Structure and kinematics of the interstellar medium in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456)статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The structure and kinematics of ionized supershells in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456) are analyzed using observations with the SCORPIO focal reducer on the 6-m Special Astrophysical Observatory telescope in three modes: direct imaging (in the H alpha, [O III], and [S II] lines), long-slit spectroscopy, and spectroscopy with a scanning Fabry - Perot interferometer. In addition to the previously known bright H II regions and the faint giant ring that surrounds the entire star-forming region, many new faint diffuse and arc structures have been detected. A. ne structure of the giant ring has been revealed. We do not confirm the previously detected expansion of the bright shells around young stellar associations with a velocity of 50 - 70 km/s). We have estimated their expansion velocities to be no higher than 15 - 20 km/s; the corresponding kinematic age, no younger than 3 - 4 Myr, agrees well with the age of the compact OB associations associated with them. We correlate the faint extended. lamentary and diffuse regions of ionized gas identified almost in the entire central region of the galaxy and the giant H II ring with the older (10 Myr) stellar population of the most recent starburst. Weak high-velocity [O III] and H alpha line wings ( up to 300 km/s from the line center) have been detected in the brightest H II region. Such velocities have been observed in the galaxy for the first time. The previously published Ha luminosity measurements for the galaxy are refined.