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Title: ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z = 2.5

Abstract

We investigate a correlation between star formation rate (SFR) and stellar mass for H α emission-line galaxies (HAEs) in one of the richest protoclusters ever known at z∼2.5, the USS 1558-003 protocluster. This study is based on a 9.7 hr narrowband imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample in combination with additional H -band data taken with WFC3 on the Hubble Space Telescope , of 100 HAEs reaching the dust-corrected SFRs down to 3 M {sub ⊙} yr{sup −1} and the stellar masses down to 10{sup 8.0} M {sub ⊙}. We find that while the star-forming galaxies with ≳10{sup 9.3} M {sub ⊙} are located on the universal SFR-mass main sequence (MS) irrespective of the environment, less massive star-forming galaxies with ≲10{sup 9.3} M {sub ⊙} show a significant upward scatter from the MS in this protocluster. This suggests that some less massive galaxies are in a starburst phase, although we do not know yet if this is due to environmental effects.

Authors:
;  [1]; ;  [2]; ; ;  [3];  [4]
  1. Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588 (Japan)
  2. Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720 (United States)
  3. Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), Mitaka, Tokyo 181-8588 (Japan)
  4. Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22654262
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 826; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATIONS; DUSTS; EMISSION; ENVIRONMENTAL EFFECTS; GALAXIES; GALAXY CLUSTERS; MASS; SPACE; STARS; TELESCOPES

Citation Formats

Hayashi, Masao, Kodama, Tadayuki, Tanaka, Ichi, Koyama, Yusei, Shimakawa, Rhythm, Suzuki, Tomoko L., Yamamoto, Moegi, and Tadaki, Ken-ichi, E-mail: masao.hayashi@nao.ac.jp. ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z = 2.5. United States: N. p., 2016. Web. doi:10.3847/2041-8205/826/2/L28.
Hayashi, Masao, Kodama, Tadayuki, Tanaka, Ichi, Koyama, Yusei, Shimakawa, Rhythm, Suzuki, Tomoko L., Yamamoto, Moegi, & Tadaki, Ken-ichi, E-mail: masao.hayashi@nao.ac.jp. ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z = 2.5. United States. doi:10.3847/2041-8205/826/2/L28.
Hayashi, Masao, Kodama, Tadayuki, Tanaka, Ichi, Koyama, Yusei, Shimakawa, Rhythm, Suzuki, Tomoko L., Yamamoto, Moegi, and Tadaki, Ken-ichi, E-mail: masao.hayashi@nao.ac.jp. Mon . "ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z = 2.5". United States. doi:10.3847/2041-8205/826/2/L28.
@article{osti_22654262,
title = {ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z = 2.5},
author = {Hayashi, Masao and Kodama, Tadayuki and Tanaka, Ichi and Koyama, Yusei and Shimakawa, Rhythm and Suzuki, Tomoko L. and Yamamoto, Moegi and Tadaki, Ken-ichi, E-mail: masao.hayashi@nao.ac.jp},
abstractNote = {We investigate a correlation between star formation rate (SFR) and stellar mass for H α emission-line galaxies (HAEs) in one of the richest protoclusters ever known at z∼2.5, the USS 1558-003 protocluster. This study is based on a 9.7 hr narrowband imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample in combination with additional H -band data taken with WFC3 on the Hubble Space Telescope , of 100 HAEs reaching the dust-corrected SFRs down to 3 M {sub ⊙} yr{sup −1} and the stellar masses down to 10{sup 8.0} M {sub ⊙}. We find that while the star-forming galaxies with ≳10{sup 9.3} M {sub ⊙} are located on the universal SFR-mass main sequence (MS) irrespective of the environment, less massive star-forming galaxies with ≲10{sup 9.3} M {sub ⊙} show a significant upward scatter from the MS in this protocluster. This suggests that some less massive galaxies are in a starburst phase, although we do not know yet if this is due to environmental effects.},
doi = {10.3847/2041-8205/826/2/L28},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 826,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}