2022A&A...657A.113L


Query : 2022A&A...657A.113L

2022A&A...657A.113L - Astronomy and Astrophysics, volume 657A, 113-113 (2022/1-1)

J1721+8842: a gravitationally lensed binary quasar with a proximate damped Lyman-α absorber.

LEMON C., MILLON M., SLUSE D., COURBIN F., AUGER M., CHAN J.H.H., PAIC E. and AGNELLO A.

Abstract (from CDS):

High-redshift binary quasars provide key insights into mergers and quasar activity, and are useful tools for probing the spatial kinematics and chemistry of galaxies along the line of sight. However, only three sub-10-kpc binaries have been confirmed above z = 1. Gravitational lensing would provide a way to easily resolve such binaries, study them in higher resolution, and provide more sightlines, though the required alignment with a massive foreground galaxy is rare. Through image deconvolution of StanCam Nordic Optical Telescope (NOT) monitoring data, we reveal two further point sources in the known, z ≃ 2.38, quadruply lensed quasar (quad) J1721+8842. An ALFOSC/NOT long-slit spectrum shows that the brighter of these two sources is a quasar with z = 2.369 ±0.007 based on the CIII] line, while the CIII] redshift of the quad is z = 2.364 ±0.003. Lens modelling using point-source positions rules out a single source model, favouring an isothermal lens mass profile with two quasar sources separated by ∼6.0 kpc (0.73'') in projection. Given the resolving ability from lensing and current lensed quasar statistics, this discovery suggests a large population of undiscovered, unlensed sub-10-kpc binaries. We also analyse spectra of two images of the quad, showing narrow Lyα emission within the trough of a proximate damped Lyman-α absorber (PDLA). An apparent mismatch between the continuum and narrow line flux ratios provides a new potential tool for simultaneously studying microlensing and the quasar host galaxy. Signs of the PDLA are also seen in the second source, but a deeper spectrum is still required to confirm this. Thanks to the multiple lines of sight from lensing and two quasar sources, this system offers simultaneous subparsec- and kiloparsec-scale probes of a PDLA.

Abstract Copyright: © ESO 2022

Journal keyword(s): gravitational lensing: strong - quasars: general - quasars: individual: J1721+8842

VizieR on-line data: <Available at CDS (J/A+A/657/A113): list.dat fits/*>

Status at CDS : Examining the need for a new acronym.

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10530 1
2 LB 79 QSO 01 05 34.7274469336 -27 36 57.919235262   18.0   17.7   ~ 43 0
3 DES J012006.38-435440.8 LS? 01 20 06.378 -43 54 40.61           ~ 3 0
4 PHL 1222 QSO 01 53 53.8926173376 +05 02 57.118052184   18.04 17.63     ~ 109 0
5 [MOK2016] SDSS J0818+0601 pair PaG 08 18 30.4 +06 01 38           ~ 2 0
6 [VV2006] J100859.5+035104 QSO 10 08 59.5611833328 +03 51 04.178611152   20.08 19.76     ~ 21 0
7 [VV2006] J115517.3+634622 QSO 11 55 17.3177 +63 46 22.074   19.31 18.66     ~ 33 1
8 [VV2006] J123821.6+010518 QSO 12 38 21.667 +01 05 18.67   19.59 19.20     ~ 30 0
9 QSO B1359+154 QSO 14 01 35.588 +15 13 24.15     21.90     ~ 72 1
10 [LAM2018] J1721+8842 LS? 17 21 49.01 +88 42 22.4           ~ 8 0
11 CLASS B1933+503 Rad 19 34 31.02 +50 25 23.5           ~ 84 1
12 [LAM2018] J2057+0217 LS? 20 57 52.07 +02 17 48.6           ~ 3 0
13 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 667 1

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2023.01.30-22:21:06

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