Detection of ~0.05 km/s ion-neutral velocity drift in L1544 interpreted as the first observational signature of ambipolar diffusion in a prestellar core.
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Self-generated electric fields from deposited cosmic ray electrons can reduce their penetration into molecular clouds by factors of a few to a few hundred in high-ionization environments.
For compressively forced supersonic turbulence, the density PDF broadens and becomes more negatively skewed when the driving correlation time is comparable to the eddy turnover time, because sustained compressive accelerations create large low-density voids.
Cosmic rays heat inner gas clouds in NGC 5728 and boost low-ionization optical and certain mid-IR lines while high-ionization lines remain insensitive, enabling multi-wavelength separation of CR, shock, and metallicity effects.
Deuterium fractions of HCN, HNC, and N2H+ trace the evolutionary age of 23 starless cores, while 14N/15N in HCN and HNC differ and appear to drop during star formation.
High CR ionization rates (above 10^-13 s^-1) in AGN and starburst models produce enhanced low-ionization emission that matches observations without super-solar metallicities and suggests revised BPT diagram boundaries.
citing papers explorer
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Probing the ion-neutral drift velocity towards the L1544 prestellar core: Detection of ambipolar diffusion using N$_2$D$^+$ and para-NH$_2$D
Detection of ~0.05 km/s ion-neutral velocity drift in L1544 interpreted as the first observational signature of ambipolar diffusion in a prestellar core.
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Exclusion of cosmic rays from molecular clouds by self-generated electric fields
Self-generated electric fields from deposited cosmic ray electrons can reduce their penetration into molecular clouds by factors of a few to a few hundred in high-ionization environments.
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The Density Distribution of Compressively-Forced Supersonic Turbulence Depends on the Driving Correlation Time
For compressively forced supersonic turbulence, the density PDF broadens and becomes more negatively skewed when the driving correlation time is comparable to the eddy turnover time, because sustained compressive accelerations create large low-density voids.
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Cosmic-ray impact on optical and mid-infrared emission line diagnostics in NGC 5728
Cosmic rays heat inner gas clouds in NGC 5728 and boost low-ionization optical and certain mid-IR lines while high-ionization lines remain insensitive, enabling multi-wavelength separation of CR, shock, and metallicity effects.
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Gas-phase Elemental abundances in Molecular cloudS (GEMS) XI. The evolution of HCN, HNC, and N2H+ isotopic ratios in starless cores
Deuterium fractions of HCN, HNC, and N2H+ trace the evolutionary age of 23 starless cores, while 14N/15N in HCN and HNC differ and appear to drop during star formation.
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Cosmic Ray Ionization of Low-Excitation Lines in Active Galactic Nuclei and Starburst Galaxies
High CR ionization rates (above 10^-13 s^-1) in AGN and starburst models produce enhanced low-ionization emission that matches observations without super-solar metallicities and suggests revised BPT diagram boundaries.