Results 31 to 40 of about 4,742 (219)
The polarization of millimeter-wave emission lines in dense interstellar clouds
The Astrophysical Journal, 1983 Measurements of linear polarization are reported for thermally excited CO, /sup 13/CO, HCN, and CS in 14 dense clouds which encompass a broad range of physical conditions, gas dynamics, and possible magnetic field structure. Observing techniques are described which are sensitive to polarizations as small as 0.5%, and upper limits this small were ...
P. G. Wannier +2 more
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Electronic spectroscopy of cold ions in a radio-frequency trap [PDF]
, 2010 The low density of ions in mass spectrometers generally precludes direct absorption measurements. The spectrum of ions can nonetheless be obtained by using resonance two-color photofragmentation or multiphoton photofragmentation techniques.
Rudnev, Vitaly S.
core +1 more source
Far-ultraviolet diffuse emission lines from the interstellar medium
The Astrophysical Journal, 1983 The intensity of Si IV lambda1397, O IV) lambda1406, N IV) lambda1488, C IV lambda1549, and O III) lambda1663 diffuse line emission recently detected toward the north galactic pole is compared to the predictions of optically thin, hot plasma emission models.
F. Paresce, B. C. M. Fossi, M. Landini
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Observations of Interstellar Molecular Hydrogen Emission [PDF]
, 1978 NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. A search for interstellar molecular hydrogen emission, as seen in the v = 1 -> 0 S(l) line, is presented.
Beckwith, Steven Van Walter
core +1 more source
Estimating the Oblateness of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion
The Astrophysical Journal Letters, 2023 We derive the oblateness parameter q of the dark matter halo of a sample of gas-rich, face-on disk galaxies. We have assumed that the halos are triaxial in shape but their axes in the disk plane ( a and b ) are equal, so that q = c / a measures the halo ...
Mousumi Das +4 more
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Detection of Millimeter Emission Lines from Interstellar Methyl Cyanide
The Astrophysical Journal, 1971 Millimeter emission lines from interstellar methyl cyanide transitions, noting kinetic temperature and hydrogen ...
P. M. Solomon +3 more
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The [C II] line emission as an interstellar medium probe in the MARIGOLD galaxies
Astronomy & AstrophysicsContext. The [C II] fine-structure line at 157.74 μm is one of the brightest far-infrared emission lines in galaxies and an important probe of galaxy properties such as the star formation rate (SFR) and the molecular gas mass (Mmol). Aims. Using high-resolution numerical simulations, we tested the reliability of the [C II] line as a tracer of Mmol in ...
Prachi Khatri +2 more
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Probing Interstellar Turbulence in the Warm Ionized Medium using Emission Lines [PDF]
, 1999 Latex, 7 pages, 4 figures. To be published in the Proceedings of the 2nd Guillermo Haro Conference on Interstellar Turbulence held in Puebla ...
Tufte, S. L. +2 more
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Simulating the ISM and its Line Emission
, 2018 Integral field observations of galaxies now produce spatially resolved emission line diagnostic diagrams that can reveal the diverse processes impacting the ISM, and are necessarily dependent on the geometry and distribution of their gas clouds ...
Richardson, Mark +1 more
core +2 more sources
Simulations of High-redshift [O iii] Emitters: Chemical Evolution and Multiline Diagnostics
The Astrophysical Journal, 2023 Recent observations by the James Webb Space Telescope discovered a number of high-redshift galaxies with strong emission lines from doubly ionized oxygen.
Yurina Nakazato +2 more
doaj +1 more source