Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission
MWC 349A is one of the rare stars known to have hydrogen radio recombination line (RRL) masers. The bright maser emission makes it possible to study the dynamics of the system at milliarcsecond (mas) precision. We present Atacama Large Millimeter/submillimeter Array observations of the 1.4 and 0.8 m...
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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/ace7ba |
| _version_ | 1797697142445309952 |
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| author | Sirina Prasad Qizhou Zhang James Moran Yue Cao Izaskun Jimenéz-Serra Jesus Martín-Pintado Antonio Martínez-Henares Alejandro Báez-Rubio |
| author_facet | Sirina Prasad Qizhou Zhang James Moran Yue Cao Izaskun Jimenéz-Serra Jesus Martín-Pintado Antonio Martínez-Henares Alejandro Báez-Rubio |
| author_sort | Sirina Prasad |
| collection | DOAJ |
| description | MWC 349A is one of the rare stars known to have hydrogen radio recombination line (RRL) masers. The bright maser emission makes it possible to study the dynamics of the system at milliarcsecond (mas) precision. We present Atacama Large Millimeter/submillimeter Array observations of the 1.4 and 0.8 mm continuum emission of MWC 349A, as well as the H30 α and H26 α RRLs. Using the most extended array configuration of C43-10 with a maximum baseline of 16.2 km, we spatially resolved the H30 α line and 1.4 mm continuum emission for the first time. In addition to the known H30 α and H26 α maser emission from a Keplerian disk at LSR velocities from −12 to 28 km s ^−1 and from an ionized wind for velocities between −12 to −40 km s ^−1 and 28 to 60 km s ^−1 , we found evidence of a jet along the polar axis at V _LSR from −85 to −40 km s ^−1 and +60 to +100 km s ^−1 . These masers are found in a linear structure nearly aligned with the polar axis of the disk. If these masers lie close to the polar axis, their velocities could be as high as 575 km s ^−1 , which cannot be explained solely by a single expanding wind as proposed in Báez-Rubio et al. We suggest that they originate from a high-velocity jet, likely launched by a magnetohydrodynamic wind. The jet appears to rotate in the same direction as the rotation of the disk. A detailed radiative transfer modeling of these emissions will further elucidate the origin of these masers in the wind. |
| first_indexed | 2024-03-12T03:36:02Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-12T03:36:02Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj.art-c699b397ba5d4309a41e51943ccade272023-09-03T13:13:49ZengIOP PublishingThe Astrophysical Journal Letters2041-82052023-01-019531L610.3847/2041-8213/ace7baDetection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser EmissionSirina Prasad0https://orcid.org/0000-0002-1082-5589Qizhou Zhang1https://orcid.org/0000-0003-2384-6589James Moran2https://orcid.org/0000-0002-3882-4414Yue Cao3https://orcid.org/0000-0002-6368-7570Izaskun Jimenéz-Serra4https://orcid.org/0000-0003-4493-8714Jesus Martín-Pintado5https://orcid.org/0000-0003-4561-3508Antonio Martínez-Henares6https://orcid.org/0000-0001-5191-2075Alejandro Báez-Rubio7Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACentro de Astrobiología (CSIC-INTA) , Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, SpainCentro de Astrobiología (CSIC-INTA) , Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, SpainCentro de Astrobiología (CSIC-INTA) , Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, SpainMahindra United World College , GHVM+7VM, Paud, Maharashtra 412108, IndiaMWC 349A is one of the rare stars known to have hydrogen radio recombination line (RRL) masers. The bright maser emission makes it possible to study the dynamics of the system at milliarcsecond (mas) precision. We present Atacama Large Millimeter/submillimeter Array observations of the 1.4 and 0.8 mm continuum emission of MWC 349A, as well as the H30 α and H26 α RRLs. Using the most extended array configuration of C43-10 with a maximum baseline of 16.2 km, we spatially resolved the H30 α line and 1.4 mm continuum emission for the first time. In addition to the known H30 α and H26 α maser emission from a Keplerian disk at LSR velocities from −12 to 28 km s ^−1 and from an ionized wind for velocities between −12 to −40 km s ^−1 and 28 to 60 km s ^−1 , we found evidence of a jet along the polar axis at V _LSR from −85 to −40 km s ^−1 and +60 to +100 km s ^−1 . These masers are found in a linear structure nearly aligned with the polar axis of the disk. If these masers lie close to the polar axis, their velocities could be as high as 575 km s ^−1 , which cannot be explained solely by a single expanding wind as proposed in Báez-Rubio et al. We suggest that they originate from a high-velocity jet, likely launched by a magnetohydrodynamic wind. The jet appears to rotate in the same direction as the rotation of the disk. A detailed radiative transfer modeling of these emissions will further elucidate the origin of these masers in the wind.https://doi.org/10.3847/2041-8213/ace7baStar formationCircumstellar disksAstrophysical masersJetsInterferometryEvolved stars |
| spellingShingle | Sirina Prasad Qizhou Zhang James Moran Yue Cao Izaskun Jimenéz-Serra Jesus Martín-Pintado Antonio Martínez-Henares Alejandro Báez-Rubio Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission The Astrophysical Journal Letters Star formation Circumstellar disks Astrophysical masers Jets Interferometry Evolved stars |
| title | Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission |
| title_full | Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission |
| title_fullStr | Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission |
| title_full_unstemmed | Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission |
| title_short | Detection of a High-velocity Jet from MWC 349A Traced by Hydrogen Recombination Line Maser Emission |
| title_sort | detection of a high velocity jet from mwc 349a traced by hydrogen recombination line maser emission |
| topic | Star formation Circumstellar disks Astrophysical masers Jets Interferometry Evolved stars |
| url | https://doi.org/10.3847/2041-8213/ace7ba |
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