An optical study of the cD galaxy NGC3311 and the giant elliptical galaxy NGC3309 in the cluster Hydra I

Details An optical study of the cD galaxy NGC3311 and the giant elliptical galaxy NGC3309 in the cluster Hydra I An optical study of the cD galaxy NGC3311 and the giant elliptical galaxy NGC3309 in the cluster Hydra I

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..335v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 335-347.

Astronomy and Astrophysics

Astrophysics

19

Active Galaxies, Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, Galactic Nuclei, Brightness Distribution, Emission Spectra, Isophotes, Line Spectra

Scientific paper

Two galaxies are examined by means of CCD surface photometry in order to compare the observed optical parameters with theoretical predictions. Specific attention is given to the dust cloud and bright spot in the center of NGC3311 (an active cD galaxy) and to the relative light distributions of the active giant elliptical galaxy NGC3309 and NGC3311. Spectra are also examined in the range of 620-710 nm to isolate ionized gas and H-alpha absorption in the galactic centers. The de Vaucouleurs law predicts higher luminosities in the innermost regions of the ellipticals than are observed, but the parameters for the r exp 1/4 law are consistent with the galaxies' respective classifications. The luminosity and mass ratios between the two galaxies are given, and the mass of the dust feature in NGC3311 is computed. The emission-line spectrum of NGC3311 is not consistent with its classification as a bright elliptical and is theorized to be related to the photoionization by young stars.

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