On the contribution of microlensing to X-ray variability of high - redshifted QSOs - INSPIRE

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On the contribution of microlensing to X-ray variability of high - redshifted QSOs

A.F. Zakharov
(
- Beijing Observ. and
- Moscow, ITEP and
- Lebedev Inst., Astro Space Ctr. and
- INI, Moscow
)
,
Luka C. Popovic
(
)
,
P. Jovanovic
(
- Astron. Observ., Belgrade and
- INI, Belgrade
)

Mar, 2004

8 pages

Published in:

Astron.Astrophys. 420 (2004) 881-888

e-Print:

astro-ph/0403254 [astro-ph]

DOI:

10.1051/0004-6361:20034035

View in:

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Abstract: (arXiv)

We consider a contribution of microlensing in X-ray variability of high-redshifted QSOs. Such an effect could be caused by stellar mass objects (SMO) located in a bulge or/and in a halo of this quasar as well as at cosmological distances between an observer and a quasar. Here, we not considerability of microlensing caused by deflectors in our Galaxy since it is well-known from recent MACHO, EROS and OGLE observations that the corresponding optical depth for the Galactic halo and the Galactic bulge is lower than

10^{-6}

. Cosmologically distributed gravitational microlenses could be localized in galaxies (or even in bulge or halo of gravitational macrolenses) or could be distributed in a uniform way. We have analyzed both cases of such distributions. As a result of our analysis, we obtained that an optical depth for microlensing caused by stellar mass objects is usually small for quasar bulge and quasar halo gravitational microlens distributions (

\tau\sim 10^{-4}

). On the other hand, the optical depth for gravitational microlensing caused by cosmologically distributed deflectors could be significant and could reach

10^{-2} - 0.1

at

z\sim 2

. It means that cosmologically distributed deflectors may significantlly contribute to the X-ray variability of high-redshifted QSOs (

z>2

). Considering that upper limit of the optical depth (

\tau\sim 0.1

) corresponds to the case when dark matter forms cosmologically distributed deflectors, therefore observations of X-ray variations of unlensend QSOs can be used for the estimation of the dark matter fraction of microlenses.

accretion, accretion disks
gravitational lensing
galaxies: quasars: general

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