Cyanodiacetylene (HC/sub 5/N) in Sagittarius B2

Journal Article · Sun Jul 01 04:00:00 EDT 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157162· OSTI ID:5929317

Avery, L W; Oka, T; Broten, N W; MacLeod, J M

The J=2..-->..1 and 3..-->..2 rotational transitions of cyanodiacetylene have been observed in Sgr B2. Statistical equilibrium calculations have been carried out to construct a three-component model of the HC/sub 5/N cloud in Sgr B2 which is consistent with these observations, with our earlier observations of the J=1..-->..0.4..-->..3, and 8..-->..7 lines and with the data obtained by Guelin and Thaddeus for the J=31..-->..30 to J=37..-->..36 millimeter-wave transitions. The relative strength of the J=1..-->..0 line requires the presence of an extensive, low-density envelope around the Sgr B2 molecular cloud which serves as a weak 1..-->..0 line maser. This envelope is characterized by an H/sub 2/ density of 100 cm/sup -3/ and a kinetic temperature of about 20 K. The maximum column density of HC/sub 5/N in Sgr B2 is found to be 1.6 x 10/sup 14/ cm/sup -3/, equal to that of HC/sub 3/N.

• Research Organization: Herzberg Institute of Astrophysics, National Research Council of Canada, Ottawa
• OSTI ID: 5929317
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 231:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL COMPOSITION
CHEMISTRY
COSMOCHEMISTRY
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY SPECTRA
ENERGY-LEVEL DENSITY
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INTERSTELLAR SPACE
MICROWAVE RADIATION
NEBULAE
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PROPIOLONITRILE
RADIATIONS
ROTATIONAL STATES
SPACE
SPECTRA