Uwe Herbstmeier

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We examined the Fourier power spectrum characteristics of cirrus structures in 13 sky fields with faint to bright cirrus emission observed with ISOPHOT in the 90–200µm wavelength range in order to study variations of the spectral index α. We found that α varies from field to field with –5.3 ≤ α ≤ –2.1. It depends on the absolute surface brightness and on(More)
We present medium and high angular resolution H I and CO observations of the galactic cirrus cloud IVC 135+54?45 and compare the line emission with intensities of the IRAS 100m and 60m bands. Its distance above the galactic plane is about 220 pc, thus well outside the scale height of normal molecular gas (74 pc). Thus IVC 135+54?45 ooers an unique(More)
Four fields with areas ranging from 80 to 2000 arcmin2 have been mapped with the photometer on board of the Infrared Space Observatory (ISO) at 90 and around 180μm in regions of bright and faint cirrus. We examined the spatial characteristics of the infrared background emission with high spatial resolution and found that the fluctuations in the background(More)
We present the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175 μm, and the associated data at U, g, r, i, Z, J, H, K and 20 cm. The origin of the survey, infrared and radio observations, data-reduction and optical identifications are briefly reviewed, and a summary of the area covered and the completeness limit for(More)
The ISOPHOT Serendipity Survey fills the otherwise unused slew time between ISO’s fine pointings with measurements in an unexplored wavelength regime near 200 m. First results of the Serendipity Survey demonstrate its capabilities in the detection of extragalactic point sources as well as in investigations of the galactic infrared cirrus. With the detection(More)
The ISOPHOT Serendipity Survey fills the otherwise unused slew time between ISO’s fine pointings with measurements in an unexplored wavelength regime near 200 μm. In order to test point source extraction software, the completeness of the detected objects as well as the astrophysical content we investigate a 100ut◦ field near the North ecliptic pole, dubbed(More)
The detection by the Roentgen satellite (ROSAT) x-ray telescope of a shadow in the 1/4-kiloelectron volt (C band, 0.1 to 0.284 kiloelectron volt) cosmic diffuse background is reported. The location and morphology of the local minimum in x-rays are in clear agreement with a discrete H I cloud. The shadow is very deep with a minimum level at 50 percent of the(More)
We present medium and high angular resolution H I and CO observations of the galactic cirrus cloud IVC 135+54−45 and compare the line emission with intensities of the IRAS 100μm and 60μm bands. Its distance above the galactic plane is about 220 pc, thus well outside the scale height of normal molecular gas (≈ 74 pc). Thus IVC 135+54−45 offers a unique(More)
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