Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00144346" target="_blank" >RIV/00216224:14310/25:00144346 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staf810" target="_blank" >https://doi.org/10.1093/mnras/staf810</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staf810" target="_blank" >10.1093/mnras/staf810</a>
Alternative languages
Result language
angličtina
Original language name
Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
Original language description
Several models have been proposed to explain missing red giants (RGs) near the Galactic centre. Recently, a scenario has been suggested that predicts, among other processes, a long-term ablation of the surface layers of RGs during their repetitive passages through the Galactic jet. In this study, we perform detailed 3D numerical modelling of this phenomenon. We calculate the ablation rate of the surface layers of an RG orbiting the supermassive black hole (SMBH) as it passes through the nuclear jet. In particular, we model the jet-star interaction for approximately 10 passages for the closer orbital distance of 10(-3) pc and 2 passages for 10(-2) pc. We find that the mass loss due to ablation by the jet behaves with time as Delta M-star proportional to root t and the total ablated mass during a single active Galactic nucleus (AGN) phase (10(5) yr) is similar to 10(-4) M-circle dot. We arrive at similar rates of the stellar ablation for the relatively smaller jet luminosity 10(42) erg s(-1) as in the previous analytical calculations. For larger jet luminosities of 10(44) and 10(48) erg s(-1), the ablation rates inferred from similar to 10 interactions as well as extrapolated power-law fits are significantly lower than analytical values. Overall, the mass ablation rate per interaction and the extrapolated cumulative mass loss during the jet activity are comparable to the stellar-wind mass loss. For the smallest orbital distance of 10(-3) pc, we also track the thermal behaviour of the stellar surface layer, whose temperature appears to grow rapidly during the first 10 passages from similar to 3600 K (spectral type M) to similar to 8500 K (spectral type A). RG-jet interactions can thus lead to observable changes in the nuclear stellar population during the jet existence.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
540
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
22
Pages from-to
1586-1607
UT code for WoS article
001499900400001
EID of the result in the Scopus database
2-s2.0-105006985607