Depletion of Bright Red Giants in the Galactic Center during Its Active Phases

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00539781" target="_blank" >RIV/67985815:_____/20:00539781 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/abbd94" target="_blank" >https://doi.org/10.3847/1538-4357/abbd94</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/abbd94" target="_blank" >10.3847/1538-4357/abbd94</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Depletion of Bright Red Giants in the Galactic Center during Its Active Phases

Popis výsledku v původním jazyce

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*.

Název v anglickém jazyce

Depletion of Bright Red Giants in the Galactic Center during Its Active Phases

Popis výsledku anglicky

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*.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA20-19854S" target="_blank" >GA20-19854S: Studium urychlení částic v astrofyzikálních výtryscích</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

1538-4357

e-ISSN

—

Svazek periodika

903

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

140

Kód UT WoS článku

000588836700001

EID výsledku v databázi Scopus

2-s2.0-85096610046