Dust-obscured Galaxies with Broken Power-law Spectral Energy Distributions Discovered by UNIONS

2025/04/21 by Taketo Yoshida, Yoshida, Taketo, Tohru Nagao +25 · 1 voice
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #astro-ph.GA

paper · pdf · doi:10.48550/arxiv.2504.15023

arxiv published 2025/04/21 · arxiv updated 2025/05/15

Abstract

We report on the spectral energy distributions (SEDs) of infrared-bright dust-obscured galaxies (DOGs) with (i - [22])_{\rm AB} ≥ 7.0. Using photometry from the deep and wide Ultraviolet Near-Infrared Optical Northern Survey, combined with near-IR and mid-IR data from the UKIRT Infrared Deep Sky Survey and the Wide-field Infrared Survey Explorer, we successfully identified 382 DOGs in ∼ 170 deg². Among them, the vast majority (376 DOGs) were classified into two subclasses: bump DOGs (132/376) and power-law (PL) DOGs (244/376), which are dominated by star formation and active galactic nucleus (AGN), respectively. Through the SED analysis, we found that roughly half (120/244) of the PL DOGs show ``broken'' power-law SEDs. The significant red slope from optical to near-IR in the SEDs of these ``broken power-law DOGs'' (BPL DOGs) probably reflects their large amount of dust extinction. In other words, BPL DOGs are more heavily obscured AGNs, compared to PL DOGs with non-broken power-law SEDs.

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Discussions

• "We report on the spectral energy distributions (SEDs) of infrared-bright dust-obscured galaxies (DOGs) ... The significant red slope from optical to near-IR in the SEDs of these `'broken power-law DO [bsky, 0 points, 0 comments]

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