The AGILE monitoring of Cygnus X-3: transient gamma-ray emission and spectral constraints

Piano, G.; Tavani, M.; Vittorini, V.; Trois, A.; Giuliani, A.; Bulgarelli, A.; Evangelista, Y.; Coppi, P.; Monte, E. Del; Sabatini, S.; Striani, E.; Donnarumma, I.; Hannikainen, Diana; Koljonen, K. I. I.; McCollough, Michael L.; Pooley, G. G.; Трушкин, С. А.; Zanin, R.; Barbiellini, G.; Cardillo, M.; Cattaneo, P. W.; Chen, Andrew; Colafrancesco, S.; Feroci, M.; Fuschino, F.; Giusti, M.; Longo, F.; Morselli, A.; Pellizzoni, A.; Pittori, C.; Pucella, G.; Rapisarda, M.; Rappoldi, A.; Soffitta, P.; Trifoglio, M.; Vercellone, S.; Verrecchia, F.

doi:10.1051/0004-6361/201219145

Cited by 41 publications

(54 citation statements)

References 58 publications

(117 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…11 the 1AGLR J2033+4057/ Cyg X-3 light curve together with the 15−150 keV daily light curve from Swift/BAT (Barthelmy et al 2005). This plot is similar to those reported in Tavani et al (2009c), Bulgarelli et al (2012a), and Piano et al (2012). Here we show the 1−2-day γ-ray flare times in the Pointing mode interval described there.…”

Section: Long-term Light Curves Of Some Prominent Sourcessupporting

confidence: 92%

“…The first AGILE catalogue ) was built using data collected during the first year of operations (July 2007-June 2008, which includes half of cycle-1 of the AGILE GO (Tavani et al 2009b(Tavani et al , 2009cSabatini et al 2010;Giuliani et al 2010;Bulgarelli et al 2012a;Piano et al 2012).…”

Section: Revision Of the First Agile-grid Catalogue Based On The 23 mentioning

confidence: 99%

“…Our detections correspond to the reported activity periods, and moreover a flux UL at √ T S = 2.7 (MJD = 54 591.5) is compatible with a short dip in the BAT hard X-ray light curve. We performed an additional ML analysis on a three-day time scale that found an additional low-significance ( √ T S = 4) short time scale γ-ray emission enhancement not included in Piano et al (2012), which in fact reported the γ-ray activity on the 1−2-day time scale. Again our flux variations are averaged on longer time intervals, so that this source is only classified as uncertain in this analysis.…”

Section: Long-term Light Curves Of Some Prominent Sourcesmentioning

confidence: 99%

See 2 more Smart Citations

An updated list of AGILE brightγ-ray sources and their variability in pointing mode

Verrecchia

Pittori

Chen

et al. 2013

A&A

Self Cite

View full text Add to dashboard Cite

Aims. We present a variability study of a sample of bright γ-ray (30 Mev−50 Gev) sources. This sample is an extension of the first AGILE catalogue of γ-ray sources (1AGL), obtained using the complete set of AGILE observations in pointing mode performed during a 2.3 year period from July 9, 2007 until October 30, 2009. Methods. The dataset of AGILE pointed observations covers a long time interval and its γ-ray data archive is useful for monitoring studies of medium-to-high brightness γ-ray sources. In the analysis reported here, we used data obtained with an improved event filter that covers a wider field of view, on a much larger (about 27.5 months) dataset, integrating data on observation block time scales, which mostly range from a few days to thirty days. Results. The data processing resulted in a better characterized source list than 1AGL was, and includes 54 sources, 7 of which are new high galactic latitude (|BII| ≥ 5) sources, 8 are new sources on the galactic plane, and 20 sources from the previous catalogue with revised positions. Eight 1AGL sources (2 high-latitude and 6 on the galactic plane) were not detected in the final processing either because of low OB exposure and/or due to their position in complex galactic regions. We report the results in a catalogue of all the detections obtained in each single OB, including the variability results for each of these sources. In particular, we found that 12 sources out of 42 or 11 out of 53 are variable, depending on the variability index used, where 42 and 53 are the number of sources for which these indices could be calculated. Seven of the 11 variable sources are blazars, the others are Crab pulsar+nebula, LS I +61 • 303, Cyg X-3, and 1AGLR J2021+4030.

show abstract

Section: Long-term Light Curves Of Some Prominent Sourcessupporting

confidence: 92%

Section: Revision Of the First Agile-grid Catalogue Based On The 23 mentioning

confidence: 99%

Section: Long-term Light Curves Of Some Prominent Sourcesmentioning

confidence: 99%

See 1 more Smart Citation

An updated list of AGILE brightγ-ray sources and their variability in pointing mode

