CLASH: EXTREME EMISSION-LINE GALAXIES AND THEIR IMPLICATION ON SELECTION OF HIGH-REDSHIFT GALAXIES

CLASH: EXTREME EMISSION-LINE GALAXIES AND THEIR IMPLICATION ON SELECTION OF HIGH-REDSHIFT GALAXIES
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冲突:极端发射线星系及其对高红移星系选择的影响

DOI:
10.1088/0004-637x/801/1/12
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发表时间:
2014-12
影响因子:
4.9
通讯作者:
Kelso
Kelso
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Huang Xingxing;Zheng Wei;Wang Junxian;Ford Holl;Lemze Doron;Moustakas John;Shu Xinwen;Van der Wel Arjen;Zitrin Adi;Frye Brenda L.;Postman Marc;Bartelmann Matthias;Benitez Narciso;Bradley Larry;Broadhurst Tom;Coe Dan;Donahue Megan;Infante Leopoldo;Kelso

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我们利用星系团透镜和超新星调查与哈勃观测25个星系团来寻找极端发射线星系(EELGs)。在两个中心波段:F105W (Y105)和F125W (J125)上进行选择,因为[O iii] λλ4959, 5007的存在可以增强中心波段的通量,红移分别为~ 0.93-1.14和1.57-1.79。多波段观测有助于约束发射线的等效宽度(EWs)。利用聚类透镜效应,我们能够识别出52个候选点,其固有极限星等为28.5,静点为λλ 4959,5007 EW(≈3700 Å)。我们的样本包括一些在其他调查中没有发现的较低光度的EELGs,而极高的EW只能在这样微弱的星系中发现。当信噪比有限或波段覆盖不完全时,这些EELGs可以模拟类似于高红移星系的dropout特征,并污染高红移星系的颜色选择。
We utilize the Cluster Lensing And Supernova survey with Hubble observations of 25 clusters to search for extreme emission-line galaxies (EELGs). The selections are carried out in two central bands: F105W (Y105) and F125W (J125), as the flux of the central bands could be enhanced by the presence of [O iii] λλ4959, 5007 at redshifts of ∼0.93–1.14 and 1.57–1.79, respectively. The multiband observations help to constrain the equivalent widths (EWs) of emission lines. Thanks to cluster lensing, we are able to identify 52 candidates down to an intrinsic limiting magnitude of 28.5 and to a rest-frame [O iii] λλ4959, 5007 EW of ≃ 3700 Å. Our samples include a number of EELGs at lower luminosities that are missed in other surveys, and the extremely high EW can only be found in such faint galaxies. These EELGs can mimic a dropout feature similar to that of high-redshift galaxies and contaminate the color–color selection of high-redshift galaxies when the signal-to-noise ratio is limited or the band coverage is incomplete.
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