Near-infrared photometry and spectroscopy of the low Galactic latitude globular cluster 2MASS-GC 03
Near-infrared photometry and spectroscopy of the low Galactic latitude globular cluster 2MASS-GC 03
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DOI：
10.1093/mnras/stw1674
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发表时间：
2016-07
影响因子：
4.8
通讯作者：
J. Carballo-Bello;S. R. Alegria;J. Borissova;L. Smith;R. Kurtev;P. Lucas;C. M. Bidin;J. Alonso-García;D. Minniti;T. Palma;I. Dékány;N. Medina;M. Moyano;V. Villanueva;M. Kuhn
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文献类型：
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作者：
J. Carballo-Bello;S. R. Alegria;J. Borissova;L. Smith;R. Kurtev;P. Lucas;C. M. Bidin;J. Alonso-García;D. Minniti;T. Palma;I. Dékány;N. Medina;M. Moyano;V. Villanueva;M. Kuhn
我们利用Clay望远镜（Las Campanas Observatory）上的MMIRS和Via Lactea巡天（VVV）数据中的VISTA变量，对银河系盘中投影的球状星团2MASS-GC03进行了深近红外测光和光谱分析。大多数可能的候选星团成员是通过近红外光度法确定的。在10个候选者中，有5个具有星团成员的性质，由此我们计算出= -0.9 +- 0.2，径向速度为v_r > = -78 +- 12km/s。据估计，从3个可能的RRLyrae成员到它们的距离为10.8公里。鉴于该星团目前距离银河系中心4.2千光年，该星团的生存时间估计为11.3±1.2千光年，这加强了其球状星团性质的证据。星团在银河系中心的方向上有延伸的迹象。
We present deep near-infrared photometry and spectroscopy of the globular cluster 2MASS-GC03 projected in the Galactic disk using MMIRS on the Clay telescope (Las Campanas Observatory) and VISTA Variables in the Via Lactea survey (VVV) data. Most probable cluster member candidates were identified from near-infrared photometry. Out of ten candidates that were followed-up spectroscopically, five have properties of cluster members, from which we calculate = -0.9 +- 0.2 and a radial velocity of v_r > = -78 +- 12km/s. A distance of 10.8kpc is estimated from 3 likely RRLyrae members. Given that the cluster is currently at a distance of 4.2kpc from the Galactic center, the cluster's long survival time of an estimated 11.3 +- 1.2Gyr strengthens the case for its globular-cluster nature. The cluster has a hint of elongation in the direction of the Galactic center.