HST Planetary Camera Observations of Fornax a

Details HST Planetary Camera Observations of Fornax a HST Planetary Camera Observations of Fornax a

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0617d&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #06.17; Bulletin of the American Astronomical Society, Vol. 25, p.800

Astronomy and Astrophysics

Astronomy

Scientific paper

Planetary Camera images of nearby giant elliptical galaxy Fornax A (NGC 1316) taken with V and I-band filters reveal a central cusp down to 0asec04 rather than a core of radius 1asec04 as previously reported (Schweizer 1981), however; there is a substantial break in slope at 0asec9 . The profile in V-magnitudes at radii > 1('') can be fit by an r(1/4) law and at the center the deconvolved profile approaches an asymptotic power law slope of 1.4 and reaches >13.5\ mag/sq arcsec within 0asec1 . A color of V - I = 1.6 is seen over most of the galaxy. No significant color gradient is seen, thus there is no young stellar population that can account for the low M/L ratio at the center of this galaxy. The cusp cannot be exlained by a significant point mass at the center. Analysis is complicated by the existence of extinction clouds very close to the center. Color analysis reveals parts of the dust lane are substantially forward of center. Filamentary loops of extinction are seen close to the line-of-sight to the center.

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