Discovery of a huge low-surface-brightness galaxy - A protodisk galaxy at low redshift?

Details Discovery of a huge low-surface-brightness galaxy - A protodisk galaxy at low redshift? Discovery of a huge low-surface-brightness galaxy - A protodisk galaxy at low redshift?

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94...23b&link_type=abstract

Astronomical Journal (ISSN 0004-6356), vol. 94, July 1987, p. 23-29.

Astronomy and Astrophysics

Astronomy

202

Astronomical Spectroscopy, Brightness Distribution, Galactic Evolution, Galactic Structure, Red Shift, Emission Spectra, Hydrogen Clouds, Spectral Line Width, Surface Properties

Scientific paper

The authors report on the accidental discovery of an extremely large, extremely H I-rich low-surface-brightness galaxy located at a redshift of z = 0.083. Its nuclear spectrum exhibits broad, low-level emission lines. Surface photometry at V indicates the presence of a bulge component and a very extended disk, with scale length of ≈45arcsec (55 kpc for H0 = 100) and with central surface brightness of V(0) ≈ 25.5 mag arcsec-2. The total amount of H I is at least 1.0×1011M_sun;. This amount of H I is at least 5 times more H I than any spiral galaxy previously observed. If disk formation is a quiescent process, then it is likely that the authors have caught a disk in the process of formation. They also point out that the properties of this disk are likely to be similar to the suspected sources that produce the observed damped Lyα absorption profiles that are so conspicuous at z ≈ 2.

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