Results 1 to 10 of about 946 (216)
The role of thermal and non-thermal processes in the ISM of the Magellanic Clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Radio continuum emission is a dust-unbiased tracer of both thermal and non-thermal processes in the interstellar medium. We present new maps of the free–free and synchrotron emission in the Magellanic Clouds (MCs) at 0.166, 1.4, and 4.8 GHz with no prior assumption about the radio non-thermal spectrum.
H Hassani +6 more
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Dark dust and single-cloud sightlines in the ISM [PDF]
Astronomy & Astrophysics, 2020 The precise characteristics of clouds and the nature of dust in the diffuse interstellar medium can only be extracted by inspecting the rare cases of single-cloud sightlines. In our nomenclature such objects are identified by interstellar lines, such as K I, that show at a resolving power of λ∕Δλ ~ 75 000 one dominating Doppler component that accounts ...
R. Siebenmorgen +4 more
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Tiny H I clouds in the local ISM [PDF]
Astronomy & Astrophysics, 2005 We report deep, high spectral resolution WSRT HI 21cm observations of four high latitude compact radio sources, that have revealed a new population of tiny, discrete clouds in the diffuse ISM, with peak optical depths tau ~ 0.1-2%, HI column densities of 0.4-8 * 10^{18} cm^{-2} and core temperatures of 20-80 K.
Braun, Robert, Kanekar, Nissim
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Cloud-scale ISM Structure and Star Formation in M51 [PDF]
The Astrophysical Journal, 2017 AbstractWe compare the structure of molecular gas at 40 pc resolution to the ability of gas to form stars across the disk of the spiral galaxy M51. We break the PAWS survey into 370 pc and 1.1 kpc resolution elements, and within each we estimate the molecular gas depletion time (), the star-formation efficiency per free-fall time (), and the mass ...
Leroy, Adam +19 more
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Cloud Properties and Correlations with Star Formation in Numerical Simulations of the Three-Phase ISM [PDF]
The Astrophysical Journal, 2019 31 pages, 17 figures, submitted to ...
Mao, S. Alwin +2 more
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The 10- m profile of molecular-cloud and diffuse ISM silicate dust [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 High signal-to-noise ratio spectra are presented of the 10-μm silicate absorption feature in lines of sight towards Elias 16 and 18 in the Taurus dark cloud, and towards the heavily reddened supergiant Cyg OB2 no. 12. The observations are fitted with laboratory and astronomical spectra to produce intrinsic absorption profiles.
J. E. Bowey +2 more
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From giant clumps to clouds – III. The connection between star formation and turbulence in the ISM
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Supersonic gas turbulence is a ubiquitous property of the interstellar medium. The level of turbulence, quantified by the gas velocity dispersion (σg), is observed to increase with the star formation rate (SFR) of a galaxy, but it is yet not established whether this trend is driven by stellar feedback or gravitational ...
Timmy Ejdetjärn +4 more
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VLT/FLAMES-ARGUS observations of stellar wind--ISM cloud interactions in NGC 6357 [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We present optical/near-IR IFU observations of a gas pillar in the Galactic HII region NGC 6357 containing the young open star cluster Pismis 24. These observations have allowed us to examined in detail the gas conditions of the strong wind-clump interactions taking place on its surface. We identify the presence of a narrow (~20 km/s) and broad (50-150
Westmoquette, M. S. +3 more
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Cloud Statistics in Numerical Simulations of the ISM
, 1996 Gzipped, tarred Latex file (4 pages), 6 Postscript figures and one style file. Uses AAS macros. Gzipped Postscript file also available at ftp://kepler.astroscu.unam.mx/incoming/enro/papers/cloudstat.ps ...
Ballesteros-Paredes, J. +1 more
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Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Turbulence plays a crucial role in shaping the structure of the interstellar medium. The ratio of the three-dimensional density contrast ($\sigma _{\rho /\rho _0}$) to the turbulent sonic Mach number ($\mathcal {M}$) of an isothermal, compressible gas describes the ratio of solenoidal to compressive modes in the turbulent ...
Isabella A Gerrard +14 more
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