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J/AJ/123/2206       BRI photometry of 3 QSO fields           (Prochaska+, 2002)

Galaxies associated with z∼4 damped Ly α systems. I. Imaging and photometric selection. Prochaska J.X., Gawiser E., Wolfe A.M., Quirrenbach A., Lanzetta K.M., Chen H.-W., Cooke J., Yahata N. <Astron. J. 123, 2206 (2002)> =2002AJ....123.2206P
ADC_Keywords: QSOs ; Redshifts ; Photometry Keywords: galaxies: formation Abstract: This paper describes the acquisition and analysis of imaging data for the identification of galaxies associated with z∼4 damped Lyα systems. We present deep BRI images of three fields known to contain four z∼4 damped systems. We discuss the reduction and calibration of the data, detail the color criteria used to identify z∼4 galaxies, and present a photometric redshift analysis to complement the color selection. We have found no galaxy candidates closer to the QSO than 7" that could be responsible for the damped Lyα systems. Assuming that at least one of the galaxies is not directly beneath the QSO, we set an upper limit on this damped Ly α system of L<L*LBG/4. Finally, we have established a Web site to release these imaging data to the public, at http://kingpin.ucsd.edu/~dlaimg/papers/refern.html . The observations where made with LRIS on the Keck II telescope, on 13 Jan 1999 for PSS 0132+1341 and BR 0951-0450, and 23 Jan 1999 for PSS 1443+2724. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 97 3035 Photometry for PSS J0132+1341 table5.dat 97 3804 Photometry for BR 0951-0450 table6.dat 97 2667 Photometry for PSS J1443+2724
See also: http://kingpin.ucsd.edu/~dlaimg/papers/refern.html : reduced images Byte-by-byte Description of file: table4.dat table5.dat table6.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [PGW2002] Identification (1) 6- 11 F6.1 pix Xpix The X pixel coordinate 13- 18 F6.1 pix Ypix The Y pixel coordinate 20- 29 F10.6 deg RAdeg Decimal degree of Right Ascension (J2000) 31- 40 F10.6 deg DEdeg Decimal degree of Declination (J2000) 42 A1 --- l_Bmag Limit flag on Bmag (2) 44- 48 F5.2 mag Bmag The BAB band magnitude 50- 53 F4.2 mag e_Bmag The 1sigma error in Bmag (2) 55- 59 F5.2 mag Rmag The RAB band magnitude 61- 64 F4.2 mag e_Rmag The 1sigma error in Rmag (2) 66 A1 --- l_Imag Limit flag on Imag (2) 68- 72 F5.2 mag Imag The IAB band magnitude 74- 77 F4.2 mag e_Imag The 1sigma error in Imag (2) 79- 82 F4.2 --- z The most likely photometric redshift 84- 86 I3 --- Tmpl Best fit photometry data template number (3) 88- 91 F4.2 --- Pz Confidence level, as the probability that the actual redshift is in interval [z-0.1,z+0.1] 93- 96 F4.2 --- Pz4 Probability of an actual redshift in interval [3.5,4.5]
Note (1): Identification: Table 4: [PGW2002] PSS 0132+1341 NNNN (Nos 1-3035). Table 5: [PGW2002] BR 0951-0450 NNNN (Nos 1-3804). Table 6: [PGW2002] PSS 1443+2724 NNNN (Nos 1-2724). Note (2): Objects with fluxes <3σsky have reported upper limits equal to the maximum of the flux + 1σsky for positive fluxes, or setting its value to 1σsky for negative fluxes (see section 4 of the paper). These objects have the error in the magnitude set to 9.99. Note (3): Best fit photometry data template number: 1 = Elliptical 2 = Sab 3 = Scd 4 = Irr 5 = SB1 6 = SB2 7 = QSO >7 = Stars
History: From electronic version of the journal References: Gawiser et al., Paper II, in preparation
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-Jun-2002
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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