Verrecchia

Pittori

Chen

et al. 2013

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…So far, the only microquasar (i.e. XRB displaying relativistic jets) firmly detected at high energies (> 100 MeV) is Cygnus X-3 (Tavani et al 2009;Fermi LAT Collaboration et al 2009) and its gamma-ray emission is related to the formation/existence of the radio jets (Piano et al 2012;Corbel et al 2012). However Malyshev et al (2013) showed there is a 4σ-level evidence of gamma-ray signal for Cygnus X-1, above 100 MeV, in 3.8 yr of Fermi-LAT data, only when the source is in the HS.…”

Section: Introductionmentioning

confidence: 99%

Gamma rays detected from Cygnus X-1 with likely jet origin

Zanin

Fernández-Barral

Wilhelmi

et al. 2016

A&A

Self Cite

View full text Add to dashboard Cite

Aims. Probe the high-energy (>60 MeV) emission from the black hole X-ray binary system, Cygnus X-1, and investigate its origin. Methods. We analysed 7.5 yr of data by Fermi-LAT with the latest Pass 8 software version. Results. We report the detection of a signal at ∼8 σ statistical significance spatially coincident with Cygnus X-1 and a luminosity above 60 MeV of 5.5×10 33 erg s −1 . The signal is correlated with the hard X-ray flux: the source is observed at high energies only during the hard X-ray spectral state, when the source is known to display persistent, relativistic radio emitting jets. The energy spectrum, extending up to ∼20 GeV without any sign of spectral break, is well fitted by a power-law function with a photon index of 2.3±0.2. There is a hint of orbital flux variability, with high-energy emission mostly coming around the superior conjunction. Conclusions. We detected GeV emission from Cygnus X-1 and probed that the emission is most likely associated with the relativistic jets. The evidence of flux orbital variability points to the anisotropic inverse Compton on stellar photons as the mechanism at work, thus constraining the emission region to a distance 10 11 − 10 13 cm from the black hole.

show abstract

“…7.8), PSR J2032+4127 (2AGL J2032+4135). Furthermore, three microquasars were detected in this region with variable γ-ray emission: Cygnus X-1 (Sabatini et al 2010(Sabatini et al , 2013, Cygnus X-3 (2AGL J2033+4060, Tavani et al 2009b;Abdo et al 2009c;Bulgarelli et al 2012b;Piano et al 2012), V404 Cygni (Piano et al 2017). Cygnus X-1 and V404 Cygni are not part of this Catalog.…”

Section: The Cygnus Regionmentioning

confidence: 99%

Second AGILE catalogue of gamma-ray sources

Bulgarelli

Fioretti

Parmiggiani

et al. 2019

A&A

Self Cite

View full text Add to dashboard Cite

Aims. We present the second AGILE-GRID Catalog (2AGL) of γ-ray sources in the 100 MeV -10 GeV energy range. Methods. With respect to previous AGILE-GRID catalogs, the current 2AGL Catalog is based on the first 2.3 years of science data from the AGILE mission (the so called 'pointing mode') and incorporates more data and several analysis improvements, including better calibrations at the event reconstruction level, an updated model for the Galactic diffuse γ-ray emission, a refined procedure for point-like source detection, and the inclusion of a search for extended γ-ray sources.Results. The 2AGL Catalog includes 175 high-confidence sources (above 4σ significance) with their location regions and spectral properties, and a variability analysis with 4-day light curves for the most significant ones. Relying on the error region of each source position, including systematic uncertainties, 121 sources are considered as positionally associated with known couterparts at different wavelengths or detected by other γ-ray instruments. Among the identified or associated sources, 62 are Active Galactic Nuclei (AGNs) of the blazar class. Pulsars represent the largest Galactic source class, with 40 associated pulsars, 7 of them with detected pulsation; 8 Supernova Remnants and 4 high-mass X-ray binaries have also been identified. A substantial number of 2AGL sources are unidentified: for 54 sources no known counterpart is found at different wavelengths. Among these sources, we discuss a sub-class of 29 AGILE-GRID-only γ-ray sources that are not present in 1FGL, 2FGL or 3FGL catalogs; the remaining sources are unidentified in both 2AGL and 3FGL Catalogs. We also present an extension of the analysis of 2AGL sources detected in the 50 -100 MeV energy range.

show abstract

The AGILE monitoring of Cygnus X-3: transient gamma-ray emission and spectral constraints

Cited by 41 publications

References 58 publications

An updated list of AGILE brightγ-ray sources and their variability in pointing mode

An updated list of AGILE brightγ-ray sources and their variability in pointing mode

Gamma rays detected from Cygnus X-1 with likely jet origin

Second AGILE catalogue of gamma-ray sources

Contact Info

Product

Resources

About