2020A&A...637A..89G

Query : 2020A&A...637A..89G

2020A&A...637A..89G - Astronomy and Astrophysics, volume 637A89-89 (2020/5-1)

Liverpool-Maidanak monitoring of the Einstein Cross in 2006-2019. I. Light curves in the gVrRI optical bands and microlensing signatures.

GOICOECHEA L.J., ARTAMONOV B.P., SHALYAPIN V.N., SERGEYEV A.V., BURKHONOV O.A., AKHUNOV T.A., ASFANDIYAROV I.M., BRUEVICH V.V., EHGAMBERDIEV S.A., SHIMANOVSKAYA E.V. and ZHELEZNYAK A.P.

Abstract (from CDS):

Quasar microlensing offers a unique opportunity to resolve tiny sources in distant active galactic nuclei and study compact object populations in lensing galaxies. We therefore searched for microlensing-induced variability of the gravitationally lensed quasar QSO 2237+0305 (Einstein Cross) using 4374 optical frames taken with the 2.0m Liverpool Telescope and the 1.5m Maidanak Telescope. These gVrRI frames over the 2006-2019 period were homogeneously processed to generate accurate long-term multi-band light curves of the four quasar images A-D. Through difference light curves, we found strong microlensing signatures. We then focused on the analytical modelling of two putative caustic-crossing events in image C, finding compelling evidence that this image experienced a double caustic crossing. Additionally, our overall results indicate that a standard accretion disc accounts reasonably well for the brightness profile of UV continuum emission sources and for the growth in source radius when the emission wavelength increases: R_λ∝λ^α, α=1.33±0.09. However, we caution that numerical microlensing simulations are required before firm conclusions can be reached on the UV emission scenario because the VRI-band monitoring during the first caustic crossing and one of our two α indicators lead to a few good solutions with α ~= 1.

Abstract Copyright: © ESO 2020

Journal keyword(s): techniques: photometric - methods: data analysis - gravitational lensing: strong - gravitational lensing: micro - quasars: individual: QSO 2237+0305

VizieR on-line data: <Available at CDS (J/A+A/637/A89): table4.dat-table8.dat table10.dat-table14.dat>

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	QSO J2240+0321	QSO	22 40 30.234	+03 21 30.63						~	705	1

Query : 2020A&A...637A..89G

Basic data :

QSO J2240+0321 -- Quasar
Other object types:	`QSO (2010A&A,QSO,...)`, `G (2016A&A,BWSH,...)`, `LeQ (1985AJ)`, `gLe (1984BAAS)`, `X ([WBS99])`, `Opt (LAMOST)`
ICRS coord. (ep=J2000) :	`22 40 30.234 +03 21 30.63 (Near-IR) [ ] C 2006AJ....131.1163S`
FK4 coord. (ep=B1950 eq=1950) :	`22 37 57.764 +03 05 49.97 [ ]`
Gal coord. (ep=J2000) :	`071.798764 -46.108533 [ ]`
Radial velocity / Redshift / cz :	`V(km/s) 227230 [~] / z(emission) 1.695 [~] / cz 508148 [~] (Opt) C 2017AJ....154..114O`

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`QSO J2240+0321`	`NAME Huchra's Lens`	`[VV2000] J224030.3+032130`	`[VV98] J224030.3+032130`
`BWSH C`	`QSO B2237+0305`	`[VV2003] J224030.3+032130`	`[WBS99] 1`
`KODIAQ J224030+032130`	`QSO B2237+030`	`[VV2006] J224030.3+032130`	`[Y88] G`
`LAMOST J224030.22+032130.3`	`[HB93] 2237+030`	`[VV2010] J224030.3+032130`
`NAME Einstein Cross`	`[HVG99b] 22379+0305`	`[VV96] J224030.3+032130`

References (705 between 1850 and 2026) (Total 705)
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