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Probing the nature of IGR J16493?4348: spectral and temporal analysis of the 1–100 keV emission

Probing the nature of IGR J16493?4348: spectral and temporal analysis of the 1–100 keV emission
Probing the nature of IGR J16493?4348: spectral and temporal analysis of the 1–100 keV emission
IGR J16493?4348 was one of the first new sources to be detected by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) ?-ray telescope in the 18-100 keV energy band. Based on spatial coincidence, the source was originally associated with the free radio pulsar PSR J1649?4349. Presented here are the results of 2.8 Ms of observations made by the INTEGRAL mission and a 5.6-ks observation with the Swift/X-ray Telescope (XRT). Spectral analysis indicates that the source is best modelled by an absorbed power law with a high energy cut-off at Ecut? 15 keV and a hydrogen absorbing column of NH= 5.4+1.3?1× 1022?cm?2 .

Analysis of the light curves indicates that the source is a weak, persistent ?-ray emitter showing indications of variability in the 2-9 and 22-100 keV bands. The average source flux is ?1.1 × 10?10?erg?cm?2?s?1 in the 1-100 keV energy band. No coherent timing signal is identified at any time-scale in the INTEGRAL or Swift data.

The refined source location and positional uncertainty of IGR J16493?4348 places PSR J1649?4349 outside the 90 per cent error circle. We conclude that IGR J16493?4348 is not associated with PSR J1649?4349. Combining the INTEGRAL observations with Swift/XRT data and information gathered by RXTE and Chandra, we suggest that IGR J16493?4348 is an X-ray binary, and that the source characteristics favour a high-mass X-ray binary although a low-mass X-ray binary nature cannot be ruled out.
gamma-rays, observations, x-rays, binaries, individual, IGR J16493?4348
1365-2966
423-429
Hill, A.B.
b1007941-b5b1-47cd-8476-7c6b9c57f347
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
McBride, V.A.
a4608811-5a3f-4218-ada0-28f57ec2a0fd
De Rosa, A.
b2a68e71-5c23-4649-94f0-1d8ffd40bb77
Bird, A.J.
b8d966b2-c863-48b1-8491-079333f98eba
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Hill, A.B.
b1007941-b5b1-47cd-8476-7c6b9c57f347
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
McBride, V.A.
a4608811-5a3f-4218-ada0-28f57ec2a0fd
De Rosa, A.
b2a68e71-5c23-4649-94f0-1d8ffd40bb77
Bird, A.J.
b8d966b2-c863-48b1-8491-079333f98eba
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1

Hill, A.B., Dean, A.J., Landi, R., McBride, V.A., De Rosa, A., Bird, A.J., Bazzano, A. and Sguera, V. (2008) Probing the nature of IGR J16493?4348: spectral and temporal analysis of the 1–100 keV emission. Monthly Notices of the Royal Astronomical Society, 385 (1), 423-429. (doi:10.1111/j.1365-2966.2008.12849.x).

Record type: Article

Abstract

IGR J16493?4348 was one of the first new sources to be detected by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) ?-ray telescope in the 18-100 keV energy band. Based on spatial coincidence, the source was originally associated with the free radio pulsar PSR J1649?4349. Presented here are the results of 2.8 Ms of observations made by the INTEGRAL mission and a 5.6-ks observation with the Swift/X-ray Telescope (XRT). Spectral analysis indicates that the source is best modelled by an absorbed power law with a high energy cut-off at Ecut? 15 keV and a hydrogen absorbing column of NH= 5.4+1.3?1× 1022?cm?2 .

Analysis of the light curves indicates that the source is a weak, persistent ?-ray emitter showing indications of variability in the 2-9 and 22-100 keV bands. The average source flux is ?1.1 × 10?10?erg?cm?2?s?1 in the 1-100 keV energy band. No coherent timing signal is identified at any time-scale in the INTEGRAL or Swift data.

The refined source location and positional uncertainty of IGR J16493?4348 places PSR J1649?4349 outside the 90 per cent error circle. We conclude that IGR J16493?4348 is not associated with PSR J1649?4349. Combining the INTEGRAL observations with Swift/XRT data and information gathered by RXTE and Chandra, we suggest that IGR J16493?4348 is an X-ray binary, and that the source characteristics favour a high-mass X-ray binary although a low-mass X-ray binary nature cannot be ruled out.

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More information

Published date: March 2008
Keywords: gamma-rays, observations, x-rays, binaries, individual, IGR J16493?4348

Identifiers

Local EPrints ID: 144819
URI: http://eprints.soton.ac.uk/id/eprint/144819
ISSN: 1365-2966
PURE UUID: 1fbb454a-76d7-495b-a11b-acc54aba65e3
ORCID for A.B. Hill: ORCID iD orcid.org/0000-0003-3470-4834

Catalogue record

Date deposited: 24 May 2010 13:20
Last modified: 14 Mar 2024 02:48

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Contributors

Author: A.B. Hill ORCID iD
Author: A.J. Dean
Author: R. Landi
Author: V.A. McBride
Author: A. De Rosa
Author: A.J. Bird
Author: A. Bazzano
Author: V. Sguera

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