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Title:
Constraining the Distribution of L and T Dwarfs in the Galaxy
Authors:
Ryan, R. E., Jr.; Hathi, N. P.; Cohen, S. H.; Windhorst, R. A.
Affiliation:
AA(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504 ), AB(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504 ), AC(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504 ), AD(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504 )
Publication:
The Astrophysical Journal, Volume 631, Issue 2, pp. L159-L162. (ApJL Homepage)
Publication Date:
10/2005
Origin:
UCP
ApJ Keywords:
Galaxy: Stellar Content, Galaxy: Structure, Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/497368
Bibliographic Code:
2005ApJ...631L.159R

Abstract

We estimate the thin-disk scale height of the Galactic population of L and T dwarfs based on star counts from 15 deep parallel fields from the Hubble Space Telescope. From these observations, we have identified 28 candidate L and T dwarfs based on their i'-z' color and morphology. By comparing these star counts with a simple Galactic model, we estimate the scale height to be 350+/-50 pc, which is consistent with the increase in vertical scale with decreasing stellar mass and is independent of reddening, color-magnitude limits, and other Galactic parameters. With this refined measure, we predict that less than 109 Msolar of the Milky Way can be in the form of L and T dwarfs and confirm that high-latitude, z~=6 galaxy surveys that use the i'-band dropout technique are 97%-100% free of L and T dwarf interlopers.

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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