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J/AJ/125/2521       2MASS6x survey of the Lockman Hole        (Beichman+, 2003)

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
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 24deg2 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=54° to 60°, J2000.0. While some 100µm 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 119 69115 Lockman Hole Point-Source Data table7.dat 44 2427 Central Positions of Images in Lockman Hole Survey
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right ascension expressed in degrees (J2000) 13- 21 F9.6 deg DEdeg Declination expressed in degrees (J2000) 23- 38 A16 --- 2MASS6xp 2MASS designation (1) 40- 43 F4.2 arcsec errPos Uncertainty in single position axis 46- 51 F6.3 mag Jmag The J-band magnitude 54- 58 F5.3 mag e_Jmag The 1 sigma error in Jmag (2) 60- 65 F6.3 mag Hmag The H-band magnitude 68- 72 F5.3 mag e_Hmag The 1 sigma error in Hmag (2) 74- 79 F6.3 mag Ksmag The Ks band magnitude 82- 86 F5.3 mag e_Ksmag The 1 sigma error in Ksmag (2) 88 I1 --- RJ Read flag for the J-band photometry (3) 89 I1 --- RH Read flag for the H-band photometry (3) 90 I1 --- RKs Read flag for the K_s_ band photometry (3) 92 I1 --- BJ Blend flag for the J-band photometry (4) 93 I1 --- BH Blend flag for the H-band photometry (4) 94 I1 --- BKs Blend flag for the K_s_ band photometry (4) 96 A1 --- CJ Confusion flag for the J-band photometry (5) 97 A1 --- CH Confusion flag for the H-band photometry (5) 98 A1 --- CKs Confusion flag for the K_s_ band photometry (5) 101-105 F5.2 mag Bmag ?=99.99 USNO-A catalog blue magnitude (6) 108-112 F5.2 mag Rmag ?=99.99 USNO-A catalog red magnitude (6) 116-119 F4.2 arcsec Ropt ? Separation between optical source and 2MASS
Note (1): Sexagesimal position in HHMMSSSS, DDMMSSS format. For right ascension, the SSSS is quoted in centiseconds of time. For declination the SSS is quoted in deciseconds of arc. 2MASS6xp JHHMMSSss+DDMMSSs in Simbad Note (2): 9.999 or 8.888 denotes upper limit. Note (3): Read flags: 0 = No detection; 1 = Read-1 detection; 2 = Read2-Read-1 detection; 4 = Read2-Read-1 detection on two apparitions. Note (4): Blend flags: 0 = No detection; 1 = One source; 2 = Attempt to break up source into two sources (assign upper limit). Note (5): Confusion flags: 0 = No confusion; B = Blend. Note (6): 99.99 denotes upper limit.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 22 A22 --- FITSfile FITS file name 24- 33 F10.6 deg RAdeg Right ascension of image center expressed in degrees (J2000) 36- 44 F9.6 deg DEdeg Declination of image center expressed in degrees (J2000)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 16-Jun-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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