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The HII regions of the damped Ly alpha absorber SBS 1543+593

机译:阻尼Ly吸收剂SBS的HII区域1543 + 593

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We report new imaging and spectroscopic observations of the damped Lyalpha absorber (DLA) galaxy SBS 1543+593, a nearby dwarf galaxy whose stellar disk is intersected by the sight line to the bright background QSO HS 1543+5921. Hubble Space Telescope imaging observations with WFPC2 in the F450W and F702W bands are used to measure the DLA galaxy's properties and compile a catalog of its ( candidate) H II regions. Ground-based long-slit spectroscopy of the brightest H II region in the galaxy yields estimates of the star formation rate (SFR) and chemical abundances in the galaxy's interstellar medium. We find that SBS 1543+593 exhibits an SFR of approximate to 0.006 h(70)(-2) M-. yr(-1), or an SFR per unit area of approximate to 1.4 x 10(-4) h(70)(-2) M-. yr(-1) kpc(-2). We derive gas-phase abundances in the ionized gas of 12 + log (O/H) = 8.2 +/- 0.2, which is about 1/3 of the solar value, and log(N/O) = -1.40(-0.3)(+0.2) . These values are consistent with the morphological appearance of SBS 1543+ 593, an Sm dwarf of M-B - 5 log h(70) = - 16.8 +/- 0.2 and intermediate surface brightness. SBS 1543+ 593 is the first bona fide DLA for which abundances have been measured using emission- line diagnostics. When compared with future high-resolution ultraviolet spectroscopy, our results should prove key for interpreting abundance determinations in high-redshift DLAs. [References: 62]
机译:我们报告了阻尼的Lyalpha吸收器(DLA)星系SBS 1543 + 593(附近的矮星系,其星盘与视线相交到明亮的背景QSO HS 1543 + 5921)的新成像和光谱学观察结果。使用F450W和F702W波段中的WFPC2进行的哈勃太空望远镜成像观测用于测量DLA星系的属性并编制其(候选)H II区的目录。银河系中最亮的H II区域的地面长缝光谱法可估算出星系星际介质中的恒星形成率(SFR)和化学丰度。我们发现SBS 1543 + 593展品的SFR约为0.006 h(70)(-2)M-。 yr(-1),或每单位面积的SFR约为1.4 x 10(-4)h(70)(-2)M-。 yr(-1)kpc(-2)。我们得出离子化气体中的气相丰度为12 + log(O / H)= 8.2 +/- 0.2,大约是太阳值的1/3,log(N / O)= -1.40(-0.3 )(+ 0.2)。这些值与SBS 1543+ 593的形态学外观,M-B的Sm矮度-5 log h(70)=-16.8 +/- 0.2和中间表面亮度相一致。 SBS 1543+ 593是第一个真正的DLA,已使用发射线诊断程序测量了其丰度。当与未来的高分辨率紫外光谱法进行比较时,我们的结果应证明是解释高红移DLA中丰度测定的关键。 [参考:62]

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