David Syphers

Ten More New Sightlines for the Study of Intergalactic Helium, and Hundreds of Far-UV-Bright Quasars, from SDSS, GALEX, and HST (2009)

Syphers, David, Anderson, Scott F., Zheng, Wei, Haggard, Daryl, Meiksin, Avery, Schneider, Donald P., ...

Absorption along quasar sightlines remains among the most sensitive direct measures of HeII reionization in much of the intergalactic medium (IGM). Until recently, fewer than a half-dozen unobscured...

A High Yield of New Sightlines for the Study of Intergalactic Helium: Far-UV-Bright Quasars from SDSS, GALEX, and HST (2008)

Syphers, David, Anderson, Scott F., Zheng, Wei, Haggard, Daryl, Meiksin, Avery, Chiu, Kuenley, ...

Investigations of He II Ly-alpha (304 A rest) absorption toward a half-dozen quasars at z~3-4 have demonstrated the great potential of helium studies of the IGM, but the current critically small...

Eclipsing binary stars in the Large and Small Magellanic Clouds from the MACHO project: The Sample (2007)

Faccioli, Lorenzo, Alcock, Charles, Cook, Kem, Prochter, Gabriel E., Protopapas, Pavlos, Syphers, David

We present a new sample of 4634 eclipsing binary stars in the Large Magellanic Cloud (LMC), expanding on a previous sample of 611 objects and a new sample of 1509 eclipsing binary stars in the Small...

A large, uniform sample of X-ray-emitting active galactic nuclei from the ROSAT all sky and sloan digital sky surveys: the data release 5 sample (2007)

Anderson, Scott F., Margon, Bruce, Voges, Wolfgang, Plotkin, Richard M., Syphers, David, Haggard, Daryl, ...

A Large, Uniform Sample of X-ray Emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample (2006)

Anderson, Scott F., Margon, Bruce, Voges, Wolfgang, Plotkin, Richard M., Syphers, David, Haggard, Daryl, ...

We describe further results of a program aimed to yield ~10^4 fully characterized optical identifications of ROSAT X-ray sources. Our program employs X-ray data from the ROSAT All-Sky Survey (RASS),...

A large, uniform sample of X-ray emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample (2003)

Anderson, Scott, Margon, Bruce, Voges, Wolfgang, Plotkin, Richard, Syphers, David, Haggard, Daryl, ...

Also archived in: arXiv:astro-ph/0609458 v1 Sep 15 2006