When did the Hubble sequence appear? Morphology, color, and number-density evolution of the galaxies in the Hubble Deep Field North

Masaru Kajisawa, Toru Yamada

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Using the HST WFPC2/NICMOS archival data of the Hubble Deep Field North, we constructed a nearly complete sample of the Mv < -20 (∼ L* + 1) galaxies to z = 2, and investigate when the Hubble sequence appeared, namely, the evolution of the morphology, colors, and the comoving number density of the sample. Even if taking into account the uncertainty of the photometric redshift technique, the number density of relatively bright bulge-dominated galaxies in the HDF-N decreases significantly at z > 1, and their rest-frame U - V color distribution is wide-spread over 0.5 < z < 2. On the other hand, while the number density of both disk-dominated and irregular galaxies does not show a significant change at 0.5 < z < 2, their distribution of the rest-frame U - V color alters at z ∼ 1.5; there is no relatively red (rest U - V ≳ 0.3) galaxies at z > 1.5, while a significant fraction of these red disk-dominated or irregular galaxies exist at z < 1.5. These results suggest that the significant evolution of the Hubble sequence, which is seen in the present Universe, occurs at 1 < z < 2.

Original languageEnglish
Pages (from-to)833-852
Number of pages20
JournalPublications of the Astronomical Society of Japan
Volume53
Issue number5
DOIs
Publication statusPublished - 2001 Oct 25

Keywords

  • Galaxies: evolution
  • Galaxies: field
  • Galaxies: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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