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  • ASTROPHYSICS  (10)
  • 1980-1984  (10)
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  • 1
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    On OMC-1 temperatures determined from methyl cyanide observations (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: An analysis is performed on the J(k) = 12(k)-11(k) and 13(k)-12(k) transitions of methyl cyanide detected by other investigators in the direction of OMC-1. The original interpretation of those observations argues for the presence of two distinct temperature regions or possibly a temperature gradient within the cloud. The analysis presented here demonstrates that the observations of these particular molecular transitions are consistent with a single methyl cyanide emission region with a source kinetic temperature of 121.2 + or - 8.2 K and a molecular rotational temperature of 16.6 + or - 1.8 K.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 260
    Format: text
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  • 2
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    Millimeter-wave experiments for cometary space missions (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Predicted brightness temperatures, computed by means of radiative transfer techniques adapted from the modeling of terrestrial ice and snow fields, are given for cometary nucleus models consisting of homogeneous layers of water ice and refractory grain mixtures presented as functions of wavelength. The computed millimeter-wave spectra are sensitive to the values of such physically significant nucleus parameters as (1) crust thickness, (2) subsurface temperature gradient, and (3) sublimating surface boundary temperature. Although antenna beam dilution is a major obstacle for ground-based molecular spectral line radio observations of comets, a millimeter-wave radiometer in the vicinity of the comet would be immune to this effect and able to make observations of several candidate parent molecules in the gas phase.
    Schlagwort(e): ASTROPHYSICS
    Format: text
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  • 3
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    Methanol in Orion A - Simultaneous observations of corresponding rotational transitions in the ground and torsionally excited states (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 264
    Format: text
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  • 4
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    Detection of interstellar sodium hydroxide in self-absorption toward the galactic center (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: A weak self-absorbed emission line, which is identified as the J = 4-3 transition of sodium hydroxide, has been detected in the direction of Sgr B2(OH). The correspondingly weak Sgr B2(QH) emission line U75406, previously reported as an unidentified spectral feature by other investigators, is consistent with the J = 3-2 transition of sodium hydroxide. This detection may represent the first evidence of a grain reaction formation mechanism for simple metal hydroxides. The detection of H62 Delta toward Orion A is also reported.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 262
    Format: text
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  • 5
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    High spatial resolution VLA observations of the R Aquarii jet (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The Very Large Array was used to observe the jet feature of the symbiotic variable R Aquarii. A steady emission at 6 cm was confirmed for the past year, with the jet located 6.4 arcsec from R Aquarii at 29.3 deg PA. A velocity for the jet has been calculated as 40 km/sec, and may be accompanied by an ejection velocity in the range of 760-1800 km/sec. Since R Aquarii is the closest known object with a jet, further monitoring is recommended in order to detect any episodic mass transfer in what may be a binary system. The mass transfer, monitored at various wavelengths, would account for the observed optical and radio properties.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 267; April 15
    Format: text
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  • 6
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    A search for the lowest-energy conformer of interstellar glycine (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The first search for the lowest-energy conformation of interstellar glycine has been carried out. An emission line has been detected in Sgr B2 which is coincident in frequency with the J(K-K+) = 14(1, 14)-13(1, 13) transition of conformer I glycine; while the carrier of the observed line is uncertain, no other frequency-coincident species are known, and hence glycine cannot be ruled out. Several previously unidentified lines have been identified as methyl formate. Evidence for the existence of the elusive interstellar ethylene oxide, the only reported interstellar ring-structure molecule, is discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 241
    Format: text
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  • 7
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    Detection of the torsionally excited state of methanol in Orion A (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Torsionally excited methanol has been detected in Orion A, where three emission lines observed in the region of 93-100 GHz coincide with laboratory measurements of three methanol transitions. Torsionally excited methanol may therefore be used as a novel temperature probe, since this state lies near 200 per cm above the ground state, or about 290 K. No emission was detected from the transition arising from levels near 300 per cm, or approximately 430 K above the ground state.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 253
    Format: text
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  • 8
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    The kinetic temperature and CH3CCH column density profiles in SGR B2, Orion, and Dr 21 (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Kinetic temperatures, T(kin), are presently estimated by means of a technique employing the intensities of the adjacent rotational transitions of symmetric top molecules, under the assumptions that the metastable levels are thermalized, and that the excitation temperature connecting the upper level of the observed transition to the lowest level in the K ladder is the same for the both adjacent transitions. The method is applied to observations of the J = 5-4 and J = 6-5 transitions of CH3CCH obtained at 1-arcmin intervals along a NS-EW cross that centered on Orion KL, Sgr B2, and Dr 21. The technique's application to CH3CN lines from the central positions of Sgr B2 and Orion produces T(kin) values that are in good agreement with other determinations. The fact that these lines are broader than those of CH3CCH is interpreted in terms of a model in which CH3CN emission is confined to small and warm core region while CH3CCH emission is dominated by a more extensive, almost isothermal and cooler halo region in Orion KL and Sgr B2.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 272; Sept. 15
    Format: text
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  • 9
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    Comparison of C(+) distributions with new interstellar sources of HCO emission (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The present investigation is concerned with two new sources of HCO emission (Sgr B2 and DR 21). The column densities of HCO are low in all objects observed. The data are consistent with HCO being located near appreciable sources of ultraviolet excitation as predicted by dJDB models. The correlation of C(+) and HCO expected from these models is less certain. Although two examples of good correlation are found (NGC 2024 and DR 21), three other regions (Sgr B2, Orion A, and Rho Oph) were observed where either CRRL emission was present and not HCO emission or vice versa. It is possible that this could be a result of low sensitivity or incomplete sampling or source geometry.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 271; Aug. 1
    Format: text
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  • 10
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    A radio search for interstellar phosphorus compounds (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The J = 1-0 and 3-2 transitions of phosphorus nitride, PN, with resolvable hyperfine components at 46.99 GHz and blended components at 140.97 GHz, and transitions of phosphine, PH3, at 47.39 and 46.94 GHz, arising from a small induced dipole moment, have been searched for but not found in interstellar molecular clouds. The J = 3/2-1/2, F - 3/2-3/2 transition of nitric oxide, NO, and the J(K-K+) = 16(4, 12) -15(5, 11) transition of sulfur dioxide, SO2, have been detected in Orion and Sagittarius B2. An unidentified emission line, U140921.8 MHz, has been observed in IRC + 10216.
    Schlagwort(e): ASTROPHYSICS
    Materialart: PB81-157976 , Astrophysical Journal; vol. 241
    Format: text
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