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J/AJ/134/2385       Occulting galaxy pairs in SDSS           (Holwerda+, 2007)

Spiral disk opacity from occulting galaxy pairs in the Sloan Digital Sky Survey. Holwerda B.W., Keel W.C., Bolton A. <Astron. J., 134, 2385-2397 (2007)> =2007AJ....134.2385H
ADC_Keywords: Galaxies, photometry ; Photometry, SDSS Keywords: dust, extinction - galaxies: evolution - galaxies: fundamental parameters - galaxies: ISM - galaxies: spiral - galaxies: structure Abstract: A spiral galaxy partially overlapping a more distant elliptical offers a unique opportunity to measure the dust extinction in the foreground spiral. From the Sloan Digital Sky Survey (SDSS) DR4 spectroscopic sample, we selected 83 occulting galaxy pairs and measured disk opacity over the redshift range z=0.0-0.2 with the goal of determining the recent evolution of disk dust opacity. The enrichment of the ISM changes over the lifetime of a disk, and it is reasonable to expect the dust extinction properties of spiral disks as a whole to change over their lifetime. When they do, the change will affect our measurements of galaxies over the observable universe. From the SDSS pairs we conclude that spiral disks show evidence of extinction to ∼2 effective radii. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 83 SDSS basic data of the occulting galaxy pairs
See also: http://www.sdss.org : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Plate SDSS plate number 6- 10 I5 --- MJD SDSS MJD number 12- 14 I3 --- Fiber SDSS Fiber number 16- 24 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 25 A1 --- --- [0] 26- 34 F9.5 deg DEdeg Declination in decimal degrees (J2000) 35 A1 --- --- [0] 37- 42 F6.4 --- zfg Foreground redshift 44- 49 F6.4 --- zbg Background redshift 51- 55 F5.2 mag umag SDSS u magnitude 57- 61 F5.2 mag gmag SDSS g magnitude 63- 67 F5.2 mag rmag SDSS r magnitude 69- 73 F5.2 mag imag SDSS i magnitude 75- 79 F5.2 mag zmag SDSS z magnitude
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Feb-2010
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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