June 2016
2016 / 06 / 07-08
decent conditions, but never great. Cirrus all of the second night, with seeing occasionally 0.7, but often 1 or worse. Night 1 was clear but somewhat worse seeing.
a1300 - 7(8?)x25 min
a2163 - 4x25, under best conditions of run
Reduction — results from Ramesh Mainali
I went through LDSS3 reductions for the data that you sent. The data contained observations from two masks in a2163 and a1300 clusters with integration time of 1.67 hr and 2.5 hr respectively.
As before, the reduction was performed using the standard COSMOS pipeline. From the "SMF" files, it appears that there were 10 lensed arc candidates in a2163 mask and a single arccandidate in a1300 mask. Emission lines were detected in 4 out of 10 candidate arcs in a2163 cluster, while the single arc in a1300 didn't show emission line. Here I want to present my emission line redshift determination for the candidate arcs. The object name are taken from the "SMF" files. Although there were few emission lines detected in cluster member galaxies, I don't provide their details. Additionally there are few arcs (arc3 in a1300, arc1 and arc3 in a2163) with continuum detection, I am trying to look more carefully for absorption line redshift.
1. Cluster a1300 (z=0.307):
Object RA DEC Notes
arc3 11:31:58.547 -19:54:50.77 Only candidate lensed arc in the mask. No emission lines detected.
2. Cluster a2163 (z=0.203):
Object RA DEC Detected Emission lines Spec_z
Arc4 16:15:47.999 -06:08:54.95 [OII]3727, [OIII]4959,5007, H-beta 0.730
Arc12 16:15:40.918 -06:09:09.05 [OIII]5007, H-alpha , [NII]6584 0.312
Arc13 16:15:43.911 -06:08:56.69 [OII]3727, [OIII]4959,5007, H-beta 0.729
Arc15 16:15:50.858 -06:08:45.19 [OII]3727, [OIII]4959,5007, H-beta 0.667