Microlensing variability in FBQ 0951+2635: short-time-scale events or a long-time-scale fluctuation ?

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27840

Title:	Microlensing variability in FBQ 0951+2635: short-time-scale events or a long-time-scale fluctuation ?
Authors:	Shalyapin,VN;Goicoechea,LJ;Koptelova,E;Artamonov,BP;Sergeyev,AV;Zheleznyak,AP;Akhunov,TA;Burkhonov,OA;Nuritdinov,SN;Ullan,A
Contributors:	天文研究所
Keywords:	GRAVITATIONAL LENS GALAXIES;EXTINCTION CURVES;LIGHT CURVES;QUASAR;DUST;QSO-0957+561;ENVIRONMENTS;ORIGIN;RATIOS;DELAY
Date:	2009
Issue Date:	2010-06-29 19:34:40 (UTC+8)
Publisher:	中央大學
Abstract:	We present and analyse new R-band frames of the gravitationally lensed double quasar FBQ 0951+2635. These images were obtained with the 1.5-m AZT-22 Telescope at Maidanak (Uzbekistan) during the 2001-2006 period. Previous results in the R band (1999-2001 period) and the new data allow us to discuss the dominant kind of microlensing variability in FBQ 0951+2635. The time evolution of the flux ratio A/B does not favour the continuous production of short-time-scale (similar to months) flares in the faintest quasar component B (crossing the central region of the lensing galaxy). Instead of a rapid variability scenario, the observations are consistent with the existence of a long-time-scale fluctuation. The flux ratio shows a bump during the 2003-2004 period and a quasi-flat trend in more recent epochs. Apart from the global behaviour of A/B, we study the intra-year variability over the first semester of 2004, which is reasonably well sampled. Short-time-scale microlensing is not detected in that period. Additional data in the i band (from new i-band images taken in 2007 with the 2-m Liverpool Robotic Telescope at La Palma, Canary Islands) also indicate the absence of short-time-scale events in 2007.
Relation:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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