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  • 1
    Electronic Resource
    Electronic Resource
    The masers of E-type methanol in orion KL and SGR B2 (1987)
    Springer
    Astrophysics and space science 132 (1987), S. 263-268 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a simplified model the statistical equilibrium and radiative transfer equations of E-type-CH3OH are solved for Orion KL and SgrB2. According to our calculation results and the observation data taken by Matsakiset al. (1980) and Morimotoet al. (1985a, b), the physical conditions of both sources are estimated. In theJ 2-J 1 E methanol maser region of Orion KL, the density, kinetic temperature, dust temperature, and the fractional abundance are 0.8–2×106 cm−3, ≲150, 30–90 K, 0.8–8×10−6. In the 4−1-30 E and 5−1-40 E methanol maser region of Sgr B2 the correspondance physical conditions above are 104 cm3, 45, 23 K, and 7×10−7, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641758
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  • 2
    Electronic Resource
    Electronic Resource
    The hyperfine structures of HCNJ=1−0 and the implied physical informations: I. S140 (1991)
    Springer
    Astrophysics and space science 180 (1991), S. 151-155 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structures of HCNJ=1−0 are observed toward S140 with a high-resolution spectroscope. The measured ratiosR 02=T a * (F=0−1)/T a * (F=2−1) andR 12=T a * (F=1−1)/T a * (F=2−1) are 0.29±0.03 and 0.43±0.03 separately. A large velocity gradient model, the escape probability method and spherical approximation are adopted to calculate the radiative transfer. The correlations between the ratios of the hyperfine satellites and density (or optical depth) have been studied. To fit the measured ratios, a density of (0.9±0.1)×106 cm−4 is obtained toward S140 center. According to the differences between the calculated excitation temperatures of the hyperfine satellites, one finds that the so-called hyperfine anomalies is caused by the unrealistic LTE assumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644236
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    Paper (German National Licenses)
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