ASCA Discovery of Diffuse 6.4 keV Emission near the Sagittarius C Complex: A New X‐Ray Reflection Nebula
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We present an ASCA discovery of diffuse hard X-ray emission from the Sgr C complex with its peak in the vicinity of the molecular cloud core. The X-ray spectrum is characterized by a strong 6.4 keV line and large absorption. These properties suggest that Sgr C is a new X-ray reflection nebula that emits fluorescent and scattered X-rays via irradiation from an external X-ray source. We found no adequately bright source in the immediate Sgr C vicinity to fully account for the fluorescence. The irradiating source may be the Galactic nucleus Sgr A*, which was brighter in the past than it is now, as is suggested from observations of the first X-ray reflection nebula Sgr B2.
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Observations of fluorescent Fe Kα line (at ≈6.4 keV) in several molecular clouds around Sgr A* indicate an X-ray luminosity LX~10^39 erg/s (mechanical luminosity 10^41-42 erg/s).
“Observations of fluorescent Fe K α line (at ≈ 6 . 4 keV) in several molecular clouds (including at Sgr B2 and Sgr C cloud complexes) around Sgr A ∗ indicates an X-ray luminosity of LX ∼ 10 39 erg s -1 (mechanical luminosity of 10 41 -42 erg s -1 ) (Koyama et al. 1996; Murakami et al. 2001; Inui et al. 2009).”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Murakami et al. 2001
The assumed wind power is consistent with the X-ray reflection nebulae constraints.
“The assumed wind power is consistent with the X-ray reflection nebulae constraints (section 3.3; Koyama et al. 1996; Murakami et al. 2001; Inui et al. 2009).”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Murakami et al. 2001
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“4 keV) in several molecular clouds (including at Sgr B2 and Sgr C cloud complexes) around Sgr A ∗ indicates an X-ray luminosity of L X ∼ 10 39 erg s − 1 (mechanical luminosity of 10 41 − 42 erg s − 1 ) (Koyama et al. 1996; Murakami et al. 2001; Inui et al. 2009).”
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Self-citation
- Authors
- Murakami, H., Koyama, K., Tsujimoto, M., Maeda, Y., & Sakano, M.
- Affiliations
- Japan Society for the Promotion of Science (JP)
- Kyoto University (JP)
- Pennsylvania State University (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2001-03-20
- Volume
- 550
- Issue
- 1
- Pages
- 297-300
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2124572456
- Cited by
- 59
- References
- 11
- Citations by year
- 2025: 1 · 2024: 1 · 2021: 1 · 2017: 3 · 2016: 5 · 2015: 2 · 2014: 3 · 2013: 5 · 2012: 2
- FWCI
- 3.87
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Astrophysics and Cosmic Phenomena
- Keywords
- X-ray fluorescence, X-ray absorption, molecular clouds, Sgr A*, Sgr B2, ASCA
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