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Ultraviolet and optical spectra of interstellar gas along the lines of sight to nearby stars have been interpreted by Redfield & Linsky (2008) and previous studies as a set of discrete warm, partially ionized clouds each with a different…

Astrophysics of Galaxies · Physics 2015-10-21 Seth Redfield , Jeffrey L. Linsky

We present a comprehensive analysis of the multi-phase structure of the interstellar medium (ISM) and the stellar kinematics in the edge-on nearby galaxy UGC 10205 using integral field spectroscopy (IFS) data taken with MEGARA at the GTC.…

We aim to constrain the kinetic temperature and H$_2$ volume density of massive star-forming clumps associated with HII regions using multiple para-H$_2$CO transitions. In addition, we investigate the interplay between ionized gas,…

We recently reported a population of protostellar candidates in the 20 km s$^{-1}$ cloud in the Central Molecular Zone of the Milky Way, traced by H$_2$O masers in gravitationally bound dense cores. In this paper, we report…

We aim to explore the capabilities of dust emission and rays for probing the properties of the interstellar medium in the nearby anti-centre region, using gamma-ray observations with the Fermi Large Area Telescope (LAT), and the thermal…

High Energy Astrophysical Phenomena · Physics 2017-05-10 Q. Remy , I. A. Grenier , D. J. Marshall , J. M. Casandjian

We report the results obtained from a multi-wavelength study of the HII region, G18.148$-$0.283, using the upgraded Giant Metre-wave Radio Telescope (uGMRT) at 1350 MHz along with other archival data. In addition to the radio continuum…

Astrophysics of Galaxies · Physics 2022-01-28 Jyotirmoy Dey , Jagadheep D. Pandian , Dharam Vir Lal

With the aim of investigating the presence of molecular and dust clumps linked to two star forming regions identified in the expanding molecular envelope of the stellar wind bubble RCW78, we analyzed the distribution of the molecular gas…

Astrophysics of Galaxies · Physics 2015-06-17 C. E. Cappa , M. Rubio , G. A. Romero , N. U. Duronea , V. Firpo

We report the detection of hydrogen chloride, HCl, in diffuse molecular clouds on the line of sight towards the star-forming region W31C (G10.6-0.4). The J = 1-0 lines of the two stable HCl isotopologues, H35Cl and H37Cl, are observed using…

Astrophysics of Galaxies · Physics 2016-11-04 R. R. Monje , D. C. Lis , E. Roueff , M. Gerin , M. De Luca , D. A. Neufeld , B. Godard , T. G. Phillips

While most sources above 10^5Lsun have already formed an Ultracompact HII region (UCHII), this is not necessarily the case for sources of lower luminosity. Characterizing sources in the transition phase, i.e., very luminous objects without…

Astrophysics · Physics 2009-11-13 H. Beuther , Q. Zhang , T. R. Hunter , T. K. Sridharan , E. A. Bergin

Molecular hydrogen clouds are a key component of the interstellar medium because they are the birthplaces for stars. They are embedded in atomic gas that pervades the interstellar space. However, the details of how molecular clouds assemble…

Herschel-HIFI spectra of H2O towards low-mass protostars show a distinct velocity component not seen in observations from the ground of CO or other species. The aim is to characterise this component in terms of excitation conditions and…

Solar and Stellar Astrophysics · Physics 2015-06-16 L. E. Kristensen , E. F. van Dishoeck , A. O. Benz , S. Bruderer , R. Visser , S. F. Wampfler

We present results of gasdynamics+N-body constrained cosmological simulations of the Local Supercluster region (LSC; about 30/h Mpc around the Virgo cluster), which closely mimic the real Universe within 100 Mpc by imposing constraints from…

Astrophysics · Physics 2009-11-07 Andrey V. Kravtsov , Anatoly A. Klypin , Yehuda Hoffman

We used newly obtained observations from the Mid-Infrared Instrument (MIRI) equipped with the Medium Resolution Spectrometer (MRS) aboard the James Webb Space Telescope (JWST) to extract spectra covering the entire spectral range from 5 to…

Astrophysics of Galaxies · Physics 2025-11-13 P. Vermot , A. Ciurlo , D. Rouan , M. R. Morris , E. Bron , J. Le Bourlot , F. Le Petit , J. Qiu , A. Togi , A. Ghez T. Do , J. R. Lu

Up to 90% of the chemical reactions during star formation occurs on ice surfaces, probably including the formation of complex organics. Only the most abundant ice species are however observed directly by infrared spectroscopy. This study…

Solar and Stellar Astrophysics · Physics 2015-05-13 Karin I. Oberg , Sandrine Bottinelli , Ewine F. van Dishoeck

We studied the environment of the dust bubble N10 in molecular emission. Infrared bubbles, first detected by the GLIMPSE survey at 8.0 $\mu$m, are ideal regions to investigate the effect of the expansion of the HII region on its…

Astrophysics of Galaxies · Physics 2016-10-18 D. R. G. Gama , J. R. D. Lepine , Y. Wu , J. Yuan , E. Mendoza

We present an analysis of high-resolution far-ultraviolet archival spectra obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope of the star HD 75309, which probes high-velocity shocked gas in the Vela…

Astrophysics of Galaxies · Physics 2023-10-10 Adam M. Ritchey

We present measurements of interstellar H_2 absorption lines in the continuum spectra of seven early-type stars in the Galactic disk at distances between 1 and 4 kpc. Five of these stars provide lines of sight through the Sagittarius spiral…

Astrophysics · Physics 2009-10-30 W. Van Dyke Dixon , Mark Hurwitz , Stuart Bowyer

We present a multi-wavelength analysis of the infrared dust bubble S24, and its environs, with the aim of investigating the characteristics of the molecular gas and the interstellar dust linked to them, and analyzing the evolutionary status…

Astrophysics of Galaxies · Physics 2015-12-16 C. E. Cappa , N. U. Duronea , V. Firpo , J. Vasquez , C. H. López-Caraballo , M. Rubio , M. M. Vazzano

We combine data from our recent FUSE survey of interstellar molecular hydrogen absorption toward 50 high-latitude AGN with COBE-corrected IRAS 100 micron emission maps to study the correlation of infrared cirrus with H2. A plot of the H2…

Astrophysics · Physics 2009-11-13 Kristen Gillmon , J. Michael Shull

To study the demographics of interstellar ices in the Central Molecular Zone (CMZ) of the Milky Way, we obtain near-infrared spectra of $109$ red point sources using NASA IRTF/SpeX at Maunakea. We select the sample from near- and…

Astrophysics of Galaxies · Physics 2022-05-11 Dajeong Jang , Deokkeun An , Kris Sellgren , Solange V. Ramírez , A. C. Adwin Boogert , Mathias Schultheis