SIMBAD references

2013MNRAS.436.2763M - Mon. Not. R. Astron. Soc., 436, 2763-2773 (2013/December-2)

On the nature of the brightest globular cluster in M81.

MAYYA Y.D., ROSA-GONZALEZ D., SANTIAGO-CORTES M., RODRIGUEZ-MERINO L.H., VEGA O., TORRES-PAPAQUI J.P., BRESSAN A. and CARRASCO L.

Abstract (from CDS):

We analyse the photometric, chemical, star formation history and structural properties of the brightest globular cluster (GC) in M81, referred to 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 = 1.2pc, tidal radius rt = 76rc), old (>13Gyr) 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 1.0x107 M, 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.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): catalogues - globular clusters: general - galaxies: individual: M81 - galaxies: spiral - galaxies: star clusters: general

CDS comments: GC1 is [NHM2010] 1029 in Simbad.

Simbad objects: 16

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2019.10.21-03:22:34

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