協辦單位
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協辦單位
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協辦單位
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名稱Title
2018天文年會
國立金門大學
5月18日至20日

論文摘要

Discovery of a distant supercluster at redshift 1.1

[ Oral ]

Tapish Narwal (NTHU, Hsinchu, Taiwan); Tomotsugu Goto(NTHU, Hsinchu, Taiwan )

We report a discovery of a distant supercluster, which we have found in the Dark Energy Survey Science Verification data (DES-SVA1). The supercluster is at a redshift of 1.1 and we measured a significant over-density of 2.6 sigma at a 90 cMpc scale, subtending a region of approximately 3.5 square degrees. We use photometric redshift estimated by SkyNet to locate our supercluster in the DES-SVA1 data. We select luminous galaxies using r- band absolute magnitudes (Mr < -18), and construct 2D maps in various redshift slices. Smoothed psuedo-3D density contrast maps are then constructed and over-dense regions are selected and analysed. The shape of the supercluster is not circular in the sky projection, so, the supercluster center is slightly offset from the point of maximum over-density. The over-dense region is then grown radially around the center and its significance is tested.