The Hopkins Ultraviolet Telescope - Performance and calibration during the Astro-1 mission

Davidsen, A. F.; Long, Knox S.; Durrance, S. T.; Blair, William P.; Bowers, Charles W.; Conard, Steven J.; Feldman, P. D.; Ferguson, Henry C.; Fountain, Glen H.; Kimble, Randy A.; Kriss, G. A.; Moos, H. W.; Potocki, K.

doi:10.1086/171424

Cited by 102 publications

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“…Ultraviolet observations made with the Hopkins Ultraviolet Telescope (Davidsen 1992) and Far Ultraviolet Spectroscopic Explorer (FUSE; Moos et al 2000) were presented in Raymond et al (2003). The UV line intensity ratios helped confirm the post-shock electron temperature, and analysis of the O vi doublet led to an estimate of the pre-shock density of 0.2-0.5 cm −3 and a depth of the emitting region along the line of sight of 0.7-1.5 pc.…”

Section: Previous Observations Of the Non-radiative Filamentmentioning

confidence: 99%

Dust Destruction in a Non-Radiative Shock in the Cygnus Loop Supernova Remnant

Sankrit

Williams

Borkowski

et al. 2010

ApJ

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We present 24 μm and 70 μm images of a non-radiative shock in the Cygnus Loop supernova remnant, obtained with the Multiband Imaging Photometer for Spitzer on board the Spitzer Space Telescope. The post-shock region is resolved in these images. The ratio of the 70 μm to the 24 μm flux rises from about 14 at a distance 0. 1 behind the shock front to about 22 in a zone 0. 75 further downstream, as grains are destroyed in the hot plasma. Models of dust emission and destruction using post-shock electron temperatures between 0.15 keV and 0.30 keV and post-shock densities, n H ∼ 2.0 cm −3 , predict flux ratios that match the observations. Non-thermal sputtering (i.e., sputtering due to bulk motion of the grains relative to the gas) contributes significantly to the dust destruction under these shock conditions. From the model calculations, we infer that about 35% by mass of the grains are destroyed over a 0.14 pc region behind the shock front.

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Section: Previous Observations Of the Non-radiative Filamentmentioning

confidence: 99%

Dust Destruction in a Non-Radiative Shock in the Cygnus Loop Supernova Remnant

Sankrit

Williams

Borkowski

et al. 2010

ApJ

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“…4). A description of the HUT instrument and data reduction can be found in Davidsen et al (1992). The spectrum was acquired from the Multimission Archive at the Space Telescope Science Institute (MAST ).…”

Section: Description Of the Hut Observationmentioning

confidence: 99%

Fluorescent Molecular Hydrogen Emission in IC 63:FUSE, Hopkins Ultraviolet Telescope, and Rocket Observations

Andersson

McCandliss

Feldman

2005

ApJ

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We present far-ultraviolet observations of IC 63, an emission/reflection nebula illuminated by the B0.5 IV star Cas, located 1.3 pc from the nebula. Molecular hydrogen fluorescence was detected first in IC 63 by IUE and later at shorter wavelengths by ORFEUS. Here we present Far Ultraviolet Spectroscopic Explorer (FUSE ) observations toward three locations in the nebula, complemented by Hopkins Ultraviolet Telescope (HUT) data on the central nebular position. In addition, we present a sounding rocket calibration of a FUSE spectrum of Cas. Molecular hydrogen fluorescence is detected in all three FUSE pointings. The intensity of this emission, as well as the contributions from other species, are seen to vary with position. The absolute flux calibration of the sounding rocket data allows us to reliably predict the radiation field incident on IC 63. We use these data to test models of the fluorescent process. Our modeling resolves the perceived discrepancy between the existing ultraviolet observations and achieves a satisfactory agreement with the H 2 rotational structure observed with FUSE.

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“…The Astro-1 mission (STS-35) occurred in 1990 December, and the Astro-2 mission (STS-67) was flown in 1995 March. The characteristics of HUT are described by Davidsen et al (1992) and the details of the instrumental calibration are described by Kruk et al (1995Kruk et al ( , 1999. Briefly, HUT was a 0.9 m telescope that fed an f/2 beam to a prime focus spectrograph with a microchannel-plate image intensifier and a photon-counting Reticon diode array detector.…”

Section: Hut Spectramentioning

confidence: 99%

Far Ultraviolet Spectroscopic Explorer and Hopkins Ultraviolet Telescope Observations of Radiative Shocks in the Cygnus Loop

Blair

Sankrit

Tulin

2002

ASTROPHYS J SUPPL S

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We report a combination of high and low spectral resolution far-ultraviolet spectral data for several groupings of bright radiative shock filaments in the Cygnus Loop supernova remnant. The high-resolution spectra were obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite and cover the 905-1187 Å spectral region at 0.1-0.3 Å resolution, depending on observing aperture. The low-resolution data were obtained with the Hopkins Ultraviolet Telescope (HUT) and cover the 850-1850 Å spectral region at $3 Å resolution. These data sets complement each other, with the HUT data providing the broader context of a wider range of emission lines and the FUSE data resolving line profiles from nearby airglow emissions and allowing detailed line profiles to be studied. Relative line intensities and line profiles change on a wide variety of spatial scales. O vi 1032, 1038 emission is much more generally distributed than the optical filaments. The FUSE data provide direct insight into the effects and variability of self-absorption in the strong resonance lines of O vi and C iii 977. Variability of the central reversals in O vi with position indicate a patchy O vi distribution, with self-absorption occurring locally within the remnant. Self-absorption in C iii could be due to the interstellar medium, the local regions of the remnant, or a combination. We also find evidence for overlying molecular hydrogen absorption effects on some lines and suggest an interstellar (foreground) origin. It is likely that these effects have had significant impacts on many previous investigations that based their results on the interpretation of low-resolution spectral data where these effects could not be seen.

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The Hopkins Ultraviolet Telescope - Performance and calibration during the Astro-1 mission

Cited by 102 publications

References 0 publications

Dust Destruction in a Non-Radiative Shock in the Cygnus Loop Supernova Remnant

Dust Destruction in a Non-Radiative Shock in the Cygnus Loop Supernova Remnant

Fluorescent Molecular Hydrogen Emission in IC 63:FUSE, Hopkins Ultraviolet Telescope, and Rocket Observations

Far Ultraviolet Spectroscopic Explorer and Hopkins Ultraviolet Telescope Observations of Radiative Shocks in the Cygnus Loop

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