| Autor: |
Agnello, A., Schechter, P. L., Morgan, N. D., Treu, T., Grillo, C., Malesani, D., Anguita, T., Apostolovski, Y., Rusu, C. E., Motta, V., Rojas, K., Chehade, B., Shanks, T. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1093/mnras/stx3226 |
| Popis: |
We report on discovery results from a quasar lens search in the ATLAS public footprint, extending quasar lens searches to a regime without $u-$band or fiber-spectroscopic information, using a combination of data mining techniques on multi-band catalog magnitudes and image-cutout modelling. Spectroscopic follow-up campaigns, conducted at the 2.6m Nordic Optical Telescope (La Palma) and 3.6m New Technology Telescope (La Silla) in 2016, yielded seven pairs of quasars exhibiting the same lines at the same redshift and monotonic flux-ratios with wavelength (hereafter NIQs, Nearly Identical Quasar pairs). The quasar redshifts range between $\approx1.2$ and $\approx 2.7;$ contaminants are typically pairs of bright blue stars, quasar-star alignments along the line of sight, and narrow-line galaxies at $0.3Comment: MNRAS subm. 14/09/17. Revised version after first referee report |
| Databáze: |
arXiv |
| Externí odkaz: |
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