On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part I

Pavlinsky, M.; Tkachenko, A.; Levin, V.; Krivchenko, A.; Rotin, A.; Кузнецова, М. В.; Lapshov, I.; Krivonos, R.; Семена, А. Н.; Semena, N.; Serbinov, D.; Shtykovsky, A. E.; Yaskovich, A.; Олейников, В. Н.; Glushenko, A.; Mereminskiy, I. A.; Molkov, S.; Sazonov, S.; Arefiev, V.

doi:10.1007/s10686-018-9582-5

Cited by 17 publications

(9 citation statements)

References 10 publications

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“…The ART-XC telescope system is composed of seven separate mirror module assemblies (MMAs) and detector systems, known as the Unit of Röntgen Detectors (URDs). Each URD is a CdTe detector with two perpendicular arrays of 48 Au/Pt electrode strips, resulting in a total of 48 × 48 = 2, 304 detector "pixels" (Pavlinsky et al 2018a) with an angular size of ∼ 45 . Laboratory tests of the MMA's with high resolution CCD's have measured the on-axis half-power diameter (HPD) for each MMA to be ∼ 30 − 40 (Pavlinsky et al 2021b), a value that is further degraded when convolved with the larger pixel size of the flight URD's.…”

Section: Telescope Summarymentioning

confidence: 99%

A Probabilistic Method of Background Removal for High Energy Astrophysics Data

Castellano¹,

Chen²,

Swartz³

et al. 2022

Preprint

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We present a new statistical method for constructing background subtracted measurements from event list data gathered by X-ray and gamma ray observatories. This method was initially developed specifically to construct images that account for the high background fraction and low overall count rates observed in survey data from the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum Röntgen Gamma (SRG) mission, although the mathematical underpinnings are valid for data taken with other imaging missions and analysis applications. This method fully accounts for the expected Poisson fluctuations in both the sky photon and non X-ray background count rates in a manner that does not result in unphysical negative counts. We derive the formulae for arbitrary confidence intervals for the source counts and show that our new measurement converges exactly to the standard background subtraction calculation in the high signal limit. Utilizing these results, we discuss several variants of images designed to optimize different science goals for both pointed and slewing telescopes. Using realistic simulated data of a galaxy cluster as observed by ART-XC we show that our method provides a more significant and robust detection of the cluster emission as compared to a standard background subtraction. We also demonstrate its advantages using real observations of a point source from the ART-XC telescope. These calculations may have widespread applications for a number of source classes observed with high energy telescopes.

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Section: Telescope Summarymentioning

confidence: 99%

A Probabilistic Method of Background Removal for High Energy Astrophysics Data

Castellano¹,

Chen²,

Swartz³

et al. 2022

Preprint

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show abstract

“…The Spectrum-Roentgen-Gamma (SRG, [1]) is a Russian X-ray observatory created with participation of Germany, launched in July, 2019 and designed to produce deep X-ray map of the Universe in a wide, 0.2-30 keV, energy range. Its scientific payload consists of two Xray telescopes -ART-XC [2][3][4][5] and eROSITA [7,8], build in Russia and Germany respectively. A map of the large scale structure of the Universe including more than a hundred thousand clusters of galaxies will be outlined.…”

Section: Srg X-ray Telescopesmentioning

confidence: 99%

“…We also assume that the sterile neutrino DM decay flux is detected in a bandwidth equal to the energy resolution FMHM of the corresponding telescope, which are taken from [8] for SRG/eROSITA and from [3] for SRG/ART-XC and are summarized in Table I.…”

Section: Srg X-ray Telescopesmentioning

confidence: 99%

“…The energy resolution of eROSITA telescope remains almost constant, 2.3%, over the entire observation energy range [8]. The energy dependence of ART-XC telescope energy resolution is taken from [3]. The region in blue is excluded from X-ray telescopes and cosmology assuming the resonant mechanism responsible for the sterile neutrino production in the early Universe.…”

Section: Expected Constraints On the Dark Matter Decay Fluxmentioning

confidence: 99%

“…The recently launched Spectrum-Roentgen-Gamma space observatory (Spektr-RG or SRG, [1]), carrying two X-ray telescopes on board, ART-XC [2][3][4][5][6] and eROSITA [7,8], is expected to contribute considerably to cosmology by investigating cosmic large scale structure properties associated with galaxy clusters [7][8][9][10], providing a major improvement in cosmological constraints as compared to the results from earlier X-ray, Sunyaev-Zeldovich and optical galaxy cluster surveys, e.g., [11][12][13]. While these studies can further refine the parameters of Standard Cosmological Model (presently, ΛCDM), the SRG has also high potential in testing specific particle physics models of dark energy and dark matter.…”

Section: Introductionmentioning

confidence: 99%

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