Publication

Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint

Spiniello, C., Sergeyev, A. V., Marchetti, L., Tortora, C., Napolitano, N. R., Shalyapin, V., Agnello, A., Getman, F. I., Vaccari, M., Serjeant, S., Koopmans, L. V. E., Baker, A. J., Jarrett, T. H., Covone, G. & Vernardos, G., 1-Jun-2019, In : Monthly Notices of the Royal Astronomical Society. 485, p. 5086-5095 10 p.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Spiniello, C., Sergeyev, A. V., Marchetti, L., Tortora, C., Napolitano, N. R., Shalyapin, V., Agnello, A., Getman, F. I., Vaccari, M., Serjeant, S., Koopmans, L. V. E., Baker, A. J., Jarrett, T. H., Covone, G., & Vernardos, G. (2019). Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint. Monthly Notices of the Royal Astronomical Society, 485, 5086-5095. https://doi.org/10.1093/mnras/stz781

Author

Spiniello, C. ; Sergeyev, A. V. ; Marchetti, L. ; Tortora, C. ; Napolitano, N. R. ; Shalyapin, V. ; Agnello, A. ; Getman, F. I. ; Vaccari, M. ; Serjeant, S. ; Koopmans, L. V. E. ; Baker, A. J. ; Jarrett, T. H. ; Covone, G. ; Vernardos, G. / Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 485. pp. 5086-5095.

Harvard

Spiniello, C, Sergeyev, AV, Marchetti, L, Tortora, C, Napolitano, NR, Shalyapin, V, Agnello, A, Getman, FI, Vaccari, M, Serjeant, S, Koopmans, LVE, Baker, AJ, Jarrett, TH, Covone, G & Vernardos, G 2019, 'Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint', Monthly Notices of the Royal Astronomical Society, vol. 485, pp. 5086-5095. https://doi.org/10.1093/mnras/stz781

Standard

Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint. / Spiniello, C.; Sergeyev, A. V.; Marchetti, L.; Tortora, C.; Napolitano, N. R.; Shalyapin, V.; Agnello, A.; Getman, F. I.; Vaccari, M.; Serjeant, S.; Koopmans, L. V. E.; Baker, A. J.; Jarrett, T. H.; Covone, G.; Vernardos, G.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, 01.06.2019, p. 5086-5095.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Spiniello C, Sergeyev AV, Marchetti L, Tortora C, Napolitano NR, Shalyapin V et al. Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint. Monthly Notices of the Royal Astronomical Society. 2019 Jun 1;485:5086-5095. https://doi.org/10.1093/mnras/stz781


BibTeX

@article{39bc4e5b8530439fa32f6441bdf224b4,
title = "Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint",
abstract = "Quadruply lensed quasars are extremely rare objects, but incredibly powerful cosmological tools. Only few dozen are known in the whole sky. Here we present the spectroscopic confirmation of two new quadruplets WG0214-2105 and WG2100-4452 discovered by Agnello & Spiniello (2018) within the Dark Energy Survey public footprints. We have conducted spectroscopic follow-up of these systems with the Southern African Large Telescope as part of a program that aims at confirming the largest possible number of strong gravitational lenses in the equatorial and Southern hemisphere. For both systems, we present the sources spectra that allowed us to estimate their redshifts and unambiguously confirm their lensing nature. For the brighter deflector (WG2100-4452) we measure the spectroscopic redshift and the stellar velocity dispersion from optical absorption lines in the spectrum. For the other system we infer the lens redshift from photometry, being the quality of the spectra not good enough. We obtain photometry for both lenses, directly from multiband images, isolating the lenses from the quasars. One of the quadruplets, WG0214-2105, was also observed by Pan-STARRS, allowing us to estimate the apparent brightness of each quasar image at two different epochs, and thus to find evidence for flux variability. This result could suggest a microlensing event for the faintest components, although intrinsic variability cannot be excluded with only two epochs. Finally, we present simple lens models for both quadruplets, obtaining Einstein radii, singular isothermal ellipsoid velocity dispersions, ellipticities, and position angles of the lenses, as well as time-delay predictions assuming a concordance cosmological model.",
keywords = "gravitational lensing: strong, techniques: spectroscopic, surveys, galaxies: formation, Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics",
author = "C. Spiniello and Sergeyev, {A. V.} and L. Marchetti and C. Tortora and Napolitano, {N. R.} and V. Shalyapin and A. Agnello and Getman, {F. I.} and M. Vaccari and S. Serjeant and Koopmans, {L. V. E.} and Baker, {A. J.} and Jarrett, {T. H.} and G. Covone and G. Vernardos",
year = "2019",
month = jun,
day = "1",
doi = "10.1093/mnras/stz781",
language = "English",
volume = "485",
pages = "5086--5095",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - Spectroscopic confirmation and modelling of two lensed quadruple quasars in the Dark Energy Survey public footprint

AU - Spiniello, C.

