Results 251 to 260 of about 3,566,597 (273)
Thermal Pressure in the Cold Neutral Medium of Nearby Galaxies [PDF]
Astrophysical Journal, 2017 Abstract Dynamic and thermal processes regulate the structure of the multiphase interstellar medium (ISM), and ultimately establish how galaxies evolve through star formation. Thus, to constrain ISM models and better understand the interplay of these processes, it is of great interest to measure the thermal pressure (
Alison Crocker +2 more
exaly +9 more sources
A multiwavelength investigation of the temperature of the cold neutral medium [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract We present measurements of the H i spin temperatures (Ts) of the cold neutral medium (CNM) towards radio sources that are closely aligned with stars for which published H2 ortho-para temperatures (T01) are available from ultraviolet (UV) observations. Our sample consists of 18 radio sources close to 16 nearby stars.
Nirupam Roy +2 more
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Necessary conditions for the formation of filaments and star clusters in the cold neutral medium [PDF]
Monthly Notices of the Royal Astronomical SocietyABSTRACT Star formation takes place in filamentary molecular clouds which arise by physical processes that take place in the cold neutral medium (CNM). We address the necessary conditions for this diffuse (n ≈ 30 cm−3), cold (T ≈ 60 K), magnetized gas undergoing shock waves, and supersonic turbulence, to produce filamentary structures ...
Ralph Pudritz, Rachel Pillsworth
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On the distribution of the cold neutral medium in galaxy discs
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT The cold neutral medium (CNM) is an important part of the galactic gas cycle and a precondition for the formation of molecular and star-forming gas, yet its distribution is still not fully understood. In this work, we present extremely high resolution simulations of spiral galaxies with time-dependent chemistry such that we can ...
Simon Glover +2 more
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Astrophysical Journal, 2022 Abstract Using new large-area maps of the cold neutral medium (CNM) fraction, f CNM, we investigate the relationship between the CNM, the abundance of polycyclic aromatic hydrocarbons (PAHs), and the anomalous microwave emission (AME).
Brandon S. Hensley, Claire Murray
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Tiny-Scale Atomic Structure and the Cold Neutral Medium
Astrophysical Journal, 1997 We consider the tiny-scale atomic structure (TSAS) on scales of tens of astronomical units, which has been detected by 21 cm absorption lines against quasars with VLBI techniques, against pulsars with time variability and against close binary stars in optical interstellar lines. The TSAS is associated with ordinary cold neutral medium (the CNM).
Carl E. Heiles
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THE THERMAL PRESSURE DISTRIBUTION OF A SIMULATED COLD NEUTRAL MEDIUM
Astrophysical Journal, 2014 We numerically study the thermal pressure distribution in a gas with thermal properties similar to those of the cold neutral interstellar gas by analyzing three-dimensional hydrodynamic models in boxes with sides of 100 pc with turbulent compressible forcing at 50 pc and different Mach numbers. We find that at high pressures and for large Mach numbers,
Adriana Gazol
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The Structure of the Cold Neutral Interstellar Medium on 10–100 AU Scales [PDF]
Astronomical Journal, 2001 We have used the Very Long Baseline Array (VLBA) and the Very Large Array (VLA) to image Galactic neutral hydrogen in absorption toward four compact extragalactic radio sources with a resolution of 10 mas. Previous VLBA data published by Faison et al. have shown the existence of prominent structures in the direction of the extragalactic source 3C 138 ...
W M Goss
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