Neutron stars and millisecond pulsars in star clusters: implications for the diffuse gamma-radiation from the Galactic Centre

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10391597" target="_blank" >RIV/00216208:11320/18:10391597 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/sty2234" target="_blank" >https://doi.org/10.1093/mnras/sty2234</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/sty2234" target="_blank" >10.1093/mnras/sty2234</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Neutron stars and millisecond pulsars in star clusters: implications for the diffuse gamma-radiation from the Galactic Centre

Popis výsledku v původním jazyce

Globular clusters (GCs) are the ideal environment for the formation of neutron stars (NSs) and millisecond pulsars (MSPs). NSs origin and evolution provide a useful information on stellar dynamics and evolution in star clusters. NSs are among the most interesting astrophysical objects, being precursors of several high-energy phenomena such as gravitational waves and gamma-ray bursts. Due to a large velocity kick that they receive at birth, most of the NSs escape the local field, affecting the evolution and dynamics of their parent cluster. In this paper, we study the origin and dynamical evolution of NSs within GCs with different initial masses, metallicities, and primordial binary fractions. We find that the radial profile of NSs is shaped by the black hole (BH) content of the cluster, which partially quenches the NS segregation until most of the BHs are ejected from the system. Independently on the cluster mass and initial configuration, the NSs map the average stellar population, as their average radial distance is approximate to 60 - 80 per cent of the cluster half-mass radius. Finally, by assuming a recycling fraction of f(rec) = 0.1 and an average MSP gamma-ray emission of L gamma = 2 x 10(33) erg s(-1), we show that the typical gamma-ray emission from our GCs agrees with observations and supports the MSP origin of the gamma-ray excess signal observed by the Fermi-LAT telescope in the Galactic Centre.

Název v anglickém jazyce

Neutron stars and millisecond pulsars in star clusters: implications for the diffuse gamma-radiation from the Galactic Centre

Popis výsledku anglicky

Globular clusters (GCs) are the ideal environment for the formation of neutron stars (NSs) and millisecond pulsars (MSPs). NSs origin and evolution provide a useful information on stellar dynamics and evolution in star clusters. NSs are among the most interesting astrophysical objects, being precursors of several high-energy phenomena such as gravitational waves and gamma-ray bursts. Due to a large velocity kick that they receive at birth, most of the NSs escape the local field, affecting the evolution and dynamics of their parent cluster. In this paper, we study the origin and dynamical evolution of NSs within GCs with different initial masses, metallicities, and primordial binary fractions. We find that the radial profile of NSs is shaped by the black hole (BH) content of the cluster, which partially quenches the NS segregation until most of the BHs are ejected from the system. Independently on the cluster mass and initial configuration, the NSs map the average stellar population, as their average radial distance is approximate to 60 - 80 per cent of the cluster half-mass radius. Finally, by assuming a recycling fraction of f(rec) = 0.1 and an average MSP gamma-ray emission of L gamma = 2 x 10(33) erg s(-1), we show that the typical gamma-ray emission from our GCs agrees with observations and supports the MSP origin of the gamma-ray excess signal observed by the Fermi-LAT telescope in the Galactic Centre.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

480

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

4955-4962

Kód UT WoS článku

000449617100052

EID výsledku v databázi Scopus

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