Título

On the nature of the brightest globular cluster in M81

Autor

Yalia Divakara Mayya

DANIEL ROSA GONZALEZ

MAYRA SANTIAGO CORTES

Lino Héctor Rodríguez Merino

OLGA MERCEDES VEGA CASANOVA

Luis Carrasco Bazúa

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Materias

Catalogs - (INSPEC) Galaxies: individual (M81) - (INSPEC) Galaxies: spiral - (INSPEC) Galaxies: star clusters - (INSPEC) Globular clusters: general - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI)

Resumen o descripción

We analyse the photometric, chemical, star formation history and structural properties of the brightest globular cluster (GC) in M81, referred as GC1 in this work, with the intention of establishing its nature and origin. We find that it is a metal-rich ([Fe/H]=−0.60 ± 0.10), alpha-enhanced ([α/Fe] ~ 0.20 ± 0.05), core-collapsed (core radius rc = 1.2 pc, tidal radius rt = 76rc), old (> 13 Gyr) cluster. It has an ultraviolet excess equivalent of ~ 2500 blue horizontal branch stars. It is detected in X-rays indicative of the presence of low-mass binaries. With a mass of 1.0 × 10⁷ Mʘ, the cluster is comparable in mass to M31-G1 and is four times more massive than ω Cen. The values of rc, absolute magnitude and mean surface brightness of GC1 suggest that it could be, like massive GCs in other giant galaxies, the left-over nucleus of a dissolved dwarf galaxy.

Editor

Monthly Notices of the Royal Astronomical Society

Fecha de publicación

11 de diciembre de 2013

Tipo de publicación

Artículo

Versión de la publicación

Versión aceptada

Recurso de información

http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2251

Formato

application/pdf

Idioma

Inglés

Audiencia

Estudiantes

Investigadores

Público en general

Sugerencia de citación

Mayya, Y.D., et al., (2013), On the nature of the brightest globular cluster in M81, Monthly Notices of the Royal Astronomical Society, Vol. 436(1):2763-2773

Repositorio Orígen

Repositorio Institucional del INAOE

Descargas

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