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Mid-infrared PAH emission from star-forming galaxies selected at 250 μm

Published online by Cambridge University Press:  10 June 2020

Seong Jin Kim  and
AKARI NEP Collaboration
Seong Jin Kim
Affiliation:
National Tsing Hua University No. 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan email: [email protected]
AKARI NEP Collaboration
Affiliation:
National Tsing Hua University No. 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan email: [email protected]
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Abstract

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The infrared (IR) galaxies detected at Herschel/SPIRE 250 μm band over the AKARI’s NEP-Wide field are various types of dusty star-forming (SF) galaxies ranging from quiescent to starbursts, having mid-IR polycyclic aromatic hydrocarbon (PAH) features near 8 μm. The measurements of the 8 μm luminosity (L8μm) along with the total infrared luminosity (LIR) based on the physical modeling of SEDs a take unique advantage of the continuous near- to mid-IR coverage, far-IR data points, and spectroscopically determined accurate redshifts. Our sample shows shortage of 8 μm luminosity compared to the total IR luminosity. This deficit gets severe in more luminous IR galaxies, suggesting PAH molecules in these galaxies are destroyed by a strong radiation field from SF regions, or the existence of a unexpectedly large amount of cold dust in the ISM that contributes to LIR.

Keywords

galaxies: evolutioninfrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 281 - 282
Copyright
© International Astronomical Union 2020

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