Discovery of a dense association of stars in the vicinity of the supermassive black hole Sgr A*

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00601312" target="_blank" >RIV/67985815:_____/24:00601312 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/24:00137612

Výsledek na webu

<a href="https://hdl.handle.net/11104/0358549" target="_blank" >https://hdl.handle.net/11104/0358549</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad7d06" target="_blank" >10.3847/1538-4357/ad7d06</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Discovery of a dense association of stars in the vicinity of the supermassive black hole Sgr A*

Popis výsledku v původním jazyce

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 6.'' 05 northeast of the supermassive black hole Sagittarius A* (Sgr A*), within the radius of 1.'' 35. 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, K (s) , and L ' 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 similar to 10(4) M (circle dot) 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.

Název v anglickém jazyce

Discovery of a dense association of stars in the vicinity of the supermassive black hole Sgr A*

Popis výsledku anglicky

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 6.'' 05 northeast of the supermassive black hole Sagittarius A* (Sgr A*), within the radius of 1.'' 35. 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, K (s) , and L ' 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 similar to 10(4) M (circle dot) 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

975

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

261

Kód UT WoS článku

001350934500001

EID výsledku v databázi Scopus

2-s2.0-85209369338