Daryl Haggard

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...

Probing the Balance of AGN and Star-Forming Activity in the Local Universe with ChaMP (2009)

Constantin, Anca, Green, Paul, Aldcroft, Tom, Kim, Dong-Woo, Haggard, Daryl, Barkhouse, Wayne, ...

The combination of the SDSS and the Chandra Multiwavelength Project (ChaMP) currently offers the largest and most homogeneously selected sample of nearby galaxies for investigating the relation...

Increasing the Number of Underrepresented Minorities in Astronomy: Executive Summary (2009)

Norman, Dara, Agueros, Marcel, Anderson, Scott F., Baker, Andrew, ...

Promoting racial and ethnic diversity is critically important to the future success and growth of the field of astronomy. The raw ability, drive and interest required to excel in the field is...

Increasing the Number of Underrepresented Minorities in Astronomy at the Undergraduate, Graduate, and Postdoctoral Levels (Paper I) (2009)

Norman, Dara, Agueros, Marcel, Anderson, Scott F., Baker, Andrew, ...

If the ethnic makeup of the astronomy profession is to achieve parity with the general population within one generation (~30 years), the number of underrepresented minorities earning graduate degrees...

Increasing the Number of Underrepresented Minorities in Astronomy Through K-12 Education and Public Outreach (Paper II) (2009)

Norman, Dara, Agueros, Marcel, Anderson, Scott F., Baker, Andrew, ...

In order to attract, recruit and retain underrepresented minority students to pursue Astronomy and related fields, we must ensure that there continues to be a well qualified pool of graduate and...

A Chandra Study of the Galactic Globular Cluster Omega Centauri (2009)

Haggard, Daryl, Cool, Adrienne M., Davies, Melvyn B.

We analyze a ~70 ksec Chandra ACIS-I exposure of the globular cluster Omega Centauri (NGC 5139). The ~17 amin x 17 amin field of view fully encompasses three core radii and almost twice the half-mass...

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...

Two more candidate AM Canum Venaticorum (AM CVn) Binaries from the Sloan Digital Sky Survey (2008)

Anderson, Scott, Becker, Andrew, Haggard, Daryl, Prieto, Jose Luis, Knapp, Gillian, Sako, Masao, ...

Also archived in: arXiv:0802.2240 v1 Feb 15 2008

The Milky Way Tomography with SDSS: II. Stellar Metallicity (2008)

Ivezic, Zeljko, Sesar, Branimir, Juric, Mario, Bond, Nicholas, Dalcanton, Julianne, Rockosi, Constance M., ...

Using effective temperature and metallicity derived from SDSS spectra for ~60,000 F and G type main sequence stars (0.2

The milky way tomography with SDSS. II. Stellar metallicity (2008)

Ivezic, Zeljko, Sesar, Branimir, Juric, Mario, Bond, Nicholas, Dalcanton, Julianne, Rockosi, Constance M., ...

Using effective temperature and metallicity derived from SDSS spectra for ~60,000 F- and G-type main-sequence stars (0.2

Stellar SEDs from 0.3-2.5 Microns: Tracing the Stellar Locus and Searching for Color Outliers in SDSS and 2MASS (2007)

Covey, Kevin R., Ivezic, Zeljko, Schlegel, David J., Finkbeiner, Douglas P., Padmanabhan, Nikhil, Lupton, Robert H., ...

The Sloan Digital Sky Survey (SDSS) and Two Micron All Sky Survey (2MASS) are rich resources for studying stellar astrophysics and the structure and formation history of the Galaxy. As new surveys...

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),...

Ultracompact AM CVn Binaries from the Sloan Digital Sky Survey: three candidates plus the first confirmed Eclipsing System (2005)

Anderson, Scott, Haggard, Daryl, Homer, Lee, Joshi, Nikhil, Margon, Bruce, Silvestri, Nicole, ...

Also archived in: arXiv:astro-ph/0506730 v1 Jun 29 2005

Ultracompact AM CVn Binaries from the Sloan Digital Sky Survey: Three Candidates Plus the First Confirmed Eclipsing System (2005)

Anderson, Scott F., Haggard, Daryl, Homer, Lee, Joshi, Nikhil R., Margon, Bruce, Silvestri, Nicole M., ...

AM CVn systems are a rare (about a dozen previously known) class of cataclysmic variables, arguably encompassing the shortest orbital periods (down to about 10 minutes) of any known binaries. Both...

The UV, Optical, and IR Properties of SDSS Sources Detected by GALEX (2005)

Agueros, Marcel A., Ivezic, Zeljko, Covey, Kevin R., Obric, Mirela, Hao, Lei, Walkowicz, Lucianne M., ...

We discuss the UV, optical, and IR properties of the SDSS sources detected by GALEX as part of its All-sky Imaging Survey Early Release Observations. Virtually all of the GALEX sources in the overlap...

High-resolution X-ray & optical imaging of binary populations in Omega Centauri / (2004)

Haggard, Daryl.

Typescript.

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