMRT) and Westerbork Synthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak HI column density is measured to be 7x1020/cm2, and the total HI mass is 2.8x105M, based on a distance of 420 kpc. Leo T has both cold (∼500 K) and warm (∼6000 K) HI at its core, with a global velocity dispersion of 6.9 km/s, from which we derive a dynamical mass within the HI radius of 3.3x106M, and a mass-to-light ratio of >50. We calculate the Jeans mass from the radial profiles of the HI column density and velocity dispersion, and predict that the gas should be globally stable against star formation. This finding is inconsistent with the half light radius of Leo T, which extends to 170 pc, and indicates that local conditions must determine where star formation takes place. Leo T is not only the lowest luminosity galaxy with on-going star formation discovered to date, but it is also the most dark matter-dominated, gas-rich dwarf in the Local Group.

Abstract Copyright: © 2008 The Authors

Journal keyword(s): galaxies: dwarf - galaxies: individual: Leo T - galaxies: ISM - Local Group - dark matter

Simbad objects: 11

goto Full paper

goto View the reference in ADS

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 - 2019
#notes
1 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 351 0
2 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 431 2
3 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1231 1
4 QSO B0839+187 QSO 08 42 05.09417058 +18 35 40.9905528   16.63 16.36 16.56   ~ 159 2
5 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 296 0
6 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 535 0
7 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3615 1
8 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 200 0
9 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 269 1
10 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 408 1
11 NAME Local Group GrG ~ ~           ~ 6660 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008MNRAS.384..535R and select 'bookmark this link' or equivalent in the popup menu


2019.10.21-06:14:39

© Université de Strasbourg/CNRS

    • Contact