When did the Hubble sequence appear?: Subaru observations of distant field and cluster galaxies

Toru Yamada

doi:10.1117/12.457512

13 February 2003 When did the Hubble sequence appear? Subaru observations of distant field and cluster galaxies

Toru Yamada

Proceedings Volume 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II; (2003) https://doi.org/10.1117/12.457512
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We conducted deep NIR and optical imaging observations in general fields as well as the fields of cluster of galaxies and candidates at z > 1. In the observed rich cluster environment, massive galaxies have been well developed by z=1.2-1.3. However, in a general field, HDF-N, we see conspicuous and sudden decrease of comoving number density of early-type galaxies above z=1. There are few galaxies as massive as present-day L* galaxies at z=2-4 in HDF-N. Their rest-frame optical light is dominated by very young stellar population and their morphology also does not show any clear sequence. Thus formation/evolution of galaxies seems to strongly depend on their density environment and in general fields massive galaxies which form present-day Hubble sequence might have been formed between 1 < z < 2 while early type galaxies in clusters formed earlier epoch.

Citation Download Citation

Toru Yamada "When did the Hubble sequence appear? Subaru observations of distant field and cluster galaxies", Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); https://doi.org/10.1117/12.457512

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KEYWORDS

Galactic astronomy

Hubble Space Telescope

Near infrared

Spectroscopy

Data archive systems

Data modeling

Galaxy groups and clusters

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