Abstract

Physical characteristics of a large sample of compact galaxies with active star formation from the SDSS DR14 are derived. The sample includes approximately 30 000 compact isolated galaxies with angular diameters <6″. The emission lines H_β with equivalent widths EW(H_β) ≥ 1 nm are observed in the spectra of selected galaxies. The stellar masses of compact galaxies are distributed in a wide range from 10⁵M_⊙ to 10¹¹M_⊙ with a maximum at ~10⁹M_⊙. The oxygen abundances for the bulk of compact galaxies are distributed in the range 7.8…8.2 with a maximum at ~8.05. Compact galaxies are characterized with high specific star-formation rates of 10…100 Gyr^–1. The SDSS spectroscopic data were supplemented by photometric data in the far- and near-ultraviolet ranges from the GALEX and in the mid-infrared range at 22 μm from the WISE all-sky surveys. The star-formation rate, concisely named “composite” one, was determined using combinations of two out of five observed luminosities: luminosity L(H_α) in the emission line H_α, monochromatic luminosities in the ultraviolet continuum L(FUV), and L(NUV) and in the mid-infrared continuum L(22 μm) as well as the total luminosities in the infrared range L(TIR). “Composite” star formation rates in compact galaxies with active star formation are compared with those determined from the extinction- and spectral aperture-corrected luminosities of galaxies in the hydrogen emission line H_β. Relations for “composite” star formation rates with different combinations of indicators were obtained, which are mutually consistent and correspond to star-formation rates SFR(H_β) derived from the luminosities of galaxies in the hydrogen emission line H_β, corrected for extinction and spectral aperture.

中文翻译：

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SDSS DR14形成具有活跃恒星的紧凑星系：从不同波长范围内的光度组合得出的恒星形成率

摘要

从SDSS DR14推导了具有活跃恒星形成的紧凑型星系大样本的物理特征。样本包括约3万个角直径<6英寸的紧凑的孤立星系。发射线H _β与等值宽度EW（H _β）≥1在选择星系的光谱中观察到的纳米。紧凑星系的恒星质量被分布在宽范围从10 ⁵中号_⊙至10 ¹¹中号_⊙在约10个具有最大⁹中号_⊙。大部分紧凑星系的氧丰度分布在7.8…8.2范围内，最大值在〜8.05。紧凑型星系的特征是高比恒星形成率为10…100 Gyr ^–1。SDSS光谱数据由来自GALEX的远紫外和近紫外范围以及WISE全天候测量的22μm的中红外范围的光度数据补充。星形形成率，简明地称为“复合”之一，采用五分之二的观察到的光度的组合被确定：光度大号（H _α）在发射线H _α，在紫外线连续单色光度大号（FUV），和L（NUV）和中红外连续谱L（22μm）以及红外范围L（TIR）中的总光度。在用活性恒星形成紧凑星系“复合”恒星形成速率与从氢发射线H星系的extinction-和光谱孔径校正的光度测定相比_β。获得用于与指标不同组合的“复合”星形成率的关系，它们是相互一致的，并且对应于恒星形成率SFR（H _β）从氢发射线H星系的光度衍生_β，对于消光校正和光谱孔径。