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Broad absorption features in wind-dominated ultraluminous X-ray sources?

Broad absorption features in wind-dominated ultraluminous X-ray sources?
Broad absorption features in wind-dominated ultraluminous X-ray sources?
The luminosities of ultraluminous X-ray sources (ULXs) require an exotic solution with either supercritical accretion modes on to stellar-mass black holes or subcritical accretion on to intermediate-mass black holes (IMBHs) being invoked. Discriminating between the two is non-trivial due to the present lack of a direct mass measurement. A key expectation of the supercritical mode of accretion is the presence of powerful radiatively driven winds. Here we analyse XMM–Newton data from NGC 5408 X-1 and NGC 6946 X-1 and find that strong soft residuals present in the X-ray spectra can be reconciled with broadened, blueshifted absorption by a partially ionized, optically thin phase of this wind. We derive initial values for the physical parameters of the wind; we also discuss other possible origins for the observed features.
1745-3925
L51-L53
Middleton, Matthew
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Walton, Dominic J.
84f34f90-2aef-454b-b20e-98dc8a8b4b65
Roberts, Timothy P.
978a10ee-243e-4eaa-8a91-91aa06d35dc6
Lucy, Heil
408dbf58-fc8f-47e6-8c76-809ee87596d7
Middleton, Matthew
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Walton, Dominic J.
84f34f90-2aef-454b-b20e-98dc8a8b4b65
Roberts, Timothy P.
978a10ee-243e-4eaa-8a91-91aa06d35dc6
Lucy, Heil
408dbf58-fc8f-47e6-8c76-809ee87596d7

Middleton, Matthew, Walton, Dominic J., Roberts, Timothy P. and Lucy, Heil (2013) Broad absorption features in wind-dominated ultraluminous X-ray sources? Monthly Notices of the Royal Astronomical Society: Letters, L51-L53. (doi:10.1093/mnrasl/slt157).

Record type: Article

Abstract

The luminosities of ultraluminous X-ray sources (ULXs) require an exotic solution with either supercritical accretion modes on to stellar-mass black holes or subcritical accretion on to intermediate-mass black holes (IMBHs) being invoked. Discriminating between the two is non-trivial due to the present lack of a direct mass measurement. A key expectation of the supercritical mode of accretion is the presence of powerful radiatively driven winds. Here we analyse XMM–Newton data from NGC 5408 X-1 and NGC 6946 X-1 and find that strong soft residuals present in the X-ray spectra can be reconciled with broadened, blueshifted absorption by a partially ionized, optically thin phase of this wind. We derive initial values for the physical parameters of the wind; we also discuss other possible origins for the observed features.

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Accepted/In Press date: 30 October 2013
Published date: 12 December 2013

Identifiers

Local EPrints ID: 417562
URI: http://eprints.soton.ac.uk/id/eprint/417562
ISSN: 1745-3925
PURE UUID: 7f20053a-4dab-41af-8b3f-03d559680840

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Date deposited: 05 Feb 2018 17:30
Last modified: 13 Mar 2019 18:56

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Contributors

Author: Dominic J. Walton
Author: Timothy P. Roberts
Author: Heil Lucy

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