VizieR Online Data Catalog: Monitoring of the double quasar SDSS J1442+4055 (Shalyapin+, 2019)
Abstract
We have monitored the double quasar SDSS J1442+4055 over three complete observing seasons from 2015 December 23 to 2018 August 28. All photometric observations were made in the r band with the IO:O camera on the 2m Liverpool Telescope (LT). We obtained frames of the lensed quasar for 135 observing epochs (nights). See Section 2.1.
We also performed spectroscopic observations of SDSS J1442+4055 on 2016 March 5 using the OSIRIS instrument on the 10.4m Gran Telescopio Canarias (GTC). We took a 2850 (3x950)s GTC-OSIRIS exposure with each of two grisms, R500B and R500R. See Section 2.2. In the vicinity of the double quasar, there is a secondary lensing galaxy (G2). The two galaxies G1 and G2 are <5" apart, so they could be physically associated. To identify G2 and another bright field galaxy (G3), both objects were spectroscopically observed on 2016 June 8 with the SPRAT instrument on the LT. See Section 2.3. (4 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- August 2020
- DOI:
- 10.26093/cds/vizier.18730117
- Bibcode:
- 2020yCat..18730117S
- Keywords:
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- Gravitational lensing;
- QSOs;
- Photometry: RI;
- Spectra: optical Galaxies: spectra