Discovery of a Dense Association of Stars in the Vicinity of
the Supermassive Black Hole Sgr A*

J 2024

Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*

HOSSEINI, S. Elaheh; Andreas ECKART; Michal ZAJAČEK; Silke BRITZEN; Harshitha K. BHAT et al.

Základní údaje

Originální název

Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*

Autoři

HOSSEINI, S. Elaheh; Andreas ECKART; Michal ZAJAČEK; Silke BRITZEN; Harshitha K. BHAT a Vladimír KARAS

Vydání

The Astrophysical Journal, IOP Publishing Ltd, 2024, 0004-637X

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: 5.400

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/24:00137612

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Galactic center; Stellar associations; Young star clusters; Intermediate-mass black holes; Infrared astronomy; Infrared photometry; Proper motions; Stellar motion; Star clusters; Stellar kinematics; Astrophysical black holes; Infrared excess

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 13. 12. 2024 12:32, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

We focus on a sample of 42 sources in the vicinity of the bow-shock source IRS 1W (N-source region), located at a distance of 6farcs05 northeast of the supermassive black hole Sagittarius A* (Sgr A*), within the radius of 1farcs35. We present the first proper-motion measurements of N sources and find that a larger subset of N sources (28 sources) exhibit a north–west (NW) flying angle. These sources can be bound by an intermediate-mass black hole (IMBH) or the concentration that we observe is due to a disk-like distribution projection along the line of sight. We detect the N sources in the H, Ks, and bands. The NW-ward flying sources could be a bound collection of stars. We discuss the tentative existence of an IMBH or an inclined disk distribution to explain the significant overdensity of stars. The first scenario of having an IMBH implies the lower limit of ∼104M⊙ for the putative IMBH. Our measurements for the first time reveal that the dense association of stars containing IRS 1W is a comoving group of massive, young stars. This stellar association might be the remnant core of a massive stellar cluster that is currently being tidally stripped as it inspirals toward Sgr A*. The second scenario suggests that the appearance of the N sources might be influenced by the projection of a disk-like distribution of younger He-stars and/or dust-enshrouded stars.

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

90247, velká výzkumná infrastruktura

Název: CTA-CZ III

Citovat

HOSSEINI, S. Elaheh; Andreas ECKART; Michal ZAJAČEK; Silke BRITZEN; Harshitha K. BHAT a Vladimír KARAS. Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*. The Astrophysical Journal. IOP Publishing Ltd, 2024, roč. 975, č. 2, s. 1-15. ISSN 0004-637X. Dostupné z: https://doi.org/10.3847/1538-4357/ad7d06.

@article{2451380,
   author = {Hosseini, S. Elaheh and Eckart, Andreas and Zajaček, Michal and Britzen, Silke and Bhat, Harshitha K. and Karas, Vladimír},
   article_number = {2},
   doi = {https://doi.org/10.3847/1538-4357/ad7d06},
   keywords = {Galactic center; Stellar associations; Young star clusters; Intermediate-mass black holes; Infrared astronomy; Infrared photometry; Proper motions; Stellar motion; Star clusters; Stellar kinematics; Astrophysical black holes; Infrared excess},
   language = {eng},
   issn = {0004-637X},
   journal = {The Astrophysical Journal},
   title = {Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*},
   url = {https://iopscience.iop.org/article/10.3847/1538-4357/ad7d06},
   volume = {975},
   year = {2024}
}

TY  - JOUR
ID  - 2451380
AU  - Hosseini, S. Elaheh - Eckart, Andreas - Zajaček, Michal - Britzen, Silke - Bhat, Harshitha K. - Karas, Vladimír
PY  - 2024
TI  - Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
JF  - The Astrophysical Journal
VL  - 975
IS  - 2
SP  - 1-15
EP  - 1-15
PB  - IOP Publishing Ltd
SN  - 0004637X
KW  - Galactic center
KW  - Stellar associations
KW  - Young star clusters
KW  - Intermediate-mass black holes
KW  - Infrared astronomy
KW  - Infrared photometry
KW  - Proper motions
KW  - Stellar motion
KW  - Star clusters
KW  - Stellar kinematics
KW  - Astrophysical black holes
KW  - Infrared excess
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ad7d06
N2  - We focus on a sample of 42 sources in the vicinity of the bow-shock source IRS 1W (N-source region), located at a distance of 6farcs05 northeast of the supermassive black hole Sagittarius A* (Sgr A*), within the radius of 1farcs35. We present the first proper-motion measurements of N sources and find that a larger subset of N sources (28 sources) exhibit a north–west (NW) flying angle. These sources can be bound by an intermediate-mass black hole (IMBH) or the concentration that we observe is due to a disk-like distribution projection along the line of sight. We detect the N sources in the H, Ks, and bands. The NW-ward flying sources could be a bound collection of stars. We discuss the tentative existence of an IMBH or an inclined disk distribution to explain the significant overdensity of stars. The first scenario of having an IMBH implies the lower limit of ∼104M⊙ for the putative IMBH. Our measurements for the first time reveal that the dense association of stars containing IRS 1W is a comoving group of massive, young stars. This stellar association might be the remnant core of a massive stellar cluster that is currently being tidally stripped as it inspirals toward Sgr A*. The second scenario suggests that the appearance of the N sources might be influenced by the projection of a disk-like distribution of younger He-stars and/or dust-enshrouded stars.
ER  -

HOSSEINI, S. Elaheh; Andreas ECKART; Michal ZAJAČEK; Silke BRITZEN; Harshitha K. BHAT a Vladimír KARAS. Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*. \textit{The Astrophysical Journal}. IOP Publishing Ltd, 2024, roč.~975, č.~2, s.~1-15. ISSN~0004-637X. Dostupné z: https://doi.org/10.3847/1538-4357/ad7d06.

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