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Characteristics of mid-infrared PAH emission from star-forming galaxies selected at 250 μm in the North Ecliptic Pole field

Kim, Seong Jin; Jeong, Woong-Seob; Goto, Tomotsugu; Lee, Hyung Mok; Shim, Hyunjin; Pearson, Chris; Im, Myungshin; Matsuhara, Hideo; Seo, Hyunjong; Hashimoto, Tetsuya; Kim, Minjin; Chiang, Chia-Ying; Barrufet, Laia and Varillas, Maria del Carmen Campos (2019). Characteristics of mid-infrared PAH emission from star-forming galaxies selected at 250 μm in the North Ecliptic Pole field. Publications of the Astronomical Society of Japan, 71(1), article no. 11.

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Evolutionary properties of infrared (IR) luminous galaxies are important keys to understand dust-obscured star formation history and galaxy evolution. Based on near- to mid-IR imaging with nine continuous filters of the AKARI space telescope, we present the characteristics of dusty star-forming (SF) galaxies showing polycyclic aromatic hydrocarbon (PAH) features observed by the North Ecliptic Pole (NEP) wide field survey of AKARI and Herschel. All the sample galaxies from the AKARI/NEP-Wide data are selected based both on the Herschel/SPIRE 250 μm detection and optical spectroscopic redshift data. The physical modeling of spectral energy distribution (SED) using all available data points from u* to sub-mm 500 μm band, including WISE and PACS data where available, takes unique advantages of the continuous near- to mid-IR coverage, the reliable constraint on the far-IR peak, and spectroscopically determined accurate redshifts, as well as the energy balance principle by MAGPHYS. This enables us to derive physically meaningful and accurate total infrared luminosity and 8 μm (or PAH) luminosity consistently. Our sample galaxies are in the redshift range z < 1, and the majority of them appear to be normal SF/spiral populations showing PAH features near 8 μm. These SF galaxies showing PAHs in the mid-IR include various types, from quiescent to starbursts. Some of our sample show shortage of 8 μm luminosity compared to the total IR luminosity and this PAH deficit gets severe in more-luminous IR galaxies, suggesting PAH molecules in these galaxies are destroyed by a strong radiation field from the SF region or a large amount of cold dust in the interstellar medium. The specific SFR of our sample shows mass-dependent time evolution which is consistent with a downsizing evolutionary pattern.

Item Type: Journal Item
Copyright Holders: 2018 Seong Jin Kim, 2018 Woong-Seob Jeong, 2018 Tomotsugu Goto, 2018 Hyung Mok Lee, 2018 Hyunjin Shim, 2018 Chris Pearson, 2018 Myungshin Im, 2018 Hideo Matsuhara, 2018 Hyunjong Seo, 2018 Tetsuya Hashimoto, 2018 Minjin Kim, 2018 Chia-Ying Chiang, 2018 Laia Barrufet, 2018 Maria del Carmen Campos Varillas
ISSN: 2053-051X
Keywords: cosmology; observations; infrared: galaxies; galaxies: evolution
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 58404
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 02 Jan 2019 10:28
Last Modified: 20 Jun 2019 04:51
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