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The Local Group dwarf Leo T: HI on the brink of star formation | | Emma V. Ryan-Weber
; Ayesha Begum
; Tom Oosterloo
; Sabyasachi Pal
; Michael J. Irwin
; Vasily Belokurov
; N. Wyn Evans
; Daniel B. Zucker
; | | Date: |
19 Nov 2007 | | Abstract: | 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 7x10^20
cm^-2, and the total HI mass is 2.8x10^5 Msun, 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 3.3x10^6 Msun, and a mass-to-light ratio of greater than 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, especially at radii beyond 50 pc. 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, it is also the most dark matter dominated,
gas-rich dwarf in the Local Group. | | Source: | arXiv, 0711.2979 | | Services: | Forum | Review | PDF | Favorites | |
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