The nature of VV76 (NGC 4496A,B)

Details The nature of VV76 (NGC 4496A,B) The nature of VV76 (NGC 4496A,B)

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1233f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Oct. 1988, p. 1233-1241. Research supported by the

Astronomy and Astrophysics

Astronomy

3

Galaxies, Red Shift, Supernovae, Visible Spectrum, Brightness Distribution, Charge Coupled Devices, Emission Spectra, H Ii Regions

Scientific paper

Long-slit optical spectra show that the northern member (NGC 4496 A) of the binary galaxy VV 76 has a systematic velocity of cz = 1700 km s-1, whereas the southern member (NGC 4496 B) has the considerably higher velocity of cz = 4510 km s-1. A series of three narrow-band CCD images confirms the presence of two distinct redshift systems, showing that the galaxies form an optical, rather than a physical, binary. The authors also discovered, quite serendipitously, and old type II supernova (SN 1988M) in NGC 4496 B. If NGC 4496 B were a physical companion of NGC 4496 A, SN 1988M should have been quite bright at maximum. The fact that it was not detected earlier argues against the hypothesis of discordant redshifts.

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