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首页> 外文期刊>The Astrophysical journal >STAR FORMATION PROPERTIES IN THE LOCAL VOLUME GALAXIES VIA Hα AND FAR-ULTRAVIOLET FLUXES
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STAR FORMATION PROPERTIES IN THE LOCAL VOLUME GALAXIES VIA Hα AND FAR-ULTRAVIOLET FLUXES

机译:Hα和远超紫外通量的地方体积星系中的恒星形成特性

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A distance-limited sample of 869 objects from the Updated Nearby Galaxy Catalog is used to characterize the star formation status of the Local Volume population. We present a compiled list of 1217 star formation rate (SFR) estimates for 802 galaxies within 11 Mpc, derived from the Hα imaging surveys and the GALEX far-ultraviolet survey. We briefly discuss some basic scaling relations between SFR and luminosity, morphology, H I mass, surface brightness, and the environment of the galaxies. About 3/4 of our sample consist of dwarf galaxies, for which we offer a more refined classification. We note that the specific SFR of nearly all luminous and dwarf galaxies does not exceed the maximum value: log (SFR/LK ) = –9.4 [yr–1]. Most spiral and blue dwarf galaxies have enough time to generate their stellar mass during the cosmological time, T 0, with the observed SFRs. They dispose of a sufficient amount of gas to support their present SFRs over the next T 0 term. We note that only a small fraction of BCD, Im, and Ir galaxies (about 1/20) proceed in a mode of vigorous starburst activity. In general, the star formation history of spiral and blue dwarf galaxies is mainly driven by their internal processes. The present SFRs of E, S0, and dSph galaxies typically have 1/30-1/300 of their former activity.
机译:来自“更新的附近银河目录”的869个物体的距离有限的样本用于表征“本地体”人口的恒星形成状态。我们提供了一个11 Mpc内的802个星系的1217个恒星形成率(SFR)估计值的汇总列表,该估计值来自Hα成像调查和GALEX远紫外线调查。我们简要讨论了SFR与亮度,形态,H I质量,表面亮度和星系环境之间的一些基本比例关系。我们的样本中约3/4由矮星系组成,为此我们提供了更精细的分类。我们注意到几乎所有发光和矮星系的特定SFR都不会超过最大值:log(SFR / LK)= –9.4 [yr-1]。大多数螺旋星系和蓝矮星系在观测到的SFR的宇宙学时间T 0内有足够的时间产生恒星质量。他们处理了足够的气体以在下一个T 0期间支撑其当前的SFR。我们注意到,只有小部分的BCD,Im和Ir星系(约1/20)以强烈的星爆活动模式进行。一般而言,螺旋星系和蓝矮星系的恒星形成历史主要受其内部过程驱动。 E,S0和dSph星系的当前SFR通常具有其以前活动的1 / 30-1 / 300。

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