2002/06/24 by Swara Ravindranath, Luis C. Ho · 10 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Cluster (spacecraft) #Emission spectrum #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Line (geometry) #Redshift #Spectral line #Spectroscopy #astro-ph
paper · pdf · doi:10.1086/342124
published in The Astrophysical Journal 577(1), 133-138 (IOP Publishing) · To appear in The Astrophysical Journal (September 2002). 6 pages
arxiv created 2002/06/24 · openalex publication_date 2002/09/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present imaging and spectroscopic observations of the gravitationally lensed arcs in the field of RX J1347.5-1145, the most X-ray luminous galaxy cluster known. Based on the detection of the [O II] λ3727 emission line, we confirm that the redshift of one of the arcs is z = 0.806. Its color and [O II] line strength are consistent with those of distant, actively star-forming galaxies. In a second arc, we tentatively identify a pair of absorption lines superposed on a red continuum; the lines are consistent with Ca II λ3933 (K) and Ca II λ3968 (H) at z = 0.785. We detected a faint blue continuum in two additional arcs, but no spectral line features could be measured. We establish lower limits to their redshifts based on the absence of [O II] emission, which we argue should be present and detectable in these objects. Redshifts are also given for a number of galaxies in the field of the cluster.