2016A&A...587A..38W


Query : 2016A&A...587A..38W

2016A&A...587A..38W - Astronomy and Astrophysics, volume 587A, 38-38 (2016/3-1)

Limits on thickness and efficiency of Polish doughnuts in application to the ULX sources.

WIELGUS M., YAN W., LASOTA J.-P. and ABRAMOWICZ M.A.

Abstract (from CDS):

Polish doughnuts (PDs) are geometrically thick disks that rotate with super-Keplerian velocities in their innermost parts, and whose long and narrow funnels along rotation axes collimate the emerging radiation into beams. In this paper we construct an extremal family of PDs that maximize both geometrical thickness and radiative efficiency. We then derive upper limits for these quantities and subsequently for the related ability to collimate radiation. PDs with such extreme properties may explain the observed properties of ultraluminous X-ray sources without the need for the black hole masses to exceed ∼10 M. However, we show that strong advective cooling, which is expected to be one of the dominant cooling mechanisms in accretion flows with super-Eddington accretion rates, tends to reduce the geometrical thickness and luminosity of PDs substantially. We also show that the beamed radiation emerging from the PD funnels corresponds to isotropic luminosities that obey Lcol≃0.1(dM/dt)c2 for dM/dt≫dM/dtEdd, and not the familiar and well-known logarithmic relation, L∼ln(dM/dt).

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: jets - stars: black holes - black hole physics - X-rays: bursts - stars: neutron

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ESO 243-49 GiG 01 10 27.7550638752 -46 04 27.356310264 16.54 14.92   13.48   ~ 165 0
2 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 176 1
3 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 205 1
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5616 6
5 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 724 1
6 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 120 0
7 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2027 4
8 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2452 0
9 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1028 2

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2022.08.09-03:35:59

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