标题： 双极分子外流和GLIMPSE扩展绿色天体（EGOs）中的热核心 显示英文标题

标题： Bipolar Molecular Outflows and Hot Cores in GLIMPSE Extended Green Objects (EGOs)

摘要： 我们展示了对两个GLIMPSE扩展绿色天体(EGOs)--基于其在斯皮策图像中延伸的4.5微米发射识别出的大质量年轻恒星物体(MYSO)喷流候选者的高角分辨率次毫米阵列(SMA)和射电毫米波天文学联合阵列(CARMA)观测。毫米波观测揭示了双极分子喷流，由高速12CO(2-1)和HCO+(1-0)发射追踪，并与两个源中的4.5微米叶状结构一致。SiO(2-1)发射确认延伸的4.5微米发射追踪活跃的喷流。每个EGO中识别出一个主要喷流，在一个源(G11.92-0.61)中存在多个喷流的初步证据。喷流驱动源是紧凑的毫米连续谱核心，表现出热核光谱线发射，并与6.7 GHz II类甲醇脉泽相关。G11.92-0.61与至少三个紧凑核心相关：喷流驱动源，以及两个几乎无线发射的核心。相比之下，G19.01-0.03表现为一个MYSO。多重性差异、其热核发射的相对弱性以及其延伸包层分子气体的主导性都表明，G19.01-0.03可能比G11.92-0.61处于更早的演化阶段。对G19.01-0.03光谱能量分布的建模表明，一个中心(原)恒星(M ~10 Msun)已形成于紧凑毫米核心(Mgas ~ 12-16 Msun)，并且吸积率约为每年10^-3个太阳质量。我们的观测证实这些EGOs是驱动大质量双极分子喷流的年轻MYSO，并表明EGO样本中存在相当大的化学和演化多样性。 显示英文摘要

摘要： We present high angular resolution Submillimeter Array (SMA) and Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of two GLIMPSE Extended Green Objects (EGOs)--massive young stellar object (MYSO) outflow candidates identified based on their extended 4.5 micron emission in Spitzer images. The mm observations reveal bipolar molecular outflows, traced by high-velocity 12CO(2-1) and HCO+(1-0) emission, coincident with the 4.5 micron lobes in both sources. SiO(2-1) emission confirms that the extended 4.5 micron emission traces active outflows. A single dominant outflow is identified in each EGO, with tentative evidence for multiple flows in one source (G11.92-0.61). The outflow driving sources are compact millimeter continuum cores, which exhibit hot-core spectral line emission and are associated with 6.7 GHz Class II methanol masers. G11.92-0.61 is associated with at least three compact cores: the outflow driving source, and two cores that are largely devoid of line emission. In contrast, G19.01-0.03 appears as a single MYSO. The difference in multiplicity, the comparative weakness of its hot core emission, and the dominance of its extended envelope of molecular gas all suggest that G19.01-0.03 may be in an earlier evolutionary stage than G11.92-0.61. Modeling of the G19.01-0.03 spectral energy distribution suggests that a central (proto)star (M ~10 Msun) has formed in the compact mm core (Mgas ~ 12-16 Msun), and that accretion is ongoing at a rate of ~10^-3 solar masses per year. Our observations confirm that these EGOs are young MYSOs driving massive bipolar molecular outflows, and demonstrate that considerable chemical and evolutionary diversity are present within the EGO sample.