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 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