Results 51 to 60 of about 1,698,518 (186)
The Astronomical Journal, 2023 We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey.
Katherine L. Rhode +7 more
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The Hi Mass Function of Star-forming Galaxies at z ≈ 1
The Astrophysical Journal LettersWe present the first estimate, based on direct H i 21 cm observations, of the H i mass function (H i MF) of star-forming galaxies at z ≈ 1, obtained by combining our measurement of the scaling relation between H i mass ( M _H _i ) and B -band luminosity (
Aditya Chowdhury +2 more
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The influence of galactic cosmic rays on ion-neutral hydrocarbon chemistry in the upper atmospheres of free-floating exoplanets [PDF]
, 2014 The authors highlight financial support of the European Community under the FP7 by an ERC starting grant.Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry.
P. B. Rimmer +5 more
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Star Formation Drives Production of Low-energy Cosmic Rays
The Astrophysical Journal LettersFor over a century, the origin of low-energy cosmic rays (LECRs), the dominant heaters and ionizers of dense interstellar gas, has remained elusive owing to solar modulation and uncertain transport processes.
Ningyu Tang +20 more
doaj +1 more source
, 2002 Fifteen reactions on the doublet HCnS and singlet/triplet ${\rm H_2C}_n{\rm S} (n=1,2)$ potential energy surfaces have been investigated theoretically via electronic structure calculations to unravel the formation of hydrogen deficient, sulfur bearing ...
M. Yamada, Y. Osamura, R. I. Kaiser
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Neutral hydrogen absorption towards Fast Radio Bursts [PDF]
, 2015 If Fast Radio Bursts (FRBs) are truly at astronomical, in particular cosmological, distances, they represent one of the most exciting discoveries in astrophysics of the past decade.
Oosterloo, T., Fender, R.
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Mapping Galactic Dust Emission and Extinction with H I, H II, and H2
The Astrophysical JournalNeutral hydrogen (H i ) emission closely traces the dust column density at high Galactic latitudes and is thus a powerful tool for predicting dust extinction. However, the relation between H i column density N _HI and high-latitude dust emission observed
Yun-Ting Cheng +3 more
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Magnetic Misalignment of Interstellar Dust Filaments
The Astrophysical Journal, 2023 We present evidence for scale-independent misalignment of interstellar dust filaments and magnetic fields. We estimate the misalignment by comparing millimeter-wave dust-polarization measurements from Planck with filamentary structures identified in ...
Ari J. Cukierman +2 more
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Upper Limits on the Space Density of Intergalactic Neutral Hydrogen Clouds
The Astrophysical Journal, 1981 A survey in the 21 cm line of H I of 153 square degrees of sky out in a distance corresponding to 3000 km s/sup -1/ and with a limiting sensitivity of 3 x 10/sup 6/D/sup 2/ M/sub sun/ has failed to turn up any convincing detections that are unassociated with a visible counterpart.
J. R. Fisher, R. B. Tully
openaire +1 more source
High velocity clouds in nearby disk galaxies [PDF]
, 1993 Clouds of neutral hydrogen in our galaxy with the absolute value of v greater than 100 km/s cover approximately 10 percent of the sky to a limiting column density of 1 x 10(exp 18) cm(exp -2).
Roberts, Morton S. +3 more
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