NGC 1961 - Stripping of a supermassive spiral galaxy

Details NGC 1961 - Stripping of a supermassive spiral galaxy NGC 1961 - Stripping of a supermassive spiral galaxy

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..293s&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 2, Nov. 1982, p. 293-307.

Astronomy and Astrophysics

Astronomy

44

Galactic Structure, Intergalactic Media, Radio Astronomy, Spiral Galaxies, X Ray Astronomy, Astronomical Maps, Astronomical Photography, Galactic Nuclei, Hydrogen Clouds, Line Spectra, Radial Velocity, Velocity Distribution

Scientific paper

The peculiar supermassive Sb spiral galaxy NGC 1961 has been mapped in the 21 cm line of neutral hydrogen with a resolution of 0.5 arcmin using the Westerbork Synthesis Radio Telescope. An unusual 'head-tail' morphology for the H I is found, consisting of a wing of gas extending 30 kpc to the NW, and a sharp edge to the SE. The latter lies well within the 26.5 m/sq arcsec blue optical contour (Holmberg radius). Radio continuum emission is observed in a ridge coincident with the SE spiral arm, and an X-ray map produced with the IPC of the Einstein satellite reveals an arc-shaped structure which is also aligned with the ridge. These observations are interpreted as indicating that the gas in NGC 1961 is being stripped by a hot intergalactic medium of density of at least 0.001/cu cm and total mass more than 10 billion solar masses. From the observed morphology, this gas would be located in the direction of the center of mass of a group of galaxies located SE of NGC 1961. Five group members have also been detected in H I.

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