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We used the Green Bank Telescope to detect molecular lines observed toward Mid-Infrared (MIR) bubbles N62, N65, N90, and N117. The bubbles were selected from Watson et al. (2016) who detected non-Gaussian CS (1-0) emission lines toward the…

Astrophysics of Galaxies · Physics 2018-07-25 Kathryn Devine , Johanna Mori , Christer Watson , Leonardo Trujillo , Matthew Hicks

We present new 3-mm continuum and molecular lines observations from the ATOMS survey towards the massive protostellar clump, MM1, located in the filamentary infrared dark cloud (IRDC), G034.43+00.24 (G34). The lines observed are the tracers…

We analyze Spitzer GLIMPSE, MSX, and WMAP images of the Milky Way to identify 8 micron and free-free sources in the Galaxy. Seventy-two of the eighty-eight WMAP sources have coverage in the GLIMPSE and MSX surveys suitable for identifying…

Astrophysics of Galaxies · Physics 2015-06-04 E. J. Lee , N. Murray , M. Rahman

Rich in HII regions, giant molecular clouds are natural laboratories to study massive stars and sequential star formation. The Galactic star forming complex W33 is located at l=~12.8deg and at a distance of 2.4 kpc, has a size of ~10 pc and…

[DBS2003]179 is a super star cluster in the Galaxy discovered by deep near infrared observations. We carried out CO J=1-0 and J=3-2 observations of the region of [DBS2003]179 with NANTEN2, ASTE and the Mopra 22m telescope. We identified and…

Astrophysics of Galaxies · Physics 2020-05-06 Sho Kuwahara , Kazufumi Torii , Norikazu Mizuno , Shinji Fujita , Mikito Kohno , Yasuo Fukui

We present the first interferometric CO(J=1->0) map of the entire H-alpha disk of M33. The 13" diameter synthesized beam corresponds to a linear resolution of 50 pc, sufficient to distinguish individual giant molecular clouds (GMCs). From…

Astrophysics · Physics 2009-11-10 G. Engargiola , R. Plambeck , E. Rosolowsky , L. Blitz

Cloud-cloud collisions (CCCs) are expected to compress gas and trigger star formation. However, it is not well understood how the collisions and the induced star formation affect galactic-scale properties. By developing an on-the-fly…

Astrophysics of Galaxies · Physics 2024-03-11 Shu Horie , Takashi Okamoto , Asao Habe

We present a new catalogue of 578 OB cluster (OBC) candidates in the Andromeda galaxy (M31), identified using a MeanShift-based algorithm on HST's F275W-band imaging from the PHAT (Dalcanton et al. 2012) and PHAST (Chen et al. 2025) Hubble…

Astrophysics of Galaxies · Physics 2025-09-04 Yuan Liang , Guang-Wei Li , Chao-Wei Tsai , Jingwen Wu

We present sub-arcsecond observations toward the massive star forming region G75.78+0.34. We used the Very Large Array to study the centimeter continuum and H2O and CH3OH maser emission, and the Owens Valley Radio Observatory and…

Astrophysics of Galaxies · Physics 2015-06-15 Alvaro Sanchez-Monge , Stan Kurtz , Aina Palau , Robert Estalella , Debra Shepherd , Susana Lizano , Jose Franco , Guido Garay

We present an analysis of the systematic CO(2-1) survey at 12" resolution covering most of the local group spiral M 33 which, at a distance of 840 kpc, is close enough that individual giant molecular clouds (GMCs) can be identified. The…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 P. Gratier , J. Braine , N. J. Rodriguez-Fernandez , K. F. Schuster , C. Kramer , E. Corbelli , F. Combes , N. Brouillet , P. P. van der Werf , M. Röllig

This paper reports on the detection of a likely explosive outflow in the high-mass star-forming complex G34.26+0.15, adding to the small number (six) of explosive outflows detected so far. ALMA CO(2-1) and SiO(5-4) archival observations…

Solar and Stellar Astrophysics · Physics 2025-04-23 Namitha Issac , Xing Lu , Tie Liu , Luis A Zapata , Hong-Li Liu , Anandmayee Tej , Yan-Kun Zhang , Wenyu Jiao , Suinan Zhang

G351.16+0.70 is a relatively well-studied High Mass Star Forming Region with at least two main bipolar outflow structures originating from an OB embedded star and multiple IR cores. Using high-resolution and large bandwidth SMA…

Astrophysics of Galaxies · Physics 2023-03-07 O. S. Rojas-García , A. I. Gómez-Ruiz , A. Palau , M. T. Orozco-Aguilera , S. E. Kurtz , M. Chavez Dagostino

We present high-resolution (~2-3"; ~0.1 pc) radio observations of the Galactic center cloud M0.10-0.08 using the Very Large Array at K and Ka band (~25 and 36 GHz). The M0.10-0.08 cloud is located in a complex environment near the Galactic…

Astrophysics of Galaxies · Physics 2022-09-21 Natalie O. Butterfield , Cornelia C. Lang , Adam Ginsburg , Mark R. Morris , Juergen Ott , Dominic A. Ludovici

Cloud-scale surveys of molecular gas reveal the link between molecular clouds properties and star formation (SF) across a range of galactic environments. Cloud populations in galaxy disks are considered to be representative of the `normal'…

We present maps and a catalogue containing the J=1-0 12CO parameters of 29 individual molecular clouds in the second-brightest LMC star formation complex, N11. In the southwestern part of N11, molecular clouds occur in a ring or shell…

Collisions between giant molecular clouds are a potential mechanism for triggering the formation of massive stars, or even super star clusters. The trouble is identifying this process observationally and distinguishing it from other…

Astrophysics of Galaxies · Physics 2015-06-24 T. J. Haworth , E. J. Tasker , Y. Fukui , K. Torii , J. E. Dale , K. Shima , K. Takahira , A. Habe , K. Hasegawa

We carried out a molecular line study toward the three Spitzer bubbles S116, S117 and S118 which show active formation of high-mass stars. We found molecular gas consisting of two components with velocity difference of {$\sim 5$ \kms}. One…

The winds and radiation from massive stars clear out large cavities in the interstellar medium. These bubbles, as they have been called, impact their surrounding molecular clouds and may influence the formation of stars therein. Here we…

Astrophysics of Galaxies · Physics 2014-11-20 Christopher N. Beaumont , Jonathan P. Williams

This work aims at investigating the characteristics of the molecular gas associated with the nebula G18.8+1.8, linked to the Wolf-Rayet star HD168206 (WR 113), and its relation to other components of its local interstellar medium. We…

Astrophysics of Galaxies · Physics 2015-06-04 J. Vasquez , M. Rubio , C. E. Cappa , N. U. Duronea

This paper investigates the impact of radiative and mechanical feedback from O-type stars on their parent molecular clouds and the triggering of formation of future generation of stars. We study the infrared bubble S111 created by the…

Astrophysics of Galaxies · Physics 2022-02-16 Bhaswati Mookerjea