A global view on star formation: The GLOSTAR Galactic plane survey. VI. Radio Source Catalog II: $28^\circ < \ell < 36^\circ$ and $|b| < 1^\circ$, VLA B-configuration
S. A. Dzib, A. Y. Yang, J. S. Urquhart, S. -N. X. Medina, A. Brunthaler, K. M. Menten, F. Wyrowski, W. D. Cotton, R. Dokara, G. N. Ortiz-León, M. R. Rugel, H. N… 展开作者
S. A. Dzib, A. Y. Yang, J. S. Urquhart, S. -N. X. Medina, A. Brunthaler, K. M. Menten, F. Wyrowski, W. D. Cotton, R. Dokara, G. N. Ortiz-León, M. R. Rugel, H. Nguyen, Y. Gong, A. Chakraborty, H. Beuther, S. J. Billington, C. Carrasco-Gonzalez, T. Csengeri, P. Hofner, J. Ott, J. D. Pandian, N. Roy, V. Yanza
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25 pages, 15 figures, and 6 tables, Accepted for publication in the Astronomy \& Astrophysics
As part of the GLOSTAR survey we have used the VLA in its B-configuration to observe the part of the Galactic plane between longitudes of 28d and 36d and latitudes from -1d to +1d at the C-band (4--8 GHz). To reduce the contamination of extended sources that are not well recovered by our coverage of the (u, v)-plane we discarded short baselines that are sensitive to emission on angular scales $<4"$. The resulting radio continuum images have an angular resolution of 1.0", and sensitivity of $\sim60 μ$Jy~beam$^{-1}$; making it the most sensitive radio survey covering a large area of the Galactic plane with this angular resolution. An automatic source extraction algorithm was used in combination with visual inspection to identify a total of 3325 radio sources. A total of 1457 radio sources are $\geq7σ$ and comprise our highly reliable catalog; 72 of these are grouped as 22 fragmented sources, e.g., multiple components of an extended and resolved source. To explore the nature of the catalogued radio sources we searched for counterparts at millimeter and infrared wavelengths. Our classification attempts resulted in 93 HII region candidates, 104 radio stars, 64 planetary nebulae, while most of the remaining radio sources are suggested to be extragalactic sources. We investigated the spectral indices ($α$, $S_ν\proptoν^α$) of radio sources classified as HII region candidates and found that many have negative values. This may imply that these radio sources represent young stellar objects that are members of the star clusters around the high mass stars that excite the HII regions, but not these HII regions themselves. By comparing the peak flux densities from the GLOSTAR and CORNISH surveys we have identified 49 variable radio sources, most of them with an unknown nature. Additionally, we provide the list of 1866 radio sources detected within 5 to 7$σ$ levels.
A global view on star formation: The GLOSTAR Galactic plane survey. IX. Radio Source Catalog III: 2<l<28, 36<l<40, 56<l<60 and |b|<1, VLA B-configuration
A global view on star formation: The GLOSTAR Galactic plane survey. XI. Radio source catalog IV: $2^\circ < \ell < 28^\circ$, $36^\circ < \ell < 60^\circ$ and $|b| < 1^\circ$
