- Shell Candidates from I-GALFA HI Survey
- Shell Candidates from I-GALFA HI Survey
- ㆍ 저자명
- Park. Geum-Sook,Koo. Bon-Chul
- ㆍ 간행물명
- 천문학회보
- ㆍ 권/호정보
- 2010년|35권 2호|pp.68-68 (1 pages)
- ㆍ 발행정보
- 한국천문학회
- ㆍ 파일정보
- 정기간행물|ENG| PDF텍스트
- ㆍ 주제분야
- 기타
Diffuse interstellar atomic hydrogen (HI) gases are easily shaped into shell-like features by energetic processes such as stellar winds and supernova explosions. The physical characteristics and the Galactic distribution of HI shells and shell-like structures, therefore, are closely related to those of the energy sources. Recently, Inner-Galaxy Arecibo L-band Feed Array (I-GALFA) low-latitude HI survey has been completed. I-GALFA HI survey covers the central part of the first quadrant ($31^{circ}{lesssim}1{lesssim}77^{circ}$ at b = $0^{circ}$, ${mid}b{mid}lesssim;12^{circ}$) with spatial and velocity resolutions of 3.35′and 0.184 km/s, respectively. The high-angular and high-velocity resolutions enable in-depth investigation of HI shells including the ones of smaller angular sizes. We have found 36 shell candidates with the naked eye. Their angular sizes are distributed from $sim0.4^{circ}$ to $sim12^{circ}$. About sixteen of them appear to be expanding. We examine associated features at other wavebands and discuss their origin.