Athena: <scp>ESA</scp>'s X‐ray observatory for the late 2020s

Barcons, X.; Barret, D.; Decourchelle, A.; Herder, J. W. den; Fabian, A. C.; Matsumoto, Hironori; Lumb, D.; Nandra, K.; Piro, L.; Smith, Randall K.; Willingale, R.

doi:10.1002/asna.201713323

Cited by 123 publications

(129 citation statements)

References 6 publications

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“…-Advanced Telescope for High Energy Astrophysics (ATHENA): ∼ 4 × 10 −17 erg cm −2 s −1 in 0.5 − 2 keV band in a 10 6 s deep field (Barcons et al 2012). …”

Section: Energy or Momentum Conserving Outflowmentioning

confidence: 99%

Probing the gaseous halo of galaxies through non-thermal emission from AGN-driven outflows

Wang

Loeb

2015

Mon. Not. R. Astron. Soc.

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Feedback from outflows driven by active galactic nuclei (AGN) can affect the distribution and properties of the gaseous halos of galaxies. We study the hydrodynamics and non-thermal emission from the forward outflow shock produced by an AGN-driven outflow. We consider a few possible profiles for the halo gas density, self-consistently constrained by the halo mass, redshift and the disk baryonic concentration of the galaxy. We show that the outflow velocity levels off at ∼ 10 3 km s −1 within the scale of the galaxy disk. Typically, the outflow can reach the virial radius around the time when the AGN shuts off. We show that the outflows are energy-driven, consistently with observations and recent theoretical findings. The outflow shock lights up the halos of massive galaxies across a broad wavelength range. For Milky Way (MW) mass halos, radio observations by The Jansky Very Large Array (JVLA) and The Square Kilometer Array (SKA) and infrared/optical observations by The James Webb Space Telescope (JWST) and Hubble Space Telescope (HST) can detect the emission signal of angular size ∼ 8 ′′ from galaxies out to redshift z ∼ 5. Millimeter observations by The Atacama Large Millimeter/submillimeter Array (ALMA) are sensitive to non-thermal emission of angular size ∼ 18′′ from galaxies at redshift z 1, while X-ray observations by Chandra, XMM-Newton and The Advanced Telescope for High Energy Astrophysics (ATHENA) is limited to local galaxies (z 0.1) with an emission angular size of ∼ 2 ′ . Overall, the extended non-thermal emission provides a new way of probing the gaseous halos of galaxies at high redshifts.

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“…-Advanced Telescope for High Energy Astrophysics (ATHENA): ∼ 4 × 10 −17 erg cm −2 s −1 in 0.5 − 2 keV band in a 10 6 s deep field (Barcons et al 2012). …”

Section: Energy or Momentum Conserving Outflowmentioning

confidence: 99%

Probing the gaseous halo of galaxies through non-thermal emission from AGN-driven outflows

Wang

Loeb

2015

Mon. Not. R. Astron. Soc.

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“…2, and requiring the signal associated to these deviations to be well above (S /N ∼ 5) the Poisson noise from the disk continuum (which, for isolated point-like sources, dominates the noise), in the same energy range, we can estimate the exposure time require to detect them. With the next generation of large collecting area X-ray satellites like ATHENA (whose expected effective area at 6 keV is 2500 cm 2 , Barcons et al 2017) we predict that deviations in the intensity of the line of the order of few percent could be detected with typical exposure times ranging from 10 5 s in the brightest sources like Sco X-1 e Ser X-1 to a few 10 5 s for weaker ones like 4U1608-52. More interesting is the fact that for large viewing angles, the high-energy edge can move enough to be revealed even with a low spectral resolution.…”

Section: Discussionmentioning

confidence: 94%

Iron line from neutron star accretion discs in scalar tensor theories

Bucciantini

Soldateschi

2020

Monthly Notices of the Royal Astronomical Society: Letters

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The Fe K α fluorescent line at 6.4 keV is a powerful probe of the space-time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely Scalar tensor Theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars, change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disk, where the Fe line originates, and the changes in the light propagation around the neutron star, we computed line shapes for various inclinations of the disk with respect to the observer. We found that both the intensity of the low energy tails and the position of the high energy edge of the line change. Moreover we verified that even if those changes are in general of the order of a few percent, they are potentially observable with the next generation of X-ray satellites.

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“…A similar alignment system [8][9][10] is used on the NuSTAR satellite and it will continue to be required for several upcoming missions [11][12][13] in x-ray astronomy.…”

Section: Discussionmentioning

confidence: 99%

In-flight performance of the Canadian Astro-H Metrology System

Gallo

Koujelev

Gagnon

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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Abstract. The Canadian Astro-H Metrology System (CAMS) on the Hitomi x-ray satellite is a laser alignment system that measures the lateral displacement (X/Y) of the extensible optical bench (EOB) along the optical axis of the hard x-ray telescopes (HXTs). The CAMS consists of two identical units that together can be used to discern translation and rotation of the deployable element along the axis. This paper presents the results of in-flight usage of the CAMS during deployment of the EOB and during two observations (Crab and G21.5-0.9) with the HXTs. The CAMS was extremely important during the deployment operation by providing realtime positioning information of the EOB with micrometer-scale resolution. We show how the CAMS improves data quality coming from the hard x-ray imagers. Moreover, we demonstrate that a metrology system is even more important as the angular resolution of the telescope increases. Such a metrology system will be an indispensable tool for future high-resolution x-ray imaging missions.

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Athena: ESA's X‐ray observatory for the late 2020s

Cited by 123 publications

References 6 publications

Probing the gaseous halo of galaxies through non-thermal emission from AGN-driven outflows

Probing the gaseous halo of galaxies through non-thermal emission from AGN-driven outflows

Iron line from neutron star accretion discs in scalar tensor theories

In-flight performance of the Canadian Astro-H Metrology System

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