SIMBAD references

2017MNRAS.468.4513M - Mon. Not. R. Astron. Soc., 468, 4513-4528 (2017/July-2)

Ages and structural and dynamical parameters of two globular clusters in the M81 group.

MA J., WANG S., WU Z., ZHANG T., ZOU H., ZHOU Z., NIE J., ZHOU X., PENG X., WANG J., WU J., DU C. and YUAN Q.

Abstract (from CDS):

GC-1 and GC-2 are two globular clusters (GCs) in the remote halo of M81 and M82 in the M81 group discovered by Jang et al. using the Hubble Space Telescope (HST) images. These two GCs were observed as part of the Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolor Sky Survey using 14 intermediate-band filters covering a wavelength range of 4000-10 000 Å. We accurately determine these two clusters' ages and masses by comparing their spectral energy distributions (from 2267 to 20 000 Å, comprising photometric data in the near-ultraviolet of the Galaxy Evolution Explorer, 14 BATC intermediate-band and Two Micron All Sky Survey near-infrared JHKs filters) with theoretical stellar population-synthesis models, resulting in ages of 15.50 ± 3.20 for GC-1 and 15.10 ± 2.70 Gyr for GC-2. The masses of GC-1 and GC-2 obtained here are 1.77-2.04 x 106 and 5.20-7.11 x 106 M, respectively. In addition, the deep observations with the Advanced Camera for Surveys and Wide Field Camera 3 on the HST are used to provide the surface brightness profiles of GC-1 and GC-2. The structural and dynamical parameters are derived from fitting the profiles to three different models; in particular, the internal velocity dispersions of GC-1 and GC-2 are derived, which can be compared with ones obtained based on spectral observations in the future. For the first time, in this paper, the rh versus MV diagram shows that GC-2 is an ultra-compact dwarf in the M81 group.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: star clusters: general - galaxies: star clusters: individual: M81 - galaxies: star clusters: individual: M82 - galaxies: star clusters: individual: M82

CDS comments: GC-1= SDSS J095326.22+693117.5 and GC-2 = SDSS J095320.17+693916.3 in Simbad.

Simbad objects: 24

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2017MNRAS.468.4513M and select 'bookmark this link' or equivalent in the popup menu


2019.10.22-22:26:21

© Université de Strasbourg/CNRS

    • Contact