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Infrared Dark Clouds (IRDCs) are very dense and highly extincted regions that host the initial conditions of star and stellar cluster formation. It is crucial to study the kinematics and molecular content of IRDCs to test their formation…

Astrophysics of Galaxies · Physics 2020-10-21 G. Cosentino , I. Jiménez-Serra , J. D. Henshaw , P. Caselli , S. Viti , A. T. Barnes , J. C. Tan , F. Fontani , B. Wu

The combination of the high-resolution ALMA, JWST and HST observations provides unprecedented insights into the connection between individual molecular clouds and their internal stellar populations in nearby galaxies. The molecular clouds…

Astrophysics of Galaxies · Physics 2025-07-01 J. W. Zhou , Pavel Kroupa , Sami Dib

The aim of our study is to investigate the physical properties of the star-forming interstellar medium (ISM) in the Large Magellanic Cloud (LMC) by separating the origin of the emission lines spatially and spectrally. Following Okada et al.…

In the interstellar medium (ISM), the formation of complex organic molecules (COMs) is largely facilitated by surface reactions. However, in cold dark clouds, thermal desorption of COMs is inefficient because of the lack of thermal energy…

Astrophysics of Galaxies · Physics 2022-09-07 Alec Paulive , Joshua T. Carder , Eric Herbst

Aims: We aim to understand the fragmentation as well as the disk formation, outflow generation and chemical processes during high-mass star formation on spatial scales of individual cores. Methods: Using the IRAM Northern Extended…

We present the first high angular resolution study of giant molecular clouds (GMCs) in the nearby spiral galaxy NGC 300, based on observations from the Submillimeter Array (SMA). We target eleven 500 pc-sized regions of active star…

Astrophysics of Galaxies · Physics 2016-04-28 Christopher Faesi , Charles Lada , Jan Forbrich

In this work we simulate the $50-200$ MHz radio sky that is constrained in the field of view ($5^{\circ}$ radius) of the 21 Centimeter Array (21CMA), by carrying out Monte-Carlo simulations to model redshifted cosmological reionization…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Jingying Wang , Haiguang Xu , Junhua Gu , Tao An , Haijuan Cui , Jianxun Li , Zhongli Zhang , Qian Zheng , Xiang-Ping Wu

We report the results of a new large scale survey of the Orion-Monoceros complex of molecular clouds made in the J = 1->0 line of CO with the Harvard-Smithsonian 1.2m millimetre-wave telescope. The survey consists of 52,288 uniformly spaced…

Astrophysics · Physics 2009-11-10 B. A. Wilson , T. M. Dame , M. R. W. Masheder , P. Thaddeus

We present maps of the cosmic large-scale structure around the twelve most distant galaxy clusters from the Massive Cluster Survey (MACS) as traced by the projected surface density of galaxies on the cluster red sequence. Taken with the…

Astrophysics · Physics 2009-11-13 Jeyhan S. Kartaltepe , Harald Ebeling , C. J. Ma , David Donovan

Molecular clouds have complex density structures produced by processes including turbulence and gravity. We propose a triangulation-based method to dissect the density structure of a molecular cloud and study the interactions between dense…

Astrophysics of Galaxies · Physics 2022-04-04 Guang-Xing Li , Yue Cao , Keping Qiu

We use deep $8\:\mu m$ Spitzer-IRAC imaging of a massive Infrared Dark Cloud (IRDC) G028.37+00.07 to construct a Mid-Infrared (MIR) extinction map that probes mass surface densities up to $\Sigma\:\sim 1\:\rm{g~cm^{-2}}$…

Solar and Stellar Astrophysics · Physics 2015-06-18 Michael J. Butler , Jonathan C. Tan , Jouni Kainulainen

We present high spatial resolution ($\approx24$ pc) Atacama Large Millimeter/sub-millimeter Array $^{12}$CO(2-1) observations of the central region of the nearby barred spiral galaxy NGC 5806. NGC 5806 has a highly structured molecular gas…

Our search for the earliest stages of massive star formation turned up twelve massive pre-protocluster candidates plus a few protoclusters. For this search, we selected 47 FIR-bright IRAS sources in the outer Galaxy. We mapped regions of…

Astrophysics · Physics 2009-11-11 R. Klein , B. Posselt , K. Schreyer , J. Forbrich , Th. Henning

Galaxy morphology encodes key information about formation and evolution. Large imaging surveys require automated, reproducible methods beyond visual inspection. Non--parametric indices provide an useful framework, but their performance must…

We present $\mathrm{^{12}CO}$ and $\mathrm{^{13}CO}$ molecular gas data observed by ALMA, massive early stage young stellar objects identified by applying color-magnitude cuts to \textit{Spitzer} and \textit{Herschel} photometry, and…

Astrophysics of Galaxies · Physics 2022-02-09 Omnarayani Nayak , Margaret Meixner , Remy Indebetouw , Guido De Marchi , Anton Koekemoer , Nino Panagia , Elena Sabbi

We report the results of our observations of the 12CO (J=1-0) and 12CO (J=3-2) line emission of 74 major giant molecular clouds (GMCs) within the galactocentric distance of 5.1 kpc in the Local Group galaxy M33. The observations have been…

The accumulation, compression and cooling of the ambient interstellar medium (ISM) in large-scale flows powered by OB cluster feedback can drive the production of dense molecular clouds. We review the current state of the field, with a…

Astrophysics of Galaxies · Physics 2013-04-10 J. R. Dawson

We use high spatial resolution observations of CO to systematically measure the resolved size-line width, luminosity-line width, luminosity-size, and the mass-luminosity relations of Giant Molecular Clouds (GMCs) in a variety of…

Astrophysics · Physics 2009-11-13 Alberto D. Bolatto , Adam K. Leroy , Erik Rosolowsky , Fabian Walter , Leo Blitz

We present calculations of molecular, atomic and ionic line emission from simulations of giant molecular cloud (GMC) collisions. We post-process snapshots of the magneto-hydrodynamical simulations presented in an earlier paper in this…

Astrophysics of Galaxies · Physics 2017-11-29 Thomas G. Bisbas , Kei E. I. Tanaka , Jonathan C. Tan , Benjamin Wu , Fumitaka Nakamura

Context. Weak lensing and clustering statistics beyond two-point functions can capture non-Gaussian information about the matter density field, thereby improving the constraints on cosmological parameters relative to the mainstream methods…