2018A&A...616L..11K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:08:11

2018A&A...616L..11K - Astronomy and Astrophysics, volume 616, L11-11 (2018/8-1)

Gaia GraL: Gaia DR2 gravitational lens systems. I. New quadruply imaged quasar candidates around known quasars.

KRONE-MARTINS A., DELCHAMBRE L., WERTZ O., DUCOURANT C., MIGNARD F., TEIXEIRA R., KLUTER J., LE CAMPION J.-F., GALLUCCIO L., SURDEJ J., BASTIAN U., WAMBSGANSS J., GRAHAM M.J., DJORGOVSKI S.G. and SLEZAK E.

Abstract (from CDS):


Context. Multiply imaged gravitationally lensed quasars are among the most interesting and useful observable extragalactic phenomena. Because their study constitutes a unique tool in various fields of astronomy, they are highly sought, but difficult to find. Even in this era of all-sky surveys, discovering them remains a great challenge, with barely a few hundred systems currently known.
Aims. We aim to discover new multiply imaged quasar candidates in the recently published Gaia Data Release 2 (DR2), which is the astrometric and photometric all-sky survey with the highest spatial resolution that achieves effective resolutions from 0.4'' to 2.2''.
Methods. We cross-matched a merged list of quasars and candidates with Gaia DR2 and found 1839143 counterparts within 0.5''. We then searched matches with more than two Gaia DR2 counterparts within 6''. We further narrowed the resulting list using astrometry and photometry compatibility criteria between the Gaia DR2 counterparts. A supervised machine-learning method, called extremely randomized trees, was finally adopted to assign a probability of being lensed to each remaining system.
Results. We report the discovery of two quadruply imaged quasar candidates that are fully detected in Gaia DR2. These are the most promising new quasar lens candidates from Gaia DR2 and a simple singular isothermal ellipsoid lens model is able to reproduce their image positions to within ∼1mas. This Letter demonstrates the discovery potential of Gaia for gravitational lenses.

Abstract Copyright: © ESO 2018

Journal keyword(s): gravitational lensing: strong - quasars: general - astrometry - methods: data analysis - catalogs - surveys

Nomenclature: Fig .1, Table 2: [KDW2018] GRAL JHHMMSS+DDMMSS N=3, [KDW2018] GRAL JHHMMSS+DDMMSS A N=12.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
2 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 170 2
3 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 618 2
4 [KDW2018] GRAL J113100-441959 LS? 11 31 00.010 -44 19 59.87           ~ 2 0
5 QSO J1131-1231 QSO 11 31 51.5387 -12 31 58.716           ~ 205 1
6 [KDW2018] GRAL J122629-454209 LS? 12 26 29.0 -45 42 09           ~ 1 0
7 [VV2006] J133222.6+034739 QSO 13 32 22.6294 +03 47 39.912   18.99 18.54     ~ 28 0
8 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 549 6
9 [VV2006] J203342.1-472343 QSO 20 33 42.12 -47 23 43.9           ~ 84 1
10 [ALK2018] WGD J2038-4008 LS? 20 38 02.707 -40 08 13.59           ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:08:11

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