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Gravitational Lens System PS J0147+4630 (Andromeda's Parachute): Main Lensing Galaxy and Optical Variability of the Quasar Images

Abstract: Because follow?up observations of quadruple gravitational lens systems are of extraordinary importance for astrophysics and cosmology, we present single-epoch optical spectra and r-band light curves of PS J0147+4630. This recently discovered system mainly consists of four images ABCD of a background quasar around a foreground galaxy G that acts as a gravitational lens. First, we use long-slit spectroscopic data in the Gemini Observatory Archive and a multi-component fitting to accurately resolve the spectra of A, D, and G. The spectral profile of G resembles that of an early-type galaxy at a redshift of 0.678 ± 0.001, which is about 20% higher than the previous estimate. Additionally, the stellar velocity dispersion is measured to ~5% precision. Second, our early r-band monitoring with the Liverpool Telescope leads to accurate light curves of the four quasar images. Adopting time delays predicted by the lens model, the new lens redshift, and a standard cosmology, we report the detection of microlensing variations in C and D as large as ~0.1 mag on timescales of a few hundred days. We also estimate an actual delay between A and B of a few days (B is leading), which demonstrates the big potential of optical monitoring campaigns of PS J0147+4630.

 Fuente: ApJ 887 126 (2019)

Editorial: Institute of Physics Publishing

 Fecha de publicación: 01/12/2019

Nº de páginas: 8

Tipo de publicación: Artículo de Revista

 DOI: 10.3847/1538-4357/ab5063

ISSN: 0004-637X,1538-4357

Proyecto español: AYA2017-89815-P

Url de la publicación: https://doi.org/10.3847/1538-4357/ab5063