Infrared Study of Mass Distribution in Extra Galactiv Halo

额外星系晕质量分布的红外研究

• 批准号: 08454050
• 负责人: MAIHARA Toshinori
• 金额: $ 4.16万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454050/
• 关键词: IR; Galaxies; Galactic Halo; Low Mass Star; Dark Matter; Galactic Structure

There have so far not been definite and consistent interpretations about the source of gravitational mass in a galaxy. the visible stellar mass is not sufficient to explain the so-called flat rotation velocity in the outskirt of galaxies. In this observational research, we attempt to measure the surface brightness distribution of halo region of an external galaxy to examine the contribution of faint low-mass stars in the halo.We have oabtained observational results in both the visible and near-infrared bands of faint emission of the extended halo in one of edge-on spiral galaxies called 'UGC7617', using our unique instrument called OHS mounted on the UH telescope on Mauna Kea, Hawaii. With this observations, we have found a diffuse emission component of a very red color in the halo region. Based on the spectral energy distribution as well as spatial distribution of the emission component, and also by constructing a model of the galaxy, we have inferred the representative types of low-mass stars detected and thus estimated the stellar contribution to the total mass of the halo.

到目前为止，关于星系中引力质量的来源还没有明确和一致的解释。可见的恒星质量不足以解释星系外围所谓的平坦旋转速度。在本观测研究中，我们试图测量一个外星系晕区的表面亮度分布，以考察晕区中微弱低质量恒星的贡献.我们在一个被称为'UGC 7617'的边缘旋涡星系中获得了扩展晕微弱发射的可见光和近红外波段的观测结果，使用我们独特的OHS仪器，安装在夏威夷莫纳克亚山的UH望远镜上。通过这些观测，我们在晕圈区域发现了一个非常红的漫发射成分。根据光谱能量分布和发射分量的空间分布，并通过建立星系模型，我们推断了所探测到的低质量恒星的代表类型，从而估算了恒星对晕总质量的贡献。

项目成果

F.Iwamuro et al: "Near Infrared Spectro photo metry of 4C40,36" Astrophysical Journal. 466. 67-70 (1996)

F.Iwamuro 等人：“4C40,36 的近红外光谱光度测量”天体物理学杂志。

F.Iwamuro 他: "Near-Infrared Spectrophotometry of 4C40,36" Astrophysical Journal, Letters. 466. L67-L70 (1996)

F. Iwamuro 等人：“4C40 的近红外分光光度法，36”《天体物理学杂志》，快报 466。L67-L70 (1996)

T.Maihara et al.: ""Observation of the Extended Halo Emission of UGC7617"" Astrophysical Journal. (submitted).

T.Maihara 等人：“UGC7617 扩展晕发射的观察”《天体物理学杂志》。

S.Oya 他: "Near-Infrared Spectroscopic Observation of the High-Z Quasar PKS 0201+113" Publ.Astron.Soc.Japan. 50. 163-168 (1998)

S.Oya 等人：“高 Z 类星体 PKS 0201+113 的近红外光谱观测”Publ.Astron.Soc.Japan 50. 163-168 (1998)。

M.Imanishi et al: "Spectroscopy of Mrk 831 ad NGC 4151 in the 3μm Region" Astrophysical Journal. (submitted).

M.Imanishi 等人：“3μm 区域中 Mrk 831 和 NGC 4151 的光谱”《天体物理学杂志》（已提交）。