Kinematics of the interstellar medium in the Cyg I region

Details Kinematics of the interstellar medium in the Cyg I region Kinematics of the interstellar medium in the Cyg I region

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..450l&link_type=abstract

Astronomy Letters, Volume 23, Issue 4, July 1997, pp.450-457; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 515

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We present H interferometric observations of the northwestern part of the gas and dust complex associated with the Cyg OB1 and OB3 associations. The radial-velocity field of ionized hydrogen in the region l ~ 73.5-77 deg and b ~ 1.5-4 deg is studied. Most of the Hα-line profiles exhibit the main peak and weak features in the blue wings; in individual regions, a secondary peak with an intensity that reaches 15-30% of the intensity of the main component is observed. The mean radial velocity of the main component systematically decreases from V_LSR = 18-20 km s^-1 in the south of the region to V_LSR = 4-11 km s^-1 in the north. As in our previous studies, we associate the motion of ionized hydrogen at a radial velocity of 4-12 km s^-1, which is determined from the brightest component of the Hα profile, with the differential Galactic rotation. The radial velocities of the weak features in the Hα-line profile are distributed over the range -100 to -20 km s^-1. In the direction of the nebulae Simeiz 55, G75.6+3.2, and G74.5+2.2, the distribution of secondary peaks in the line profile makes it possible to reliably identify gas flows at mean velocities V_LSR ~ -55, -35, and -33 km s^-1, respectively. We use our decade-long studies of the kinematics of ionized gas in the multishell complex associated with Cyg OB1 and OB3 to compile an electronic database of radial velocities in the Hα line. By now we have obtained more than 1000 interference-filter images and measured the radial velocities at more than 9000 points.

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