Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions
We report the detection of the millimeter CH _3 OH masers including a new detection of class I (11 _0,11 –10 _1,10 A) and class II (6 _1,5 –5 _2,4 E) maser transitions toward the high-mass protostar S255IR NIRS3 in postburst phase. The CH _3 OH emissions were detected as a mixture of maser and therm...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/acef1d |
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| author | Giseon Baek Jeong-Eun Lee Neal J. Evans II Tomoya Hirota Yuri Aikawa Ji-hyun Kang Jungha Kim Jes K. Jørgensen |
| author_facet | Giseon Baek Jeong-Eun Lee Neal J. Evans II Tomoya Hirota Yuri Aikawa Ji-hyun Kang Jungha Kim Jes K. Jørgensen |
| author_sort | Giseon Baek |
| collection | DOAJ |
| description | We report the detection of the millimeter CH _3 OH masers including a new detection of class I (11 _0,11 –10 _1,10 A) and class II (6 _1,5 –5 _2,4 E) maser transitions toward the high-mass protostar S255IR NIRS3 in postburst phase. The CH _3 OH emissions were detected as a mixture of maser and thermal characteristics. We examine the detected transitions using an excitation diagram and local thermodynamic equilibrium model spectra and compare the observed properties with those of thermal lines. Class II CH _3 OH maser transitions showed distinctive intensity and velocity distributions from those of thermal transitions. Bright, distinct emission components in addition to the fragmented and arc-shaped emissions are only detected in class I CH _3 OH maser transitions toward southern and western directions from the protostellar position, implying the presence of the slow outflow shocks. |
| first_indexed | 2024-03-12T11:22:14Z |
| format | Article |
| id | doaj.art-b80ebbcef21044a38cdce7215824794c |
| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-12T11:22:14Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj.art-b80ebbcef21044a38cdce7215824794c2023-09-01T16:42:13ZengIOP PublishingThe Astrophysical Journal Letters2041-82052023-01-019541L2510.3847/2041-8213/acef1dSpectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser TransitionsGiseon Baek0https://orcid.org/0000-0002-2814-1978Jeong-Eun Lee1https://orcid.org/0000-0003-3119-2087Neal J. Evans II2https://orcid.org/0000-0001-5175-1777Tomoya Hirota3https://orcid.org/0000-0003-1659-095XYuri Aikawa4https://orcid.org/0000-0003-3283-6884Ji-hyun Kang5https://orcid.org/0000-0001-7379-6263Jungha Kim6https://orcid.org/0000-0002-9933-2851Jes K. Jørgensen7https://orcid.org/0000-0001-9133-8047Department of Physics and Astronomy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea; Research Institute of Basic Sciences, Seoul National University , Seoul 08826, Republic of KoreaDepartment of Physics and Astronomy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea; SNU Astronomy Research Center, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of KoreaDepartment of Astronomy, The University of Texas at Austin , 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USAMizusawa VLBI Observatory, National Astronomical Observatory of Japan , Osawa 2-21-1, Mitaka-shi, Tokyo 181-8588, Japan; Department of Astronomical Sciences, SOKENDAI (The Graduate University for Advanced Studies) , Osawa 2-21-1, Mitaka-shi, Tokyo 181-8588, JapanDepartment of Astronomy, Graduate School of Science, University of Tokyo , Tokyo 113-0033, JapanKorea Astronomy and Space Science Institute , 776 Daedeok-daero, Yuseong, Daejeon 34055, Republic of KoreaKorea Astronomy and Space Science Institute , 776 Daedeok-daero, Yuseong, Daejeon 34055, Republic of KoreaNiels Bohr Institute, University of Copenhagen , Copenhagen K., DenmarkWe report the detection of the millimeter CH _3 OH masers including a new detection of class I (11 _0,11 –10 _1,10 A) and class II (6 _1,5 –5 _2,4 E) maser transitions toward the high-mass protostar S255IR NIRS3 in postburst phase. The CH _3 OH emissions were detected as a mixture of maser and thermal characteristics. We examine the detected transitions using an excitation diagram and local thermodynamic equilibrium model spectra and compare the observed properties with those of thermal lines. Class II CH _3 OH maser transitions showed distinctive intensity and velocity distributions from those of thermal transitions. Bright, distinct emission components in addition to the fragmented and arc-shaped emissions are only detected in class I CH _3 OH maser transitions toward southern and western directions from the protostellar position, implying the presence of the slow outflow shocks.https://doi.org/10.3847/2041-8213/acef1dProtostarsStar formationMassive starsMasers |
| spellingShingle | Giseon Baek Jeong-Eun Lee Neal J. Evans II Tomoya Hirota Yuri Aikawa Ji-hyun Kang Jungha Kim Jes K. Jørgensen Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions The Astrophysical Journal Letters Protostars Star formation Massive stars Masers |
| title | Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions |
| title_full | Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions |
| title_fullStr | Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions |
| title_full_unstemmed | Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions |
| title_short | Spectral Survey of a Hot Core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The Discovery of Class I and II Millimeter Methanol Maser Transitions |
| title_sort | spectral survey of a hot core with an eruptive accretion in s255ir nirs3 shea the discovery of class i and ii millimeter methanol maser transitions |
| topic | Protostars Star formation Massive stars Masers |
| url | https://doi.org/10.3847/2041-8213/acef1d |
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