Dust-obscured Galaxies with Broken Power-law Spectral Energy Distributions Discovered by UNIONS
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Yoshida, Taketo Nagao, Tohru Toba, Yoshiki Noboriguchi, Akatoki Ichikawa, Kohei Hildebrandt, Hendrik Yutani, Naomichi Chambers, Kenneth C. Iwamoto, Ryo Kobayashi, Seira Oguri, Masamune Osato, Ken Shibata, Kohei Zhong, Yuxing |
| author_facet | Yoshida, Taketo Nagao, Tohru Toba, Yoshiki Noboriguchi, Akatoki Ichikawa, Kohei Hildebrandt, Hendrik Yutani, Naomichi Chambers, Kenneth C. Iwamoto, Ryo Kobayashi, Seira Oguri, Masamune Osato, Ken Shibata, Kohei Zhong, Yuxing |
| contents | We report on the spectral energy distributions (SEDs) of infrared-bright dust-obscured galaxies (DOGs) with $(i - [22])_{\rm AB} \geq 7.0$. 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 $\sim$ 170 deg$^2$. 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_15023 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dust-obscured Galaxies with Broken Power-law Spectral Energy Distributions Discovered by UNIONS Yoshida, Taketo Nagao, Tohru Toba, Yoshiki Noboriguchi, Akatoki Ichikawa, Kohei Hildebrandt, Hendrik Yutani, Naomichi Chambers, Kenneth C. Iwamoto, Ryo Kobayashi, Seira Oguri, Masamune Osato, Ken Shibata, Kohei Zhong, Yuxing Astrophysics of Galaxies We report on the spectral energy distributions (SEDs) of infrared-bright dust-obscured galaxies (DOGs) with $(i - [22])_{\rm AB} \geq 7.0$. 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 $\sim$ 170 deg$^2$. 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. |
| title | Dust-obscured Galaxies with Broken Power-law Spectral Energy Distributions Discovered by UNIONS |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.15023 |