The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

INTEGRAL and Swift/XRT observations of the SFXT IGR J16479–4514: from quiescence to fast flaring activity

INTEGRAL and Swift/XRT observations of the SFXT IGR J16479–4514: from quiescence to fast flaring activity
INTEGRAL and Swift/XRT observations of the SFXT IGR J16479–4514: from quiescence to fast flaring activity
Context: the fast X-ray transient IGR J16479-4514 is known to display flares typically lasting a few hours. Recently, its counterpart has been identified with a supergiant star, therefore the source can be classified as a member of the newly discovered class of Supergiant Fast X-ray Transients (SFXTs); specifically, it is the one with the highest duty cycle.

Aims: characterize the quiescent X-ray behaviour of the source and compare its broad band spectrum to those during fast X-ray flares.

Methods: we analysed IBIS and JEM-X data with OSA 5.1, along with archival Swift/XRT data.

Results: we present results from a long-term monitoring of IGR J16479-4514 with detailed spectral and timing information on 19 bright fast X-ray flares, 10 of which are newly discovered. We also report the first results on the quiescent X-ray emission. The typical luminosity value (~1034 erg s-1) is about 2 orders of magnitude greater than what is typical of SFXTs, while its broad band X-ray spectrum has a shape very similar to the shape during fast X-ray transient activity, i.e. a rather steep power law with .

Conclusions: IGR J16479-4514 is characterised by a quiescent X-ray luminosity higher than what is typical of other known SFXTs but lower than persistent emission from classical SGXBs. We suggest that this source is a kind of transition object between these two systems, supporting the idea that there is a continuum of behaviour between the class of SFXTs and that of classical persistent SGXBs.
gamma rays: observations -- X-rays: binaries -- X-rays: bursts, x-rays: individuals: IGR J16479-4514, x-rays: general
0004-6361
619-623
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Malizia, A.
efa63850-cf26-482c-ae3b-54b0c8fb8a87
Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Landi, R.
b8243478-d7a1-4774-8a66-4158a65a33d3
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Malizia, A.
efa63850-cf26-482c-ae3b-54b0c8fb8a87
Masetti, N.
78166fad-2a82-4de5-9359-25706c0a6e2f
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb

Sguera, V., Bassani, L., Landi, R., Bazzano, A., Bird, A.J., Dean, A.J., Malizia, A., Masetti, N. and Ubertini, P. (2008) INTEGRAL and Swift/XRT observations of the SFXT IGR J16479–4514: from quiescence to fast flaring activity. Astronomy & Astrophysics, 487 (2), 619-623. (doi:10.1051/0004-6361:20079195).

Record type: Article

Abstract

Context: the fast X-ray transient IGR J16479-4514 is known to display flares typically lasting a few hours. Recently, its counterpart has been identified with a supergiant star, therefore the source can be classified as a member of the newly discovered class of Supergiant Fast X-ray Transients (SFXTs); specifically, it is the one with the highest duty cycle.

Aims: characterize the quiescent X-ray behaviour of the source and compare its broad band spectrum to those during fast X-ray flares.

Methods: we analysed IBIS and JEM-X data with OSA 5.1, along with archival Swift/XRT data.

Results: we present results from a long-term monitoring of IGR J16479-4514 with detailed spectral and timing information on 19 bright fast X-ray flares, 10 of which are newly discovered. We also report the first results on the quiescent X-ray emission. The typical luminosity value (~1034 erg s-1) is about 2 orders of magnitude greater than what is typical of SFXTs, while its broad band X-ray spectrum has a shape very similar to the shape during fast X-ray transient activity, i.e. a rather steep power law with .

Conclusions: IGR J16479-4514 is characterised by a quiescent X-ray luminosity higher than what is typical of other known SFXTs but lower than persistent emission from classical SGXBs. We suggest that this source is a kind of transition object between these two systems, supporting the idea that there is a continuum of behaviour between the class of SFXTs and that of classical persistent SGXBs.

This record has no associated files available for download.

More information

Published date: 4 August 2008
Keywords: gamma rays: observations -- X-rays: binaries -- X-rays: bursts, x-rays: individuals: IGR J16479-4514, x-rays: general

Identifiers

Local EPrints ID: 144807
URI: http://eprints.soton.ac.uk/id/eprint/144807
ISSN: 0004-6361
PURE UUID: 41970f04-701e-49d6-85ea-23e179f4dd2f
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 24 May 2010 14:28
Last modified: 09 Nov 2021 02:44

Export record

Altmetrics

Contributors

Author: V. Sguera
Author: L. Bassani
Author: R. Landi
Author: A. Bazzano
Author: A.J. Bird ORCID iD
Author: A.J. Dean
Author: A. Malizia
Author: N. Masetti
Author: P. Ubertini

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×