(C II) 158 micron and (O I) 63 micron observations of the Galactic center regions

Details (C II) 158 micron and (O I) 63 micron observations of the Galactic center regions (C II) 158 micron and (O I) 63 micron observations of the Galactic center regions

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...91..613m&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 91, no. 2, p. 613-624

Astronomy and Astrophysics

Astronomy

15

Carbon, Fine Structure, Galactic Bulge, Infrared Astronomy, Line Spectra, Luminous Intensity, Milky Way Galaxy, Molecular Spectra, Oxygen, Velocity Distribution, Balloon-Borne Instruments, Dynamic Models, Fabry-Perot Spectrometers, Infrared Telescopes, Molecular Clouds, Photodissociation, Sagittarius Constellation, Ultraviolet Radiation

Scientific paper

Using the balloon-borne infrared telescope (BIRT) incorporated with a liquid-helium-cooled double-channel Fabry-Perot spectrometer, intensities and velocity profiles of (C II) 158 micrometers fine-structure lines have been observed in the Galactic center region within absolute value of l less than or equal to 0.7 deg. Intense (C II) line emission has been detected ubiquitously in almost all of the observed points. The distribution of the (C II) intensity shows a central peak at Sgr A West together with two prominent peaks at delta 1 = +/- 0.6 deg, which correspond to Sgr B1 (not Sgr B2) and Sgr C, respectively. The intensity distribution resembles but is not identical to, that of far-infrared emission. The velocity profiles of the (C II) line are resolved and can be deconvolved into multiple components, many of which can be traced to the features observed by molecular lines. The (O I) 63 micrometers line has been detected at Sgr A West and at some other points. The (O I) 63 micrometers/(C II) 158 micrometers ratios are always less than 3 in the beam of 3.7 min. These observed results can be explained as the emission generated in photodissociation regions formed in the molecular clouds complexes illuminated by intense ultraviolet (UV) radiation field in the Galactic center regions. However, contribution from ELD region is possibly present and cannot be ruled out.

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