2017A&A...600A..79A


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.26CET01:03:02

2017A&A...600A..79A - Astronomy and Astrophysics, volume 600A, 79-79 (2017/4-1)

Apparent quasar disc sizes in the "bird's nest" paradigm.

ABOLMASOV P.

Abstract (from CDS):

Context. Quasar microlensing effects make it possible to measure the accretion disc sizes around distant supermassive black holes that are still well beyond the spatial resolution of contemporary instrumentation. The sizes measured with this technique appear inconsistent with the standard accretion disc model. Not only are the measured accretion disc sizes larger, but their dependence on wavelength is in most cases completely different from the predictions of the standard model.
Aims. We suggest that these discrepancies may arise not from non-standard accretion disc structure or systematic errors, as it was proposed before, but rather from scattering and reprocession of the radiation of the disc. In particular, the matter falling from the gaseous torus and presumably feeding the accretion disc may at certain distances become ionized and produce an extended halo that is free from colour gradients.
Methods. A simple analytical model is proposed assuming that a geometrically thick translucent inflow acts as a scattering mirror changing the apparent spatial properties of the disc. This inflow may be also identified with the broad line region or its inner parts.
Results. Such a model is able to explain the basic properties of the apparent disc sizes, primarily their large values and their shallow dependence on wavelength. The only condition required is to scatter a significant portion of the luminosity of the disc. This can easily be fulfilled if the scattering inflow has a large geometrical thickness and clumpy structure.

Abstract Copyright: © ESO, 2017

Journal keyword(s): accretion, accretion disks - scattering - gravitational lensing: micro - gravitational lensing: micro

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO J0158-4325 QSO 01 58 41.3988 -43 25 03.798   17.2 17.2     ~ 58 1
2 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 179 2
3 QSO J0924+0219 QSO 09 24 55.8048 +02 19 24.850   18.58 18.36     ~ 111 1
4 [VV98] J095122.6+263513 QSO 09 51 22.5840 +26 35 13.786   17.66 17.31     ~ 96 1
5 QSO B1001+4127 QSO 10 04 34.9236085542 +41 12 42.771226567   19.14 19.03     ~ 170 1
6 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 302 1
7 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 629 2
8 QSO J1131-1231 QSO 11 31 51.5387 -12 31 58.716           ~ 219 1
9 QSO J1138+0314 QSO 11 38 03.7479119406 +03 14 57.836414453   19.42 19.17     ~ 51 1
10 QSO B1520+530 QSO 15 21 44.8 +52 54 49   18.2       ~ 117 2
11 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 644 0
12 Z 378-15 G 22 40 30.23447 +03 21 30.6290           ~ 629 0

    Equat.    Gal    SGal    Ecl

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2020.11.26-01:03:02

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