Subaru Telescope, National Astronomical Observatory of Japan, 650 N Aohoku Pl, Hilo, HI 96720, USA
U.S. Naval Observatory (USNO), 3450 Massachusetts Avenue NW, Washington, DC 20392, USA
Department of Physics, University of California, Davis, CA 95616, USA
Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan, Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 410007, India
We present results of a systematic search for gravitationally lensed quasars in Pan-STARRS1. Our final sample of candidates comprises of 91 systems, not including 25 rediscovered lensed quasars and quasar pairs. In the absence of spectroscopy to verify the lensing nature of the candidates, the main sources of contaminants are likely to be quasar pairs, which we consider to be a byproduct of our work, and a smaller number of quasar + star associations. Among the independently discovered quads is 2M1134−2103, for which we obtained spectroscopy for the first time, finding a redshift of 2.77 for the quasar. There is evidence for microlensing in at least one image. We perform detailed mass modelling of this system using archival imaging data, and find that the unusually large shear responsible for the diamond-like configuration can be attributed mainly to a faint companion ∼4 arcsec away, and to a galaxy group/cluster ∼30 arcsec away. We also set limits of z ∼ 0.5–1.5 on the redshift of the lensing galaxy, based on its brightness, the image separation of the lensed images, and an analysis of the observed photometric flux ratios.
Rusu, Cristian E., et al. "A search for gravitationally lensed quasars and quasar pairs in Pan-STARRS1: spectroscopy and sources of shear in the diamond 2M1134−2103." Monthly Notices of the Royal Astronomical Society, vol. 486, no. 4, May. 2019. https://doi.org/10.1093/mnras/stz1142
Rusu, Cristian E., Berghea, Ciprian T., Fassnacht, Christopher D., More, Anupreeta, Seman, Erica, Nelson, George J., & Chen, Geoff C-F (2019). A search for gravitationally lensed quasars and quasar pairs in Pan-STARRS1: spectroscopy and sources of shear in the diamond 2M1134−2103. Monthly Notices of the Royal Astronomical Society, 486(4). https://doi.org/10.1093/mnras/stz1142
Rusu, Cristian E., Berghea, Ciprian T., Fassnacht, Christopher D., et al., "A search for gravitationally lensed quasars and quasar pairs in Pan-STARRS1: spectroscopy and sources of shear in the diamond 2M1134−2103," Monthly Notices of the Royal Astronomical Society 486, no. 4 (2019), https://doi.org/10.1093/mnras/stz1142
@article{osti_1617052,
author = {Rusu, Cristian E. and Berghea, Ciprian T. and Fassnacht, Christopher D. and More, Anupreeta and Seman, Erica and Nelson, George J. and Chen, Geoff C-F},
title = {A search for gravitationally lensed quasars and quasar pairs in Pan-STARRS1: spectroscopy and sources of shear in the diamond 2M1134−2103},
annote = {Abstract We present results of a systematic search for gravitationally lensed quasars in Pan-STARRS1. Our final sample of candidates comprises of 91 systems, not including 25 rediscovered lensed quasars and quasar pairs. In the absence of spectroscopy to verify the lensing nature of the candidates, the main sources of contaminants are likely to be quasar pairs, which we consider to be a byproduct of our work, and a smaller number of quasar + star associations. Among the independently discovered quads is 2M1134−2103, for which we obtained spectroscopy for the first time, finding a redshift of 2.77 for the quasar. There is evidence for microlensing in at least one image. We perform detailed mass modelling of this system using archival imaging data, and find that the unusually large shear responsible for the diamond-like configuration can be attributed mainly to a faint companion ∼4 arcsec away, and to a galaxy group/cluster ∼30 arcsec away. We also set limits of z ∼ 0.5–1.5 on the redshift of the lensing galaxy, based on its brightness, the image separation of the lensed images, and an analysis of the observed photometric flux ratios.},
doi = {10.1093/mnras/stz1142},
url = {https://www.osti.gov/biblio/1617052},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {4},
volume = {486},
place = {United Kingdom},
publisher = {Oxford University Press},
year = {2019},
month = {05}}
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 486; ISSN 0035-8711