Estimate of the background and sensitivity of the follow-up X-ray telescope onboard Einstein Probe

Zhang, Juan; Qi, Liqiang; Yang, Yanji; Wang, Juan; Liu, Yuan; Cui, Wei; Zhao, D.X.; Jia, S. M.; Li, Tianming; Chen, Tianxiang; Li, Gang; Zhao, Xiaofan; Chen, Yong; Liu, Huaqiu; Bao, Congying; Guan, J.; Song, Liming; Yuan, Weimin

doi:10.1016/j.astropartphys.2021.102668

Cited by 18 publications

(9 citation statements)

References 37 publications

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“…The WXT employs the lobster-eye micropore optics; the sensitivity is 0.26 ×10 −10 erg s −1 cm −2 for 1000 s exposure (Yuan et al 2022). A Wolter-I nested telescope is adopted by the FXT, and the sensitivity of FXT can achieve the order of 10 −14 erg s −1 cm −2 with a 25 minute exposure (Zhang et al 2022). The EP is an ideal instrument to systematically search and study TDEs.…”

Section: Detectability Of At2022cmc-like Events With the Einstein Probementioning

confidence: 99%

AT2022cmc: A Tidal Disruption Event with a Two-component Jet in a Bondi-profile Circumnuclear Medium

Zhou,

Zhu,

Lei

et al. 2024

ApJ

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A supermassive black hole can launch a relativistic jet when it violently disrupts a star that passes too close. Such jetted tidal disruption events (TDEs) are rare and unique tools to investigate quiescent supermassive black holes, jet physics, and circumnuclear environments at high redshift. The newly discovered TDE AT2022cmc (z ∼ 1.193), providing rich multiband (X-ray, UV, optical, submillimeter, and radio) data, has been interpreted as the fourth on-axis jetted TDE. In this work, we constrain the circumnuclear medium (CNM) density profile with both a closure relation test and detailed forward shock model fit with a Markov Chain Monte Carlo approach to the multiband (optical, submillimeter, and radio) data of AT2022cmc. We find that the CNM density profile of AT2022cmc is n ∝ R −k with k ∼ 1.68, implying a Bondi accretion in history. Furthermore, our model fit result suggests a two-component jet in AT2022cmc, indicating similar jet physics to well-studied jetted TDE Sw J1644+57.

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Section: Detectability Of At2022cmc-like Events With the Einstein Probementioning

confidence: 99%

AT2022cmc: A Tidal Disruption Event with a Two-component Jet in a Bondi-profile Circumnuclear Medium

Zhou,

Zhu,

Lei

et al. 2024

ApJ

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“…The sensitivity of CATCH-1 is presented in Figure 14. For comparison, the sensitivities of the type-B satellites of CATCH [37], EP/WXT [9], EP/FXT [10], SVOM/MXT [13] and SWIFT/XRT [38] are also plotted on the same figure. CATCH-1 has better sensitivity when compared to EP/WXT, which also uses the lobster eye telescope.…”

Section: Sensitivitymentioning

confidence: 99%

Simulation Studies for the First Pathfinder of the CATCH Space Mission

Huang,

Zhang,

Tao

et al. 2023

Preprint

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The Chasing All Transients Constellation Hunters (CATCH) space mission is an intelligent constellation consisting of 126 micro-satellites in three types (A, B, and C), designed for X-ray observation with the objective of studying the dynamic universe. Currently, we are actively developing the first Pathfinder (CATCH-1) for the CATCH mission, specifically for type-A satellites. CATCH-1 is equipped with Micro Pore Optics (MPO) and a 4-pixel Silicon Drift Detector (SDD) array. To assess its scientific performance, including the effective area of the optical system, on-orbit background, and telescope sensitivity, we employ the Monte Carlo software Geant4 for simulation in this study. The MPO optics exhibit an effective area of 41 cm^2 at the focal spot for 1 keV X-rays, while the entire telescope system achieves an effective area of 29 cm^2 at 1 keV when taking into account the SDD detector’s detection efficiency. The primary contribution to the background is found to be from the Cosmic X-ray Background. Assuming a 625 km orbit with an inclination of 29◦, the total background for CATCH-1 is estimated to be 8.08 × 10^−2 counts s−1 in the energy range of 0.5–4 keV. Based on the background within the central detector and assuming a Crab-like source spectrum, the estimated ideal sensitivity could achieve 1.9 × 10^−12 erg cm−2 s−1 for an exposure of 10^4 s in the energy band of 0.5–4 keV. Furthermore, after simulating the background caused by low-energy charged particles near the geomagnetic equator, we have determined that there is no need to install a magnetic deflector.

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“…We estimated the primary particle background spectra, based on the works by [90] and [91], for an orbit at a typical altitude of 500 km and inclination of 42 • . The majority of the primary CRs are protons with a spectrum that can be approximated by a power-law [92,93].…”

Section: Cosmic Raysmentioning

confidence: 99%

“…Fig.8Input spectra of different background components for the Geant4 simulation, ranging from 10 −2 to 10 5 MeV. The data points are obtained from[90],[91] and references there in.…”

mentioning

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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Estimate of the background and sensitivity of the follow-up X-ray telescope onboard Einstein Probe

Cited by 18 publications

References 37 publications

AT2022cmc: A Tidal Disruption Event with a Two-component Jet in a Bondi-profile Circumnuclear Medium

AT2022cmc: A Tidal Disruption Event with a Two-component Jet in a Bondi-profile Circumnuclear Medium

Simulation Studies for the First Pathfinder of the CATCH Space Mission

Measuring the Cosmic X-ray Background accurately

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