2011A&A...532A..73D


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.23CET00:48:06

2011A&A...532A..73D - Astronomy and Astrophysics, volume 532A, 73-73 (2011/8-1)

Evidence for a resonant cyclotron line in IGR J16493-4348 from the Swift-BAT hard X-ray survey.

D'AI A., CUSUMANO G., LA PAROLA V., SEGRETO A., DI SALVO T., IARIA R. and ROBBA N.R.

Abstract (from CDS):

Resonant absorption cyclotron features are a key diagnostic tool to directly measure the strength of the magnetic field of accreting neutron stars. However, typical values of cyclotron features lie in the high-energy part of the spectrum between 20keV and 50keV, where detection is often damped by the low quality statistics of results derived from single pointed observations. We show that long-term monitoring campaign performed with Swift-BAT of persistently, but faint, accreting high-mass X-ray binaries is able to reveal in their spectra the presence of cyclotron features. We extracted the average Swift-BAT 15-150keV spectrum from the 54 months long Swift-BAT survey of the high-mass X-ray source IGR J16493-4348. To constrain the broadband spectrum, we used soft X-ray spectra from Swift-XRT and Suzaku pointed observations. We model the spectra using a set of phenomenological models usually adopted to describe the energy spectrum of accreting high-mass X-ray binaries. Irrespective of the models we used, we found significant improvements in the spectral fits adding to the models a broad (10keV width) absorption feature, with best-fitting energy estimate between 30 and 33keV, that we interpret as evidence of a resonant cyclotron absorption feature. We also discuss possible instrumental biases related to the use of Swift-BAT for this kind of study and the statistical method to weight the confidence level of this detection. Correcting for the gravitational redshift of a 1.4M neutron star, the inferred surface magnetic field is Bsurf∼3.7*1012gauss. The spectral parameters of IGR J16493-4348 fit well with empirical correlations observed when the whole sample of high-mass binaries with detected cyclotron features is considered.

Abstract Copyright:

Journal keyword(s): magnetic fields - line: profiles - X-rays: binaries - X-rays: individuals: IGR J16493-4348

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 408 1
2 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 914 0
3 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 883 0
4 2E 1752 HXB 06 58 17.2878555250 -07 12 35.203675058   12.38 10.9 11.40   O9.7Ve 73 0
5 NAME AX J163904-4642 HXB 16 39 06 -46 42.2           BIV-V 80 1
6 2MASS J16415078-4532253 HXB 16 41 50.7854893198 -45 32 25.452141297           O8.5(sg?) 94 2
7 PSR J1649-4349 Psr 16 49 20.42 -43 49 22.2           ~ 18 0
8 2MASS J16492695-4349090 HXB 16 49 26.95 -43 49 09.0           B0.5Ib 47 0
9 HD 153295 HXB 17 00 25.2435284420 -42 19 00.280593627 9.05     9.52   B2e 70 0
10 XTE J1946+274 HXB 19 45 39.3569004855 +27 21 55.502556930   18.76 16.92 15.62 14.38 B0-1IV-Ve 104 0

    Equat.    Gal    SGal    Ecl

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2021.01.23-00:48:06

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