Full spectral fitting of Milky Way and M31 globular clusters: Ages and metallicities

被引：0
|
作者：
机构：
[1] Cezario, E.
[2] Coelho, P.R.T.
[3] Alves-Brito, A.
[4] Forbes, D.A.
[5] Brodie, J.P.
来源：
| 1600年 / EDP Sciences卷 / 549期
关键词：
Context. The formation and evolution of disk galaxies are long standing questions in astronomy. Understanding the properties of globular cluster systems can lead to important insights on the evolution of its host galaxy. Aims. We aim to obtain the stellar population parameters - age and metallicity - of a sample of M31 and Galactic globular clusters. Studying their globular cluster systems is an important step towards understanding their formation and evolution in a complete way. Methods. Our analysis employs a modern pixel-to-pixel spectral fitting technique to fit observed integrated spectra to updated stellar population models. By comparing observations to models we obtain the ages and metallicities of their stellar populations. We apply this technique to a sample of 38 globular clusters in M31 and to 41 Galactic globular clusters; used as a control sample. Results. Our sample of M31 globular clusters spans ages from 150 Myr to the age of the Universe. Metallicities [Fe/H] range from - 2.2 dex to the solar value. The age-metallicity relation obtained can be described as having two components: an old population with a flat age-[Fe/H] relation; possibly associated with the halo and/or bulge; and a second one with a roughly linear relation between age and metallicity; higher metallicities corresponding to younger ages; possibly associated with the M31 disk. While we recover the very well known Galactic GC metallicity bimodality; our own analysis of M31's metallicity distribution function (MDF) suggests that both GC systems cover basically the same [Fe/H] range yet M31's MDF is not clearly bimodal. These results suggest that both galaxies experienced different star formation and accretion histories. © ESO 2013;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
相关论文
共 50 条
  • [1] Full spectral fitting of Milky Way and M31 globular clusters: ages and metallicities
    Cezario, E.
    Coelho, P. R. T.
    Alves-Brito, A.
    Forbes, D. A.
    Brodie, J. P.
    ASTRONOMY & ASTROPHYSICS, 2013, 549
  • [2] M31 globular cluster metallicities and ages
    Barmby, P
    EXTRAGALACTIC STAR CLUSTERS, 2002, 207 : 58 - 61
  • [3] M31 globular clusters: Colors and metallicities
    Barmby, P
    Huchra, JP
    Brodie, JP
    Forbes, DA
    Schroder, LL
    ASTRONOMICAL JOURNAL, 2000, 119 (02): : 727 - 747
  • [4] Ages and metallicities for several clusters of the milky way
    Kovaleva, DA
    GALACTIC & STELLAR DYNAMICS, 2003, 10 : 169 - 173
  • [5] α-enhanced integrated Lick/IDS spectral indices and Milky Way and M31 globular clusters and early-type galaxies
    Lee, HC
    Worthey, G
    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2005, 160 (01): : 176 - 198
  • [6] Correlations between the Intrinsic Colors and Spectroscopic Metallicities of M31 Globular Clusters
    Fan, Zhou
    Ma, Jun
    Zhou, Xu
    Jiang, Zhaoji
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2010, 122 (892) : 636 - 650
  • [7] The chemical properties of Milky Way and M31 globular clusters. I. A comparative study
    Beasley, MA
    Brodie, JP
    Strader, J
    Forbes, DA
    Proctor, RN
    Barmby, P
    Huchra, JP
    ASTRONOMICAL JOURNAL, 2004, 128 (04): : 1623 - 1645
  • [8] Measuring M31 globular cluster ages and metallicities using both photometry and spectroscopy
    Usher, Christopher
    Caldwell, Nelson
    Cabrera-Ziri, Ivan
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 528 (04) : 6010 - 6024
  • [9] Catalogue of model star clusters in the Milky Way and M31 galaxies
    Chen, Yingtian
    Gnedin, Oleg Y.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 527 (02) : 3692 - 3708
  • [10] The globular clusters and halo of M31
    Holland, S
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1998, 110 (748) : 759 - 759
12345