The High Energy Astronomy Observatory X-Ray Telescope

Miller, R. S.; Austin, G.; Koch, David; Jagoda, N.; Kirchner, T.; Dias, Ronaldo da Silva

doi:10.1109/tns.1978.4329343

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…Reducing scatter mean achieving a higher surface finish, and it was decided that this could be achieved with glass substrates which could be polished more finely. Experiments with fused silica confirmed that the required surface roughness could be reached [25].…”

Section: Smentioning

confidence: 79%

“…Additional challenges included mounting the optic using materials with adequate rigidity yet low thermal expansion coefficient to avoid distortions in the test, launch and on-orbit operating environments. A special Invar alloy, heat treated to match the Zerodur expansion coefficient, was used for the interface to the mirrors at their ends and a graphite structure, also with matched expansion coefficient, tied the ends together [25].…”

Section: Smentioning

confidence: 99%

“…The alignment system was mounted on a five-axis micro-positioning stage to enable precise placement with respect to its optic pair, measured via optical monitoring. When the required accuracy was achieved the mirror was bonded to its Invar support system via injection of a suitable epoxy [25]. The Einstein mirror assembly (Figure 7) was integrated with the flight instruments and shipped to Marshall Space Flight Center where a special calibration facility had been built.…”

Section: Smentioning

confidence: 99%

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X-Ray Optics for Astrophysics: a historical review

Christensen¹,

Ramsey²

2022

Preprint

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Grazing-incidence X-ray optics have revolutionized X-ray astrophysics. The ability to concentrate flux to a tiny detection region provides a dramatic reduction in background and a consequent very large improvement in sensitivity. The X-ray optics also permit use of small-format, high-performance focal plane detectors and, of course, especially for high-angular-resolution optics, provide a wealth of imaging data from extended sources. This review, follows the use of X-ray optics from the first rocket-borne instruments in the 1960s through to the Observatories flying today and being developed for future use. It also includes a brief overview of the challenges of fabricating X-ray optics and the various technologies that have been used to date.

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Section: Smentioning

confidence: 79%

Section: Smentioning

confidence: 99%

Section: Smentioning

confidence: 99%

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X-Ray Optics for Astrophysics: a historical review

Christensen¹,

Ramsey²

2022

Preprint

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“…Therefore, we checked the X-ray archives whether there is a source located at the position of Fomalhaut b. Only one 1.5 ks EINSTEIN IPC (Miller et al 1978) pointing from the year 1979 and a 6.2 ks PSPC exposure with ROSAT (Trümper 1983) from January 1996 are available in the archive (in addition to a 170 sec exposure from the ROSAT All-Sky-Survey), see Figs. 2 and 3.…”

Section: X-ray Datamentioning

confidence: 99%

The companion candidate near Fomalhaut – a background neutron star?

Neuhäuser¹,

Hohle²,

Ginski³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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The directly detected planetary mass companion candidate close to the young, nearby star Fomalhaut is a subject of intense discussion. While the detection of common proper motion led to the interpretation as Jovian-mass companion, later nondetections in the infrared raised doubts. Recent astrometric measurements indicate a belt crossing or highly eccentric orbit for the object, if a companion, making the planetary interpretation potentially even more problematic. In this study we discuss the possibility of Fomalhaut b being a background object with a high proper motion. By analysing the available photometric and astrometric data of the object, we show that they are fully consistent with a neutron star: Neutron stars are faint, hot (blue), and fast moving. Neutron stars with an effective temperature of the whole surface area being 112,000 K to 126,500 K (with small to negligible extinction) at a distance of roughly 11 pc (best fit) would be consistent with all observables, namely with the photometric detections in the optical, with the upper limits in the infrared and X-rays, as well as with the astrometry (consistent with a distances of 11 pc or more and high proper motion as typical for neutron stars) as well as with non-detection of pulsation (not beamed). We consider the probability of finding an unrelated object or even a neutron star nearby and mostly co-aligned in proper motion with Fomalhaut A and come to the conclusion that this is definitely well possible.

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X-Ray Optics for Astrophysics: A Historical Review

Christensen

Ramsey

2022

Handbook of X-Ray and Gamma-Ray Astrophysics

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The High Energy Astronomy Observatory X-Ray Telescope

Cited by 14 publications

References 10 publications

X-Ray Optics for Astrophysics: a historical review

X-Ray Optics for Astrophysics: a historical review

The companion candidate near Fomalhaut – a background neutron star?

X-Ray Optics for Astrophysics: A Historical Review

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