MAXI/SSC all-sky maps from 0.7 keV to 4 keV
Open accessAbstract
By accumulating data from the Solid-state Slit Camera (SSC) on board the MAXI mission from 2009 to 2011, diffuse X-ray background maps were obtained in energies of 0.7–1.0, 1.0–2.0, and 2.0–4.0 keV. They are the first to be derived with a solid-state instrument, and to be compared with the previous ROSAT all-sky survey result. While the SSC map in the highest energy band is dominated by point sources and the Galactic diffuse X-ray emission, that in 0.7–1.0 keV reveals an extended X-ray structure, of which the brightness distribution is very similar to that observed with ROSAT about 20 years before. As in the ROSAT result, the emission is dominated by a bright arc-like structure, which appears to be part of a circle of ∼50° radius centered at about (l,b) ∼ (340°, 15°). In addition, the SSC map suggests a fainter and larger ellipse, which is elongated in the north–south direction and roughly centered at the Galactic center. The spectrum of these structures is explained as thin thermal emission from a plasma, with a temperature of ∼0.31 keV and an abundance of ∼0.3 solar. Based on SSC observation conditions including low solar activity, the solar wind charge exchange signals are estimated to be negligible in the present SSC maps, as well as in the >0.56 keV ROSAT map. A brief discussion is given on the results obtained.
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High-sensitivity X-ray telescopes eROSITA and MAXI have detected the southern counterpart of the NPS, known as the eROSITA bubbles.
“It was only very recently that the high-sensitivity X-ray telescopes, such as eROSITA (Predehl et al. 2021) and MAXI , have been able to detect the southern counterpart of the NPS, known as the eROSITA bubbles (Predehl et al. 2020; Nakahira et al. 2020).”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Nakahira et al. 2020
Section 5.2 reports that MAXI/SSC detected a faint southern X-ray feature and describes the extended structure as approximately north–south symmetric, supporting the southern-feature portion of the claim. It does not identify that feature as the eROSITA bubbles; it also notes that the feature is visible in the earlier ROSAT map. (LLM, conf=0.86)
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1 of the 33 references couldn’t be matched to a known paper.
Research works printed but not linked: 2
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Detection of large-scale X-ray bubbles in the Milky Way halo
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MAXI: Monitor of All-Sky X-Ray Image
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Self-citationMAXI: Monitor of All-Sky X-ray Image
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Self-citation
- Authors
- Nakahira, S., Tsunemi, H., Tomida, H., Nakashima, S., Kataoka, R., & Makishima, K.
- Affiliations
- Japan Aerospace Exploration Agency (JP)
- The University of Osaka (JP)
- RIKEN (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Kavli Institute for the Physics and Mathematics of the Universe (JP)
- Corresponding author
- Nakahira, Satoshi
- ORCID
- Nakahira, Satoshi
- Venue
- Publications of the Astronomical Society of Japan
- Publisher
- Oxford University Press (OUP)
- Published
- 2020-01-31
- Volume
- 72
- Issue
- 2
- ISSN
- 0004-6264 (ISSN-L)
- 2053-051X
- OpenAlex
- W2992836606
- Cited by
- 9
- References
- 33
- Citations by year
- 2024: 3 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 2
- FWCI
- 0.67
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- Publications of the Astronomical Society of Japan (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- RIKEN
- JAXA
- MAXI
- 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
- diffuse X-ray background, all-sky maps, MAXI, ROSAT All-Sky Survey, Galactic Center, solar wind charge exchange, soft X-ray emission
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