Browsing FAS Scholarly Articles by Title
Now showing items 61-80 of 17845
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A CHANDRA X-RAY OBSERVATORY STUDY OF PSR J1740-5340 AND CANDIDATE MILLISECOND PULSARS IN THE GLOBULAR CLUSTER NGC 6397
(American Astronomical Society, 2010) -
A Chandra X-Ray study of the dense globular cluster Terzan 5
(American Astronomical Society, 2003)We report a Chandra ACIS-I observation of the dense globular cluster Terzan 5. The previously known transient low-mass X-ray binary (LMXB) EXO 1745-248 in the cluster entered a rare high state during our 2000 August ... -
A Chandra X‐Ray Study of the Globular Cluster M80
(American Astronomical Society, 2003) -
A Characteristic Division Between the Fueling of Quasars and Seyferts: Five Simple Tests
(American Astronomical Society, 2009)Given the existence of the M-BH-sigma relation, models of self-regulated black hole (BH) growth require both a fuel supply and concomitant growth of the host bulge to deepen the central potential, or else the system will ... -
A Chrysin Derivative Suppresses Skin Cancer Growth by Inhibiting Cyclin-dependent Kinases
(American Society for Biochemistry and Molecular Biology, 2013)Chrysin (5,7-dihydroxyflavone), a natural flavonoid widely distributed in plants, reportedly has chemopreventive properties against various cancers. However, the anticancer activity of chrysin observed in in vivo studies ... -
A COMPLETE Look at the Use of IRAS Emission Maps to Estimate Extinction and Dust Temperature
(American Astronomical Society, 2005)We have created new dust temperature and column density maps of Perseus, Ophiuchus, and Serpens using 60 and 100 mu m data from the Improved Reprocessing of the IRAS Survey ( IRIS) recalibration of Infrared Astronomical ... -
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 ...