Gravitational microlensing - The effect of random motion of individual stars in the lensing galaxy

Citations Over TimeTop 18% of 1993 papers

Abstract

view Abstract Citations (32) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gravitational Microlensing: The Effect of Random Motion of Individual Stars in the Lensing Galaxy Kundic, Tomislav ; Wambsganss, Joachim Abstract We investigate the influence of random motion of individual stars in the lensing galaxy on the light curve of a gravitationally lensed background quasar. We compare this with the effects of the transverse motion of the galaxy. We find that three-dimensional random motion of stars with a velocity dispersion σ in each dimension is more effective in producing "peaks" in a microlensed light curve by a factor α ~ 1.3 than motion of the galaxy with a transverse velocity v_t_ = σ. This effectiveness parameter α seems to depend only weakly on the surface mass density. With an assumed transverse velocity of v_t_ = 600 km s^-1^ of the galaxy lensing the QSO 2237+0305 and a measured velocity dispersion of σ = 215 km s^-1^, the expected rate of maxima in the light curves calculated for bulk motion alone has to be increased by about 10% due to the random motion of stars. As a consequence, the average time interval {DELTA}t between two high-magnification events is smaller than the time interval {DELTA}t_bulk_, calculated for bulk motion alone, {DELTA}t~0.9{DELTA}t_bulk_. Publication: The Astrophysical Journal Pub Date: February 1993 DOI: 10.1086/172299 Bibcode: 1993ApJ...404..455K Keywords: Galaxies; Gravitational Lenses; Stellar Motions; Light Curve; Quasars; Astrophysics; GALAXIES: KINEMATICS AND DYNAMICS; COSMOLOGY: GRAVITATIONAL LENSING; GALAXIES: QUASARS: INDIVIDUAL ALPHANUMERIC: 2237; 0305 full text sources ADS | data products SIMBAD (2) NED (1)

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