Dr. William P. Blair Profile

Dr. William P. Blair

Research Professor at Johns Hopkins Univ

SPIE Involvement:

Author

Publications (7)

Proceedings Article | 15 July 2016 Paper

Planning JWST NIRSpec MSA spectroscopy using NIRCam pre-images

Tracy Beck, Leonardo Ubeda, Susan Kassin, Karoline Gilbert, Diane Karakla, I. Reid, William Blair, Charles Keyes, D. Soderblom, Maria Peña-Guerrero

Proceedings Volume 9910, 99101O (2016) https://doi.org/10.1117/12.2232804

KEYWORDS: James Webb Space Telescope, Spectroscopy, Camera shutters, Cameras, James Webb Space Telescope, Spectroscopy, Imaging spectroscopy, Target acquisition, Sensors, Stars, Calibration, Molybdenum

Read Abstract +

Proceedings Article | 15 July 2008 Paper

Project Lyman

Stephan McCandliss, Jeffrey Kruk, William Blair, Mary Elizabeth Kaiser, Paul Feldman, Gerhardt Meurer, William Dixon, David Sahnow, David Neufeld, Roxana Lupu, Brian Fleming, Stephen Smee, B. Andersson, Samuel Moseley, Alexander Kutyrev, Mary Li, George Sonneborn, Oswald Siegmund, John Vallerga, Barry Welsh, Massimo Stiavelli, Rogier Windhorst, Alice Shapley

Proceedings Volume 7011, 701120 (2008) https://doi.org/10.1117/12.789574

KEYWORDS: Galactic astronomy, Camera shutters, Stars, Sensors, Photons, Telescopes, Near ultraviolet, Ionization, Spectroscopy, James Webb Space Telescope

Read Abstract +

We explore the design of a space mission called Project Lyman that has the goal of quantifying the ionization history of the universe from the present epoch to a redshift of z ~ 3. Observations from WMAP and SDSS show that before a redshift of z (Symbol not available. See manuscript.) 6 the first collapsed objects, possibly dwarf galaxies, emitted Lyman continuum (LyC) radiation shortward of 912 Å that reionized most of the universe. Theoretical estimates of the LyC escape fraction ( f_esc ) required from these objects to complete reionization is f_esc~10%. How LyC escapes from galactic environments, whether it induces positive or negative feedback on the local and global collapse of structures, and the role played by clumping, molecules, metallicity and dust are major unanswered theoretical questions, requiring observational constraint. Numerous intervening Lyman limit systems frustrate the detection of LyC from high z objects. They thin below z ~ 3 where there are reportedly a few cases of apparently very high fesc. At low z there are only controversial detections and a handful of upper limits. A wide-field multi-object spectroscopic survey with moderate spectral and spatial resolution can quantify f_esc within diverse spatially resolved galactic environments over redshifts with significant evolution in galaxy assemblage and quasar activity. It can also calibrate LyC escape against Lyα escape, providing an essential tool to JWST for probing the beginnings of reionization. We present calculations showing the evolution of the characteristic apparent magnitude of star-forming galaxy luminosity functions at 900 Å, as a function of redshift and assumed escape fraction. These calculations allow us to determine the required aperture for detecting LyC and conduct trade studies to guide technology choices and balance science return against mission cost. Finally we review our efforts to build a pathfinding dual order multi-object spectro/telescope with a (0.5°)² field-of-view, using a GSFC microshutter array, and crossed delay-line micro-channel plate detector.

Proceedings Article | 7 June 2006 Paper

Operations with the new FUSE Observatory: three-axis control with one reaction wheel

David Sahnow, Jeffrey Kruk, Thomas Ake, B-G Andersson, Alice Berman, William Blair, Robert Boyer, James Caplinger, Humberto Calvani, Thomas Civeit, W. Van Dyke Dixon, Martin England, Mary Elizabeth Kaiser, Mark Kochte, H. Warren Moos, Bryce Roberts

Proceedings Volume 6266, 626602 (2006) https://doi.org/10.1117/12.673408

KEYWORDS: Satellites, Magnetism, Gyroscopes, Space operations, Control systems, Observatories, Data archive systems, Sensors, Solids, Far ultraviolet

Read Abstract +

Proceedings Article | 11 October 2004 Paper

FORTIS: pathfinder to the Lyman continuum

Stephan McCandliss, Kevin France, Paul Feldman, Karl Glazebrook, Gerhardt Meurer, Luciana Bianchi, H. Moos, Jeffrey Kruk, William Blair, Ivan Baldry

Proceedings Volume 5488, (2004) https://doi.org/10.1117/12.552799

KEYWORDS: Galactic astronomy, Imaging spectroscopy, Spectral resolution, Spectrographs, Far ultraviolet, Sensors, Monochromatic aberrations, Spectroscopes, Rockets, Spectroscopy

Read Abstract +

Proceedings Article | 24 February 2003 Paper

Operations with the FUSE observatory

William Blair, Jeffrey Kruk, Henry Moos, William Oegerle

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459814

KEYWORDS: Satellites, Space operations, Observatories, Data archive systems, Astronomy, Control systems, Gyroscopes, Space telescopes, Telescopes, Stars

Read Abstract +

Proceedings Article | 18 December 2000 Paper

Far Ultraviolet Spectroscopic Explorer: one year in orbit

David Sahnow, Henry Moos, Scott Friedman, William Blair, Steven Conard, Jeffrey Kruk, Edward Murphy, William Oegerle, Thomas Ake

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410516

KEYWORDS: Satellites, Sensors, Calibration, Far ultraviolet, Mirrors, UV-Vis spectroscopy, Silicon carbide, Line width roughness, Satellite communications, Laser induced fluorescence

Read Abstract +

Proceedings Article | 28 July 2000 Paper

On-orbit performance of the Far Ultraviolet Spectroscopic Explorer (FUSE)

David Sahnow, Henry Moos, Thomas Ake, B. Andersson, Martial Andre, David Artis, Alice Berman, William Blair, Kenneth Brownsberger, Humberto Calvani, Pierre Chayer, Steven Conard, Paul Feldman, Scott Friedman, Alex Fullerton, Geoffrey Gaines, James Green, Mark Gummin, J. Joyce, Mary Elizabeth Kaiser, Jeffrey Kruk, Don Lindler, Derck Massa, Edward Murphy, William Oegerle, Raymond Ohl, Steven Osterman, Bryce Roberts, Katherine Roth, Ravi Sankrit, Kenneth Sembach, Robin Shelton, Oswald Siegmund, Harold Weaver, Erik Wilkinson

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.394015

KEYWORDS: Sensors, Mirrors, Satellites, Far ultraviolet, Silicon carbide, Spectrographs, Calibration, UV-Vis spectroscopy, Laser induced fluorescence, Line width roughness

Read Abstract +

Showing 5 of 7 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years