Surface photometry and distance of NGC 4156 from high-resolution optical observations

Details Surface photometry and distance of NGC 4156 from high-resolution optical observations Surface photometry and distance of NGC 4156 from high-resolution optical observations

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..291n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 291-302.

Astronomy and Astrophysics

Astrophysics

3

Astrometry, Astronomical Photometry, Barred Galaxies, Galactic Structure, Red Shift, X Ray Sources, Cosmology, Distance, Galactic Nuclei, Hubble Constant, Luminosity, Tides

Scientific paper

From high-resolution and regular-resolution observations of the barred spiral galaxy NGC 4156 it is found: (1) NGC 4156 is an SBrs(bc) galaxy of luminosity class I. (2) NGC 4156 does not seem to be associated with the Seyfert galaxy NGC 4156. (3) The observations are consistent with a (thin) disk component. (4) The determination of profile of the arm-to-disk ratio confirms the classification of NGC 4156 as an Sbc galaxy. (5) A distance of 70 Mpc and an individual Hubble ratio H0 = 97 km s-1 Mpc-1 with other values of H0 in the same distance system. This also confirms a cosmological distance for NGC 4156. (6) The abnormal nuclear X-ray emission in NGC 4156 observed by Elvis et al. (1981) might be due to a violent tidal interaction provoked by a close encounter with its northern companion G2.

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