The X-Ray Surveyor mission concept study: forging the path to NASA astrophysics 2020 decadal survey prioritization

Gaskin, Jessica A.; Özel, Feryal; Vikhlinin, A.

doi:10.1117/12.2240459

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…A far more complete understanding of the dynamics of the hot CGM requires not just sensitivity to detect baryons out to R200, but the velocity resolution to observe the hydrodynamics in the inner CGM. Thus, Xray mission concepts, especially NASA's Lynx large strategic mission concept (Gaskin et al 2016), should consider how to resolve the velocity structure within 0.3R200 in a survey of Milky Way-like haloes.…”

Section: Observatoriesmentioning

confidence: 99%

Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows

Oppenheimer¹

2018

Monthly Notices of the Royal Astronomical Society

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Hydrostatic equilibrium (HSE), where the thermal pressure gradient balances the force of gravity, is tested across a range of simulated EAGLE haloes from Milky Way L * haloes (M 200 ≈ 10 12 M ) to cluster scales. Clusters (M 200 10 14 M ) reproduce previous results with thermal pressure responsible for ∼ 90% of the support against gravity, but this fraction drops for group-sized haloes (M 200 ≈ 10 13 M ) and is even lower (40 − 70%) for L * haloes between 0.1 − 0.3R 200 . Energy from feedback grows relative to the binding energy of a halo toward lower mass resulting in greater deviations from HSE. Tangential motions comprise the largest deviation from HSE in L * haloes indicating that the hot circumgalactic medium (CGM) has significant subcentrifugal rotation and angular momentum spin parameters 2 − 3× higher than the dark matter spin parameters. Thermal feedback can buoyantly rise to the outer CGM of M 200 10 12 M haloes, both moving baryons beyond R 200 and feeding uncorrelated tangential motions. The resulting hot halo density and rotation profiles show promising agreement with X-ray observations of the inner Milky Way halo, and we discuss future observational prospects to detect spinning hot haloes around other galaxies. Acceleration and radial streaming motions also comprise significant deviations from HSE, especially net outward accelerations seen in L * and group haloes indicating active feedback. Black hole feedback acts in a preventative manner during the later growth of group haloes, applying significant accelerations via shocks that do not feed tangential motions. We argue that HSE is a poor assumption for the CGM, especially in the inner regions, and rotating baryonic hot haloes are a critical consideration for analytic models of the CGM.

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Section: Observatoriesmentioning

confidence: 99%

Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows

Oppenheimer¹

2018

Monthly Notices of the Royal Astronomical Society

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“…Even if one acquires such a skill, the number of spectra will increase by a few orders of magnitude over the next decades -Athena will have ∼4000 pixels of TES (Transition E-mail: ichinohe@tmu.ac.jp Edge Sensor) calorimeters (Nandra et al 2013), and further future calorimeter missions such as Lynx (Gaskin et al 2016) and DIOS (Yamada et al 2016) propose a few tens of thousands of pixels. Therefore, data preprocessing will be an essential step in mining large amounts of data in future, and thus developing an automatic way to find appropriate initial parameters is necessary to accommodate a growing number of pixels of the microcalorimeters.…”

Section: Introductionmentioning

confidence: 99%

Neural network-based preprocessing to estimate the parameters of the X-ray emission of a single-temperature thermal plasma

Ichinohe

Yamada

Miyazaki

2018

Monthly Notices of the Royal Astronomical Society

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We present data preprocessing based on an artificial neural network to estimate the parameters of the X-ray emission spectra of a single-temperature thermal plasma. The method finds appropriate parameters close to the global optimum. The neural network is designed to learn the parameters of the thermal plasma (temperature, abundance, normalisation, and redshift) of the input spectra. After training using 9000 simulated X-ray spectra, the network has grown to predict all the unknown parameters with uncertainties of about a few percent. The performance dependence on the network structure has been studied. We applied the neural network to an actual high-resolution spectrum obtained with Hitomi. The predicted plasma parameters agreed with the known best-fit parameters of the Perseus cluster within 10% uncertainties. The result shows a possibility that neural networks trained by simulated data can be useful to extract a feature built in the data, which would reduce human-intensive preprocessing costs before detailed spectral analysis, and help us make the best use of large quantities of spectral data coming in the next decades.

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“…The Lynx (formerly X-ray Surveyor) mission concept, currently under study for submission to the 2020 Astrophysics Decadal Survey, is expected to conclude that Chandra-like sub-arc second angular resolution is required to meet future science goals 2 . This is consistent with 2013's "Enduring Quests, Daring Visions" astrophysics roadmap 3 and the 2016 PCOS Technology Report 4 that specifies high-resolution lightweight X-ray optics as a key enabling technology critical to progress on the highest-priority strategic astrophysics missions.…”

Section: Introductionmentioning

confidence: 99%

Improving x-ray optics via differential deposition

Kilaru

Kolodziejczak

Atkins

2017

Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII

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Differential deposition, a post-fabrication figure correction technique, has the potential to significantly improve the imaging quality of grazing-incidence X-ray optics. DC magnetron sputtering is used to selectively coat the mirror in order to minimize the figure deviations. Custom vacuum chambers have been developed at NASA MSFC that will enable the implementation of the deposition on X-ray optics. A factor of two improvement has been achieved in the angular resolution of the full-shell X-ray optics with first stage correction of differential deposition. Current efforts are focused on achieving higher improvements through efficient implementation of differential deposition.

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The X-Ray Surveyor mission concept study: forging the path to NASA astrophysics 2020 decadal survey prioritization

Cited by 8 publications

References 12 publications

Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows

Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows

Neural network-based preprocessing to estimate the parameters of the X-ray emission of a single-temperature thermal plasma

Improving x-ray optics via differential deposition

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