HUBBLE SPACE TELESCOPE OBSERVATIONS OF FIELD ULTRACOOL DWARFS AT HIGH GALACTIC LATITUDE

被引：36
|
作者：
Ryan, R. E., Jr. [1 ]
Thorman, P. A. [1 ]
Yan, H. [2 ]
Fan, X. [3 ]
Yan, L. [4 ]
Mechtley, M. R. [5 ]
Hathi, N. P. [6 ]
Cohen, S. H. [5 ]
Windhorst, R. A. [5 ]
McCarthy, P. J. [6 ]
Wittman, D. M. [1 ]
机构：
[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
[2] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[4] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[5] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[6] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
来源：
ASTROPHYSICAL JOURNAL | 2011年 / 739卷 / 02期
基金：
美国国家科学基金会;
关键词：
brown dwarfs; Galaxy: stellar content; Galaxy: structure; stars: low-mass; DIGITAL SKY SURVEY; PROPER-MOTION SURVEY; LOW-MASS STARS; SPECTRAL TYPE-L; T-DWARFS; BROWN DWARFS; LUMINOSITY FUNCTION; RESOLVED SPECTROSCOPY; COOL NEIGHBORS; DEEP FIELD;
D O I：
10.1088/0004-637X/739/2/83
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a sample of 17 newly discovered ultracool dwarf candidates later than similar to M8, drawn from 231.90 arcmin(2) of Hubble Space Telescope Wide Field Camera 3 infrared imaging. By comparing the observed number counts for 17.5 <= J(125) <= 25.5 AB mag to an exponential disk model, we estimate a vertical scale height of z(scl) = 290 +/- 25 (random) +/- 31 (systematic) pc for a binarity fraction of f(b) = 0. While our estimate is roughly consistent with published results, we suggest that the differences can be attributed to sample properties, with the present sample containing far more substellar objects than previous work. We predict the object counts should peak at J(125) similar to 24 AB mag due to the exponentially declining number density at the edge of the disk. We conclude by arguing that trend in scale height with spectral type may breakdown for brown dwarfs since they do not settle onto the main sequence.
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页数：8
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