New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates

V.D. Ivanov, M.R.L. Cioni, Kenji Bekki, R. De Grijs, J. Emerson, B.K. Gibson, D. Kamath, J.T. Van Loon, A.E. Piatti, Bi-Qing For

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Abstract

© ESO, 2016. Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z ~ 0.5 to z ~ 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of ~1500 quasars with Y<19.32 mag, J<19.09 mag, and Ks<18.04 mag.
Original languageEnglish
JournalAstronomy and Astrophysics
Volume588
DOIs
Publication statusPublished - 2016

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Magellanic clouds
quasars
near infrared
reference systems
census
European Southern Observatory
spectroscopy
galaxies
angular resolution
set theory
contamination
color
stars
high resolution

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Ivanov, V.D. ; Cioni, M.R.L. ; Bekki, Kenji ; De Grijs, R. ; Emerson, J. ; Gibson, B.K. ; Kamath, D. ; Van Loon, J.T. ; Piatti, A.E. ; For, Bi-Qing. / New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates. In: Astronomy and Astrophysics. 2016 ; Vol. 588.
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abstract = "{\circledC} ESO, 2016. Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z ~ 0.5 to z ~ 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of ~1500 quasars with Y<19.32 mag, J<19.09 mag, and Ks<18.04 mag.",
author = "V.D. Ivanov and M.R.L. Cioni and Kenji Bekki and {De Grijs}, R. and J. Emerson and B.K. Gibson and D. Kamath and {Van Loon}, J.T. and A.E. Piatti and Bi-Qing For",
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New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates. / Ivanov, V.D.; Cioni, M.R.L.; Bekki, Kenji; De Grijs, R.; Emerson, J.; Gibson, B.K.; Kamath, D.; Van Loon, J.T.; Piatti, A.E.; For, Bi-Qing.

In: Astronomy and Astrophysics, Vol. 588, 2016.

Research output: Contribution to journalArticle

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T1 - New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates

AU - Ivanov, V.D.

AU - Cioni, M.R.L.

AU - Bekki, Kenji

AU - De Grijs, R.

AU - Emerson, J.

AU - Gibson, B.K.

AU - Kamath, D.

AU - Van Loon, J.T.

AU - Piatti, A.E.

AU - For, Bi-Qing

PY - 2016

Y1 - 2016

N2 - © ESO, 2016. Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z ~ 0.5 to z ~ 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of ~1500 quasars with Y<19.32 mag, J<19.09 mag, and Ks<18.04 mag.

AB - © ESO, 2016. Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z ~ 0.5 to z ~ 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of ~1500 quasars with Y<19.32 mag, J<19.09 mag, and Ks<18.04 mag.

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DO - 10.1051/0004-6361/201527398

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JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

ER -