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J/AJ/125/2521 2MASS6x survey of the Lockman Hole (Beichman+, 2003)
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Beginning of ReadMe :J/AJ/125/2521 2MASS6x survey of the Lockman Hole (Beichman+, 2003)
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A deep 2MASS survey of the Lockman Hole.
Beichman C.A., Cutri R., Jarrett T., Stiening R., Skrutskie M.
<Astron. J. 125, 2521 (2003)>
=2003AJ....125.2521B
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ADC_Keywords: Surveys ; QSOs ; Photometry, infrared
Keywords: infrared radiation - quasars: general -
stars: low-mass, brown dwarfs - surveys
Abstract:
We have carried out a survey of the Lockman Hole covering over
24deg^2^ using the Two Micron All Sky Survey (2MASS) observing system
in a special mode that reaches roughly 1mag deeper than the nominal
2MASS survey. The resultant point-source catalog reaches to
approximately (J, H, Ks)<(17.8, 16.5, 16.0)mag with completeness and
reliability in excess of 90%-95% at the faintest levels. These data
will be useful in identifying sources in SIRTF surveys of this area.
We have cataloged 69,115 objects, almost twice as many as in the
nominal 2MASS survey of this region. The sample includes a large
number of potential new active galaxies, as well as a T dwarf
candidate.
Description:
The Lockman Hole region observed by 2MASS extends from
RA=10 29 45 to 11 00 33 and DE=54deg to 60deg, J2000.0.
While some 100mum cirrus is visible in the IRAS data, the median
cirrus background in this large area is only 0.4MJy/sr making the
region well suited to deep surveys at SIRTF wavelengths.
The observing strategy for the 6 x data was identical in all respects
to that of the main 2MASS survey, with the exception of the longer
integration time. The 2MASS data were obtained using 37 north-going or
south-going scans obtained over 14 nights between 2000 March 25 and
May 25.