The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars
Some optically selected quasars exhibit Mg ii- associated absorption lines (AALs), and their origin remains unclear. In this paper, we compile a sample of 1769 quasars, with or without Mg ii AALs, of which 1689 are far-infrared (FIR) detected quasars and the rest are not detected in FIR. For the FIR...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adbf1c |
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| author | Zhe-Geng Chen Rui-Jing Lu Zhi-Fu Chen Wen-Qiang Liang Xing-Long Peng Jing Li Wei-Rong Huang |
| author_facet | Zhe-Geng Chen Rui-Jing Lu Zhi-Fu Chen Wen-Qiang Liang Xing-Long Peng Jing Li Wei-Rong Huang |
| author_sort | Zhe-Geng Chen |
| collection | DOAJ |
| description | Some optically selected quasars exhibit Mg ii- associated absorption lines (AALs), and their origin remains unclear. In this paper, we compile a sample of 1769 quasars, with or without Mg ii AALs, of which 1689 are far-infrared (FIR) detected quasars and the rest are not detected in FIR. For the FIR undetected quasars, we obtain stacks for both with and without Mg ii AAL quasars. Then, we estimate the star formation rates (SFRs) within quasar host galaxies based on their FIR luminosities derived from their FIR graybody components, and find that, although quasars with Mg ii AALs have significantly redder median composite spectra than those without Mg ii AALs, the SFR distributions of the two types of quasars are statistically indistinguishable. These results do not require an evolutionary link between the quasars with and without Mg ii AALs, and would be reconciled if an orientation effect cannot be ignored among the quasars hosting different types of absorption lines. |
| format | Article |
| id | doaj-art-9236c2b9d4ca4a61bb90ae5607e12ff5 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-9236c2b9d4ca4a61bb90ae5607e12ff52025-08-20T01:51:48ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198315210.3847/1538-4357/adbf1cThe Infrared Traced Star Formation Rates of Associated Absorption Lines QuasarsZhe-Geng Chen0https://orcid.org/0009-0005-1367-9088Rui-Jing Lu1https://orcid.org/0000-0003-2467-3608Zhi-Fu Chen2https://orcid.org/0000-0003-0639-1148Wen-Qiang Liang3https://orcid.org/0009-0001-3122-3237Xing-Long Peng4Jing Li5https://orcid.org/0009-0001-4875-1079Wei-Rong Huang6https://orcid.org/0000-0001-8449-6020Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People’s Republic of China ; luruijing@gxu.edu.cn; School of Physics and Electronic Information, Guangxi Minzu University , Nanning 530006, People’s Republic of ChinaGuangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People’s Republic of China ; luruijing@gxu.edu.cnSchool of Physics and Electronic Information, Guangxi Minzu University , Nanning 530006, People’s Republic of ChinaGuangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People’s Republic of China ; luruijing@gxu.edu.cnSchool of Physics and Electronic Information, Guangxi Minzu University , Nanning 530006, People’s Republic of ChinaGuangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People’s Republic of China ; luruijing@gxu.edu.cnSchool of Physics and Electronic Information, Guangxi Minzu University , Nanning 530006, People’s Republic of ChinaSome optically selected quasars exhibit Mg ii- associated absorption lines (AALs), and their origin remains unclear. In this paper, we compile a sample of 1769 quasars, with or without Mg ii AALs, of which 1689 are far-infrared (FIR) detected quasars and the rest are not detected in FIR. For the FIR undetected quasars, we obtain stacks for both with and without Mg ii AAL quasars. Then, we estimate the star formation rates (SFRs) within quasar host galaxies based on their FIR luminosities derived from their FIR graybody components, and find that, although quasars with Mg ii AALs have significantly redder median composite spectra than those without Mg ii AALs, the SFR distributions of the two types of quasars are statistically indistinguishable. These results do not require an evolutionary link between the quasars with and without Mg ii AALs, and would be reconciled if an orientation effect cannot be ignored among the quasars hosting different types of absorption lines.https://doi.org/10.3847/1538-4357/adbf1cActive galaxies |
| spellingShingle | Zhe-Geng Chen Rui-Jing Lu Zhi-Fu Chen Wen-Qiang Liang Xing-Long Peng Jing Li Wei-Rong Huang The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars The Astrophysical Journal Active galaxies |
| title | The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars |
| title_full | The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars |
| title_fullStr | The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars |
| title_full_unstemmed | The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars |
| title_short | The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars |
| title_sort | infrared traced star formation rates of associated absorption lines quasars |
| topic | Active galaxies |
| url | https://doi.org/10.3847/1538-4357/adbf1c |
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