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"Stars, Brightest."
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Super stars : the biggest, hottest, brightest, most explosive stars in the Milky Way
Describes fifteen of the most unusual known stars, plus other interesting stellar objects.
Book
First magnitude
“First Magnitude” is an entry-level book for readers with brightly lit skies. Its purpose is to show them that all is not lost, that they can still enjoy personal astronomy and have an appreciation of the heavens no matter where they live. It concentrates on the Sun, Moon, the five bright planets, and on the 23 brightest stars, which are visible from just about anywhere. The book concludes with bright ephemeral phenomena: meteors, comets, and exploding stars. The concept is a platform for introducing the reader to the wonders of the nighttime and daytime skies and serves as an introduction to general astronomy.
eBook
Shapes and Centroids of 39 Strong Lensing Galaxy Clusters from the Sloan Giant Arcs Survey
Strong lensing galaxy clusters provide a powerful observational test of Cold Dark Matter (CDM) structure predictions derived from simulation. Specifically, the shape and relative alignments of the dark matter halo, stars, and hot intracluster gas tells us the extent to which theoretical structure predictions hold for clusters in various dynamical states. We measure the position angles, ellipticities, and locations/centroids of the brightest cluster galaxy (BCG), intracluster light (ICL), the hot intracluster medium (ICM), and the core lensing mass for a sample of strong lensing galaxy clusters from the SDSS Giant Arcs Survey (SGAS). We use iterative elliptical isophote fitting methods and GALFIT modeling on HST WFC3/IR imaging data to extract ICL and BCG information and use CIAO’s Sherpa modeling on Chandra ACIS-I X-ray data to make measurements of the ICM. Using this multicomponent approach, we attempt to constrain the physical state of these strong lensing clusters and evaluate the different observable components in terms of their ability to trace out the gravitational potential of the cluster.
Journal Article
Vietnam's forgotten army : heroism and betrayal in the ARVN
2009 Society for Military History Distinguished Book Award for Biography Vietnam's Forgotten Army: Heroism and Betrayal in the ARVN chronicles the lives of Pham Van Dinh and Tran Ngoc Hue, two of the brightest young stars in the Army of the Republic of Vietnam (ARVN). Both men fought with valor in a war that seemed to have no end, exemplifying ARVN bravery and determination that is largely forgotten or ignored in the West. However, while Hue fought until he was captured by the North Vietnamese Army and then endured thirteen years of captivity, Dinh surrendered and defected to the enemy, for whom he served as a teacher in the reeducation of his former ARVN comrades. An understanding of how two lives that were so similar diverged so dramatically provides a lens through which to understand the ARVN and South Vietnam's complex relationship with Americas government and military. The lives of Dinh and Hue reflect the ARVNs battlefield successes, from the recapture of the Citadel in Hue City in the Tet Offensive of 1968, to Dinhs unheralded role in the seizure of Hamburger Hill a year later. However, their careers expose an ARVN that was over-politicized, tactically flawed, and dependent on American logistical and firepower support. Marginalized within an American war, ARVN faced a grim fate as U.S. forces began to exit the conflict. As the structure of the ARVN/U.S. alliance unraveled, Dinh and Hue were left alone to make the most difficult decisions of their lives. Andrew Wiest weaves historical analysis with a compelling narrative, culled from extensive interviews with Dinh, Hue, and other key figures. Once both military superstars, Dinh is viewed by a traitor by many within the South Vietnamese community, while Hue, an expatriate living in northern Virginia, is seen as a hero who never let go of his ideals. Their experiences and legacies mirror that of the ARVNs rise and fall as well as the tragic history of South Vietnam.
eBook
Structural Properties of Brightest Cluster Galaxies
We present the first modern systematic study of local brightest cluster galaxy (BCG) profiles that extends to radii beyond 200h^sup -1^kpc. Measuring the surface brightness profiles of BCGs out to large radii is critical for understanding the processes driving their formation. The form of the profiles yields information about the current dynamical state, constrains the accretion history of these galaxies, and places limits on any radially symmetric component of intracluster light. The observational challenges associated with CCD photometry at low surface brightness levels have until now precluded such an analysis for a statistical sample of BCGs. Utilizing drift-scan data and new techniques that we have developed, we extend upon previous work by modelling the profiles for a sample of 31 clusters at z that span a wide range in mass and dynamical state. We find that the BCGs in our sample generally are best fit using two-component models consisting of inner and outer Sersic profiles. In this proceeding we present the preliminary results of our analysis and discuss implications for current models of BCG formation.[PUBLICATION ABSTRACT]
Journal Article