Observation of neutral hydrogen in the globular cluster NGC 2808

Details Observation of neutral hydrogen in the globular cluster NGC 2808 Observation of neutral hydrogen in the globular cluster NGC 2808

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374l..45f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 374, June 20, 1991, p. L45-L49.

Astronomy and Astrophysics

Astrophysics

18

Emission Spectra, Globular Clusters, H I Regions, Neutral Gases, Hydrogen, Interstellar Gas, Radial Velocity

Scientific paper

The Parkes 64-m reflector of the Australia Telescope National Facility was used to observe globular clusters in the 21-cm line. In the direction of NGC 2808, H I emission was detected with the following characteristics: (1) the peak of the spatial distribution is located on the cluster's center; (2) the peak of the velocity distribution matches the cluster's published radial velocity of 98 km/s to within its quoted uncertainly of 4 km/s; and (3) the FWHM of the H I profile is consistent with the cluster's published stellar velocity dispersion and escape velocity. The characteristics of this emission are very suggestive of its being due, at least in part, to gas which is physically associated with the cluster. This is not beyond dispute, however, since there is known to be an extended region around the cluster exhibiting foreground 21-cm emission at about the cluster's radial velocity. If further observations confirm that the emitting gas is intrinsic to NGC 2808, this would constitute the first significant detection of H I within a globular cluster.

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