High-resolution surveys of the Sagittarius A molecular cloud complex in ammonia, carbon monoxide, and isocyanic acid

1985 ◽  
Vol 57 ◽  
pp. 535 ◽  
Author(s):  
J. T. Armstrong ◽  
A. H. Barrett
Keyword(s):  
Carbon Monoxide ◽  
High Resolution ◽  
Molecular Cloud ◽  
Isocyanic Acid ◽  
Sagittarius A ◽  
Cloud Complex

scholarly journals The abundances of atomic carbon and carbon monoxide compared with visual extinction in the Ophiuchus molecular cloud complex

1989 ◽  
Vol 344 ◽  
pp. 311 ◽  
Author(s):  
Margaret A. Frerking ◽  
Jocelyn Keene ◽  
Geoffrey A. Blake ◽  
T. G. Phillips
Keyword(s):  
Carbon Monoxide ◽  
Molecular Cloud ◽  
Atomic Carbon ◽  
Visual Extinction ◽  
Cloud Complex

The Motions of Formaldehyde Clouds Near Sgr A

1974 ◽  
Vol 2 (5) ◽  
pp. 248-250 ◽  
Author(s):  
J. B. Whiteoak
Keyword(s):  
High Resolution ◽  
Radial Velocity ◽  
Molecular Cloud ◽  
Alternative Interpretation ◽  
Thermal Source ◽  
Local Standard ◽  
Sgr A ◽  
Cloud Complex ◽  
Resolution Study ◽  
Local Standard Of Rest

It is well known that a molecular cloud complex with a radial velocity of 40 km s–1 is located in front of and near Sgr A, the non-thermal source at the centre of our galaxy. The motion of this cloud is generally interpreted as a contraction towards the centre. In terms of the general kinematics of our galaxy the existence of contraction is not firmly established – the main spiral features are either stationary with respect to the local standard of rest or expanding outwards from the centre (e.g., the 4 kpc expanding arm). However, as a result of a high-resolution study of the H2CO absorption arising in the molecular cloud, an alternative interpretation not involving contraction is suggested.

scholarly journals Sagittarius A Molecular Cloud Complex in H13CO+and Thermal SiO Emission Lines

2011 ◽  
Vol 63 (4) ◽  
pp. 763-794 ◽  
Author(s):  
Masato Tsuboi ◽  
Ken-ichi Tadaki ◽  
Atsushi Miyazaki ◽  
Toshihiro Handa
Keyword(s):  
Molecular Cloud ◽  
Emission Lines ◽  
Sagittarius A ◽  
Cloud Complex

scholarly journals Erratum: Sagittarius A Molecular Cloud Complex in HCO and Thermal SiO Emission Lines: Fig. 8.

2012 ◽  
Vol 64 (3) ◽  
pp. 64 ◽  
Author(s):  
Masato Tsuboi ◽  
Ken-ichi Tadaki ◽  
Atsushi Miyazaki ◽  
Toshihiro Handa
Keyword(s):  
Molecular Cloud ◽  
Emission Lines ◽  
Sagittarius A ◽  
Cloud Complex

scholarly journals Carbon-chain molecules in molecular outflows and Lupus I region – new producing region and new forming mechanism

2019 ◽  
Vol 488 (1) ◽  
pp. 495-511
Author(s):  
Yuefang Wu ◽  
Xunchuan Liu ◽  
Xi Chen ◽  
Lianghao Lin ◽  
Jinghua Yuan ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Molecular Cloud ◽  
Carbon Chain ◽  
Species Range ◽  
Chain Molecules ◽  
Forming Mechanism ◽  
Molecular Outflows ◽  
Chemical Models ◽  
Cloud Complex

Abstract Using the new equipment of the Shanghai Tian Ma Radio Telescope, we have searched for carbon-chain molecules (CCMs) towards five outflow sources and six Lupus I starless dust cores, including one region known to be characterized by warm carbon-chain chemistry (WCCC), Lupus I-1 (IRAS 15398-3359), and one TMC-1 like cloud, Lupus I-6 (Lupus-1A). Lines of HC3N J = 2 − 1, HC5N J = 6 − 5, HC7N J = 14 − 13, 15 − 14, 16 − 15, and C3S J = 3 − 2 were detected in all the targets except in the outflow source L1660 and the starless dust core Lupus I-3/4. The column densities of nitrogen-bearing species range from 1012 to 1014 cm−2 and those of C3S are about 1012 cm−2. Two outflow sources, I20582+7724 and L1221, could be identified as new carbon-chain-producing regions. Four of the Lupus I dust cores are newly identified as early quiescent and dark carbon-chain-producing regions similar to Lup I-6, which together with the WCCC source, Lup I-1, indicate that carbon-chain-producing regions are popular in Lupus I which can be regard as a Taurus-like molecular cloud complex in our Galaxy. The column densities of C3S are larger than those of HC7N in the three outflow sources I20582, L1221, and L1251A. Shocked carbon-chain chemistry is proposed to explain the abnormal high abundances of C3S compared with those of nitrogen-bearing CCMs. Gas-grain chemical models support the idea that shocks can fuel the environment of those sources with enough S+ thus driving the generation of S-bearing CCMs.

Electron impact studies. VI. Mass spectra of esters and thioesters. Skeletal rearrangement on electron impact

1967 ◽  
Vol 20 (4) ◽  
pp. 689 ◽  
Author(s):  
JH Bowie ◽  
RG Cooks ◽  
P Jakobsen ◽  
S Lawesson ◽  
G Schroll
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
High Resolution ◽  
Electron Impact ◽  
Mass Spectra ◽  
Skeletal Rearrangement ◽  
Unsaturated Esters ◽  
Impact Studies ◽  
Unsaturated Alcohols ◽  
Metastable Ions

The mass spectra of representative series of simple alkyl acetoacetates, alkyl acetothioacetates, and some unsaturated esters derived from unsaturated alcohols or phenols are reported and discussed. The fragmentation schemes have been established by high resolution measurements, appropriate metastable ions, and by deuterium and 18O labelling. Many of the spectra show significant skeletal rearrangement fragments arising from either loss of carbon monoxide or carbon dioxide.

HIGH-RESOLUTION OSCILLATOR STRENGTH MEASUREMENTS OF THEv′ = 0,1 BANDS OF THEB-X,C-X, ANDE-XSYSTEMS IN FIVE ISOTOPOLOGUES OF CARBON MONOXIDE

2014 ◽  
Vol 788 (1) ◽  
pp. 67 ◽  
Author(s):  
G. Stark ◽  
A. N. Heays ◽  
J. R. Lyons ◽  
P. L. Smith ◽  
M. Eidelsberg ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
High Resolution ◽  
Oscillator Strength
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