Icebergs and crouching giants

Details Icebergs and crouching giants Icebergs and crouching giants

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.329..203d&link_type=abstract

Nature (ISSN 0028-0836), vol. 329, Sept. 17, 1987, p. 203, 204.

Mathematics

Logic

17

Brightness, Disk Galaxies, Dwarf Galaxies, Virgo Galactic Cluster, Astronomical Photometry, Luminosity, Magnitude, Size Determination

Scientific paper

The recent discovery that an apparently insignificant dwarf in the Virgo Cluster is in fact a huge, low-surface-brightness galaxy in the background is discussed. The finding dramatically demonstrates that new populations of galaxies remain to be detected. Almost all of this particular galaxy's light lies below the detection threshold of normal observations (hence 'iceberg'), and it is indisputably a 'crouching giant' since despite its apparent insignificance its probable disk scale length of 55 kpc and total H I mass of 100 billion solar masses make it certainly the largest and the most H I-rich disk known and also one of the brightest of all spiral galaxies. The likelihood that other 'icebergs' exist is reviewed, and the implications of that existence for cosmological problems are addressed.

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