Discovery Of Massive, Mostly Star Formation Quenched Galaxies With Extremely Large Lyα Equivalent Widths At Z ∼ 3

Yoshiaki Taniguchi; Masaru Kajisawa; Masakazu A. R Kobayashi; Tohru Nagao; Yasuhiro Shioya; Nick Z Scoville; David B Sanders; Peter L Capak; Anton M Koekemoer; Sune Toft; Henry J McCracken; Olivier Le Fèvre; Lidia Tasca; Kartik Sheth; Alvio Renzini; Simon Lilly; Marcella Carollo; Katarina Kovač; Olivier Ilbert; Eva Schinnerer; Hai Fu; Laurence Tresse; Richard E Griffiths; Francesca Civano

doi:10.1088/2041-8205/809/1/L7

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Discovery Of Massive, Mostly Star Formation Quenched Galaxies With Extremely Large Lyα Equivalent Widths At Z ∼ 3

Journal article

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Discovery Of Massive, Mostly Star Formation Quenched Galaxies With Extremely Large Lyα Equivalent Widths At Z ∼ 3

Yoshiaki Taniguchi, Masaru Kajisawa, Masakazu A. R Kobayashi, Tohru Nagao, Yasuhiro Shioya, Nick Z Scoville, David B Sanders, Peter L Capak, Anton M Koekemoer, Sune Toft, …

Astrophysical journal. Letters, Vol.809(1), L7

08/10/2015

DOI: 10.1088/2041-8205/809/1/L7

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Abstract

We report a discovery of six massive galaxies with both extremely large Lyα equivalent widths (EWs) and evolved stellar populations at z ∼ 3. These MAssive Extremely STrong Lyα emitting Objects (MAESTLOs) have been discovered in our large-volume systematic survey for strong Lyα emitters (LAEs) with 12 optical intermediate-band data taken with Subaru/Suprime-Cam in the COSMOS field. Based on the spectral energy distribution fitting analysis for these LAEs, it is found that these MAESTLOs have (1) large rest-frame EWs of EW0 (Lyα) ∼ 100–300 Å, (2) M⋆ ∼ 1010.5–1011.1 M⊙, and (3) relatively low specific star formation rates of SFR/M⋆ ∼ 0.03–1 Gyr−1. Three of the six MAESTLOs have extended Lyα emission with a radius of several kiloparsecs, although they show very compact morphology in the HST/ACS images, which correspond to the rest-frame UV continuum. Since the MAESTLOs do not show any evidence for active galactic nuclei, the observed extended Lyα emission is likely to be caused by a star formation process including the superwind activity. We suggest that this new class of LAEs, MAESTLOs, provides a missing link from star-forming to passively evolving galaxies at the peak era of the cosmic star formation history.

Cosmology

Morphology

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

EMISSION SPECTRA

ENERGY SPECTRA

GALAXIES

GALAXY NUCLEI

IMAGES

LYMAN LINES

RED SHIFT

STAR EVOLUTION

STARS

UNIVERSE

Details

Title: Subtitle: Discovery Of Massive, Mostly Star Formation Quenched Galaxies With Extremely Large Lyα Equivalent Widths At Z ∼ 3
Creators: Yoshiaki Taniguchi - Ehime University
Masaru Kajisawa - Ehime University
Masakazu A. R Kobayashi - Ehime University
Tohru Nagao - Ehime University
Yasuhiro Shioya - Ehime University
Nick Z Scoville - California Institute of Technology
David B Sanders - University of Hawaii
Peter L Capak - California Institute of Technology
Anton M Koekemoer - Space Telescope Science Institute
Sune Toft - University of Copenhagen
Henry J McCracken - Institut d'Astrophysique de Paris
Olivier Le Fèvre - Aix-Marseille Université
Lidia Tasca - Aix-Marseille Université
Kartik Sheth - National Radio Astronomy Observatory
Alvio Renzini - University of Padua
Simon Lilly - ETH Zurich
Marcella Carollo - ETH Zurich
Katarina Kovač - ETH Zurich
Olivier Ilbert - Aix-Marseille Université
Eva Schinnerer
Hai Fu - University of Iowa, Physics and Astronomy
Laurence Tresse - Aix-Marseille Université
Richard E Griffiths - University of Hawaii at Hilo
Francesca Civano - Smithsonian Astrophysical Observatory
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.809(1), L7
DOI: 10.1088/2041-8205/809/1/L7
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: The American Astronomical Society
Language: English
Date published: 08/10/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199696802771

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