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- W2151058840 abstract "We surveyed 81 dense molecular cores associated with regions of massive star formation and Sgr A in the JK 1K1 =5 05 404 and 10010 909 lines of HNCO. Line emission was detected towards 57 objects. Selected subsam- ples were also observed in the 101 000, 404 303, 707 606, 15015 14014, 16016 15015 and 21021 20020 lines, cover- ing a frequency range from 22 to 461 GHz. HNCO lines from the K 1 =2 ;3 ladders were detected in several sources. To- wards Orion-KL, K 1 =5 transitions with upper state energies Eu=k 1100 and 1300 K could be observed. Five HNCO cores were mapped. The sources remain spa- tially unresolved at 220 and 461 GHz (10010 909 and 21010 20020 transitions) with beam sizes of 24 00 and 18 00 , respectively. The detection of hyperfine structure in the 101 000 transi- tion is consistent with optically thin emission under conditions of Local Thermodynamic Equilibrium (LTE). This is corrobo- rated by a rotational diagram analysis of Orion-KL that indi- cates optically thin line emission also for transitions between higher excited states. At the same time a tentative detection of interstellar HN 13 CO (the 100;10 90;9 line at 220 GHz toward G 310.12-0.20) suggests optically thick emission from some rotational transitions. Typical HNCO abundances relative to H2 as derived from a population diagram analysis are 10 9 . The rotational tem- peratures reach 500 K. The gas densities in regions of HNCO K 1 =0 emission should be n > 10 6 cm 3 and in regions of K 1 > 0 emission about an order of magnitude higher even for radiative excitation. HNCO abundances are found to be enhanced in high- velocity gas. HNCO integrated line intensities correlate well with those of thermal SiO emission. This indicates a spatial" @default.
- W2151058840 created "2016-06-24" @default.
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- W2151058840 date "2000-09-01" @default.
- W2151058840 modified "2023-09-24" @default.
- W2151058840 title "HNCO in massive galactic dense cores" @default.
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