Observation of the halo of the edge-on galaxy IC 5249

被引：40

作者：

Abe, F

Bond, IA

Carter, BS

Dodd, RJ

Fujimoto, M

Hearnshaw, JB

Honda, M

Jugaku, J

Kabe, S

Kilmartin, PM

Koribalski, BS

Kobayashi, M

Masuda, K

Matsubara, Y

Miyamoto, M

Muraki, Y

Nakamura, T

Nankivell, GR

Noda, S

Pennycook, GS

Pipe, LZ

Rattenbury, NJ

Reid, M

Rumsey, NJ

Saito, T

Sato, H

Sato, S

Sekiguchi, M

Sullivan, DJ

Sumi, T

Watase, Y

Yanagisawa, T

Yock, PCM

Yoshizawa, M

机构：

[1] Univ Auckland, Fac Sci, Auckland 1, New Zealand

[2] Nagoya Univ, Solar Terr Environm Lab, Chikusa Ku, Nagoya, Aichi 4648601, Japan

[3] Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand

[4] Carter Natl Observ, Wellington, New Zealand

[5] Nagoya Univ, Dept Phys, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[6] Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 1888502, Japan

[7] Res Inst Civilizat, Tama 2060013, Japan

[8] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[9] CSIRO, Australia Telescope Natl Facil, Epping, NSW 2121, Australia

[10] Natl Astron Observ, Mitaka, Tokyo 1818588, Japan

[11] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068224, Japan

[12] Victoria Univ Wellington, Dept Phys, Wellington, New Zealand

[13] Tokyo Metropolitan Coll Aeronaut, Arakawa Ku, Tokyo 1160003, Japan

来源：

ASTRONOMICAL JOURNAL | 1999年 / 118卷 / 01期

关键词：

dark matter; galaxies : halos; galaxies : individual (IC 5249); galaxies : photometry; galaxies : structure; ISM : HI;

D O I：

10.1086/300907

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Optical photometry and H I synthesis observations of the southern edge-on Sc/Sd galaxy IC 5249 are reported. The rotation curve rises linearly out to a radius of 7 kpc and then appears to flatten out at similar to 100 km s(-1). The H I mass out to 24.5 kpc is similar to 6 x 10(9) M-., or 10% of the total mass out to this radius. The color, central surface brightness, scale height, and scale length of the disk of IC 5249 are R - I approximate to 0.4, mu = 20.6 +/- 0.1 R-C mag arcsec(-2), 600 +/- 40 pc, and 11 +/- 2 kpc, respectively. Additional light to that predicted by an exponential disk is present at distances greater than 3 kpc from the disk. At 5 kpc the surface brightness is 27-28 R-C mag arcsec(-2). The measured distribution of surface brightness is used to constrain the abundance of low-mass main-sequence stars in the halo of the galaxy. A halo made up entirely of main-sequence stars heavier than 0.13 M-. is excluded. We also find that less than 20% of the halo can be composed of main-sequence stars heavier than 0.30 M-.. Further observations are required to determine the rotation curve of IC 5249 to large radii and to determine precisely the abundance of low-mass main-sequence stars in the halo of the galaxy.

引用

页码：261 / 272

页数：12