The time delay in the twin QSO Q0957 + 561

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115634· OSTI ID:6104972

Schild, R E ^[1]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA)

From 10 yr of brightness monitoring of the two gravitational mirage components of Q0957 + 561 A,B it is shown that the time delay is 1.11 yr. An intensive program of daily brightness monitoring suggests a further refinement of the time delay to 404 days. Careful superposition of the phased brightness records shows that small differences are seen. These differences are attributed to microlensing by a star or stars in the lens galaxy. 5 refs.

• OSTI ID: 6104972
• Journal Information: Astronomical Journal; (USA), Vol. 100; ISSN 0004-6256
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
QUASARS
IMAGES
TIME DELAY
BRIGHTNESS
CORRELATIONS
GRAVITATIONAL LENSES
MONITORING
PHOTOMETRY
TELESCOPES
COSMIC RADIO SOURCES
LENSES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources