The HST Medium Deep Survey: progress towards resolution of the faint blue galaxy problem.

Details The HST Medium Deep Survey: progress towards resolution of the faint blue galaxy problem. The HST Medium Deep Survey: progress towards resolution of the faint blue galaxy problem.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apl%26c..36..355g&link_type=abstract

Astrophysical Letters and Communications, Vol. 36, Nos. 1 - 6, p. 355 - 361

Astronomy and Astrophysics

Astrophysics

Galaxy Counts: Galaxy Evolution, Galaxy Evolution: Irregular Galaxies, Cosmology: Galaxy Evolution

Scientific paper

WFPC2 on HST has provided the means to make rapid progress towards solving a long-standing problem in observational cosmology, viz. the nature of the objects contributing to the faint blue galaxy counts. The solution to this problem lies in the increasing number of irregular and peculiar systems seen as a function of increasing magnitude. Galaxies in the Medium Deep Survey (MDS) have been reliable classified to magnitudes I814 ⪉ 22.0 in the F814W band, at a mean redshift >z< ≡ 0.5. The clear picture which emerges from the MDS is one in which the giant ellipticals and spirals have been relatively stable since z = 0.7, whereas there is rapid evolution of the irregular galaxy population. This latter population is not at all homogeneous, however, and seems to comprise galaxies in formation as well as fading dwarf irregulars. The authors have found evidence for weak gravitational shear in the vicinity of field galaxies, and gravitational lenses in MDS and archival data, including the first two examples of HST - discovered "Einstein crosses" centered on elliptical galaxies.

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