X-Ray Telescopes

Reid, P. B.

doi:10.1888/0333750888/1970

Cited by 2 publications

(5 citation statements)

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“…As the off-axis angle increases, the PSF shape morphs from being circularly symmetric to ellipsoidal and finally bow-tie shaped. There have been a number of attempts to characterise the XMM PSF including: simulations based on measurements of the shape of the mirrors (Gondoin et al 1996); measurements taken on the ground by passing X-ray beams from synchrotron sources through XMM mirror modules (Stockman et al 1997;Gondoin et al 1998); and fitting 1dimensional profiles to observations of bright X-ray sources (Gondoin et al 2000;Ghizzardi 2001Ghizzardi , 2002Read 2004). Unfortunately, thus far, this has not resulted in a complete and reliable characterisation of the XMM PSF.…”

Section: Xmm-newton Point-spread Functionmentioning

confidence: 99%

The XMM Cluster Survey: X-ray analysis methodology

Lloyd-Davies¹,

Romer²,

Mehrtens³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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The XMM Cluster Survey (XCS) is a serendipitous search for galaxy clusters using all publicly available data in the XMM-Newton Science Archive. Its main aims are to measure cosmological parameters and trace the evolution of X-ray scaling relations. In this paper we describe the data processing methodology applied to the 5776 XMM observations used to construct the current XCS source catalogue. A total of 3675 > 4σ cluster candidates with >50 background-subtracted X-ray counts are extracted from a total non-overlapping area suitable for cluster searching of 410 deg2. Of these, 993 candidates are detected with >300 background-subtracted X-ray photon counts, and we demonstrate that robust temperature measurements can be obtained down to this count limit. We describe in detail the automated pipelines used to perform the spectral and surface brightness fitting for these candidates, as well as to estimate redshifts from the X-ray data alone. A total of 587 (122) X-ray temperatures to a typical accuracy of <40 (<10) per cent have been measured to date. We also present the methodology adopted for determining the selection function of the survey, and show that the extended source detection algorithm is robust to a range of cluster morphologies by inserting mock clusters derived from hydrodynamical simulations into real XMMimages. These tests show that the simple isothermal β-profiles is sufficient to capture the essential details of the cluster population detected in the archival XMM observations. The redshift follow-up of the XCS cluster sample is presented in a companion paper, together with a first data release of 503 optically confirmed clusters

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Section: Xmm-newton Point-spread Functionmentioning

confidence: 99%

The XMM Cluster Survey: X-ray analysis methodology

Lloyd-Davies¹,

Romer²,

Mehrtens³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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“…The focal length was kept fixed at z 0 = 3500 mm to maximize the throw of the spectrometer and achieve the highest possible dispersion. This focal length is in keeping with the maximum experimental 5 However, this is not a hard boundary on achievable groove density for future missions. Groove periods as small as 100 nm have been successfully demonstrated for in-plane gratings using a method similar to the proposed EBL direct write method discussed in Chapter 3 [59].…”

Section: Calculated Ogre Configuration and Performancesupporting

confidence: 55%

“…First, the index of refraction for most materials at X-ray wavelengths is just under unity. The property of most materials rules out the use of traditional refractive optical systems without the use of multilayer coatings [5].…”

Section: Soft X-ray Spectrometersmentioning

confidence: 99%

“…5 gives several examples of the large scale patterning defects which can result from the T-NIL imprinting process. These patterning defects yield inefficiently diffracting areas, and impact a grating spectrometer's total effective area.…”

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confidence: 99%

“…Namely, R. Petit, M. Cadilhac, and D. Maystre, and M. Neviere. A reference covering a good deal of their work (in English, no less) is the book Electromagnetic Theory of Gratings, edited by Petit[24] 5. Note that in this section, the notation for exponential function e x is adapted to exp[x].…”

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confidence: 99%

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Fabrication and testing of off-plane gratings for future X-ray spectroscopy missions

DeRoo¹

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Though it has my name on it, this dissertation is the product of many people's hard work and dedication. First, I would like to thank my wife, Mackenzie DeRoo, who has sustained me both personally and professionally and has (somehow) always found interest in X-ray instrumentation. Through her consistent support of my 'need to work,' she is a co-author in absentia. I am grateful to my parents, who were my first co-investigators and copy editors, and who have always actively encouraged my academic pursuits. Next, my colleagues deserve a great deal of credit for their prodigious help. I'd like to thank Drew Miles, Ben Donovan, and Tom Peterson-they have been excellent students, even better teachers, and have enabled a great deal more of this work than I think they realize. I am grateful to Hannah Marlowe, my grating theory buddy, for sharing your knowledge of Python, L A T E X, and diffraction efficiency modeling. I'd like to thank Ted Schultz for his patience in instruction and willingness to impart engineering wisdom, as his advice on how to do something is rarely off the mark. I owe James Tutt the entirety of my knowledge of CCD detectors, and am grateful to him for his persistent willingness to help. His work ethic, loyalty, and dedication are professional characteristics I will strive to emulate in the future. Finally, I owe a great deal to my advisor, Randall McEntaffer. Obviously, he has enabled the subject matter of this work, which has made for an interesting graduate career ('Thanks, boss!'). More importantly, however, he has empowered me as a young scientist, bringing me from pupil to colleague long before I thought I was ready and, in so doing, made me one. Whether X-ray testing a new grating or singing Pitbull &

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X-Ray Telescopes

Cited by 2 publications

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The XMM Cluster Survey: X-ray analysis methodology

The XMM Cluster Survey: X-ray analysis methodology

Fabrication and testing of off-plane gratings for future X-ray spectroscopy missions

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