Do the nearby BHB stars belong to the Thick Disk or the Halo? (2008)
Kinman, T. D., Morrison, Heather L., Brown, Warren R.
We study the Milky Way region Z
Hypervelocity Stars and the Galactic Center (2008)
A summary of the current knowledge on hypervelocity stars (HVSs). HVSs are fascinating because their properties are linked to Sgr A* and the stellar environment of the Galactic Center. Observing the...
The Anisotropic Spatial Distribution of Hypervelocity Stars (2008)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Bromley, Benjamin C.
We study the distribution of angular positions and angular separations of unbound hypervelocity stars (HVSs). HVSs are spatially anisotropic at the 3-sigma level. The spatial anisotropy is...
MMT Hypervelocity Star Survey (2008)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J.
We describe a new survey for unbound hypervelocity stars (HVSs), stars traveling with such extreme velocities that dynamical ejection from a massive black hole (MBH) is their most likely origin. We...
The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 (2008)
Updike, Adria C., Haislip, Joshua B., Nysewander, Melissa C., Fruchter, Andrew S., Kann, D. Alexander, Klose, Sylvio, ...
We report on multi-wavelength observations, ranging from the X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption...
Brown, Warren R., Beers, Timothy C., Wilhelm, Ronald, Prieto, Carlos Allende, Geller, Margaret J., Kenyon, Scott J., ...
We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch (BHB) candidates selected over 4300 deg^2 of the sky. We identify 655 BHB stars in this non-kinematically...
Brown, Warren R., Kewley, Lisa J., Geller, Margaret J.
We demonstrate a successful strategy for identifying extremely metal poor galaxies. Our preliminary survey of 24 candidates contains 10 metal poor galaxies of which 4 have 12+log(O/H)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J., Bromley, Benjamin C.
We report the discovery of 3 new unbound hypervelocity stars (HVSs), stars traveling with such extreme velocities that dynamical ejection from a massive black hole (MBH) is their only suggested...
Stellar Velocity Dispersion of the Leo A Dwarf Galaxy (2007)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J.
We measure the first stellar velocity dispersion of the Leo A dwarf galaxy, \sigma = 9.3 +- 1.3 km/s. We derive the velocity dispersion from the radial velocities of ten young B supergiants and two...
The Discovery of a Companion to the Lowest Mass White Dwarf (2007)
Kilic, Mukremin, Brown, Warren R., Prieto, Carlos Allende, Pinsonneault, M. H., Kenyon, S. J.
We report the detection of a radial velocity companion to SDSS J091709.55+463821.8, the lowest mass white dwarf currently known with M~0.17Msun. The radial velocity of the white dwarf shows...
Hypervelocity Stars II. The Bound Population (2007)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J., Bromley, Benjamin C.
Hypervelocity stars (HVSs) are stars ejected completely out of the Milky Way by three-body interactions with the massive black hole in the Galactic center. We describe 643 new spectroscopic...
The Lowest Mass White Dwarf (2006)
Kilic, Mukremin, Prieto, Carlos Allende, Brown, Warren R., Koester, D.
Extremely low mass white dwarfs are very rare objects likely formed in compact binary systems. We present MMT optical spectroscopy of 42 low mass white dwarf candidates serendipitously discovered in...
SDSS 0809+1729: Connections Between Extremely Metal Poor Galaxies and Gamma Ray Burst Hosts (2006)
Kewley, Lisa J., Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J.
We discuss the serendipitous discovery of an extremely metal poor galaxy, SDSS 0809+1729, classified as a star in the Sloan Digital Sky Survey (SDSS). The galaxy has a redshift z = 0.0441 and a...
Hypervelocity Stars: Predicting the Spectrum of Ejection Velocities (2006)
Bromley, Benjamin C., Kenyon, Scott J., Geller, Margaret J., Barcikowski, Elliott, Brown, Warren R., Kurtz, Michael J.
The disruption of binary stars by the tidal field of the black hole in the Galactic Center can produce the hypervelocity stars observed in the halo. We use numerical models to simulate the full...
Hypervelocity Stars. I. The Spectroscopic Survey (2006)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J.
We discuss our targeted search for hypervelocity stars (HVSs), stars traveling with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Our survey,...
A Successful Targeted Search for Hypervelocity Stars (2006)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J.
Hypervelocity stars (HVSs) travel with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Following our discovery of the first HVS, we have...
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J., Prieto, Carlos Allende, Beers, Timothy C., ...
We discuss a 175 deg^2 spectroscopic survey for blue horizontal branch (BHB) stars in the Galactic halo. We use the Two Micron All Sky Survey (2MASS) and the Sloan Digital Sky Survey (SDSS) to select...
Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo (2005)
Brown, Warren R., Geller, Margaret J., Kenyon, Scott J., Kurtz, Michael J.
We have discovered a star, SDSS J090745.0+024507, leaving the Galaxy with a heliocentric radial velocity of +853+-12 km/s, the largest velocity ever observed in the Milky Way halo. The star is either...
Brown, Warren R., Epps, Harland W., Fabricant, Daniel G.
The Ohara glass S-FTM16 is of considerable interest for near-infrared optical designs because it transmits well through the K band and because negative S-FTM16 elements can be used to accurately...
Surveying the Inner Halo of the Galaxy with 2MASS-Selected Horizontal Branch Candidates (2003)
Brown, Warren R., Geller, M. J., Kenyon, S. J., Beers, T. C., Kurtz, M. J., Roll, J. B.
We use 2MASS photometry to select blue horizontal branch (BHB) candidates covering the sky |b|>15 deg. A 12.5
Preprint typeset using L A T E X style emulateapj v. 20/04/00 (2003)
Warren R. Brown, Carlos Allende Prieto, Timothy C. Beers, Ronald Wilhelm, Margaret J. Geller, Scott J. Kenyon, ...
The Century Survey Galactic Halo Project is a photometric and spectroscopic survey from which we select relatively blue stars (V R < 0:30 mag) as probes of the Milky Way halo. The Survey strip spans...
A Detailed Thermal Analysis of the Binospec Spectrograph (2002)
Brown, Warren R., Fabricant, Daniel G., Boyd, David A.
Refractive optics in astronomical instruments are potentially sensitive to temperature gradients and temperature transients. This sensitivity arises from thermally dependent refractive indices, lens...
Brown, Warren R., Geller, Margaret J., Fabricant, Daniel G., Kurtz, Michael J.
We use 64 square degrees of deep V and R CCD images to measure the local V and R band luminosity function of galaxies. The V_0
UV excess galaxies: Wolf-Rayet galaxies (2000)
Brown, Warren R., Kenyon, Scott J., Geller, Margaret J., Fabricant, Daniel G.
We discuss V and R band photometry for 67% of the Sullivan et al. 2000 SA57 ultraviolet-selected galaxy sample. In a sample of 176 UV-selected galaxies, Sullivan et al. 2000 find that 24% have (UV-B)...