Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*
Open accessAbstract
We report the detection of linear polarization from Sgr A* at 750, 850, 1350, and 2000 µm which confirms the contribution of synchrotron radiation. From the lack of polarization at longer wavelengths, it appears to arise in the millimeter/submillimeter excess. There are large position angle changes between the millimeter and submillimeter results, and these are discussed in terms of a polarized dust contribution in the submillimeter and various synchrotron models. In the model that best explains the data, the synchrotron radiation from the excess is self-absorbed in the millimeter region and becomes optically thin in the submillimeter. This implies that the excess arises in an extremely compact source of approximately 2 Schwarzschild radii.
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Observations of polarization and its variability in mm, sub-mm, and near IR wavelengths within the central 0.1 pc of Sgr A* have been instrumental in determining the mass accretion rate of the SMBH.
“Observations of polarization and its variability in mm, sub-mm, and near IR wavelengths within the central 0 . 1 pc of the Sgr A ∗ have been instrumental in determining the mass accretion rate of the SMBH (Aitken et al. 2000; Marrone et al. 2007; Eckart et al. 2012; Brinkerink et al. 2016; Bower et al. 2018; Do et al. 2019; Michail et al. 2023).”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Aitken et al. 2000
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Marrone, D. P., Moran, J. M., Zhao, J.-H., & Rao, R. (2007) · The Astrophysical Journal · doi:10.1086/510850 · Cited by 298 · see citing works
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Self-citationOn the Nature of the Variable Infrared Emission from Sagittarius A*
Yuan, F., Quataert, E., & Narayan, R. (2004) · The Astrophysical Journal · doi:10.1086/383117 · Cited by 183 · see citing works
The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way
Sarkar, K. C. (2024) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-024-00152-1 · Cited by 34 · see citing works
“Although the observed rate of TDEs in the local universe is ∼ 1 − 6 × 10 − 5 yr − 1 galaxy − 1 (Donley et al. 2002; Gezari et al. 2008; Yao et al. 2023), the expected rate for MW type SMBH is ∼ 0 .”
BackgroundInfluentialHsieh, P.-Y., Koch, P. M., Kim, W.-T., Ho, P. T. P., Tang, Y.-W., & Wang, H.-H. (2018) · The Astrophysical Journal · doi:10.3847/1538-4357/aacb27 · Cited by 33 · see citing works
- Authors
- Aitken, D. K., Greaves, J., Chrysostomou, A., Jenness, T., Holland, W., Hough, J. H., Pierce-Price, D., & Richer, J.
- Affiliations
- University of Hertfordshire (GB)
- University of Hawaii at Hilo (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2000-05-10
- Volume
- 534
- Issue
- 2
- Pages
- L173-L176
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2086403458
- Cited by
- 180
- References
- 0
- Citations by year
- 2025: 3 · 2024: 5 · 2023: 3 · 2022: 1 · 2021: 6 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 2 · 2016: 9 · 2015: 6 · 2014: 8 · 2013: 4 · 2012: 7
- FWCI
- 12.63
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Centre for Supercomputing Applications
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Astrophysics and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Pulsars and Gravitational Waves Research
- Keywords
- Sgr A*, linear polarization, millimeter-wave emission, submillimeter emission, synchrotron radiation, self-absorption, compact radio sources, Galactic Center
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