OMC: An Optical Monitoring Camera for INTEGRAL

Mas-Hesse, J. M.; Giménez, Á.; Culhane, J. L.; Jamar, C.; McBreen, B.; Torra, J.; Hudec, R.; Fabregat, J.; Meurs, E. J. A.; Swings, Jean-Pierre; Alcacera, M. A.; Balado, Ana; Beiztegui, R.; Belenguer, T.; Bradley, L.; Caballero, Manuel Delfín Pérez; Cabo, P.; Defise, Jean-Marc; Dı́az, Eva; Domingo, A.; Figueras, F.; Figueroa, I.; Hanlon, L.; Hroch, Filip; Hudcová, V.; García, T.; Jordan, B.; Jordi, C.; Kretschmar, P.; Laviada, C.; March, M.; Martı́n, E. L.; Mazy, Emmanuel; Menéndez, María del Carmen Rodríguez; Mi, Jie; Miguel, E. de; Muñoz, Tamara; Nolan, Kevin; Olmedo, R.; Plesseria, Jean-Yves; Polcar, J.; Reina, M.; Renotte, Étienne; Rochus, Pierre; Sánchez, Alcides Antúnez; Martin, Jim; Smith, A. W.; Soldán, J.; Thomas, Padmaja B.; Timón, Vicente; Walton, D.

doi:10.1051/0004-6361:20031418

Cited by 140 publications

(31 citation statements)

References 6 publications

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“…IBIS, in turn, is composed of two detector layers, ISGRI operational in the 15-1000 keV range and Pixellated CSi Telescope working in the 0.175-10 MeV range (Labanti et al 2003;Lebrun et al 2003). At lower energies, the payload of INTEGRAL consists of the Joint European X-ray monitor, sensitive to X-rays in the 3-35 keV band (Lund et al 2003) and the optical monitor OMC that covers the visual range 5000-6000Å (Mas-Hesse et al 2003).…”

Section: Integral Observationsmentioning

confidence: 99%

Accreting magnetars: a new type of high-mass X-ray binaries?

Reig

Torrejón

Blay

2012

Monthly Notices of the Royal Astronomical Society

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The discovery of very slow pulsations (Pspin=5560s) has solved the long-standing question of the nature of the compact object in the high-mass X-ray binary 4U 2206+54 but has posed new ones. According to spin evolutionary models in close binary systems, such slow pulsations require a neutron star magnetic field strength larger that the quantum critical value, suggesting the presence of a magnetar. We present the first XMM-Newton observations of 4U 2206+54 and investigate its spin evolution. We find that the observed spin-down rate agrees with the magnetar scenario. We analyse ISGRI/INTEGRAL observations of 4U 2206+54 to search for the previously suggested cyclotron resonance scattering feature at ~30 keV. We do not find a clear indication of the presence of the line, although certain spectra display shallow dips, not always at 30 keV. The association of these dips with a cyclotron line is very dubious because of its apparent transient nature. We also investigate the energy spectrum of 4U 2206+54 in the energy range 0.3-10 keV with unprecedented detail and report for the first time the detection of very weak 6.5 keV fluorescence iron lines. The photoelectric absorption is consistent with the interstellar value, indicating very small amount of local matter, which would explain the weakness of the florescence lines. The lack of matter locally to the source may be the consequence of the relatively large orbital separation of the two components of the binary. The wind would be too tenuous in the vicinity of the neutron star.Comment: accepted for publication in MNRA

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Section: Integral Observationsmentioning

confidence: 99%

Accreting magnetars: a new type of high-mass X-ray binaries?

Reig

Torrejón

Blay

2012

Monthly Notices of the Royal Astronomical Society

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“…We analysed the Optical Monitoring Camera (OMC, equipped with a Johnson V filter; see Mas-Hesse et al 2003) data collected during period A with the OSA software version 8.0. Due to the dithering mode of INTEGRAL observations, the field around the source was observed with OMC in the science windows 2, 50, 52 and 78 of revolution 633, in the science windows 49, 51 and 77 of revolution 635, and in the science windows 49 and 51 of revolution 637.…”

Section: Integral/omc Datamentioning

confidence: 99%

The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods

Pacciani

Donnarumma

Denney

et al. 2012

Monthly Notices of the Royal Astronomical Society

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In 2008, AGILE and Fermi detected gamma-ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar (GB6 J1239+0443) at z = 1.762. The optical counterpart of the gamma-ray source underwent a flux enhancement of a factor of 1530 in six years, and of similar to 10 in six months. We interpret this flare-up in terms of a transition from an accretion-disc-dominated emission to a synchrotron-jet-dominated one. We analysed a Sloan Digital Sky Survey (SDSS) archival optical spectrum taken during a period of low radio and optical activity of the source. We estimated the mass of the central black hole using the width of the C?iv emission line. In our work, we have also investigated SDSS archival optical photometric data and ultraviolet GALEX observations to estimate the thermal disc emission contribution of GB6 J1239+0443. Our analysis of the gamma-ray data taken during the flaring episodes indicates a flat gamma-ray spectrum, with an extension of up to 15?GeV, with no statistically relevant sign of absorption from the broad-line region, suggesting that the blazar zone is located beyond the broad-line region. This result is confirmed by the modelling of the broad-band spectral energy distribution (well constrained by the available multiwavelength data) of the flaring activity periods and by the accretion disc luminosity and black hole mass estimated by us using archival data

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“…Its main instruments are the IBIS (15 keV-10 MeV; Ubertini et al 2003) and the Spectrometer on board INTEGRAL (SPI, 20 keV-8 MeV; Vedrenne et al 2003). These instruments are supplemented by the Joint European X-ray Monitor (JEM-X, 3-35 keV; Lund et al 2003) and the Optical Monitor Camera (OMC, V, 500-600 nm; Mas-Hesse et al 2003). At the lower energies (15 keV-1 MeV), the cadmium telluride array ISGRI (Lebrun et al 2003) of IBIS has a better continuum sensitivity than SPI.…”

Section: O B S E Rvat I O N S a N D Data A Na Ly S I Smentioning

confidence: 99%

Long-term monitoring of LS I +61°303 with INTEGRAL

Zhang¹,

Torres²,

Li³

et al. 2010

Monthly Notices of the Royal Astronomical Society

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LS I +61°303 is one of the few high‐mass X‐ray binaries that has been recently observed at TeV and GeV energies. Here we investigate the hard X‐ray spectral and timing properties of this source using the IBIS/ISGRI instrument on‐board the INTEGRAL satellite. We carry out a systematic analysis based on all available INTEGRAL data since 2002 December 28 up to 2008 April 30. The total exposure time analysed amounts to 2.1 Ms, hence more than double the previous reported sample. The source is best detected in the 18–60 keV band, with a significance level of 12.0σ. The hard X‐ray data are best fitted with a simple power law with a photon index of ∼1.7 ± 0.2. We detect a periodical signal at 27 ± 4 d, matching the orbital period of 26.496 d previously reported at other wavelengths. The hard X‐ray orbital light curve is obtained and compared with those derived at other frequencies.

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OMC: An Optical Monitoring Camera for INTEGRAL

Cited by 140 publications

References 6 publications

Accreting magnetars: a new type of high-mass X-ray binaries?

Accreting magnetars: a new type of high-mass X-ray binaries?

The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods

Long-term monitoring of LS I +61°303 with INTEGRAL

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