Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/505/50   JK photometry in SA 57-6575, Her 1-5677 fields (Bershady+, 1998)

Near-infrared galaxy counts to J and K∼24 as a function of image size. Bershady M.A., Lowenthal J.D., Koo D.C. <Astrophys. J. 505, 50 (1998)> =1998ApJ...505...50B
ADC_Keywords: Galaxies, IR ; Photometry, infrared Keywords: cosmology: observations - galaxies: evolution - galaxies: photometry - galaxies: statistics - galaxies: structure - infrared: galaxies Abstract: We have used the Keck 10m telescope to count objects as a function of image size in two high Galactic latitude fields covering 1.5arcmin2 and reaching 50% completeness depths of K=24 and J=24.5 for stellar sources. Our counts extend ∼1mag deeper in K than those of surveys with other telescopes; complement other Keck surveys in the K-band that provide counts at comparable or shallower depths but that have not utilized image structure; and extend by several magnitudes the J-band counts from brighter surveys using smaller telescopes that cover larger areas. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 07 48.7 +29 17 44 SA 57-6575 = [K80] SA 57 6575 17 20 58.9 +49 46 55 Herc 1-5677 = [K80] Herc-1 5677 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2a.dat 69 130 Source catalog in SA 57-6575 table2b.dat 69 85 Source catalog in Herc 1-5677
Byte-by-byte Description of file: table2a.dat, table2b.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Field Field name (SA 57-6575 or Herc 1-5677) 13- 17 A5 --- ID Identification label (1) 18 A1 --- n_ID [cdefg] Note on ID (2) 20- 24 F5.1 arcsec Dx Offset in the x dimension of the NIRC detector (3) 26- 30 F5.1 arcsec Dy Offset in the y dimension of the NIRC detector (3) 32- 36 F5.2 mag Jmag ? J total magnitude (4) 38- 41 F4.2 mag e_Jmag ? rms uncertainty on Jmag 43- 47 F5.2 mag Kmag ? K total magnitude (4) 49- 52 F4.2 mag e_Kmag ? rms uncertainty on Kmag 54 A1 --- l_Prad Limit flag on Prad 55- 58 F4.2 arcsec Prad Apparent radius theta_0.5_ for eta=0.5 (5) 60- 63 F4.2 arcsec e_Prad ? rms uncertainty on Prad 65 A1 --- C [ls] Object class, identifying the size of the source, (l) large and (s) small 67- 69 A3 --- Sam [J,K ] Sample, identifying on which image(s) a source was detected, J and/or K
Note (1): Designations are: * skNNN or sjNNN for SA 57-6575 field * hkNNN or hjNNN for Herc 1-5677 field The objects are identified as <[BLK98] skNNN> and <[BLK98] hjNNN> in Simbad Note (2): the notes have the following meaning: c = sk144 is object SA 57-6575. d = hk066 is object Herc 1-5677. e = sk201 and hk124 are on the edge of their respective J-band images; J-magnitudes are estimates based on simple aperture photometry. f = sk045 and hk076 have size upper limits only. g = hj106 and hj101 are sources split from brighter objects in the J-band image with no corresponding sources split in the K-band image. The neighboring brighter source for hj106 is hk099, and for hj101 the brighter, neighboring source is hk091. Note (3): Absolute coordinates (epoch 1950) can be generated from Dx, Dy and the rotation of the NIRC detector and coordinates (see Fig.1) RA[SA576575] = 13h05m25.80s + (0.0701Dx)s - (0.0309Dy)s; DE[SA576575] = +29°33'44.3" + (0.404Dx)" + (0.915Dy)"; RA[Herc1-5677]= 17h19m43.1s + (0.0705Dx)s + (0.0756Dy)s; DE[Herc1-5677]= +49°49'47" + (0.731Dx)" - (0.682Dy)". Note (4): Magnitudes listed without estimated uncertainties are 1σ upper limits. Sources missing one of their J- or K-magnitudes were detected in one band but were not within the area of the image for the other band. A few sources have magnitudes and uncertainties listed for both bands, but are too faint, given their location in the images, to be counted in one of the two bands. Note (5): Petrosian radius: η is the ratio of the surface brightness at radius θ to the average surface brightness interior to θ. SA 57 radii for sources detected only in the J-band image are scaled by a factor of 0.762 to the seeing conditions of the K-band image based on simulations of model light profiles (see text)
History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 19-Nov-1998
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

catalogue service