The catalog of variable sources detected by<i>INTEGRAL</i>

Telezhinsky, I.; Eckert, D.; Savchenko, V.; Neronov, A.; Produit, N.; Courvoisier, T. J. L.

doi:10.1051/0004-6361/200912216

Cited by 8 publications

(10 citation statements)

References 42 publications

(48 reference statements)

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“…It must be noted that the source significance is often at the sensitivity limit, not allowing a proper characterization of the long‐term variability properties within their INTEGRAL light curves. NGC 4051 is the only source in our sample which belongs to the list of variable INTEGRAL sources edited by Telezhinsky et al (2010).…”

Section: Resultsmentioning

confidence: 99%

“…The broad-band spectrum for three sources of our sample (i.e., NGC 4051, Mrk 766 and NGC 5506) has previously been studied in the literature (Terashima et al 2009, Turner et al 2007and Guainazzi et al 2010. For the purpose of a general broad-band statistical analysis of the total sample, we have used the best-fit spectral parameters reported in literature for these three sources, using the averaged spectral values and fluxes.…”

Section: Broad-band Spectral Analysismentioning

confidence: 99%

“…BeppoSAX observations of a small sample of NLSy1 detected hard X-ray emission in only 2 out of 7 sources (Comastri 2000). Suzaku is now providing detailed broad-band studies of targeted NLSy1 (e.g., Ponti et al 2010, Miniutti et al 2009, Terashima et al 2009). Recent hard X-ray surveys performed by the IBIS instrument (Ubertini et al 2003) on board INTEGRAL (Winkler et al 2003) and the Burst Alert Telescope (BAT, Barthelmy et al 2005) on board Swift (Geherels et al 2004) are imaging the hard X-ray sky providing a number of sources detected for the first time at these energies with half of them being newly discovered (Malizia et al 2010, Landi et al 2010, Tueller et al 2010, Tueller et al 2009, Ajello et al 2008, Winter et al 2008, Bassani et al 2006.…”

Section: Introductionmentioning

confidence: 99%

“…In 5 other objects, XRT data are available below 10 keV, and, for IGR J16426+6536, only an XRT detection is available. Published best-fit spectral parameters for NGC 4051, Mrk 766 and NGC 5506 were taken from the most recent X-ray dedicated works (Terashima et al 2009, Turner et al 2007and Guainazzi et al 2010.…”

Section: Introductionmentioning

confidence: 99%

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Narrow-line Seyfert 1 galaxies at hard X-rays★

Panessa¹,

Rosa²,

Bassani³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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Narrow‐line Seyfert 1 (NLSy1) galaxies are a peculiar class of type 1 active galactic nuclei (broad‐line Seyfert 1 galaxies, hereinafter BLSy1). The X‐ray properties of individual objects belonging to this class are often extreme and associated with accretion at high Eddington ratios. Here, we present a study on a sample of 14 NLSy1 galaxies selected at hard X‐rays (>20 keV) from the fourth INTEGRAL/IBIS catalogue. The 20–100 keV IBIS spectra show hard‐X‐ray photon indices flatly distributed (Γ20−100 keV ranging from ∼1.3 to ∼3.6) with an average value of 〈Γ20−100 keV〉= 2.3 ± 0.7, compatible with a sample of hard‐X‐ray BLSy1 average slopes. Instead, NLSy1 galaxies show steeper spectral indices with respect to BLSy1 galaxies when broad‐band spectra are considered. Indeed, we combine XMM–Newton and Swift/XRT with INTEGRAL/IBIS data sets to obtain a wide energy spectral coverage (0.3–100 keV). A constraint on the high energy cut‐off and on the reflection component is achieved only in one source, SWIFT J2127.4+5654 (Ecut‐off∼ 50 keV, R= 1.0+0.5− 0.4). Hard‐X‐ray‐selected NLSy1 galaxies do not display particularly strong soft excess emission, while absorption fully or partially covering the continuum is often measured as well as Fe line emission features. Variability is a common trait in this sample, both at X‐rays and at hard X‐rays. The fraction of NLSy1 galaxies in the hard‐X‐ray sky is likely to be ∼15 per cent, in agreement with estimates derived in optically selected NLSy1 samples. We confirm the association of NLSy1 galaxies with small black hole masses with a peak at 107 M⊙ in the distribution; however, hard‐X‐ray NLSy1 galaxies seem to occupy the lower tail of the Eddington ratio distribution of classical NLSy1 galaxies.

