Constraining the Distribution of L and T Dwarfs in the Galaxy
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 compa...
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| Veröffentlicht in: | The Astrophysical journal 2005-10, Vol.631 (2), p.L159-L162 |
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| creator | Ryan, Jr., R. E Hathi, N. P Cohen, S. H Windhorst, R. A |
| description | 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 c 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 10 super(9) M sub( )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. |
| doi_str_mv | 10.1086/497368 |
| format | Article |
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| title | Constraining the Distribution of L and T Dwarfs in the Galaxy |
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