The Rosat mission

Aschenbach, B.; Bräuninger, H.; Briel, U. G.; Brinkmann, W.; Fink, H. H.; Heinecke, N.; Hippmann, H.; Kettenring, G.; Metzner, G.; Ondrusch, A.; Pfeffermann, E.; Predehl, P.; Reger, G.; Stephan, K. H.; Trümper, J.; Zimmermann, H. U.

doi:10.1007/bf01246075

Cited by 16 publications

(12 citation statements)

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“…About 85,000 GALEX objects were matched, with the false match probability about 1.46 per cent. As an X-ray dataset, we use the Roentgen Satellite (ROSAT; Aschenbach et al 1981) all sky survey data. The information of the ROSAT sources matched with the SDSS objects provided by the SDSS is used, and the number of the ROSAT sources is about 2,200.…”

Section: Additional Multi-wavelength Datasetsmentioning

confidence: 99%

The nature of the Sloan Digital Sky Survey galaxies in various classes based on morphology, colour and spectral features - III. Environments

Lee

Park

et al. 2010

Monthly Notices of the Royal Astronomical Society

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We present a study on the environments of the Sloan Digital Sky Survey (SDSS) galaxies divided into fine classes based on their morphology, colour and spectral features. The SDSS galaxies are classified into early-type and late-type; red and blue; passive, H II, Seyfert and low-ionization nuclear emission-line region (LINER), which returns a total of 16 fine classes of galaxies. We estimate the local number density, target-excluded local luminosity density, local colour, close pair fraction and the luminosity and colour of the brightest neighbour, which are compared between the fine classes comprehensively. The morphology-colour class of galaxies strongly depends on the local density, with the approximate order of high-density preference: red early-type galaxies (REGs); red late-type galaxies (RLGs); blue early-type galaxies (BEGs) and blue late-type galaxies (BLGs). We find that high-density environments (like cluster environments) seem to suppress active galactic nucleus activity. The pair fraction of H II REGs does not show a statistically significant difference from that of passive REGs, while the pair fraction of H II BLGs is smaller than that of non-H II BLGs. H II BLGs show obvious double (red + blue) peaks in the distribution of the brightest neighbour colour, while red galaxies show a single red peak. The brightest neighbours of Seyfert BLGs tend to be blue, while those of LINER BLGs tend to be red, which implies that the difference between Seyfert and LINER may be related to the pair interaction. Other various environments of the fine classes are investigated, and their implications for galaxy evolution are discussed.

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Section: Additional Multi-wavelength Datasetsmentioning

confidence: 99%

The nature of the Sloan Digital Sky Survey galaxies in various classes based on morphology, colour and spectral features - III. Environments

Lee

Park

et al. 2010

Monthly Notices of the Royal Astronomical Society

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“…Descriptions of the instrument can be found in Aschenbach et al 1981, Pfeffermann & Briel 1982, and Aschenbach 1988. We used all observations with a total exposure longer than 10,000 s that were taken before 1991 October 14.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

On the Integrated Spectrum of the X-Ray Binaries and the Origin of Soft X-Ray Emission from the Bulge of M31

Borozdin

Priedhorsky

2000

The Astrophysical Journal

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Using ROSAT PSPC data, we have performed several tests aimed at understanding the origin of the soft X-ray spectral component detected from the bulge of M31. We find that a significant soft component in the spectrum of the bulge is spatially correlated with the unresolved X-ray emission near the core of M31, which is probably a hot interstellar medium or perhaps a population of multiple faint sources. For the first time, we extracted the spectrum of this unresolved emission, by removing point sources dominating the integral spectrum of the bulge, and found it to be responsible for most of the soft excess. A soft spectral component is not at all needed to fit the point-source spectrum that remains after subtracting the unresolved emission. The integral spectra of bright point sources, both inside and outside of the M31 bulge, can be fitted with a single power law in the ROSAT band. Our analysis rules out the previous suggestion that all bulge emission in M31 may be generated by low-mass X-ray binaries (Irwin & Bregman).

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“…30 ESA's EXOSAT -1986Taylor et al 1981) 31 covered the energy range between 0.05 keV and 50 keV. It was followed by the ROSAT mission (Röntgensatellit, 1990(Röntgensatellit, -1999Aschenbach et al 1981), carrying a German-built imaging X-ray Telescope (XRT) with three focal-plane instruments, two Position Sensitive Proportional Counters (PSPC), and the US-supplied High-Resolution Imager (HRI). The X-ray mirror assembly was a grazing-incidence fourfold nested Wolter I telescope with an 84 cm diameter aperture and 240 cm focal length.…”

Section: X-ray Instrumentsmentioning

confidence: 99%

Spectroradiometry with space telescopes

Pauluhn

Huber

Smith

et al. 2015

Astron Astrophys Rev

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Radiometry, i.e. measuring the power of electromagnetic radiationhitherto often referred to as "photometry"-is of fundamental importance in astronomy. We provide an overview of how to achieve a valid laboratory calibration of space telescopes and discuss ways to reliably extend this calibration to the spectroscopic telescope's performance in space. A lot of effort has been, and still is going into radiometric "calibration" of telescopes once they are in space; these methods use celestial primary and transfer standards and are based in part on stellar models. The history of the calibration of the Hubble Space Telescope serves as a platform to review these methods. However, we insist that a true calibration of spectroscopic space telescopes must directly be based on and traceable to laboratory standards, and thus be independent of the observations. This has recently become a well-supported aim, following the discovery of the acceleration of the cosmic expansion by use of type-Ia supernovae, and has led to plans for launching calibration rockets for the visible and infrared spectral range. This is timely, too, because an adequate exploitation of data from present space missions, such as Gaia, and from many current astronomical projects like Euclid and WFIRST demands higher radiometric accuracy than is generally available today. A survey of the calibration of instruments observing from the X-ray to the infrared spectral domains that include instrument-or mission-specific estimates of radiometric accuracies rounds off this review.

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The Rosat mission

Cited by 16 publications

References 0 publications

The nature of the Sloan Digital Sky Survey galaxies in various classes based on morphology, colour and spectral features - III. Environments

The nature of the Sloan Digital Sky Survey galaxies in various classes based on morphology, colour and spectral features - III. Environments

On the Integrated Spectrum of the X-Ray Binaries and the Origin of Soft X-Ray Emission from the Bulge of M31

Spectroradiometry with space telescopes

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