5 cm OH Masers in Northern Star Formation Regions
We present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6030 MHz, and five at 6035 MHz). Of these 44 detected 6.0 GHz...
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IOP Publishing
2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/ad9002 |
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| author | Hai-Hua Qiao Xu-Jia Ouyang Zhi-Qiang Shen Shari L. Breen Kai Yang Xi Chen Juan Li |
| author_facet | Hai-Hua Qiao Xu-Jia Ouyang Zhi-Qiang Shen Shari L. Breen Kai Yang Xi Chen Juan Li |
| author_sort | Hai-Hua Qiao |
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| description | We present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6030 MHz, and five at 6035 MHz). Of these 44 detected 6.0 GHz OH masers, 13 sites exhibit 6030 MHz OH masers, all 44 sites show the 6035 MHz transition, one site (G009.620+0.194) has the only 6016 MHz OH maser, and one site (W3(OH)) shows the only 6049 MHz OH maser. The 6016 MHz OH maser is the first OH maser of this transition detected in star formation regions. Investigations of the association between 6030/6035 MHz OH masers with 1665 MHz ground-state OH, 6.7 GHz methanol, and 22 GHz water masers show that 1665 MHz OH masers are good indicators of 6.0 GHz OH masers (29% detection rate), which is consistent with previous results. The majority (more than 77%) of 6030 and 6035 MHz OH masers are associated with 6.7 GHz methanol and/or 22 GHz water masers. Comparison between our spectra with previous spectra, we find that only two sources remain fairly stable since their discoveries. We identify 80 Zeeman pairs in 32 6.0 GHz OH maser sites with typical magnetic field strengths of less than 10 mG. The magnetic field directions derived from these 32 maser sites with Zeeman pairs are consistent with previous work, which indicates that the 6.0 GHz OH masers may be potential tracers of the large-scale Galactic magnetic field. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-51f60e44018c456993f5a894c2d397c32024-12-09T13:32:23ZengIOP PublishingThe Astronomical Journal1538-38812024-01-0116911210.3847/1538-3881/ad90025 cm OH Masers in Northern Star Formation RegionsHai-Hua Qiao0https://orcid.org/0000-0003-0196-4701Xu-Jia Ouyang1https://orcid.org/0000-0002-2762-6519Zhi-Qiang Shen2https://orcid.org/0000-0003-3540-8746Shari L. Breen3https://orcid.org/0000-0002-4047-0002Kai Yang4https://orcid.org/0000-0002-9839-185XXi Chen5https://orcid.org/0000-0002-5435-925XJuan Li6https://orcid.org/0000-0003-3520-6191National Time Service Center, Chinese Academy of Sciences , Xi’An, Shaanxi 710600, People's Republic of China ; qiaohh@ntsc.ac.cn; Key Laboratory of Time Reference and Applications, Chinese Academy of Sciences , People's Republic of China; Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People's Republic of China School of Physics and Astronomy, Sun Yat-sen University , 2 Daxue Road, Tangjia, Zhuhai, Guangdong Province, People's Republic of ChinaShanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People's Republic of China ; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , People's Republic of ChinaSKA Observatory , Jodrell Bank, Lower Withington, Macclesfield, SK11 9FT, UKSchool of Astronomy and Space Science, Nanjing University , 163 Xianlin Avenue, Nanjing 210023, People's Republic of ChinaShanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People's Republic of China ; Center for Astrophysics, Guangzhou University , Guangzhou 510006, People's Republic of ChinaShanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People's Republic of China ; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , People's Republic of ChinaWe present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6030 MHz, and five at 6035 MHz). Of these 44 detected 6.0 GHz OH masers, 13 sites exhibit 6030 MHz OH masers, all 44 sites show the 6035 MHz transition, one site (G009.620+0.194) has the only 6016 MHz OH maser, and one site (W3(OH)) shows the only 6049 MHz OH maser. The 6016 MHz OH maser is the first OH maser of this transition detected in star formation regions. Investigations of the association between 6030/6035 MHz OH masers with 1665 MHz ground-state OH, 6.7 GHz methanol, and 22 GHz water masers show that 1665 MHz OH masers are good indicators of 6.0 GHz OH masers (29% detection rate), which is consistent with previous results. The majority (more than 77%) of 6030 and 6035 MHz OH masers are associated with 6.7 GHz methanol and/or 22 GHz water masers. Comparison between our spectra with previous spectra, we find that only two sources remain fairly stable since their discoveries. We identify 80 Zeeman pairs in 32 6.0 GHz OH maser sites with typical magnetic field strengths of less than 10 mG. The magnetic field directions derived from these 32 maser sites with Zeeman pairs are consistent with previous work, which indicates that the 6.0 GHz OH masers may be potential tracers of the large-scale Galactic magnetic field.https://doi.org/10.3847/1538-3881/ad9002Interstellar masersCatalogsStar formationInterstellar molecules |
| spellingShingle | Hai-Hua Qiao Xu-Jia Ouyang Zhi-Qiang Shen Shari L. Breen Kai Yang Xi Chen Juan Li 5 cm OH Masers in Northern Star Formation Regions The Astronomical Journal Interstellar masers Catalogs Star formation Interstellar molecules |
| title | 5 cm OH Masers in Northern Star Formation Regions |
| title_full | 5 cm OH Masers in Northern Star Formation Regions |
| title_fullStr | 5 cm OH Masers in Northern Star Formation Regions |
| title_full_unstemmed | 5 cm OH Masers in Northern Star Formation Regions |
| title_short | 5 cm OH Masers in Northern Star Formation Regions |
| title_sort | 5 cm oh masers in northern star formation regions |
| topic | Interstellar masers Catalogs Star formation Interstellar molecules |
| url | https://doi.org/10.3847/1538-3881/ad9002 |
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