ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays?
Abstract
Detailed X-ray images and spectra of the galactic-center region up to 10 keV were obtained with ASCA. Diffuse thermal-emission with distinct Kα lines from highly ionized ions of various elements has confirmed the presence of an extended high-temperature plasma. The fluorescent X-ray emission from cold iron atoms in molecular clouds was also found, possibly due to irradiation by X-rays from the center, which was bright in the past, but is presently dim. The results suggest that the galactic center exhibited intermittent activities with a time-averaged energy generation rate comparable to Seyfert nuclei, a class of active galactic nuclei.
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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 Koyama et al. 1996
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 Koyama et al. 1996
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Cited by 435
- Authors
- Koyama, K., Maeda, Y., Sonobe, T., Takeshima, T., Tanaka, Y., & Yamauchi, S.
- Affiliations
- Kyoto University (JP)
- Institute of Space and Astronautical Science (JP)
- Goddard Space Flight Center (US)
- Max Planck Institute for Extraterrestrial Physics (DE)
- Iwate University (JP)
- Venue
- Publications of the Astronomical Society of Japan
- Publisher
- Oxford University Press (OUP)
- Published
- 1996-04-01
- Volume
- 48
- Issue
- 2
- Pages
- 249-255
- ISSN
- 0004-6264 (ISSN-L)
- 2053-051X
- OpenAlex
- W2032372224
- Cited by
- 435
- References
- 0
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 14 · 2023: 5 · 2022: 10 · 2021: 12 · 2020: 13 · 2019: 12 · 2018: 5 · 2017: 11 · 2016: 19 · 2015: 17 · 2014: 18 · 2013: 26 · 2012: 17
- FWCI
- 12.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Publications of the Astronomical Society of Japan (publishedVersion)
- 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 › Galaxies: Formation, Evolution, Phenomena
- Keywords
- Galactic Center, X-ray emission, highly ionized plasma, molecular clouds, iron K-alpha line, high-temperature plasma, Seyfert nuclei, active galactic nuclei, ASCA observations
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