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首页> 外文期刊>The Astrophysical journal >A GALACTIC WEIGH-IN: MASS MODELS OF SINGS GALAXIES USING CHEMO-SPECTROPHOTOMETRIC GALACTIC EVOLUTION MODELS
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A GALACTIC WEIGH-IN: MASS MODELS OF SINGS GALAXIES USING CHEMO-SPECTROPHOTOMETRIC GALACTIC EVOLUTION MODELS

机译:银河系重量:使用化学分光光度法银河系演化模型的单星系质量模型

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The baryonic mass-to-light ratio () used to perform the photometry-to-mass conversion has a tremendous influence on the measurement of the baryonic content and distribution as well as on the determination of the dark halo parameters. Since numerous clues hint at an inside-out formation process for galaxies, a radius-dependant is needed to physically represent the radially varying stellar population. In this article, we use chemo-spectrophotometric galactic evolution (CSPE) models to determine for a wide range of masses and sizes in the scenario of an inside-out formation process by gas accretion. We apply our method to a SINGS subsample of 10 spiral and dwarf galaxies with photometric coverage ranging from the UV to the mid-IR. The CSPE models prove to be a good tool for weighting the different photometric bands in order to obtain consistent stellar disk masses regardless of the spectral band used. On the other hand, we show that the color index versus relation is an imperfect tool for assigning masses to young stellar populations because of the degeneracy affecting in all bands at low color index. The disks resulting from our analysis are compatible with the maximum disk hypothesis provided that an adequate bulge/disk decomposition is performed and that the correction for the presence of a bar is not neglected since bars disturb the internal disk kinematics. Disk-mass models including as a free parameter as well as models using our physically motivated, radially varying are presented and discussed for each galaxy.
机译:用于执行光度质量转换的重质子质量对光的比率()对重质子含量和分布的测量以及暗晕参数的确定都有很大的影响。由于大量线索暗示着星系的由内而外的形成过程,因此需要半径依赖来物理表示径向变化的恒星种群。在本文中,我们使用化学分光光度星系演化(CSPE)模型来确定在由气体积聚而由内而外形成过程的情况下,各种质量和尺寸。我们将我们的方法应用于10个螺旋星系和矮星系的SINGS子样本,其光度覆盖范围从UV到中红外。 CSPE模型被证明是加权不同测光带以获取一致的恒星盘质量的好工具,而与所使用的光谱带无关。另一方面,由于在低色指数下所有波段的简并性影响,因此我们表明,色指数与关系不是一种将质量分配给年轻恒星种群的不完善工具。我们的分析得出的圆盘与最大圆盘假设兼容,前提是执行了充分的凸出/圆盘分解,并且由于圆棒干扰了内部圆盘运动,因此对圆棒的存在的校正也不能忽略。针对每个星系,介绍并讨论了包括作为自由参数的盘质量模型以及使用我们的物理激励,径向变化的模型。

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