%0 Generic %1 taniguchi2015discovery %A Taniguchi, Yoshiaki %A Kajisawa, Masaru %A Kobayashi, Masakazu A. R. %A Nagao, Tohru %A Shioya, Yasuhiro %A Scoville, Nick Z. %A Sanders, David B. %A Capak, Peter L. %A Koekemoer, Anton M. %A Toft, Sune %A McCracken, Henry J. %A Fevre, Olivier Le %A Tasca, Lidia %A Sheth, Kartik %A Renzini, Alvio %A Lilly, Simon %A Carollo, Marcella %A Kovac, Katarina %A Ilbert, Olivier %A Schinnerer, Eva %A Fu, Hai %A Tresse, Laurence %A Griffiths, Richard E. %A Civano, Francesca %D 2015 %K emission galaxy lya passive %T Discovery of Massive, Mostly Star-formation Quenched Galaxies with Extremely Large Lyman-alpha Equivalent Widths at z ~ 3 %U http://arxiv.org/abs/1507.04439 %X We report a discovery of 6 massive galaxies with both extremely large Lya equivalent width and evolved stellar population at z ~ 3. These MAssive Extremely STrong Lya emitting Objects (MAESTLOs) have been discovered in our large-volume systematic survey for strong Lya emitters (LAEs) with twelve optical intermediate-band data taken with Subaru/Suprime-Cam in the COSMOS field. Based on the SED fitting analysis for these LAEs, it is found that these MAESTLOs have (1) large rest-frame equivalent width of EW_0(Lya) ~ 100--300 A, (2) M_star ~ 10^10.5--10^11.1 M_sun, and (3) relatively low specific star formation rates of SFR/M_star ~ 0.03--1 Gyr^-1. Three of the 6 MAESTLOs have extended Ly$\alpha$ emission with a radius of several kpc 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 AGNs, the observed extended Lya emission is likely to be caused by 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.

@misc{taniguchi2015discovery, abstract = {We report a discovery of 6 massive galaxies with both extremely large Lya equivalent width and evolved stellar population at z ~ 3. These MAssive Extremely STrong Lya emitting Objects (MAESTLOs) have been discovered in our large-volume systematic survey for strong Lya emitters (LAEs) with twelve optical intermediate-band data taken with Subaru/Suprime-Cam in the COSMOS field. Based on the SED fitting analysis for these LAEs, it is found that these MAESTLOs have (1) large rest-frame equivalent width of EW_0(Lya) ~ 100--300 A, (2) M_star ~ 10^10.5--10^11.1 M_sun, and (3) relatively low specific star formation rates of SFR/M_star ~ 0.03--1 Gyr^-1. Three of the 6 MAESTLOs have extended Ly$\alpha$ emission with a radius of several kpc 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 AGNs, the observed extended Lya emission is likely to be caused by 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.}, added-at = {2015-07-17T09:51:15.000+0200}, author = {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 Fevre, Olivier Le and Tasca, Lidia and Sheth, Kartik and Renzini, Alvio and Lilly, Simon and Carollo, Marcella and Kovac, Katarina and Ilbert, Olivier and Schinnerer, Eva and Fu, Hai and Tresse, Laurence and Griffiths, Richard E. and Civano, Francesca}, biburl = {https://www.bibsonomy.org/bibtex/269e12ce4236f19745b6876e541620733/miki}, description = {[1507.04439] Discovery of Massive, Mostly Star-formation Quenched Galaxies with Extremely Large Lyman-alpha Equivalent Widths at z ~ 3}, interhash = {936e8e528a46ffe914e8010bc623f97d}, intrahash = {69e12ce4236f19745b6876e541620733}, keywords = {emission galaxy lya passive}, note = {cite arxiv:1507.04439Comment: Accepted for publication in ApJ Letters on 15th July, 2015. 6 pages including 3 figures and 2 tables}, timestamp = {2015-07-17T09:51:15.000+0200}, title = {Discovery of Massive, Mostly Star-formation Quenched Galaxies with Extremely Large Lyman-alpha Equivalent Widths at z ~ 3}, url = {http://arxiv.org/abs/1507.04439}, year = 2015 }