&lt;title&gt;Design and fabrication of a 40-cm-diameter SiC-coated normal incidence telescope and spectrometer&lt;/title&gt;

McCandliss, Stephan R.; Martinez, M. E.; Feldman, P. D.; Pelton, Russell; Keski-Kuha, Ritva; Gum, Jeffrey S.

doi:10.1117/12.167206

Cited by 8 publications

(4 citation statements)

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“…LIDOS employs two complimentary UV-sensitive detectors to achieve a large dynamic range in flux for imaging spectroscopy. An updated version of the Faint Object Telescope (0.4 m diameter, f/ 15.7 Dall-Kirkham: Hartig et al 1980;McCandliss et al 1994;France et al 2004) focuses light at the entrance aperture of the spectrograph, a mirrored slit jaw into which a long slit (10 00 ; 300 00 ) is etched. The light entering the 600 mm diameter Rowland spectrograph is dispersed by a silicon carbide grating.…”

Section: Soundinggrocket Observv Ation Of Casmentioning

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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Section: Soundinggrocket Observv Ation Of Casmentioning

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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“…The spectrograph housing 42 will be evacuated and mounted to the back of the primary mirror baseplate. An angled mirrored plate with a 1 mm aperture in the center located at the telescope focus serves as the slit jaw, allowing light to enter the spectrograph while reflecting the region surrounding the target into an image-intensified video camera for real- time viewing and control by the operator on the ground.…”

Section: Access Telescope and Spectro-graphmentioning

confidence: 99%

ACCESS: Enabling an Improved Flux Scale for Astrophysics

Kaiser,

Kruk,

McCandliss

et al. 2010

Preprint

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Improvements in the precision of the astrophysical flux scale are needed to answer fundamental scientific questions ranging from cosmology to stellar physics. The unexpected discovery 1,2 that the expansion of the universe is accelerating was based upon the measurement of astrophysical standard candles that appeared fainter than expected. To characterize the underlying physical mechanism of the "Dark Energy" responsible for this phenomenon requires an improvement in the visible-NIR flux calibration of astrophysical sources to 1% precision. These improvements will also enable large surveys of white dwarf stars, e.g. GAIA, 3 to advance stellar astrophysics by testing and providing constraints for the mass-radius relationship of these stars. ACCESS (Absolute Color Calibration Experiment for Standard Stars)4 is a rocket-borne payload that will enable the transfer of absolute laboratory detector standards from NIST to a network of stellar standards with a calibration accuracy of 1% and a spectral resolving power of R = 500 across the 0.35-1.7 µm bandpass.Among the strategies being employed to minimize calibration uncertainties are: (1) judicious selection of standard stars (previous calibration heritage, minimal spectral features, robust stellar atmosphere models), (2) execution of observations above the Earth's atmosphere (eliminates atmospheric contamination of the stellar spectrum), (3) a single optical path and detector (to minimize visible to NIR cross-calibration uncertainties), (4) establishment of an a priori error budget, (5) on-board monitoring of instrument performance, and (6) fitting stellar atmosphere models to the data to search for discrepancies and confirm performance.

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“…The primary mirror and secondary grating will be coated with ion beam sputtered SiC with Al undercoating to keep the zero order reflectivity high. 20 The diameter of the primary will be 500 mm, which is set by the inner diameter of the largest sounding rocket skin that the NASA sounding rocket program provides. We use an f/2 focal ratio for the primary, because slower beams require larger gratings, while faster beams cause the image quality to suffer.…”

Section: Optical Layoutmentioning

confidence: 99%

FORTIS: pathfinder to the Lyman continuum

McCandliss

Feldman

Glazebrook

et al. 2004

UV and Gamma-Ray Space Telescope Systems

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Shull et al. 4 have asserted that the contribution of stars, relative to quasars, to the metagalactic background radiation that ionizes most of the baryons in the universe remains almost completely unknown at all epochs. The potential to directly quantify this contribution at low redshift has recently become possible with the identification by GALEX of large numbers of sparsely distributed faint ultraviolet galaxies. Neither STIS nor FUSE nor GALEX have the ability to efficiently survey these sparse fields and directly measure the Lyman continuum radiation that may leak into the low redshift (z < 0.4) intergalactic medium. We present here a design for a new type of far ultraviolet spectrograph, one that is more sensitive, covers wider fields, and can provide spectra and images of a large number of objects simultaneously, called the Farultraviolet Off Rowland-circle Telescope for Imaging and Spectroscopy (FORTIS). We intend to use a sounding rocket flight to validate the new instrument with a simple long-slit observation of the starburst populations in the galaxy M83. If however, the long-slit were replaced with microshutter array, this design could isolate the chains of blue galaxies found by GALEX over an ≈ 30' diameter field-of-view and directly address the Lyman continuum problem in a long duration orbital mission. Thus, our development of the sounding rocket instrument is a pathfinder to a new wide field spectroscopic technology for enabling the potential discovery of the long hypothesized but elusive Lyman continuum radiation that is thought to leak from low redshift galaxies and contribute to the ionization of the universe.

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<title>Design and fabrication of a 40-cm-diameter SiC-coated normal incidence telescope and spectrometer</title>

Cited by 8 publications

References 0 publications

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

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

ACCESS: Enabling an Improved Flux Scale for Astrophysics

FORTIS: pathfinder to the Lyman continuum

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