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Conditions for thermal instability in the Galactic Centre mini-spiral region
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SYSNO ASEP 0434721 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Conditions for thermal instability in the Galactic Centre mini-spiral region Author(s) Rózanska, A. (PL)
Czerny, B. (PL)
Kunneriath, Devaky (ASU-R) RID
Adhikari, T. P. (NP)
Karas, Vladimír (ASU-R) RID, ORCID
Moscibrodzka, M. (PL)Number of authors 6 Source Title Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 445, č. 4 (2014), s. 4385-4394Number of pages 10 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords black holes ; accretion discs ; galactic centre Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects GC13-00070J GA ČR - Czech Science Foundation (CSF) LH14049 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support ASU-R - RVO:67985815 UT WOS 000346963300083 DOI 10.1093/mnras/stu2066 Annotation We explore the conditions for thermal instability to operate in the mini-spiral region of the Galactic Centre (Sgr A*), where both hot and cold media are known to coexist. The photoionization Cloudy calculations are performed for different physical states of plasma.We neglect the dynamics of the material and concentrate on studying the parameter ranges where thermal instability may operate, taking into account the past history of Sgr A*’s bolometric luminosity. We show that thermal instability does not operate at the present very low level of Sgr A* activity. The instability enhances the clumpiness of the mini-spiral medium and creates the possibility for episodes of enhanced accretion of cold clumps towards Sgr A*. The mechanism determines the range of masses and sizes of clouds; under the conditions of Sgr A*, the likely values are 1–102 M-circle for the cloud’s typical mass. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2015
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