Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky
International audience We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the two QSOs are widely different: one, our program target, is a QSO with a spectrum consistent with being a narrow line...
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ftsorbonneuniv:oai:HAL:hal-03645128v1 2024-09-15T18:14:02+00:00 Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky Heintz, K. E. Fynbo, J. P. U. Krogager, J. -K. Vestergaard, M. Møller, P. Arabsalmani, M. Geier, S. Noterdaeme, P. Ledoux, C. Saturni, F. G. Venemans, B. Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2016 https://hal.science/hal-03645128 https://doi.org/10.3847/0004-6256/152/1/13 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/arxiv/1604.01361 info:eu-repo/semantics/altIdentifier/doi/10.3847/0004-6256/152/1/13 hal-03645128 https://hal.science/hal-03645128 ARXIV: 1604.01361 BIBCODE: 2016AJ.152.13H doi:10.3847/0004-6256/152/1/13 The Astronomical Journal https://hal.science/hal-03645128 The Astronomical Journal, 2016, 152, ⟨10.3847/0004-6256/152/1/13⟩ quasars: general Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftsorbonneuniv https://doi.org/10.3847/0004-6256/152/1/13 2024-07-25T23:47:50Z International audience We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the two QSOs are widely different: one, our program target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 active galactic nucleus at z = 2.05. For this target we detect Lyα, C IV, and C III]. The other QSO, which by chance was included on the spectroscopic slit, is a Type 1 QSO at a redshift of z = 1.68, for which we detect C IV, C III], and Mg II. We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation. Based on observations made with the Nordic Optical Telescope, on the island of La Palma jointly operated by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Article in Journal/Newspaper Iceland HAL Sorbonne Université The Astronomical Journal 152 1 13 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
quasars: general Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies [SDU]Sciences of the Universe [physics] |
spellingShingle |
quasars: general Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies [SDU]Sciences of the Universe [physics] Heintz, K. E. Fynbo, J. P. U. Krogager, J. -K. Vestergaard, M. Møller, P. Arabsalmani, M. Geier, S. Noterdaeme, P. Ledoux, C. Saturni, F. G. Venemans, B. Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
topic_facet |
quasars: general Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies [SDU]Sciences of the Universe [physics] |
description |
International audience We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the two QSOs are widely different: one, our program target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 active galactic nucleus at z = 2.05. For this target we detect Lyα, C IV, and C III]. The other QSO, which by chance was included on the spectroscopic slit, is a Type 1 QSO at a redshift of z = 1.68, for which we detect C IV, C III], and Mg II. We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation. Based on observations made with the Nordic Optical Telescope, on the island of La Palma jointly operated by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. |
author2 |
Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Heintz, K. E. Fynbo, J. P. U. Krogager, J. -K. Vestergaard, M. Møller, P. Arabsalmani, M. Geier, S. Noterdaeme, P. Ledoux, C. Saturni, F. G. Venemans, B. |
author_facet |
Heintz, K. E. Fynbo, J. P. U. Krogager, J. -K. Vestergaard, M. Møller, P. Arabsalmani, M. Geier, S. Noterdaeme, P. Ledoux, C. Saturni, F. G. Venemans, B. |
author_sort |
Heintz, K. E. |
title |
Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
title_short |
Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
title_full |
Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
title_fullStr |
Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
title_full_unstemmed |
Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky |
title_sort |
serendipitous discovery of a projected pair of qsos separated by 4.5 arcsec on the sky |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-03645128 https://doi.org/10.3847/0004-6256/152/1/13 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
The Astronomical Journal https://hal.science/hal-03645128 The Astronomical Journal, 2016, 152, ⟨10.3847/0004-6256/152/1/13⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1604.01361 info:eu-repo/semantics/altIdentifier/doi/10.3847/0004-6256/152/1/13 hal-03645128 https://hal.science/hal-03645128 ARXIV: 1604.01361 BIBCODE: 2016AJ.152.13H doi:10.3847/0004-6256/152/1/13 |
op_doi |
https://doi.org/10.3847/0004-6256/152/1/13 |
container_title |
The Astronomical Journal |
container_volume |
152 |
container_issue |
1 |
container_start_page |
13 |
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1810451826218106880 |