We discuss a spectroscopic survey of the strong lensing cluster A1489 that includes redshifts for 195 cluster members along with central velocity dispersions for 188 cluster members. The caustic technique applied to the redshift survey gives the dynamical parameters M (200) = (1.25 +/- 0.09) x 10(15) M (circle dot), R (200) = 1.97 +/- 0.05 Mpc, and a cluster line-of-sight velocity dispersion of 1150 +/- 72 km s(-1) within R (200). These parameters are very similar to those of other strong lensing systems with comparably large Einstein radii. We use the spectroscopy and deep photometry to demonstrate that A1489 is probably dynamically active; its four brightest cluster galaxies have remarkably different rest-frame radial velocities. Like other massive strong lensing clusters, the velocity dispersion function for members of A1489 shows an excess for dispersions greater than or similar to 250 km s(-1). The central dispersions also provide enhanced constraints on future lensing models.

A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489

Antonaldo Diaferio
2022-01-01

Abstract

We discuss a spectroscopic survey of the strong lensing cluster A1489 that includes redshifts for 195 cluster members along with central velocity dispersions for 188 cluster members. The caustic technique applied to the redshift survey gives the dynamical parameters M (200) = (1.25 +/- 0.09) x 10(15) M (circle dot), R (200) = 1.97 +/- 0.05 Mpc, and a cluster line-of-sight velocity dispersion of 1150 +/- 72 km s(-1) within R (200). These parameters are very similar to those of other strong lensing systems with comparably large Einstein radii. We use the spectroscopy and deep photometry to demonstrate that A1489 is probably dynamically active; its four brightest cluster galaxies have remarkably different rest-frame radial velocities. Like other massive strong lensing clusters, the velocity dispersion function for members of A1489 shows an excess for dispersions greater than or similar to 250 km s(-1). The central dispersions also provide enhanced constraints on future lensing models.
2022
Inglese
Esperti anonimi
930
2
156.1
156.12
12
https://iopscience.iop.org/article/10.3847/1538-4357/ac67a8/pdf
STATI UNITI D'AMERICA
4 – prodotto già presente in altro archivio Open Access (arXiv, REPEC…)
262
4
Kenneth J. Rines; Jubee Sohn; Margaret J. Geller; Antonaldo Diaferio
info:eu-repo/semantics/article
none
03-CONTRIBUTO IN RIVISTA::03A-Articolo su Rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1890595
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