First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins
We have analyzed images from the VST-ATLAS survey to identify candidate gravitationally lensed quasar systems in a sample of WISE sources with W1 - W2 ≥ 0.7.. Results from follow-up spectroscopy with the Baade 6.5 m telescope are presented for eight systems. One of them is a quadruply lensed quasar,...
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| 格式: | 文件 |
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IOP Publishing
2017
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| 在线阅读: | http://hdl.handle.net/1721.1/112104 https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0001-5226-8349 |
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| author | Chehade, B. Metcalfe, N. Shanks, T. McDonald, Michael A. Morgan, Nicholas D., 1975- Schechter, Paul L. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Chehade, B. Metcalfe, N. Shanks, T. McDonald, Michael A. Morgan, Nicholas D., 1975- Schechter, Paul L. |
| author_sort | Chehade, B. |
| collection | MIT |
| description | We have analyzed images from the VST-ATLAS survey to identify candidate gravitationally lensed quasar systems in a sample of WISE sources with W1 - W2 ≥ 0.7.. Results from follow-up spectroscopy with the Baade 6.5 m telescope are presented for eight systems. One of them is a quadruply lensed quasar, and two are doubly lensed systems. Two are projected superpositions of two quasars at different redshifts. In one system, two quasars, although at the same redshift, have very different emission line profiles and constitute a physical binary. In two systems, the component spectra are consistent with the lensing hypothesis, after allowing for microlensing. However, as no lensing galaxy is detected in these two systems, we classify them as lensless twins. More extensive observations are needed to establish whether they are in fact lensed quasars or physical binaries. |
| first_indexed | 2024-09-23T11:54:44Z |
| format | Article |
| id | mit-1721.1/112104 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:54:44Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1121042022-10-01T06:55:54Z First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins Chehade, B. Metcalfe, N. Shanks, T. McDonald, Michael A. Morgan, Nicholas D., 1975- Schechter, Paul L. MIT Kavli Institute for Astrophysics and Space Research Schechter, Paul L McDonald, Michael A. We have analyzed images from the VST-ATLAS survey to identify candidate gravitationally lensed quasar systems in a sample of WISE sources with W1 - W2 ≥ 0.7.. Results from follow-up spectroscopy with the Baade 6.5 m telescope are presented for eight systems. One of them is a quadruply lensed quasar, and two are doubly lensed systems. Two are projected superpositions of two quasars at different redshifts. In one system, two quasars, although at the same redshift, have very different emission line profiles and constitute a physical binary. In two systems, the component spectra are consistent with the lensing hypothesis, after allowing for microlensing. However, as no lensing galaxy is detected in these two systems, we classify them as lensless twins. More extensive observations are needed to establish whether they are in fact lensed quasars or physical binaries. 2017-11-01T15:42:52Z 2017-11-01T15:42:52Z 2017-04 2017-03 2017-10-19T14:04:55Z Article http://purl.org/eprint/type/JournalArticle 1538-3881 0004-6256 http://hdl.handle.net/1721.1/112104 Schechter, Paul L. et al. “First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins.” The Astronomical Journal 153, 5 (April 2017): 219 © 2017 The American Astronomical Society https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0001-5226-8349 http://dx.doi.org/10.3847/1538-3881/AA6899 Astronomical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Chehade, B. Metcalfe, N. Shanks, T. McDonald, Michael A. Morgan, Nicholas D., 1975- Schechter, Paul L. First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title | First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title_full | First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title_fullStr | First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title_full_unstemmed | First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title_short | First Lensed Quasar Systems from the VST-ATLAS Survey: One Quad, Two Doubles, and Two Pairs of Lensless Twins |
| title_sort | first lensed quasar systems from the vst atlas survey one quad two doubles and two pairs of lensless twins |
| url | http://hdl.handle.net/1721.1/112104 https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0001-5226-8349 |
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