|
|||||
|
|
Spatial distribution and luminosity function of OH/IR maser sources |
|
| Authors: | Tong Yi Sun Jin Xie Shu-ding Yang Xin-xing |
| Institution: | aDepartment of Asronomy, Beijing Normal University China bBeijing Observatory, Academia Sinica China |
| Abstract: | In this paper, we study the galactic distribution and luminosity function of OH/IR maser sources. All the selected OH/IR sources have optical or infrared identification. Most of them are associated with late-type (>M5) Mira variables. Their derived density distribution shows a steep peak at a galactocentric distance of r0 -7.5 kpc and decreases rapidly at smaller and larger R0. The FWHM of the distribution curve is 2.1 kpc. This is similar to the galactic distribution of Mira variables investigated by Glass et al.We also derive the luminosity function of the identified OH/IR maser sources from their distances, their detection probabilities, and their corrected OH radio peak flux densities. The luminosity function ρ(L) varies as LOH?1.79. This is similar to that of unidentified maser sources. The range of luminosity of identified OH/IR sources is approximately from 0.16 Jy · kpc2 to 1000 Jy · kpc2. It is quite different from that of unidentified OH sources. Finally, we discuss some differences and relations between identified and unidentified OH/IR maser sources. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |