THE WFC3 INFRARED SPECTROSCOPIC PARALLEL (WISP) SURVEY

THE WFC3 INFRARED SPECTROSCOPIC PARALLEL (WISP) SURVEY
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WFC3 红外光谱平行 (WISP) 调查

DOI:
10.1088/0004-637x/723/1/104
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发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Atek H
Atek H
中科院分区:
--
文献类型:
--
作者:
Atek H

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我们介绍了WFC 3红外光谱并行(WISP)调查。WISP正在通过使用哈勃空间望远镜上的宽视场照相机三号以纯平行模式观测总共1250个轨道,获得1290个独立高纬度场的无缝近红外棱镜光谱。光谱是用G 102(λ= 0.8-1.17 μm,R = 210)和G 141(λ= 1.11-1.67 μm,R = 130)光栅获得的,同时在J和H波段(分别为F110 W和F140 W)直接成像。在本文中,我们提出了第一个结果从19 WISP领域,覆盖约63弧分2。对于典型的曝光时间(G 102中为6400 s,G 141中为2700 s),对于紧凑物体,我们达到f 5× 10 - 17 erg s-1 cm-2发射线的5σ检测限。典型的直接成像5σ极限为26.3和26.1 mag. (AB)F110 W和F140 W。限制我们自己以最高置信度测量的谱线,我们列出了229个物体中的328条发射谱线,红移范围为0.3< z< 3。单线发射体可能是Hα和[O iii] 5007,4959 Å的混合物,其中Hα占主导地位。在我们的样本中,高置信度发射线物体的整体表面密度约为每弧分2 4。这些领域显示高等效宽度源,活动星系核,和后星暴星系。我们的Hα选择样本的观测到的星星形成率(SFR)中位数为4 M yr-1。在中等红移时,我们在H 140 <$25或M R<− 19的星系中探测到发射线,并且对小于1 M yr− 1的SFR敏感。WFC 3上的无缝grisms提供了一个独特的机会,研究星系的光谱特性比L* 暗得多,在星系组装时代的高峰。
We present the WFC3 Infrared Spectroscopic Parallel (WISP) Survey. WISP is obtaining slitless, near-infrared grism spectroscopy of∼ 90 independent, high-latitude fields by observing in the pure-parallel mode with the Wide Field Camera Three on the Hubble Space Telescope for a total of∼ 250 orbits. Spectra are obtained with the G 102 (λ= 0.8–1.17 μm, R∼ 210) and G 141 grisms (λ= 1.11–1.67 μm, R∼ 130), together with direct imaging in the J and H bands (F110W and F140W, respectively). In the present paper, we present the first results from 19 WISP fields, covering approximately 63 arcmin 2. For typical exposure times (∼ 6400 s in G 102 and∼ 2700 s in G 141), we reach 5σ detection limits for emission lines of f∼ 5× 10− 17 erg s− 1 cm− 2 for compact objects. Typical direct imaging 5σ limits are 26.3 and 26.1 mag.(AB) in F110W and F140W, respectively. Restricting ourselves to the lines measured with the highest confidence, we present a list of 328 emission lines, in 229 objects, in a redshift range 0.3< z< 3. The single-line emitters are likely to be a mix of Hα and [O iii] 5007, 4959 Å, with Hα predominating. The overall surface density of high-confidence emission-line objects in our sample is approximately 4 per arcmin 2. These first fields show high equivalent width sources, active galactic nucleus, and post-starburst galaxies. The median observed star formation rate (SFR) of our Hα-selected sample is 4 M☉ yr− 1. At intermediate redshifts, we detect emission lines in galaxies as faint as H 140∼ 25, or M R<− 19, and are sensitive to SFRs down to less than 1 M☉ yr− 1. The slitless grisms on WFC3 provide a unique opportunity to study the spectral properties of galaxies much fainter than L* at the peak of the galaxy assembly epoch.
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