Galactic structure around longitude L = 317 deg determined from CIGALE observations

Details Galactic structure around longitude L = 317 deg determined from CIGALE observations Galactic structure around longitude L = 317 deg determined from CIGALE observations

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..257g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 257-269.

Astronomy and Astrophysics

Astrophysics

13

Galactic Structure, Interstellar Matter, Milky Way Galaxy, Fabry-Perot Interferometers, H Alpha Line, H Ii Regions, Photographic Plates, Radial Velocity, Radio Emission

Scientific paper

The spiral structure of the Galaxy is analyzed using the Cigale instrument, which consists of a scanning Perot-Fabry interferometer and a two-dimensional photon counting system. The instrument was utilized to detect galactic H-alpha emission for the H II region G 317.0 + 0.3 and foreground nebula emission. A correlation between the Cigale observation and spiral tracers between longitude (l) 312-324 deg is detected. The radial velocity for G 317.0 + 0.3 is calculated as -51 km/sec and for the foreground emission at l equals 317 deg as -4 km/sec. It is concluded that the diffuse H-alpha emission at l equals 317 deg is part of an inhomogeneous, diffuse H II region lying at 1 kpc in the nearest part of Sagittarius-Carina arm; the radio source G 317.0 + 0.3 is an H II region that is part of a large complex with radial velocities of -50 km/sec and is located in the Scutum-Crux arm at 4 kpc; and the G 316.8 - 0.0 is located in the same arm and has radial velocities of about -40 km/sec.

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