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Spitzer Photometry of WISE-Selected Brown Dwarf and Hyper-Luminous Infrared Galaxy Candidates | | Roger L. Griffith
; J. Davy Kirkpatrick
; Peter R. M. Eisenhardt
; Christopher R. Gelino
; Michael C. Cushing
; Dominic Benford
; Andrew Blain
; Carrie R. Bridge
; Martin Cohen
; Roc M. Cutri
; Emilio Donoso
; Thomas H. Jarrett
; Carol Lonsdale
; Gregory Mace
; A. Mainzer
; Ken Marsh
; Deborah Padgett
; Sara Petty
; Michael E. Ressler
; Michael F. Skrutskie
; Spencer A. Stanford
; Daniel Stern
; Chao-Wei Tsai
; Edward L. Wright
; Jingwen Wu
; Lin Yan
; | | Date: |
10 Sep 2012 | | Abstract: | We present Spitzer 3.6 and 4.5 $mu$m photometry and positions for a sample
of 1510 brown dwarf candidates identified by the WISE all-sky survey. Of these,
166 have been spectroscopically classified as objects with spectral types M(1),
L(7), T(146), and Y(12); Sixteen other objects are non-(sub)stellar in nature.
The remainder are most likely distant L and T dwarfs lacking spectroscopic
verification, other Y dwarf candidates still awaiting follow-up, and assorted
other objects whose Spitzer photometry reveals them to be background sources.
We present a catalog of Spitzer photometry for all astrophysical sources
identified in these fields and use this catalog to identify 7 fainter (4.5
$mu$m $sim$ 17.0 mag) brown dwarf candidates, which are possibly wide-field
companions to the original WISE sources. To test this hypothesis, we use a
sample of 919 Spitzer observations around WISE-selected high-redshift
hyper-luminous infrared galaxy (HyLIRG) candidates. For this control sample we
find another 6 brown dwarf candidates, suggesting that the 7 companion
candidates are not physically associated. In fact, only one of these 7 Spitzer
brown dwarf candidates has a photometric distance estimate consistent with
being a companion to the WISE brown dwarf candidate. Other than this there is
no evidence for any widely separated ($>$ 20 AU) ultra-cool binaries. As an
adjunct to this paper, we make available a source catalog of $sim$ 7.33
$ imes 10^5$ objects detected in all of these Spitzer follow-up fields for use
by the astronomical community. The complete catalog includes the Spitzer 3.6
and 4.5 $mu$m photometry, along with positionally matched $B$ and $R$
photometry from USNO-B; $J$, $H$, and $K_s$ photometry from 2MASS; and $W1$,
$W2$, $W3$, and $W4$ photometry from the WISE all-sky catalog. | | Source: | arXiv, 1209.1855 | | Services: | Forum | Review | PDF | Favorites | |
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