منابع مشابه
Comparative Chemistry of Diffuse Clouds IV: CH
We observed the 3335 MHz (λ 9cm) F=1-1 line of CH toward a sample of diffuse clouds occulting compact extragalactic mm-wave continuum sources, using the old NRAO 43m telescope. Because radiofrequency observations of CH really must be calibrated with reference to a known CH abundance, we begin by deriving the relationships between CH, E B−V , H 2 and other hydrides found by optical spectroscopy.
متن کاملComparative Chemistry of Diffuse Clouds III: Sulfur-bearing Molecules
Using the Plateau de Bure Interferometer and IRAM 30m Telescope, we observed λ2-3mm absorption lines of CS, SO, SO2, H2S and HCS + from some of the diffuse clouds which occult our well-studied sample of compact extragalactic mm-wave continuum sources. Our observations of SO, H2S and HCS + represent the first detections of these species in diffuse clouds; SO2 was not detected at all. We find a t...
متن کاملComparative chemistry of diffuse clouds V. Ammonia and formaldehyde
Using the VLA and NRAO 140′ telescopes we observed the λ1.3 cm (1, 1) and (2, 2) lines of NH3 in absorption and emission toward the compact extragalactic continuum sources NRAO150 (B0355+508) and 3C 111 (B0415+379). These sources are occulted by some seven local diffuse and translucent clouds showing molecular absorption in OH, CO, HCO and C2H: for the four features having NH3 absorption, we fi...
متن کاملPolar stratospheric clouds and upper-tropospheric clouds
Introduction Conclusions References
متن کاملComparative Analysis of Molecular Clouds in M31, M33, and the Milky Way
We present BIMA observations of a 20 field in the northeastern spiral arm of M31. In this region we find six giant molecular clouds (GMCs) that have a mean diameter of 57 13 pc, a mean velocity width of 6:5 1:2 km s , and a mean molecular mass of 3:0 1:6 ð Þ ; 10 M . The peak brightness temperature of these clouds ranges from 1.6 to 4.2 K. We compare these clouds to clouds in M33 observed by Wi...
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ژورنال
عنوان ژورنال: Revista Tecnología en Marcha
سال: 2020
ISSN: 2215-3241,0379-3982
DOI: 10.18845/tm.v33i7.5490