The quantum states of high-Tc materials – States of topological resonances

Winkler, W.; Winkler, Kathrin

doi:10.1016/j.physc.2007.03.033

Cited by 7 publications

(13 citation statements)

References 71 publications

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“…The data reported here belong to the Core Programme [i.e. data collected as part of the INTEGRAL Galactic Plane Survey and Galactic Centre Deep Exposure (Winkler et al 2003)] as well as to public open time observations, and span from revolution 46 (2003 February) to revolution 234 (2004 September) included. A detailed description of the source extraction criteria can be found in Bird et al (2004, 2006); briefly, ISGRI images for each available pointing are generated in narrow energy bands using the INTEGRAL Science Data Centre (ISDC) offline scientific analysis software osa version 4.2 (Goldwurm et al 2003), including background uniformity corrections (Terrier et al 2003).…”

Section: Discussionmentioning

confidence: 99%

INTEGRAL observations of active galactic nuclei obscured by the Galactic plane

Molina¹,

Malizia²,

Bassani³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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In this paper, we present INTEGRAL observations of seven active galactic nuclei (AGNs): two newly discovered type 1 Seyferts, IGR J18027−1455 and J21247+5058 and five well‐known Seyferts, NGC 6814 (type 1.5), Cygnus A (type 2), MCG‐05‐23‐16 (type 2), ESO 103‐G035 (type 2) and GRS 1734‐292. For IGR J18027−1455 and J21247+5058, only INTEGRAL/IBIS data were available, while broad‐band spectra are presented and discussed for the remaining five sources for which either BeppoSAX or ASCA data were used in conjunction with INTEGRAL measurements. In the cases of NGC 6814 and GRS 1734‐292, data taken in different periods indicate variability in the flux: in the case of NGC 6814 by a factor of 16 over a period of about 10 years. Although limited in size, our sample can be used to investigate the parameter space of both the photon index and cut‐off energy. The mean photon index is 1.8, while the cut‐off energy ranges from 30–50 keV to greater than 200 keV; in the particular case of MCG‐05‐23‐16, ESO 103‐G035 and GRS 1734‐292, the cut‐off energy is well constrained at or below 100 keV. We have also tested an enlarged sample, which includes INTEGRAL data of three more AGNs, against the correlation found by a number of authors between the photon index and the cut‐off energy but have found no evidence for a relation between these two parameters. Our analysis indicates that there is a diversity in cut‐off energies in the primary continuum of Seyfert galaxies.

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Section: Discussionmentioning

confidence: 99%

INTEGRAL observations of active galactic nuclei obscured by the Galactic plane

Molina¹,

Malizia²,

Bassani³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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“…The analysed INTEGRAL (Winkler et al 2003) data consist of all public observations in which 4U 0513–40 was within the field of view of the high‐energy detectors. Broad‐band spectra, ∼5–80 keV, are obtained using data from the high‐energy instruments, JEM‐X (Lund et al 2003) and IBIS (Ubertini et al 2003).…”

Section: Observations and Data Analysismentioning

confidence: 99%

The 17-min orbital period in the ultracompact X-ray binary 4U 0513-40

Fiocchi

Bazzano

Natalucci

et al. 2011

Monthly Notices of the Royal Astronomical Society: Letters

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The ultracompact low‐mass X‐ray binary 4U 0513–40 in the globular cluster NGC1851 exhibits large amplitude X‐ray flux variations with spectral changes from low/hard to high/soft states which have not been reported previously in other ultracompact X‐ray binaries. Using BeppoSAX, Chandra and XMM–Newton archival data together with recent INTEGRAL observations, we reveal a clear sinusoidal periodic signal with a period of ∼17 min when the source is in a typical high/soft state with a dominant soft thermal component. The periodicity disappears when the source is in a low/hard state and the thermal soft component is not required any more to model the data. These properties indicate the orbital nature of the detected signal and imply an high inclination angle of the binary system (>80°).

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“…Since the launch of INTEGRAL (Winkler et al 2003) on 2002 October 17, LSI +61° 303 was several times in the field of view of the main instruments during the routine Galactic plane scans and pointed observations (see Table 1 for details). Most of the times the distance of the source from the centre of the field of view was too large to use the X‐ray monitor JEM‐X.…”

Section: Observations and Data Analysismentioning

confidence: 99%

INTEGRAL and XMM-Newton observations of LSI +61 303

Chernyakova

Neronov

Walter

2006

Monthly Notices of the Royal Astronomical Society

117

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LSI +61° 303 is one of the few X‐ray binaries with Be star companion from which both radio and high‐energy γ‐ray emission have been observed. We present XMM–Newton and INTEGRAL observations which reveal variability of the X‐ray spectral index of the system. The X‐ray spectrum is hard (photon index Γ≃ 1.5) during the orbital phases of both high and low X‐ray flux. However, the spectrum softens at the moment of transition from high to low X‐ray state. The spectrum of the system in the hard X‐ray band does not reveal the presence of a cut‐off (or, at least a spectral break) at 10–60 keV energies, expected if the compact object is an accreting neutron star. The observed spectrum and spectral variability can be explained if the compact object in the system is a rotation‐powered pulsar.

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The quantum states of high-Tc materials – States of topological resonances

Cited by 7 publications

References 71 publications

INTEGRAL observations of active galactic nuclei obscured by the Galactic plane

INTEGRAL observations of active galactic nuclei obscured by the Galactic plane

The 17-min orbital period in the ultracompact X-ray binary 4U 0513-40

INTEGRAL and XMM-Newton observations of LSI +61 303

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