Taniguchi, Yoshiaki and Kajisawa, Masaru and Kobayashi, Masakazu A. R. and Nagao, Tohru and Shioya, Yasuhiro and Scoville, Nick Z. and Sanders, David B. and Capak, Peter L. and Koekemoer, Anton M. and Toft, Sune and McCracken, Henry J. and Le Fèvre, Olivier and Tasca, Lidia and Sheth, Kartik and Renzini, Alvio and Lilly, Simon and Carollo, Marcella and Kovač, Katarina and Ilbert, Olivier and Schinnerer, Eva and Fu, Hai and Tresse, Laurence and Griffiths, Richard E. and Civano, Francesca (2015) Discovery of Massive, Mostly Star Formation Quenched Galaxies with Extremely Large Lyα Equivalent Widths at z ~ 3. Astrophysical Journal Letters, 809 (1). Art. No. L7. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20150903-140209397
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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 EW_0 (Lyα) ~ 100–300 Å, (2) M_★ ~ 10^(10.5)–10^(11.1) 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.
|Alternate Title:||Discovery of Massive, Mostly Star-formation Quenched Galaxies with Extremely Large Lyman-alpha Equivalent Widths at z ~ 3|
|Additional Information:||© 2015 American Astronomical Society. Received 2015 May 25; accepted 2015 July 14; published 2015 August 5. We would like to thank both the Subaru and HST staff for their invaluable help, as well as all members of the COSMOS team. We would also like to thank the anonymous referee for valuable suggestions and comments. We also thank Alex Hagen for kindly providing us with the information of their LAEs. This work was financially supported in part by JSPS (Y. T.: 15340059, 17253001, 19340046, and 23244031; T.N.: 23654068 and 25707010). Data analysis was in part carried out on the common use data analysis computer system at the Astronomy Data Center, ADC, of the National Astronomical Observatory of Japan.|
|Subject Keywords:||cosmology: observations; early universe; galaxies: evolution; galaxies: formation; galaxies: high-redshift|
|Official Citation:||Discovery of Massive, Mostly Star Formation Quenched Galaxies with Extremely Large Lyα Equivalent Widths at z ~ 3 Yoshiaki Taniguchi et al. 2015 ApJ 809 L7|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||03 Sep 2015 22:34|
|Last Modified:||03 Sep 2015 22:34|
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