Tidal Structures of z ~ 1 Galaxies in the Hubble Deep Field

Details Tidal Structures of z ~ 1 Galaxies in the Hubble Deep Field Tidal Structures of z ~ 1 Galaxies in the Hubble Deep Field

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26...61r&link_type=abstract

Astronomy Letters, vol. 26, p. 61-66 (2000)

Astronomy and Astrophysics

Astronomy

2

Scientific paper

An analysis of the images of objects in the Northern Hubble Space Telescope Deep Field has revealed twelve galaxies with tidal tails at redshifts from 0.5 to 1.5. The integrated characteristics of the newly discovered tidal structures are found to be similar to those of the tails of local interacting galaxies. The space density of galaxies with tidal tails is found to depend on z as (1 + z)^(4 +/- 1) (q_0 = 0.05), according to the data on objects with z = 0.5-1.0. The exponent decreases to 3.6 if barred galaxies are included. The change in the rate of close encounters between galaxies of comparable masses (i.e., those that produce extended tidal structures) is estimated. If the rate of galactic mergers is governed by the same process, our data are indicative of the rapid evolution of galaxy merger rate toward z ~ 1.

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