HINOTORI I: The nature of rejuvenation galaxies

Author:

Tanaka Takumi S123ORCID,Shimasaku Kazuhiro14,Tacchella Sandro56ORCID,Ando Makoto1ORCID,Ito Kei1ORCID,Yesuf Hassen M27,Matsui Suin1

Affiliation:

1. Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan

2. Kavli Institute for the Physics and Mathematics of the Universe (WPI),The University of Tokyo Institutes for Advanced Study, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 , Japan

3. Center for Data-Driven Discovery, Kavli IPMU (WPI), UTIAS, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 , Japan

4. Research Center for the Early Universe, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan

5. Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA , UK

6. Cavendish Laboratory, University of Cambridge , 19 JJ Thomson Avenue, Cambridge CB3 0HE , UK

7. Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871 , People’s Republic of China

Abstract

Abstract We present the HINOTORI (Star Formation History Investigation To Find Rejuvenation) project to reveal the nature of rejuvenation galaxies (RGs), which are galaxies that restarted their star formation after being quiescent. As the first step of HINOTORI, we construct the largest RG sample with 1071 sources. We select these RGs from 8857 MaNGA (Mapping Nearby Galaxies at APO) survey galaxies by reconstructing their star formation histories with the Prospector spectral energy distribution fitting code. Both optical spectral data and UV to IR photometric data are used for the fitting. Using mock data, we confirm that our method can detect weak rejuvenation events that form only about $0.1$% of the total stellar mass with high completeness. The RGs account for ${\sim}10$% of the whole sample, and rejuvenation events contribute on average only about $0.1$% of the total stellar mass in those galaxies but $17$% of the cosmic star formation rate density today. Our RGs have a similar mass distribution to quiescent galaxies (QGs). However, the morphology of the RGs is more disk-like than QGs, suggesting that rejuvenation may occur selectively in disk-like QGs. Our results also suggest the possibility of multiple-time rejuvenation events in a single galaxy. Further spatially resolved analyses of integral field unit data and radio observations and comparisons to simulations are needed to identify the mechanism and the role of rejuvenation in galaxy evolution.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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