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We present the results of CS J=2-1 mapping observations towards 39 massive star-forming regions selected from the previous CO line survey of cold IRAS sources with high-velocity CO flows along the Galactic plane (Yang et al. 2002). All…

Solar and Stellar Astrophysics · Physics 2018-11-14 Yiping Ao , Ji Yang , Kenichi Tatematsu , Christian Henkel , Kazuyoshi Sunada , Quang Nguyen-Luong

Feedback and outflows in galaxies that are associated with a quasar phase are expected to be pivotal in quenching the most massive galaxies. However, observations targeting the molecular outflow phase, which dominates both the mass and…

We present ALMA follow-up observations of two massive, early-stage core candidates, C1-N & C1-S, in Infrared Dark Cloud (IRDC) G028.37+00.07, which were previously identified by their N2D+(3-2) emission and show high levels of deuteration…

Astrophysics of Galaxies · Physics 2016-04-20 Jonathan C. Tan , Shuo Kong , Yichen Zhang , Francesco Fontani , Paola Caselli , Michael J. Butler

We present a survey toward 16 Low Luminosity Objects (LLOs with an internal luminosity, Lint, lower than 0.2 Lsun) with N2H+ (1-0), N2H+ (3-2), N2D+ (3-2), HCO+ (3-2) and HCN (3-2) using the Arizona Radio Observatory Kitt Peak 12m Telescope…

Astrophysics of Galaxies · Physics 2015-06-24 Tien-Hao Hsieh , Shih-Ping Lai , Arnaud Belloche , Friedrich Wyrowski , Chao-Ling Hung

An unbiased search of molecular outflows within the region of the COHRS survey has identified 157 high-mass outflows from a sample of 770 ATLASGAL clumps with a detection rate of 20\%. The detection rate of outflows increases for clumps…

Astrophysics of Galaxies · Physics 2018-11-28 Qiang Li , Jianjun Zhou , Jarken Esimbek , Yuxin He , W. A. Baan , Dalei Li , Gang Wu , Xindi Tang , Weiguang Ji

Context. The formation processes of massive stars are still unclear but a picture is emerging involving accretion disks and molecular outflows in what appears to be a scaled-up version of low-mass star formation. A census of outflow…

Using the IRAC images from the Spitzer c2d program, we have made a survey of mid-infrared outflows in the rho Ophiuchi molecular cloud. Extended objects that have prominent emission in IRAC channel 2 (4.5 micron) compared to IRAC channel 1…

Solar and Stellar Astrophysics · Physics 2015-05-14 Miaomiao Zhang , Hongchi Wang

We present the results of an outflow and infall survey towards a distance limited sample of 31 massive star forming regions drawn from the RMS survey. The presence of young, active outflows is identified from SiO (8-7) emission and the…

Astrophysics of Galaxies · Physics 2018-04-04 Nichol Cunningham , Stuart Lumsden , Toby Moore , Luke Maud , Ignacio. Mendigutia

We present 1.05 mm ALMA observations of the deeply embedded high-mass protocluster G11.92-0.61, designed to search for low-mass cores within the accretion reservoir of the massive protostars. Our ALMA mosaic, which covers an extent of ~0.7…

Astrophysics of Galaxies · Physics 2017-05-10 C. J. Cyganowski , C. L. Brogan , T. R. Hunter , R. Smith , J. M. D. Kruijssen , I. A. Bonnell , Q. Zhang

We present new high spatial resolution Karl G. Jansky Very Large Array (VLA) HI absorption and Very Long Baseline Array (VLBA) continuum observations of the Active Galactic Nucleus (AGN)-driven molecular outflow candidate NGC 1266. Although…

We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 12CO(1-0) and 12CO(2-1) in the central 40" (680 pc) of the nuclear starburst galaxy NGC 253, including its molecular outflow. We measure the ratio of brightness…

With the recent recognition of a second, distinctive class of molecular outflows, namely the explosive ones not directly connected to the accretion-ejection process in the star formation, a juxtaposition of the morphological and kinematic…

Solar and Stellar Astrophysics · Physics 2017-02-22 Luis A. Zapata , Johannes Schmid-Burgk , Luis F. Rodriguez , Aina Palau , Laurent Loinard

We present single pointing observations of SiO, HCO$^+$ and H$^{13}$CO$^+$ from the James Clerk Maxwell Telescope towards 23 massive star forming regions previously known to contain molecular outflows and ultracompact HII regions. We…

Astrophysics · Physics 2019-08-19 P. D. Klaassen , C. D. Wilson

The results of a deep mid-IR ISOCAM survey of the L1551 dark molecular cloud are presented. The aim of this survey is a search for new YSO (Young Stellar Object) candidates, using two broad-band filters centred at 6.7 and 14.3 micron.…

We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2 kpc. Based on IRAC and MIPS 24 $\mu$m photometric results and 2MASS JHKs data, we carry out a…

The goal of the Protostellar Outflows at the EarliesT Stages (POETS) survey is to image the disk-outflow interface on scales of 10-100 au in a statistically significant sample (36) of luminous young stellar objects (YSO), targeting both the…

Solar and Stellar Astrophysics · Physics 2019-10-23 Luca Moscadelli , Alberto Sanna , Ciriaco Goddi , Vasaant Krishnan , Fabrizio Massi , Francesca Bacciotti

We discuss wide-field near-IR imaging of the NGC1333, L1448, L1455 and B1 star forming regions in Perseus. The observations have been extracted from a much larger narrow-band imaging survey of the Taurus-Auriga-Perseus complex. These H2…

Astrophysics · Physics 2009-06-23 C. J. Davis , P. Scholz , P. Lucas , M. D. Smith , A. Adamson

We present constraints on the molecular outflows in a sample of five Hyper-Luminous Infrared Galaxies using Herschel observations of the OH doublet at 119 {\mu}m. We have detected the OH doublet in three cases: one purely in emission and…

Astrophysics of Galaxies · Physics 2016-07-27 D. Calderón , F. E. Bauer , S. Veilleux , J. Graciá-Carpio , E. Sturm , P. Lira , S. Schulze , S. Kim

The results are presented of a molecular line survey to search for the spectral signature of infall towards 77 850 micron continuum sources believed to be candidate high mass protostellar objects. Up to six different transitions, HCO+ 1-0,…

Astrophysics · Physics 2009-11-11 G. A. Fuller , S. J. Williams , T. K. Sridharan