论文标题

Gaia-igrins协同作用:新确定的银河系星团的轨道

Gaia-IGRINS synergy: Orbits of Newly Identified Milky Way Star Clusters

论文作者

Garro, Elisa R., Fernández-Trincado, José G., Minniti, Dante, Moya, Wisthon H., Palma, Tali, Beers, Timothy C., Placco, Vinicius M., Barbuy, Beatriz, Sneden, Chris, Alves-Brito, Alan, Dias, Bruno, Afşar, Melike, Frelijj, Heinz, Lane, Richard R.

论文摘要

最近精美的GAIA天文学,光度法和径向速度(RV)测量结果导致确定旧星团的轨道(包括最古老的银河系簇(MW GCS))的轨道取得了很大的进步。本文的主要目的是使用Gaia DR3和VVVX测量值来获取近十几个新的银河GC候选者的轨道,这些候选者的研究或以前没有探索。我们使用GAIA DR3和VVVX数据库来识别银河GC候选者的真正成员:VVV-CL160,Patchick122,Patchick125,Patchick126,Patchick126,Kronberger99,Kronberger99,Kronberger119,Kronberger119,Kronberger143,Kronberger143,ESO92-18,ESO92-18,ESO93-08,gaia2,FERRRAA254,FERRERAIA,和FERRRARA,和FERRRAAIA,FERRRARA,和FERRRARAAIA,FERRRAAIA,FERRRAAIA,FERRRARA,和FERRRARA.54。相关的平均簇物理参数是得出的(距离,银河坐标,正确的运动,RVS)。我们使用带有Igrins高分辨率光谱仪的双子座 - 南望远镜获得的观测值测量GCS VVV-CL160和PatchICK126的准确平均RV。然后,假设典型的银河条模式速度,使用GravPot16模型计算每个群集的轨道。我们首次重建这些簇的轨道。其中包括带有银河凸起和磁盘中的逆行和轨道轨道运动的星形簇。对于我们的样品,获得了轨道特性,例如周形和垂直距离的平均时间变化,偏心率,从银河平面的垂直偏移以及我们样品的角动量的z组分。我们的主要结论是,基于轨道参数,Patchick125和PatchICK126是真正的MW Bulge/Halo GC。 Ferrero54,Gaia2和Patchick122是MW磁盘GC。 Kronberger99,Kronberger119,Kronberger143,ESO92-18和ESO93-08的轨道更与旧的MW磁盘开放式簇一致。 VVV-CL160非常靠近银河系中心,但到达太阳以外的距离更大,因此其起源仍不清楚。

The recent exquisite Gaia astrometric, photometric, and radial velocity (RV) measurements resulted in a substantial advancement for the determination of the orbits for old star clusters, including the oldest Milky Way globular clusters (MW GCs). The main goal of this paper is to use the Gaia DR3 and the VVVX measurements to obtain the orbits for nearly a dozen new Galactic GC candidates that have been poorly studied or previously unexplored. We use the Gaia DR3 and VVVX databases to identify bonafide members of the Galactic GC candidates: VVV-CL160, Patchick122, Patchick125, Patchick126, Kronberger99, Kronberger119, Kronberger143, ESO92-18, ESO93-08, Gaia2, and Ferrero54. The relevant mean cluster physical parameters are derived (distances, Galactic coordinates, proper motions, RVs). We measure accurate mean RVs for the GCs VVV-CL160 and Patchick126, using observations acquired at the Gemini-South telescope with the IGRINS high-resolution spectrograph. Orbits for each cluster are then computed using the GravPot16 model, assuming typical Galactic bar pattern speeds. We reconstruct the orbits for these clusters for the first time. These include star clusters with retrograde and prograde orbital motions, both in the Galactic bulge and disk. Orbital properties, such as the mean time-variations of perigalactic and apogalactic distances, eccentricities, vertical excursions from the Galactic plane, and Z-components of the angular momentum are obtained for our sample. Our main conclusion is that, based on the orbital parameters, Patchick125 and Patchick126 are genuine MW bulge/halo GCs; Ferrero54, Gaia2 and Patchick122 are MW disk GCs. The orbits of Kronberger99, Kronberger119, Kronberger143, ESO92-18, and ESO93-08 are more consistent with old MW disk open clusters. VVV-CL160 falls very close to the Galactic centre, but reaches larger distances beyond the Sun, thus its origin is still unclear.

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