Source Size Measurement from Observed Quasar Microlensing
نویسندگان
چکیده
منابع مشابه
Unambiguous quasar microlensing
Microlensing studies of quasars can reveal dark matter lumps over a broad mass spectrum; we highlight the importance of monitoring quasars which are seen through the halos of low-redshift galaxies. For these configurations microlensing by planetary-mass objects will manifest itself as isolated events which are only weakly chromatic. Statistical comparison of the observed optical depths with the...
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In the case of gravitationally-lensed quasars, it is well-known that there is a time delay between occurrence of the intrinsic variabilities in each split image. Generally, the source of variabilities has a finite size, and there are time delays even in one image. If the origin of variabilities is widely distributed, say over > ∼ 100 pc as whole, variabilities between split images will not show...
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Intergalactic Mg II absorbers are known to have structures down to scales ∼ 10pc, and there are now indications that they may be fragmented on scales . 10pc (Hao et al., astro-ph/0612409). I show that quasar microlensing can effectively probe Mg II and other absorption “cloudlets” with sizes ∼ 10 − 10pc by inducing significant spectral variability on the timescales of months to years. With nume...
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The first investigations of the response of the microlensing magnification pattern (at an optical depth of order unity) to the mass function of the microlenses found that the resulting statistics depend only on the mean microlens mass 〈m〉. In particular the mean microlensing caustic crossing rate was found to be proportional to
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Gravitational microlensing of quasars by stars in external galaxies can introduce fluctuations in the centroid of the “point-like” macro–images. The induced shifts are extremely small, on micro–arcsecond scales, below the limits of current optical observations. However, such shifts will become measurable with the proposed “Space Interferometry” mission, due to fly in 2005. The degree of the cen...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 2001
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as01014