MVN experiment – All sky monitor for measuring cosmic X-ray background of the universe onboard the ISS

Serbinov, D.; Pavlinsky, M.; Semena, A.; Semena, N.; Lutovinov, A.; Molkov, S.; Buntov, M.; Arefiev, V.; Lapshov, I.

doi:10.1007/s10686-021-09699-8

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…The MVN mission employ CdTe crystal of 32 pixels (1 mm thickness) [7]. It has excellent energy response at low energies, but this setup starts to be transparent when energy is higher than ∼70 keV.…”

Section: Cebr 3 Crystalmentioning

confidence: 99%

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Measuring the Cosmic X-ray Background accurately

Li¹,

Produit²,

Walter³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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We propose a detector that attempts to measure the diffuse Cosmic X-ray Background (CXB) in the 10-100 keV energy band with unprecedented precision, so as to: 1). help to understand the source population of the CXB, most of which are proposed to be Active Galactic Nuclei (AGNs); 2). study the anisotropy of the CXB intensity over the sky, which helps to understand the largescale structure of the Universe. An obstacle of the above studies is the difficulty of measuring the absolute intensity of the CXB. Detectors working at X-ray bands suffer from time-dependent backgrounds which are difficult to subtract. Our design is similar to the projected MVN (Monitor Vsego Neba) Russian experiment, which mainly consist of four collimated spectrometers with a rotating obturator on top of the aperture. In this paper, we will show the construction ideas, its performance simulations, and some preliminary setup of the prototype, we will also discuss the launch opportunities.

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Section: Cebr 3 Crystalmentioning

confidence: 99%

“…The CXB flux need therefore to be determined with a much better accuracy. In this context, the MVN (Monitor Vsego Neba) instrument was built by the Space Research Institute of the Russian Academy of Sciences [7] but not yet launched. We follow a similar idea for a colimated instrument surveying the sky through a rotating obturator.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Cosmic X-ray Background accurately

Li¹,

Produit²,

Walter³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

show abstract

“…The MVN uses 32 pixels (1 mm thickness) of CdTe crystal [8] as sensitive detector with an excellent energy response at low energy, however it becomes transparent above ∼70 keV. We will use a detector made of CeBr 3 scintillation material and of a SiPM light detector.…”

Section: Cebr 3 Crystal and Sipm Array Detectormentioning

confidence: 99%

“…The CXB flux need therefore to be determined with a much better accuracy. In this context, the MVN (Monitor Vsego Neba) instrument was built by the Space Research Institute of the Russian Academy of Sciences [8] but not yet launched. We follow a similar idea for a collimated instrument surveying the sky through a rotating obturator.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Cosmic X-ray Background accurately

Li,

Produit,

Walter

2021

Preprint

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Measuring the Cosmic X-ray Background (CXB) is a key to understand the Active Galactic Nuclei population, their absorption distribution and their average spectra. However, hard X-ray instruments suffer from time-dependent backgrounds and cross-calibration issues. The uncertainty of the CXB normalization remain of the order of 20%. To obtain a more accurate measurement, the Monitor Vsego Neba (MVN) instrument was built in Russia but not yet launched to the ISS. We follow the same ideas to develop a CXB detector made of four collimated spectrometers with a rotating obturator on top. The collimators block off-axis photons below 100 keV and the obturator modulates on-axis photons allowing to separate the CXB from the instrumental background. Our spectrometers are made of 20 mm thick CeBr 3 crystals on top of a SiPM array. One tube features a ∼20 cm 2 effective area and more energy coverage than MVN, leading to a CXB count rate improved by a factor of ∼10 and a statistical uncertainty ∼0.5% on the CXB flux. A prototype is being built and we are seeking for a launch opportunity.

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“…To measure the CXB accurately, instrumental background modeling, energy and detection efficiency calibration are meticulously required. In this context, the MVN (Monitor Vsego Neba) instrument was proposed by the Space Research Institute of the Russian Academy of Sciences [25]. A cylindrical multi-layer collimator protects an inner spectrometer from receiving off-axis photons up to a certain energy threshold, and a rotating obturator periodically shields the aperture of the collimator to modulate the Field of View (FoV) to discriminate the CXB flux from other components and backgrounds.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Cosmic X-ray Background accurately

Walter

Produit

et al. 2022

Preprint

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Synthesis models of the diffuse Cosmic X-ray Background (CXB) suggest that it can be resolved into discrete sources, primarily Active Galactic Nuclei (AGNs). Measuring the CXB accurately offers a unique probe to study the AGN population in the nearby Universe. Current hard X-ray instruments suffer from time-dependent background and cross-calibration issues. As a result, their measurements of the CXB normalization has an uncertainty of the order of ~15%. In this paper, we present the concept and simulated performances of a CXB detector, which could be operated on different platforms. With a 16-U CubeSat mission running for more than two years in space, such a detector could measure the CXB normalization with ~1% uncertainty.

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MVN experiment – All sky monitor for measuring cosmic X-ray background of the universe onboard the ISS

Cited by 6 publications

References 16 publications

Measuring the Cosmic X-ray Background accurately

Measuring the Cosmic X-ray Background accurately

Measuring the Cosmic X-ray Background accurately

Measuring the Cosmic X-ray Background accurately

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