Neutral Hydrogen Emission and Galaxies
Neutral Hydrogen (HI) is found in most galaxies. We can detect HI from
its 21cm line emission. In a cloud of HI that is dense enough, the
interactions between the hydrogen atoms is enough to stimulate the
21cm emission, therefore clouds of HI gas can be detected even when
there is no other radiation present (ie: we don't need stars to detect
Research areas that are undertaken at Jodrell Bank
A list of refereed publications from the past few years by
members of the group.
Links for observatories
and other Neutral Hydrogen Research groups.
Maintianed by Virginia
Last Modified 8 March 2001
The main research that is done at Jodrell Bank is a blind survey of
the northern sky looking for HI in galaxies. This survey uses a 4 beam
system, which is mounted on the Lovell Telescope. The
areas surveyed so far include the +74 declination band, which is a
strip of sky 8 degrees wide covering all R.A. We have also surveyed
the M82 group, Abell 1367, part of the Virgo cluster, and the
intersection of the zone of avoidance with the supergalactic plane.
Types of Galaxies found
Most of the galaxies found so far are normal spiral galaxies, Sb-Sc
being the most common. In addition, a number of optically faint, yet
HI-rich galaxies have been discovered.
- 'HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group'
- S. D. Ryder, B. Koribalski, L. Staveley-Smith, V. Kilborn, D. Malin,
G. Banks, D. Barnes, R. Bhatal, W. de Blok, P. Boyce, M. Disney, M.
Drinkwater, R. Ekers, K. Freeman, B. Gibson, P. Henning, H. Jerjen, P.
Knezek, M. Marquarding, R. Minchin, J. Mould, T. Oosterloo, R. Price, M.
Putman, E. Sadler, I. Stewart, F. Stootman, R. Webster, and
A. Wright, to be published in ApJ, Vol. 555, 1 July 2001.
- `An Extragalactic H I Cloud with No Optical Counterpart?'
- Kilborn, V. A., Staveley-Smith, L., Marquarding, M., Webster, R. L.,
Malin, D. F., Banks, G. D., Bhathal, R., de Blok, W. J. G.; Boyce,
P. J., Disney, M. J., Drinkwater, M. J., Ekers, R. D.; Freeman, K. C.,
Gibson, B. K., Henning, P. A., Jerjen, H., Knezek, P. M., Koribalski, B.
Minchin, R. F. Mould, J. R. Oosterloo, T. Price, R. M. Putman, M. E.
Ryder, S. D. Sadler, E. M. Stewart, I. Stootman, F. Wright, A. E., AJ 2000, 120, 1342
- `New Galaxies Discovered in the First Blind H I Survey of the
Centaurus A Group'
- Banks, G. D.; Disney, M. J.; Knezek, P. M.; Jerjen, H.; Barnes, D. G.;
Bhatal, R., de Blok, W. J. G.; Boyce, P. J.; Ekers, R. D.,Freeman, K. C.;
Gibson, B. K., Henning, P. A.; Kilborn, V.; Koribalski, B.,
Kraan-Korteweg, R. C.; Malin, D. F., Minchin, R. F.; Mould, J. R.;
Oosterloo, T.; Price, R. M., Putman, M. E.; Ryder, S. D., Sadler, E. M.,
Staveley-Smith, L.; Stewart, I., Stootman, F.; Vaile, R. A.; Webster, R.
L., Wright, A. E., ApJ 1999, 524, 612
- `HI mass function from HIPASS'
- Kilborn, V., Webster, R. and Staveley-Smith, L., PASA 1999, 16, 8
- `Tidal disruption of the Magellanic Clouds by the Milky Way.'
- Putman, M. E., Gibson, B. K., Staveley-Smith, L., Banks, G., Barnes, D.
G., Bhatal, R., Disney, M. J., Ekers, R. D., Freeman, K. C., Haynes,
R. F., Henning, P., Jerjen, H., Kilborn, V., Koribalski, B., Knezek, P.,
Malin, D. F., Mould, J. R., Oosterloo, T., Price, R. M., Ryder, S. D.,
Sadler, E. M., Stewart, I., Stootman, F., Vaile, R. A., Webster, R. L.,
Wright, A. E., Nature, 1998, 394, 752
The following links are to observatories that conduct research in
neutral hydrogen, or HI research projects.
Home Page - The southern all-sky survey, conducted at the
Parkes Radio-Telescope in Australia.
- ATNF -
Home page of the Australia Telescope National Facility.
- WRST -
Westerbork Synthesis Radio Telescope.
- NRAO - The American National
Radio Astronomy Observatory. This include the Green Bank Telescope,
and the Very Large Array (VLA).