Browsing FAS Scholarly Articles by Title
Now showing items 69-88 of 18292
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A constrained transport scheme for MHD on unstructured static and moving meshes
(Oxford University Press, 2014)Magnetic fields play an important role in many astrophysical systems and a detailed understanding of their impact on the gas dynamics requires robust numerical simulations. Here we present a new method to evolve the ideal ... -
A cool starspot or a second transiting planet in the TrES-1 system?
(EDP Sciences, 2009)Aims. We investigate the origin of a flux increase found during a transit of TrES-1, observed with the HST (Hubble Space Telescope). This feature in the HST light curve cannot be attributed to noise and is supposedly a ... -
A Cosmological Framework for the Co‐evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity
(American Astronomical Society, 2008-04) -
A Cosmological Framework for the Co‐evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. II. Formation of Red Ellipticals
(American Astronomical Society, 2008-04)We develop and test a model for the cosmological role of mergers in the formation and quenching of red, early-type galaxies. By combining theoretically well-constrained halo and subhalo mass functions as a function of ... -
A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources
(American Astronomical Society, 2005)We have detected 300 X-ray sources within the half-mass radius (2.'79) of the globular cluster 47 Tucanae in a deep (281 ks) Chandra exposure. We perform photometry and simple spectral fitting for our detected sources and ... -
A discontinuous Galerkin method for solving the fluid and magnetohydrodynamic equations in astrophysical simulations
(Oxford University Press, 2014)A discontinuous Galerkin (DG) method suitable for large-scale astrophysical simulations on Cartesian meshes as well as arbitrary static and moving Voronoi meshes is presented. Most major astrophysical fluid dynamics codes ... -
A DWARF NOVA IN THE GLOBULAR CLUSTER M13
(American Astronomical Society, 2011)Dwarf novae (DNe) in globular clusters (GCs) seem to be rare with only 13 detections in the 157 known Galactic GCs. We report the identification of a new DN in M13, the 14th DN identified in a GC to date. Using the 2 m ... -
A Dynamical Method for Measuring the Masses of Stars with Transiting Planets
(American Astronomical Society, 2005)As a planet transits the face of a star, it accelerates along the line of sight. The changing delay in the propagation of photons produces an apparent deceleration of the planet across the sky throughout the transit. This ... -
A Dynamical Study of the Eclipsing Nova OY Arae
(American Astronomical Society, 1997) -
A Flat Photoionization Rate at 2 ≤ z ≤ 4.2: Evidence for a Stellar-Dominated UV Background and against a Decline of Cosmic Star Formation beyond z ~ 3
(American Astronomical Society, 2008-07-20) -
A general model for the CO-H2 conversion factor in galaxies with applications to the star formation law
(Oxford University Press, 2012)The most common means of converting an observed CO line intensity into a molecular gas mass requires the use of a conversion factor (XCO). While in the Milky Way this quantity does not appear to vary significantly, there ... -
A genotyping strategy based on incorporation and cleavage of chemically modified nucleotides
(National Academy of Sciences, 2002)Aiming to facilitate the analysis of human genetic variations in the context of disease susceptibility and varied drug response, we have developed a genotyping method that entails incorporation of a chemically labile ... -
A geometric realization of confinement
(Elsevier, 1996)We study the geometric realization of the Higgs phenomenon in type II string compactifications on Calabi-Yau manifolds. The string description is most directly phrased in terms of confinement of magnetic flux, with magnetic ... -
A geometric unification of dualities
(Elsevier, 2002)We study the dynamics of a large class of A = I quiver theories, geometrically realized by type IIB D-brane probes wrapping cycles of local Calabi-Yau three-folds. These include V = 2 (affine) A-D-E quiver theories deformed ... -
A Grand Gender Convergence: Its Last Chapter
(American Economic Association, 2014)The converging roles of men and women are among the grandest advances in society and the economy in the last century. These aspects of the grand gender convergence are figurative chapters in a history of gender roles. But ... -
A high-capacity column for affinity purification of sequence-specific DNA-binding proteins
(Oxford University Press, 1992) -
A high-throughput cellulase screening system based on droplet microfluidics
(AIP Publishing, 2014)A new ultra-high-throughput screening assay for the detection of cellulase activity was developed based on microfluidic sorting. Cellulase activity is detected using a series of coupled enzymes leading to the formation of ... -
A HIRES/KECK SPECTROSCOPIC INVESTIGATION OF THE MEASUREMENT OF SODIUM IN THE ATMOSPHERE OF HD 209458b
(American Astronomical Society, 2009)We present high-resolution High Resolution Echelle Spectrometer (HIRES)/Keck spectra of HD 209458, and a Monte Carlo variation on the basic method used by other workers, to look for the excess in-transit absorption in the ... -
A Hubble Space Telescope transit light curve for GJ 436b
(EDP Sciences, 2008-08-10)We present time series photometry for six partial transits of GJ 436b obtained with the Fine Guidance Sensor instrument on the Hubble Space Telescope (HST). Our analysis of these data yields independent estimates of the ...