21-cm observations of nonplanar H I associated with the Perseus spiral arm

Abstract

view Abstract Citations (2) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 21-cm observations of nonplanar H I associated with the Perseus spiral arm. Grayzeck, E. J. Abstract An intermediate-velocity cloud (-55 km sec-1) centered at 1 = 122 , b = -15 has been mapped at 21 cm to determine its extent and possible connection to gas in the plane. The observations were obtained using the NRAO 140-ft radio telescope and the 413-channel autocorrelation receiver. Grid points spaced every beamwidth (22 arcmin) were observed from 1 =1 l9. 5 to l27. 5 and from b = -10 to -22 and the data were organized into b - V and 1- V contour maps, smoothed to a velocity resolution of 1 km sec '. The extent of the gas is presented in the form of contour maps of the H i column density over the velocity range of -45 to -70 km sec '. This material appears to be a continuation of the H i seen in the plane at velocities between -40 and -60 km . Additional information on young OB stars located near 1 =1 22 , b = -15 particularly HD 4460, which has a distance of 2 kpc and V LSR = -55 km sec ' further substantiate the association of this intermediate-velocity gas with the Perseus spiral arm. Publication: The Astronomical Journal Pub Date: November 1977 DOI: 10.1086/112142 Bibcode: 1977AJ.....82..886G Keywords: Hydrogen Clouds; Interstellar Gas; Nebulae; Spiral Galaxies; Astronomical Maps; Centimeter Waves; Early Stars; Gas Density; Microwave Spectra; Astrophysics full text sources ADS | data products SIMBAD (34)