Gravitational Lens System PS J0147+4630 (Andromeda’s Parachute): Main Lensing Galaxy and Optical Variability of the Quasar Images
| Autor: | Vyacheslav N. Shalyapin, Luis J. Goicoechea |
|---|---|
| Přispěvatelé: | Universidad de Cantabria |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quasar microlensing 010504 meteorology & atmospheric sciences Broad-absorption line quasar Dark matter Strong gravitational lensing FOS: Physical sciences Astronomy Astronomy and Astrophysics Quasar Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Andromeda Gravitation Gravitational lens Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| Zdroj: | ApJ 887 126 (2019) UCrea Repositorio Abierto de la Universidad de Cantabria instname |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ab5063 |
| Popis: | 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 $\pm$ 0.001, which is about 20\% higher than the previous estimate. Additionally, the stellar velocity dispersion is measured to $\sim$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 $\sim$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. Comment: 12 pages, 8 figures, 2 tables. Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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