Red giant–jet collisions in galactic nuclei I: 3D
hydrodynamical model of a few stellar orbits

J 2025

Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits

KURFÜRST, Petr; Michal ZAJAČEK; Norbert WERNER a Jiří KRTIČKA

Základní údaje

Originální název

Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits

Autoři

KURFÜRST, Petr; Michal ZAJAČEK; Norbert WERNER a Jiří KRTIČKA

Vydání

Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2025, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 4.800 v roce 2024

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/25:00144346

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

shock waves; stars: late-type; Galaxy: centre; galaxies: jets

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 13. 6. 2025 13:29, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Návaznosti

GM24-10599M, projekt VaV

Název: Hvězdy v galaktických jádrech: vzájemný vztah s masivními černými dírami

Investor: Grantová agentura ČR, Hvězdy v galaktických jádrech: vzájemný vztah s masivními černými dírami

GX21-13491X, projekt VaV

Název: Zkoumání žhavého vesmíru a porozumění kosmické zpětné vazbě (Akronym: EHU)

Investor: Grantová agentura ČR, Exploring the Hot Universe and Understanding Comic Feedback

Přiložené soubory

2503158.pdf

Citovat

KURFÜRST, Petr; Michal ZAJAČEK; Norbert WERNER a Jiří KRTIČKA. Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2025, roč. 540, č. 2, s. 1586-1607. ISSN 0035-8711. Dostupné z: https://doi.org/10.1093/mnras/staf810.

@article{2503158,
   author = {Kurfürst, Petr and Zajaček, Michal and Werner, Norbert and Krtička, Jiří},
   article_number = {2},
   doi = {https://doi.org/10.1093/mnras/staf810},
   keywords = {shock waves; stars: late-type; Galaxy: centre; galaxies: jets},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits},
   url = {https://doi.org/10.1093/mnras/staf810},
   volume = {540},
   year = {2025}
}

TY  - JOUR
ID  - 2503158
AU  - Kurfürst, Petr - Zajaček, Michal - Werner, Norbert - Krtička, Jiří
PY  - 2025
TI  - Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 540
IS  - 2
SP  - 1586-1607
EP  - 1586-1607
PB  - Oxford University Press
SN  - 00358711
KW  - shock waves
KW  - stars: late-type
KW  - Galaxy: centre
KW  - galaxies: jets
UR  - https://doi.org/10.1093/mnras/staf810
N2  - 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.
ER  -

KURFÜRST, Petr; Michal ZAJAČEK; Norbert WERNER a Jiří KRTIČKA. Red giant–jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2025, roč.~540, č.~2, s.~1586-1607. ISSN~0035-8711. Dostupné z: https://doi.org/10.1093/mnras/staf810.

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