A global view on star formation: The GLOSTAR Galactic plane survey XII. Effelsberg's continuum view and data release
Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；National Radio Astronomy Observatory（国家射电天文台）；Center for Astrophysics | Harvard & Smithsonian（哈佛史密森尼天体物理中心）
A global view on star formation: The GLOSTAR Galactic plane survey IV. Radio continuum detections of young stellar objects in the Galactic Centre region
中央分子带（CMZ）是银河系中心周围的一个$\sim$ 200 pc大小的区域，它的特殊之处在于它显示出恒星形成率（SFR）相对于可用的致密气体受到抑制。为了研究CMZ中的SFR，可以研究年轻恒星物体（YSO）。在这里，我们提出了334个2.2 $μ$ m红外源已被确定为YSO候选人的无线电观测。我们的目标是调查厘米波长的无线电连续对应的存在下，这个样本的YSO候选人，我们用来约束当前的SFR在CMZ。作为GLOSTAR巡天的一部分，获得了银河系中心的D型VLA数据，包括-2 $^{\circ}<l<$ 2 $^{\circ}$和-1 $^{\circ}<b<$ 1 $^{\circ}$，频率覆盖范围为4-8 GHz。我们根据选择标准将YSO与无线电连续源进行匹配，并将这些无线电源归类为潜在的HII区域，并确定其物理特性。在334个YSO候选者中，我们发现了35个无线电连续谱对应物。我们发现，94个YSO与密集的尘埃凝聚在870 $μ$米ATLASGAL调查，其中14个有一个GLOSTAR对应。在35个有射电对应的YSO中，根据它们的光谱指数和文献，有11个被确认为HII区。我们估计了他们的莱曼连续谱光子通量，以估计电离恒星的质量。将这些数据与已知来源结合起来，计算出CMZ现今的SFR为$\sim$ 0.068 M $_{\odot}$ yr $^{-1}$，是银河SFR的$\si…
The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Perseus Protostars. VI. Characterizing the Formation Mechanism for Close Multiple Systems
VLA FRAMEx. III. Circumnuclear Radio Emission Mechanisms in Hard X-ray Selected Active Galactic Nuclei
The George Washington University（乔治华盛顿大学）；Space Telescope Science Institute（太空望远镜科学研究所）；University of Maryland Baltimore County（马里兰大学巴尔的摩县分校）；Arlington Public Schools（阿灵顿公立学校）
DG Tau B是一个I类年轻恒星源，驱动着不对称的HH 159双极喷流。在可见光波段，它被星周光学厚度的物质所遮蔽。使用VLA和JVLA观测，我们确定了第一次这个源的自行，并发现它们是一致的，误差范围内，与附近的年轻恒星DG头。我们还讨论了一个喷射事件，这是明显的，在1994年的VLA数据。作为光学和分子外流，这种喷射跟踪在无线电连续谱是显着不对称的，只检测到的西北部的恒星。我们建议，这个结，不再检测到的无线电，可以观察到在未来的光学图像的DG头B。VLA源和附近红外目标的位置不重合，我们认为VLA源跟踪激发目标，而红外源可能是反射波瓣。
A JWST, ALMA and VLA survey of the Ophiuchus-A star-forming region: Unveiling hidden dust mass and connecting infrared outflows to their radio origins
University of Leeds（利兹大学）；Universitat de Barcelona（巴塞罗那大学）；Institut d’Estudis Espacials de Catalunya（加泰罗尼亚空间研究所）；National Sun Yat-Sen University（国立中山大学）；National Taiwan Normal University（国立台湾师范大学）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）
HIghMass - High HI Mass, HI-rich Galaxies at z~0: High-Resolution VLA Imaging of UGC 9037 and UGC 12506
我们提出了解决HI观测两个星系，UGC 9037和UGC 12506，成员的一个罕见的星系子集的ALUFA河外HI调查的特点是高HI质量和高气体分数为他们的恒星质量。这两个星系都有M $_*>10^{10}$ M $_\odot$和M $_\text{HI}>$ M $_*$，以及它们的恒星质量的典型恒星形成率。这样的星系是如何避免消耗它们巨大的气体储备的呢？从气体运动学，稳定性，恒星形成，和暗物质分布的两个星系，我们推断两个根本不同的历史。UGC 9037具有高的中心HI表面密度（$>10$ M $_\odot$ pc $^{-2}$）。它的气体在大多数半径似乎是边缘不稳定的非圆形流动通过磁盘。这些性质与UGC 9037最近获得的气体一致，并且它很快就会经历主要的恒星形成。UGC 12506的HI表面密度较低，其气体在大部分圆盘上都是稳定的。我们预测，除了最小半径外，它的气体都是HI主导的。我们声称UGC 12506（$λ=0.15$）的暗物质晕自旋参数非常高，这表明它的气体年龄更大，并且从未经历过足以消耗其大部分气体的恒星形成时期。
Detections of Compact Radio Continuum toward Methanol Maser Rings Using the VLA
Nicolaus Copernicus University（尼古拉·哥白尼大学）；SKA Observatory（平方公里阵列射电望远镜天文台）；INAF – Osservatorio Astronomico di Cagliari（意大利国家天体物理研究所-卡利亚里天文台）；INAF – Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所-阿尔切特里天文台）；Joint Institute for VLBI ERIC（甚长基线干涉测量联合研究所）；Leiden University（莱顿大学）
