Kinematics of the interstellar medium in the Cyg I regionстатья
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Дата последнего поиска статьи во внешних источниках: 8 февраля 2017 г.
Аннотация:We present H alpha 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 similar to 73.5 degrees-77 degrees and b similar to 1.5 degrees-4 degrees is studied. Most of the H alpha-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 Ha profile, with the differential Galactic rotation. The radial velocities of the weak features in the H alpha-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 similar to -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 H alpha line. By now we have obtained more than 1000 interference-filter images and measured the radial velocities at more than 9000 points.