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- W2189585231 abstract "We searched for z = 7.3 Lyα emitters (LAEs) behind two gravitationally lensing clusters, Abell 2390 and CL 0024, using the Subaru Telescope Suprime-Cam and a narrowband filter NB1006 (λc ∼ 1005 nm, FWHM ∼ 21 nm). The combination of the fully depleted CCDs of the Suprime-Cam, sensitive to z ∼ 7 Lyα emission at ∼ 1 �m, and the magnification by the lensing clusters can be potentially a powerful tool to detect faint distant LAEs. Using the NB1006 and deep optical to mid-infrared images of the clusters taken with the Hubble and Spitzer Space Telescopes, we investigated if there exist objects consistent with the color of z = 7.3 LAEs behind the clusters. We could not detect any LAEs to the unlensed Lyα line flux limit of FLy� ≃ 6.9×10 18 erg s 1 cm 2 . Using several z = 7 Lyα luminosity functions (LFs) from the literatures, we estimated and compared the expected detection numbers of z ∼ 7 LAEs in lensing and blank field surveys in the case of using an 8m class ground based telescope. Given the steep bright-end slope of the LFs, when the detector field-of view (FOV) is comparable to the angular extent of a massive lensing cluster, imaging cluster(s) is more efficient in detecting z ∼ 7 LAEs than imaging a blank field. However, the gain is expected to be modest, a factor of two at most and likely much less depending on the adopted LFs. The main advantage of lensing-cluster survey, therefore, remains to be the gain in depth and not necessarily in detection efficiency. For much larger detectors, the lensing effect becomes negligible and the efficiency of LAE detection is proportional to the instrumental FOV. We also investigated the NB1006 images of the three z ∼ 7 z-dropout galaxy candidates previously detected in Abell 2390 and found that none of them are detected in the NB1006. Two of them are consistent with the predictions from the previous studies that they would be at lower redshifts. The other one has a photometric redshift of z ≃ 7.3, and if we assume that it is at z = 7.3, the unlensed Lyα line flux would be very faint: FLy� < 4.4 × 10 18 erg s 1 cm 2 (1σ upper limit) or equivalent width of W rest Ly� < 26u Its Lyα emission might be attenuated by neutral hydrogen, as recent studies show that the fraction of Lyman break galaxies displaying strong Lyα emission is lower at z ∼ 7 than at z . 6." @default.
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- W2189585231 date "2013-01-01" @default.
- W2189585231 modified "2023-10-16" @default.
- W2189585231 title "A Search for z = 7.3 LyEmitters behind Gravitationally" @default.
- W2189585231 hasPublicationYear "2013" @default.
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