本星系群ic10星暴矮星系的恒星形成历史

Mahtab Gholami, A. Javadi, J. V. van Loon, H. Khosroshahi, E. Saremi
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摘要

IC 10是本星系群(LG)中的一个星暴矮星系,拥有大量新形成的恒星,与其他LG星系相比,这些恒星质量大,本质上非常明亮。利用艾萨克·牛顿望远镜(INT)和宽视场相机(WFC)在i波段和v波段进行了光学监测调查,以确定该恒星形成星系中最进化的渐近巨星分支星(AGBs)和红超巨星(RSGs),可用于确定恒星形成历史(SFH)。利用二维尘埃图(SFD98)测量每颗恒星的E(B - V)作为精确星等的有效因子,得到每颗恒星在i波段和V波段的总消光。我们获得了0.07 deg2 (13.5 kpc2)范围内53579颗恒星的光度表,其中762颗恒星在剔除前景恒星和饱和恒星后被归为可变候选恒星。为了重建IC 10的SFH,我们首先在距离星系中心两个半光半径(2r小时)的区域内确定了424个长周期变量(LPV)候选者。我们估计最近的恒星形成速率(SFR)为~ 0.32年-1,金属丰度恒定Z = 0.0008,表明该星系目前正在经历高水平的恒星形成。同样,对于金属丰度,在2r小时内可以得到恒星的总质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Star formation history for the starburst dwarf galaxy in the Local Group, IC 10
Abstract IC 10 as a starburst dwarf galaxy in the Local Group (LG) has a large population of newly formed stars that are massive and intrinsically very bright in comparison with other LG galaxies. Using the Isaac Newton Telescope (INT) with the Wide Field Camera (WFC) in the i-band and V-band, we performed an optical monitoring survey to identify the most evolved asymptotic giant branch stars (AGBs) and red supergiant stars (RSGs) in this star-forming galaxy, which can be used to determine the star formation history (SFH). The E(B - V) as an effective factor for obtaining the precise magnitude of stars is measured for each star using a 2D dust map (SFD98) to obtain a total extinction for each star in both the i-band and V-band. We obtained the photometric catalog for 53579 stars within the area of 0.07 deg2 (13.5 kpc2), of which 762 stars are classified as variable candidates after removing the foreground stars and saturated ones from our catalog. To reconstruct the SFH for IC 10, we first identified 424 long-period variable (LPV) candidates within the area of two half-light radii (2r h ) from the center of the galaxy. We estimated the recent star formation rate (SFR) at ∼ 0.32 yr-1 for a constant metallicity Z = 0.0008, showing the galaxy is currently undergoing high levels of star formation. Also, a total stellar mass of is obtained within 2r h for that metallicity.
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