H-I STUDIES OF THE SCULPTOR GROUP GALAXIES .4. NGC-247

被引:73
作者
CARIGNAN, C
PUCHE, D
机构
[1] UNIV MONTREAL,OBSERV MT MEGANT,MONTREAL H3C 3J7,QUEBEC,CANADA
[2] NATL RADIO ASTRON OBSERV,VERY LARGE ARRAY,SOCORRO,NM 87801
关键词
D O I
10.1086/115547
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A study of the H I properties and mass distribution of the Sculptor group galaxy NGC 247, from VLA* observations, is presented. The H I disk turns out to be fairly small with a diameter comparable to the optical. The total H I mass is 8.0×108 script M sign⊙. From the velocity field, a systemic velocity Vsys = 161 km s-1, an inclination i = 74°, and a position angle P.A. = 170° are found. The derived rotation curve is not flat, but rising out to the last observed point. Differences of ≃20 km s-1 are seen between both sides (approaching and receding) of the galaxy. A study of the mass distribution suggests a (script M sign/LB)* = 4.0 for the stellar disk. For the dark halo, the best-fit model gives rc = 24.2 kpc and ρ0, = 0.0046 script M sign⊙ pc-3. While the (script M sign/MB)* is well defined, the halo parameters are not well constrained. At the last point of rotation curve, (script M sign/LB)global ≃ 11.
引用
收藏
页码:641 / &
相关论文
共 15 条
[11]  
DEVAUCOULEURS G, 1976, 2ND REFERENCE CATALO
[12]   THE VERY LARGE ARRAY - DESIGN AND PERFORMANCE OF A MODERN SYNTHESIS RADIO TELESCOPE [J].
NAPIER, PJ ;
THOMPSON, AR ;
EKERS, RD .
PROCEEDINGS OF THE IEEE, 1983, 71 (11) :1295-1320
[13]   H-I STUDIES OF THE SCULPTOR GROUP GALAXIES .1. MEMBERSHIP AND M/L OF THE GROUP [J].
PUCHE, D ;
CARIGNAN, C .
ASTRONOMICAL JOURNAL, 1988, 95 (04) :1025-1030
[14]   DISTRIBUTION OF DARK MATTER IN THE SPIRAL GALAXY NGC-3198 [J].
VANALBADA, TS ;
BAHCALL, JN ;
BEGEMAN, K ;
SANSCISI, R .
ASTROPHYSICAL JOURNAL, 1985, 295 (02) :305-&
[15]   OBSERVATIONS OF NEUTRAL HYDROGEN IN BRIGHT SOUTHERN GALAXIES [J].
WHITEOAK, JB ;
GARDNER, FF .
AUSTRALIAN JOURNAL OF PHYSICS, 1977, 30 (02) :187-207