Global photometric analysis of Galactic HII regions

作     者：Anastasiia Topchieva Dmitri Wiebe Maria S.Kirsanova 

作者机构：Institute of AstronomyRussian Academy of SciencesMoscow 119017Russia Ural Federal University19 Mira Str.EkaterinburgRussia 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2018年第18卷第8期

页      面：21-28页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by Program 7 of the Presidium of the RAS,“Transitional and Explosive Processes in Astrophysics,” the RFBR(Grant 17-02-00521) 

主　　题：ISM bubbles - (ISM) HII regions - ISM lines and bands 

摘      要：Total infrared fluxes are estimated for 99 HII regions around massive stars. The following wavebands have been used for the analysis： 8 and 24 μm, based on data from the Spitzer Space Telescope （IRAC and MIPS, respectively）; 70, 160, 250, 350 and 500 μm, based on data from the Herschel Space Observatory （PACS and SPIRE）. The estimated fluxes are used to evaluate the polycyclic aromatic hy- drocarbon （PAH） mass fraction （qPAH） and the intensity of ultraviolet emission in the studied objects. It is shown that the PAH mass fraction, qPAH, is much lower in these objects than the average Galactic value, implying effective destruction of aromatic particles in HII regions. Estimated radiation field inten- sities （U） are close to those derived for extragalactic HII complexes. Color indices [F24/F8], [F70/F24], [F160/F24] and [F160/F70] are compared to criteria proposed to distinguish between regions of ionized hydrogen and planetary nebulae. Also, we relate our results to analogous color indices for extragalactic complexes of ionized hydrogen.