Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514

P. Romano, L. Sidoli, V. Mangano, S. Vercellone, Jamie A. Kennea, G. Cusumano, H. A. Krimm, David Nelson Burrows, N. Gehrels

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

IGR J16479-4514 is a supergiant fast X-ray transient (SFXT), a new class of high-mass X-ray binaries, whose number is rapidly growing thanks to the INTEGRAL observations of the Galactic plane. It has been regularly monitored with Swift XRT since 2007 November to study the quiescent emission, the outburst properties, and their recurrence. A new bright outburst, reaching fluxes above 10-9 erg cm-2 s-1 was caught by the Swift BAT. Swift immediately repointed at the target with the narrow-fleld instruments so that, for the first time, an outburst from an SFXT where a periodicity in the outburst recurrence is unknown could be observed simultaneously in the 0.2-150 keV energy band. The X-ray emission is highly variable and spans almost 4 orders of magnitude in count rate during the Swift XRT observations covering a few days before and after the bright peak. The Xray spectrum in outburst is hard and highly absorbed. The power-law flt resulted in a photon index of 0.98 ± 0.07, and in an absorbing column density of ∼5 x 1022cm -2. These observations demonstrate that in this source (similarly to what was observed during the 2007 outburst from the periodic SFXT IGR Jl 1215-5952), the accretion phase lasts much longer than a few hours.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume680
Issue number2 PART 2
DOIs
StatePublished - Jan 1 2008

Fingerprint

outburst
monitoring
x rays
energy bands
periodic variations
bycatch
coverings
erg
periodicity
power law
accretion
photons
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Romano, P., Sidoli, L., Mangano, V., Vercellone, S., Kennea, J. A., Cusumano, G., ... Gehrels, N. (2008). Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514. Astrophysical Journal, 680(2 PART 2). https://doi.org/10.1086/590082
Romano, P. ; Sidoli, L. ; Mangano, V. ; Vercellone, S. ; Kennea, Jamie A. ; Cusumano, G. ; Krimm, H. A. ; Burrows, David Nelson ; Gehrels, N. / Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514. In: Astrophysical Journal. 2008 ; Vol. 680, No. 2 PART 2.
@article{56f2a1a3d3784e2f8f37365eecbe0689,
title = "Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514",
abstract = "IGR J16479-4514 is a supergiant fast X-ray transient (SFXT), a new class of high-mass X-ray binaries, whose number is rapidly growing thanks to the INTEGRAL observations of the Galactic plane. It has been regularly monitored with Swift XRT since 2007 November to study the quiescent emission, the outburst properties, and their recurrence. A new bright outburst, reaching fluxes above 10-9 erg cm-2 s-1 was caught by the Swift BAT. Swift immediately repointed at the target with the narrow-fleld instruments so that, for the first time, an outburst from an SFXT where a periodicity in the outburst recurrence is unknown could be observed simultaneously in the 0.2-150 keV energy band. The X-ray emission is highly variable and spans almost 4 orders of magnitude in count rate during the Swift XRT observations covering a few days before and after the bright peak. The Xray spectrum in outburst is hard and highly absorbed. The power-law flt resulted in a photon index of 0.98 ± 0.07, and in an absorbing column density of ∼5 x 1022cm -2. These observations demonstrate that in this source (similarly to what was observed during the 2007 outburst from the periodic SFXT IGR Jl 1215-5952), the accretion phase lasts much longer than a few hours.",
author = "P. Romano and L. Sidoli and V. Mangano and S. Vercellone and Kennea, {Jamie A.} and G. Cusumano and Krimm, {H. A.} and Burrows, {David Nelson} and N. Gehrels",
year = "2008",
month = "1",
day = "1",
doi = "10.1086/590082",
language = "English (US)",
volume = "680",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART 2",

}

Romano, P, Sidoli, L, Mangano, V, Vercellone, S, Kennea, JA, Cusumano, G, Krimm, HA, Burrows, DN & Gehrels, N 2008, 'Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514', Astrophysical Journal, vol. 680, no. 2 PART 2. https://doi.org/10.1086/590082

Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514. / Romano, P.; Sidoli, L.; Mangano, V.; Vercellone, S.; Kennea, Jamie A.; Cusumano, G.; Krimm, H. A.; Burrows, David Nelson; Gehrels, N.

In: Astrophysical Journal, Vol. 680, No. 2 PART 2, 01.01.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Monitoring supergiant fast x-ray transients with swift. il rise to the outburst in IGR J16479-4514

AU - Romano, P.

AU - Sidoli, L.

AU - Mangano, V.

AU - Vercellone, S.

AU - Kennea, Jamie A.

AU - Cusumano, G.

AU - Krimm, H. A.

AU - Burrows, David Nelson

AU - Gehrels, N.

PY - 2008/1/1

Y1 - 2008/1/1

N2 - IGR J16479-4514 is a supergiant fast X-ray transient (SFXT), a new class of high-mass X-ray binaries, whose number is rapidly growing thanks to the INTEGRAL observations of the Galactic plane. It has been regularly monitored with Swift XRT since 2007 November to study the quiescent emission, the outburst properties, and their recurrence. A new bright outburst, reaching fluxes above 10-9 erg cm-2 s-1 was caught by the Swift BAT. Swift immediately repointed at the target with the narrow-fleld instruments so that, for the first time, an outburst from an SFXT where a periodicity in the outburst recurrence is unknown could be observed simultaneously in the 0.2-150 keV energy band. The X-ray emission is highly variable and spans almost 4 orders of magnitude in count rate during the Swift XRT observations covering a few days before and after the bright peak. The Xray spectrum in outburst is hard and highly absorbed. The power-law flt resulted in a photon index of 0.98 ± 0.07, and in an absorbing column density of ∼5 x 1022cm -2. These observations demonstrate that in this source (similarly to what was observed during the 2007 outburst from the periodic SFXT IGR Jl 1215-5952), the accretion phase lasts much longer than a few hours.

AB - IGR J16479-4514 is a supergiant fast X-ray transient (SFXT), a new class of high-mass X-ray binaries, whose number is rapidly growing thanks to the INTEGRAL observations of the Galactic plane. It has been regularly monitored with Swift XRT since 2007 November to study the quiescent emission, the outburst properties, and their recurrence. A new bright outburst, reaching fluxes above 10-9 erg cm-2 s-1 was caught by the Swift BAT. Swift immediately repointed at the target with the narrow-fleld instruments so that, for the first time, an outburst from an SFXT where a periodicity in the outburst recurrence is unknown could be observed simultaneously in the 0.2-150 keV energy band. The X-ray emission is highly variable and spans almost 4 orders of magnitude in count rate during the Swift XRT observations covering a few days before and after the bright peak. The Xray spectrum in outburst is hard and highly absorbed. The power-law flt resulted in a photon index of 0.98 ± 0.07, and in an absorbing column density of ∼5 x 1022cm -2. These observations demonstrate that in this source (similarly to what was observed during the 2007 outburst from the periodic SFXT IGR Jl 1215-5952), the accretion phase lasts much longer than a few hours.

UR - http://www.scopus.com/inward/record.url?scp=57849118137&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=57849118137&partnerID=8YFLogxK

U2 - 10.1086/590082

DO - 10.1086/590082

M3 - Article

AN - SCOPUS:57849118137

VL - 680

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 2

ER -