ALMA Confirmation of Millimeter Time Variability in the Gamma-Ray Detected Seyfert Galaxy GRS 1734-292
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Michiyama, Tomonari Inoue, Yoshiyuki Doi, Akihiro Yamada, Tomoya Fukazawa, Yasushi Kubo, Hidetoshi Barnie, Samuel |
| author_facet | Michiyama, Tomonari Inoue, Yoshiyuki Doi, Akihiro Yamada, Tomoya Fukazawa, Yasushi Kubo, Hidetoshi Barnie, Samuel |
| contents | GRS 1734-292 is a radio-quiet galaxy, exhibiting neither intense starburst nor jet activities. However, Fermi-LAT detected this object in the GeV band. The origin of non-thermal activity in this Seyfert galaxy is an intriguing question. We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of GRS 1734-292 at frequencies of 97.5, 145, and 225 GHz. These observations confirmed the millimeter excess within the central <100 pc region and its time variability based on two separate observations conducted four days apart. The timescale of variability aligns with the light crossing time for a compact source smaller than <100 Schwarzschild radius. If we take into account the power-law synchrotron emission originating from the corona (i.e., the hot plasma located above the accretion disk), the millimeter spectrum indicates the coronal magnetic field of ~10 G and the size of ~10 Schwarzschild radius. An alternative explanation for this millimeter emission could be synchrotron and free-free emission from disk winds (i.e., fast wide-opening angle outflows from the disk) with the size of ~10 pc, although it may be difficult to explain the fast variability. Future millimeter observations with higher resolution (~0.01") will enable the differentiation between these two scenarios. Such observations will provide insights into the acceleration sites of high-energy particles at the core of active galactic nuclei. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_00647 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | ALMA Confirmation of Millimeter Time Variability in the Gamma-Ray Detected Seyfert Galaxy GRS 1734-292 Michiyama, Tomonari Inoue, Yoshiyuki Doi, Akihiro Yamada, Tomoya Fukazawa, Yasushi Kubo, Hidetoshi Barnie, Samuel Astrophysics of Galaxies High Energy Astrophysical Phenomena GRS 1734-292 is a radio-quiet galaxy, exhibiting neither intense starburst nor jet activities. However, Fermi-LAT detected this object in the GeV band. The origin of non-thermal activity in this Seyfert galaxy is an intriguing question. We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of GRS 1734-292 at frequencies of 97.5, 145, and 225 GHz. These observations confirmed the millimeter excess within the central <100 pc region and its time variability based on two separate observations conducted four days apart. The timescale of variability aligns with the light crossing time for a compact source smaller than <100 Schwarzschild radius. If we take into account the power-law synchrotron emission originating from the corona (i.e., the hot plasma located above the accretion disk), the millimeter spectrum indicates the coronal magnetic field of ~10 G and the size of ~10 Schwarzschild radius. An alternative explanation for this millimeter emission could be synchrotron and free-free emission from disk winds (i.e., fast wide-opening angle outflows from the disk) with the size of ~10 pc, although it may be difficult to explain the fast variability. Future millimeter observations with higher resolution (~0.01") will enable the differentiation between these two scenarios. Such observations will provide insights into the acceleration sites of high-energy particles at the core of active galactic nuclei. |
| title | ALMA Confirmation of Millimeter Time Variability in the Gamma-Ray Detected Seyfert Galaxy GRS 1734-292 |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2404.00647 |