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Constraining the Distribution of L- & T-Dwarfs in the Galaxy | Russell E. Ryan Jr.
; Nimish P. Hathi
; Seth H. Cohen
; Rogier A. Windhorst
; | Date: |
25 Aug 2005 | Journal: | Astrophys.J. 631 (2005) L159-L162 | Subject: | astro-ph | Abstract: | We estimate the thin disk scale height of the Galactic population of L- & 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- & T- dwarfs based on their (i’-z’) color and morphology. By comparing these star counts to a simple Galactic model, we estimate the scale height to be 350+-50 pc that 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 10^9 M_{sol} of the Milky Way can be in the form L- & T- dwarfs, and confirm that high-latitude, z~6 galaxy surveys which use the i’-band dropout technique are 97-100% free of L- & T- dwarf interlopers. | Source: | arXiv, astro-ph/0508555 | Services: | Forum | Review | PDF | Favorites |
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