Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band

Details Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7212g&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #72.12; Bulletin of the American Astronomical Society, Vol. 25, p.1403

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze the photometric properties of a sample of 1450 Sbc--Sc galaxies with known redshifts, single--dish HI profiles and CCD I band images to derive laws that relate the measured isophotal radius at mu_I =23.5, magnitude, scale length and HI flux to the face--on aspect. Our results show that the central regions of spiral galaxies are substantially less transparent than most previous determinations suggest, but not as opaque as claimed by Valentijn (1990). Regions in the disk farther than two or three scale lengths from the center are close to completely transparent. In addition to statistically derived relations for the inclination dependence of photometric parameters, we present the results of a modelling exercise that utilizes the ``triplex'' model of Disney et al. (1989). Within the framework of that model, late spiral disks at I band have central optical depths on the order of tau_I ~ 5 and dust absorbing layers with scale heights on the order of half that of the stellar component. We discuss our results in light of previous determinations of internal extinction relations and point out the substantial impact of internal extinction on the scatter of the Tully--Fisher relation. We also find that the visual diameters by which large catalogs are constructed (UGC, ESO--Uppsala) are nearly proportional to face--on isophotal diameters.

Affiliated with

Also associated with

No associations

Rating

Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Redshift--Independent Distances of Spiral Galaxies: II. Internal Extinction at I Band will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-779891