Query : 2009A&A...493...23K

2009A&A...493...23K - Astronomy and Astrophysics, volume 493, 23-31 (2009/1-1)

Revisiting the optical depth of spiral galaxies using the Tully-Fisher B relation.


Abstract (from CDS):

We attempt to determine the optical depth of spiral galaxy disks by a statistical study of new Tully-Fisher data from the ongoing KLUN+ survey, and to clarify the difference between the true and apparent behavior of optical depth. By utilizing so-called normalized distances, a subsample of the data is identified to be as free from selection effects as possible. For these galaxies, a set of apparent quantities are calculated for face-on positions using the Tully-Fisher diameter and magnitude relations. These values are compared with direct observations to determine the mean value of the parameter C describing the optical depth. The present study suggests that spiral galaxy disks are relatively optically thin τB≃0.1, at least in the outermost regions, while they appear in general to be optically thick τB>1 when the apparent magnitude and average surface brightness are studied statistically.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: photometry - galaxies: ISM - galaxies: fundamental parameters

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6322 0
2 NAME Local Group GrG ~ ~           ~ 7774 0

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