AU - Sergeyev, A. V.

AU - Marchetti, L.

AU - Tortora, C.

AU - Napolitano, N. R.

AU - Shalyapin, V.

AU - Agnello, A.

AU - Getman, F. I.

AU - Vaccari, M.

AU - Serjeant, S.

AU - Koopmans, L. V. E.

AU - Baker, A. J.

AU - Jarrett, T. H.

AU - Covone, G.

AU - Vernardos, G.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Quadruply lensed quasars are extremely rare objects, but incredibly powerful cosmological tools. Only few dozen are known in the whole sky. Here we present the spectroscopic confirmation of two new quadruplets WG0214-2105 and WG2100-4452 discovered by Agnello & Spiniello (2018) within the Dark Energy Survey public footprints. We have conducted spectroscopic follow-up of these systems with the Southern African Large Telescope as part of a program that aims at confirming the largest possible number of strong gravitational lenses in the equatorial and Southern hemisphere. For both systems, we present the sources spectra that allowed us to estimate their redshifts and unambiguously confirm their lensing nature. For the brighter deflector (WG2100-4452) we measure the spectroscopic redshift and the stellar velocity dispersion from optical absorption lines in the spectrum. For the other system we infer the lens redshift from photometry, being the quality of the spectra not good enough. We obtain photometry for both lenses, directly from multiband images, isolating the lenses from the quasars. One of the quadruplets, WG0214-2105, was also observed by Pan-STARRS, allowing us to estimate the apparent brightness of each quasar image at two different epochs, and thus to find evidence for flux variability. This result could suggest a microlensing event for the faintest components, although intrinsic variability cannot be excluded with only two epochs. Finally, we present simple lens models for both quadruplets, obtaining Einstein radii, singular isothermal ellipsoid velocity dispersions, ellipticities, and position angles of the lenses, as well as time-delay predictions assuming a concordance cosmological model.

AB - Quadruply lensed quasars are extremely rare objects, but incredibly powerful cosmological tools. Only few dozen are known in the whole sky. Here we present the spectroscopic confirmation of two new quadruplets WG0214-2105 and WG2100-4452 discovered by Agnello & Spiniello (2018) within the Dark Energy Survey public footprints. We have conducted spectroscopic follow-up of these systems with the Southern African Large Telescope as part of a program that aims at confirming the largest possible number of strong gravitational lenses in the equatorial and Southern hemisphere. For both systems, we present the sources spectra that allowed us to estimate their redshifts and unambiguously confirm their lensing nature. For the brighter deflector (WG2100-4452) we measure the spectroscopic redshift and the stellar velocity dispersion from optical absorption lines in the spectrum. For the other system we infer the lens redshift from photometry, being the quality of the spectra not good enough. We obtain photometry for both lenses, directly from multiband images, isolating the lenses from the quasars. One of the quadruplets, WG0214-2105, was also observed by Pan-STARRS, allowing us to estimate the apparent brightness of each quasar image at two different epochs, and thus to find evidence for flux variability. This result could suggest a microlensing event for the faintest components, although intrinsic variability cannot be excluded with only two epochs. Finally, we present simple lens models for both quadruplets, obtaining Einstein radii, singular isothermal ellipsoid velocity dispersions, ellipticities, and position angles of the lenses, as well as time-delay predictions assuming a concordance cosmological model.

KW - gravitational lensing: strong

KW - techniques: spectroscopic

KW - surveys

KW - galaxies: formation

KW - Astrophysics - Astrophysics of Galaxies

KW - Astrophysics - Cosmology and Nongalactic Astrophysics

KW - Astrophysics - Instrumentation and Methods for Astrophysics

U2 - 10.1093/mnras/stz781

DO - 10.1093/mnras/stz781

M3 - Article

VL - 485

SP - 5086

EP - 5095

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -

ID: 118170308