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Ly alpha emitters at z=5.7 in the Subaru deep field

机译：斯巴鲁深场中z = 5.7的Ly alpha发射器

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摘要

We present the properties of Ly alpha emitters (LAEs) at z = 5.7 in the Subaru Deep Field. A photometric sample of 89 LAE candidates was constructed from narrow-band data down to NB816 = 26.0 (AB) in a continuous 725 arcmin(2) area. Spectra of 39 objects satisfying the photometric selection criteria for LAEs were obtained with Subaru and Keck 11 Telescopes, among which 28 were confirmed LAEs, one was a nearby galaxy, and eight were unclassified. We also obtained spectra of another 24 NB816-excess objects in the field, identifying six additional LAEs. We find that the Ly alpha luminosity function derived from the photometric sample is reproduced well by a Schechter function with L* = 7.9(-2.2)(+3.0)x 10(42) ergs(-1) and phi* = 6.3(-2.0)(+3.0) x 10(-4) MpC(-3) for alpha -1.5 (fixed) over the whole luminosity range of L similar or equal to 3 x 10(42)-3 x 10(43) ergs(-1). We then measured the rest-frame Ly alpha equivalent widths for the confirmed LAEs, to find that the median among the 28 objects satisfying the photometric selection criteria is Wo(i) = 233 angstrom. We infer that 30%-40% of LAEs at z = 5.7 exceed Wo(i) = 240 .angstrom These large-EW objects probably cannot be accounted for by ordinary star-forming populations with a Salpeter IMF. We also find that LAEs with fainter far-UV luminosities have larger EWs. Finally, we derived the far-UV luminosity function of LAEs down to M-UV similar or equal to - 19.6 using the photometric sample, and compared it with that of Lyman-break galaxies (LBGs). We find that as high as about 80% of LBGs at z similar to 6 have Wo(i) >= 100 angstrom, in sharp contrast to lower-z Counterparts.
机译：我们在斯巴鲁深场中以z = 5.7表示Ly alpha发射器（LAE）的属性。在连续725 arcmin（2）区域中，从窄带数据直到NB816 = 26.0（AB），构造了89个LAE候选物的光度学样本。用Subaru和Keck 11望远镜获得了满足LAE光度选择标准的39个物体的光谱，其中28个被确认为LAE，一个是附近的星系，还有八个未被分类。我们还获得了野外另外24个NB816超标物体的光谱，确定了另外六个LAE。我们发现通过Schechter函数可以很好地重现从光度学样本得出的Ly alpha发光度函数，其中L * = 7.9（-2.2）（+ 3.0）x 10（42）ergs（-1）和phi * = 6.3（-在L的整个亮度范围内，α-1.5（固定）为2.0）（+ 3.0）x 10（-4）MpC（-3）（等于或等于3 x 10（42）-3 x 10（43）ergs（ -1）。然后，我们对已确认的LAE进行了静止帧Ly等效等效宽度的测量，以发现满足光度选择标准的28个对象中的中位数为Wo（i）= 233埃。我们推断，z = 5.7时，LAE的30％-40％超过Wo（i）= 240埃。这些大型电子天体可能无法由拥有Salpeter IMF的普通恒星形成群体解释。我们还发现，具有较弱的远紫外光度的LAE具有较大的EW。最后，我们使用光度学样本推导了LAE的远紫外光度函数，直至M-UV等于或等于-19.6，并将其与Lyman-break星系（LBG）进行了比较。我们发现，与z值较低的对口件形成鲜明对比的是，z处与6相似的LBG高达约80％，Wo（i）> = 100埃。

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