NEAR-INFRARED IMAGING OF SIX METAL-RICH QUASAR ABSORBER GALAXY FIELDS
NEAR-INFRARED IMAGING OF SIX METAL-RICH QUASAR ABSORBER GALAXY FIELDS
复制标题
六个富含金属类星体吸收星系场的近红外成像
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
D. York
中科院分区：
文献类型：
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作者：
L. Straka;V. Kulkarni;D. York
类星体光谱中的吸收线使我们能够定位和研究居间星系。为了获得这些吸收星系的更清晰的图像，我们利用Apache Point天文台的近红外照相机Fabry-Perot系统，在一个或多个滤波器（J和Ks）中获得了6个含有富金属低z阻尼或亚阻尼Lyα系统的类星体场的近红外宽带图像。这些数据使我们能够搜索星系并限制它们的光度。在J带和Ks带的6个视场中，有3个视场在2.″01-7.″38的距离上探测到了候选吸收体星系，其亮度在J带（E-Sc型星系）为log（L/L）= 10.44-10.36，在Ks带为log（L/L）= 11.59-10.03。我们对剩余的字段设置限制，对于J带没有检测到log（L/L返）<10.83-9.75，对于Ks带没有检测到log（L/L返）<10.43-10.05。我们还能够利用斯隆数字巡天光谱的每个领域来计算光通量和限制，以及限制星星形成率通过[O ii]λ3727发射光谱。我们的数据，结合其他最近的成像结果，富含金属的吸收体，建议吸收体金属丰度和星系光度之间可能存在正相关关系，虽然样本仍然很小。
Absorption lines in quasar spectra allow us to locate and study intervening galaxies. In order to obtain a clearer picture of these absorber galaxies, we have used the Near-Infrared Camera Fabry-Perot System at Apache Point Observatory to obtain near-infrared broadband images in one or more filters (J and Ks) of six quasar fields containing metal-rich low-z damped or sub-damped Lyα systems. These data allow us to search for the galaxies and constrain their luminosities. Candidate absorber galaxies are detected at 2.″01–7.″38 separation from the quasar in three out of six fields in the J and Ks bands at >3σ level with luminosities ranging from log(L/L☉) = 10.44–10.36 in the J band (for E-Sc type galaxies) and log(L/L☉) = 11.59–10.03 in the Ks band for our detections. We place limits on the remaining fields with no detections of log(L/L☉) <10.83–9.75 for the J band and log(L/L☉) <10.43–10.05 for the Ks band. We are also able to utilize Sloan Digital Sky Survey spectra for each field to calculate optical fluxes and limits as well as limits on star formation rate via [O ii]λ3727 emission in spectra. Our data, combined with other recent imaging results for metal-rich absorbers, suggest a possible positive correlation between absorber metallicity and galaxy luminosity, although the samples are still small.