Universität zu Köln

Zajacek, Michal ORCID: 0000-0001-6450-1187, Araudo, Anabella ORCID: 0000-0001-7605-5786, Karas, Vladimir ORCID: 0000-0002-5760-0459, Czerny, Bozena ORCID: 0000-0001-5848-4333 and Eckart, Andreas ORCID: 0000-0001-6049-3132 (2020). Depletion of Bright Red Giants in the Galactic Center during Its Active Phases. Astrophys. J., 903 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

Observations in the near-infrared domain showed the presence of the flat core of bright late-type stars inside similar to 0.5 pc from the Galactic center supermassive black hole (Sgr A*), while young massive OB/Wolf-Rayet stars form a cusp. Several dynamical processes were proposed to explain this apparent paradox of the distribution of the Galactic center stellar populations. Given the mounting evidence on the significantly increased activity of Sgr A* during the past million years, we propose a scenario based on the interaction between the late-type giants and a nuclear jet, whose past existence and energetics can be inferred from the presence of gamma-ray Fermi bubbles and bipolar radio bubbles. Extended, loose envelopes of red giant stars can be ablated by the jet with kinetic luminosity in the range of L-j 10(41)-10(44) erg s(-1) within the inner similar to 0.04 pc of Sgr A* (S-cluster region), which would lead to their infrared luminosity decrease after several thousand jet-star interactions. The ablation of the atmospheres of red giants is complemented by the process of tidal stripping that operates at distances of less than or similar to 1 mpc, and by the direct mechanical interaction of stars with a clumpy disk at greater than or similar to 0.04 pc, which can explain the flat density profile of bright late-type stars inside the inner half parsec from Sgr A*.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Araudo, Anabella UNSPECIFIED orcid.org/0000-0001-7605-5786 UNSPECIFIED Karas, Vladimir UNSPECIFIED orcid.org/0000-0002-5760-0459 UNSPECIFIED Czerny, Bozena UNSPECIFIED orcid.org/0000-0001-5848-4333 UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-313506
DOI:	10.3847/1538-4357/abbd94
Journal or Publication Title:	Astrophys. J.
Volume:	903
Number:	2
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SAGITTARIUS-A-ASTERISK; BLACK-HOLE; TIDAL DISRUPTION; CENTRAL PARSEC; STAR-FORMATION; RAY EMISSION; EVOLUTION; CLUSTER; COLLISIONS; DYNAMICS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31350