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Section: Resultsmentioning

confidence: 99%

Section: Broad-band Spectral Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Narrow-line Seyfert 1 galaxies at hard X-rays★

Panessa¹,

Rosa²,

Bassani³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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“…The COMPTEL mission onboard CGRO and INTEGRAL have pioneered the field of MeV astronomy which still in its infancy. They have provided the first catalogues of soft gamma-ray sources [1,2,3,4] and an Al-26 all-sky map showing the Galactic supernova history [5]. The diversity of the types of sources found is suprisingly large, including low-and high-mass accreting binaries, pulsars and pulsar wind nebulae, magnetars, cataclysmic variables, novae, radio galaxies, blazars, Seyfert galaxies, or the Coma cluster of galaxies.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Universe from hard X-rays to gamma rays with GRIPS

Mannheim¹,

Greiner

2011

Proceedings of 25th Texas Symposium on Relativistic Astrophysics — PoS(Texas 2010)

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The Universe is still largely unexplored between hard X-rays and 100 MeV gamma rays. Using advanced detector technology, the combined pair and Compton telescope GRIPS can achieve a sensitivity improvement by a factor of up to 40 compared with previous observatories. The gamma ray imaging, polarimetry, and spectroscopy mission GRIPS would be a pathfinder in the transient Universe, discovering the most redshifted gamma ray bursts and blazars, detecting for the first time the primary 56 Ni from supernovae, identifying sources of cosmic ray nuclei, exploring white territory in the plasma chart by measuring the emission of magnetars, and resolving the structure of the enigmatic pair halo of our Galaxy.

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The populations of hard X-ray andγ-ray sources: a correlation study and new possible identifications

Maselli

Cusumano²,

Massaro³

et al. 2011

A&A

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Aims. We present the results of our analysis devoted to researching Galactic and extragalactic sources emitting in the energy bands surveyed by both the Swift-BAT and the Fermi-LAT telescopes. Methods. We cross-correlated the Fermi-LAT 1-year point source catalogue (1FGL) of gamma-ray sources and the second Palermo BAT catalogue (2PBC) of hard X-ray sources, establishing a correspondence between sources when their error boxes overlap. With dedicated software for reducing BAT data, we also extracted the value of the detection significance σ in the BAT 15-150 keV all-sky map in the direction of the 1FGL sources and took those above the threshold σ T = 3 into account. Results. We obtain 62 firm correspondences by cross-correlating the 1FGL and 2PBC catalogues and verifying the agreement between the identified counterparts. The number of objects emitting in both the hard X-ray and the γ-ray energy bands rises to 104 (∼7% of all the 1FGL objects) when considering all the sources with a detection significance down to σ T . This group of objects is made of 82 extragalactic sources, the largest number of which are blazars, 15 Galactic sources, and seven unidentified objects. We discuss the blazar content of the collected 1FGL-2PBC sources and compare their redshift distribution with that of the whole blazar population as reported in the second edition of the BZCAT blazar catalogue. We describe in greater detail the properties of two unidentified sources at low Galactic latitude, 1FGL J0137.8+5814 and 1FGL J2056.7+4938, and support their classification as blazars after the analysis of their broad-band spectral energy distribution.

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The catalog of variable sources detected byINTEGRAL

Cited by 8 publications

References 42 publications

Narrow-line Seyfert 1 galaxies at hard X-rays★

Narrow-line Seyfert 1 galaxies at hard X-rays★

Exploring the Universe from hard X-rays to gamma rays with GRIPS

The populations of hard X-ray andγ-ray sources: a correlation study and new possible identifications

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