The Acceleration of the Nebular Shells in Planetary Nebulae in the Milky Way BulgeWe present a systematic study of line widths in the [O3]λ5007 and Hα lines for a sample of 86 planetary nebulae in the Milky Way bulge based upon spectroscopy obtained at the…Michael G. Richer, Jose Alberto Lopez, Margarita Pereyra et al.·Aug 19, 2008SaveLearn
Combined Chandra, XMM-Newton and Hubble Space Telescope observations of the Galactic globular cluster NGC 2808Using new Chandra X-ray observations and existing XMM-Newton X-ray and Hubble far ultraviolet observations, we aim to detect and identify the faint X-ray sources belonging to the Galactic globular…M. Servillat, A. Dieball, N. A. Webb et al.·Aug 19, 2008SaveLearn
The Chemical and Ionization Conditions in Weak Mg II AbsorbersWe present an analysis of the chemical and ionization conditions in a sample of 100 weak Mg II absorbers identified in the VLT/UVES archive of quasar spectra. Using a host of low ionization lines…Anand Narayanan, Jane C. Charlton, Toru Misawa et al.·Aug 19, 2008SaveLearn
The Extended Star Formation History of the Andromeda Spheroid at 35 Kpc on the Minor AxisUsing the HST ACS, we have obtained deep optical images reaching well below the oldest main sequence turnoff in fields on the southeast minor-axis of the Andromeda Galaxy, 35 kpc from the nucleus.…Thomas M. Brown, Rachael Beaton, Masashi Chiba et al.·Aug 19, 2008SaveLearn
DLA kinematics and outflows from starburst galaxiesWe present results from a numerical study of the multiphase interstellar medium in sub-Lyman-break galaxy protogalactic clumps. Such clumps are abundant at z=3 and are thought to be a major…Alexei O. Razoumov·Aug 19, 2008SaveLearn
Ubiquitous Water Masers in Nearby Star-Forming GalaxiesWe report the detection of water maser emission from four nearby galaxies hosting ultradense HII (UDHII) regions, He 2-10, the Antennae galaxies (NGC 4038/4039), NGC 4214, and NGC 5253, with the…Jeremy Darling, Crystal Brogan, Kelsey Johnson·Aug 19, 2008SaveLearn
Structure and star formation in galaxies out to z=3: evidence for surface density dependent evolution and upsizingWe present an analysis of galaxies in the CDF-South. We find a tight relation to z=3 between color and size at a given mass, with red galaxies being small, and blue galaxies being large. We show that…Marijn Franx, Pieter G. van Dokkum, Natascha M. Foerster Schreiber et al.·Aug 19, 2008SaveLearn
Fitting the Gamma-Ray Spectrum from Dark Matter with DMFIT: GLAST and the Galactic Center RegionWe study the potential of GLAST to unveil particle dark matter properties with gamma-ray observations of the Galactic center region. We present full GLAST simulations including all gamma-ray sources…Tesla E. Jeltema, Stefano Profumo·Aug 19, 2008SaveLearn
Galaxy populations in the Antlia cluster. II. Compact elliptical galaxy candidatesWe present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the FS90 Antlia Group catalogue. Only 6 members of this rare type of galaxies are known until now.…Analia V. Smith Castelli, Favio R. Faifer, Tom Richtler et al.·Aug 19, 2008SaveLearn
Identification of the TW Hya Association member 2M1235-39: a tertiary component of the HR 4796 systemThe association of the late-type star 2MASS J12354893-3950245 (2M1235-39) with a bright X-ray source detected serendipitously by ROSAT and XMM-Newton, combined with its proximity to the well-studied…Joel H. Kastner, B. Zuckerman, M. Bessell·Aug 19, 2008SaveLearn
Is there a Supermassive Black Hole at the Center of the Milky Way?This review outlines the observations that now provide an overwhelming scientific case that the center of our Milky Way Galaxy harbors a supermassive black hole. Observations at infrared wavelength…Mark J. Reid·Aug 19, 2008SaveLearn
The Evolution of L and T Dwarfs in Color-Magnitude DiagramsWe present new evolution sequences for very low mass stars, brown dwarfs and giant planets and use them to explore a variety of influences on the evolution of these objects. We compare our results…D. Saumon, M. S. Marley·Aug 19, 2008SaveLearn
Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey QuasarsWe analyze archived Chandra and XMM-Newton X-ray observations of 536 Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) quasars (QSOs) at 1.7 <= z <= 2.7 in order to characterize the relative UV…Robert R. Gibson, W. N. Brandt, Donald P. Schneider·Aug 19, 2008SaveLearn
Star cluster evolution in the Magellanic Clouds revisitedThe evolution of star clusters in the Magellanic Clouds has been the subject of significant recent controversy, particularly regarding the importance and length of the earliest, largely…Richard de Grijs, Simon P. Goodwin·Aug 19, 2008SaveLearn
Muon Charge Ratio of Ultrahigh Energy Cosmic RaysThe muon charge ratio of ultrahigh energy cosmic rays may provide information to detect the composition of the primary cosmic rays. We propose to extract the charge information of high energy muons…Bo-Qiang Ma·Aug 19, 2008SaveLearn
The eSMA: description and first resultsThe eSMA ("extended SMA") combines the SMA, JCMT and CSO into a single facility, providing enhanced sensitivity and spatial resolution owing to the increased collecting area at the longest…Sandrine Bottinelli, Ken H. Young, Richard Chamberlin et al.·Aug 19, 2008SaveLearn
Evolution of Metric Perturbations in Quintom Bounce modelWe in the paper study the metric perturbations generated in a bouncing universe driven by the Quintom matter. Firstly, we review the background evolution of Quintom Bounce and the power spectrum of…Yi-Fu Cai, Xinmin Zhang·Aug 19, 2008SaveLearn
The Vertical Structure of Warm Ionised Gas in the Milky WayWe present a new joint analysis of pulsar dispersion measures and diffuse H-alpha emission in the Milky Way, which we use to derive the density, pressure and filling factor of the thick disk…B. M. Gaensler, G. J. Madsen, S. Chatterjee et al.·Aug 19, 2008SaveLearn
The Variable Stars of the Draco Dwarf Spheroidal Galaxy - RevisitedWe present a CCD survey of variable stars in the Draco dwarf spheroidal galaxy. This survey, which has the largest areal coverage since the original variable star survey by Baade & Swope, includes…K. Kinemuchi, H. C. Harris, Horace A. Smith et al.·Aug 19, 2008SaveLearn
Microlensing Optical Depth Revisited with Recent Star CountsMore reliable constraints on the microlensing optical depth comes from a better understanding of the Galactic model. Based on well-constrained Galactic bulge and disk models constructed from survey…Yoon-Hyun Ryu, Heon-Young Chang, Myeong-Gu Park et al.·Aug 19, 2008SaveLearn
Lighthouses with two lights: burst oscillations from the accretion-powered millisecond pulsarsThe key contribution of the discovery of nuclear-powered pulsations from the accretion-powered millisecond pulsars (AMPs) has been the establishment of burst oscillation frequency as a reliable proxy…Anna L. Watts·Aug 19, 2008SaveLearn
The AAT/WFI survey of the Monoceros Ring and Canis Major Dwarf galaxy: II. from l = (280 - 025)degThis paper concludes a systematic search for evidence of the Monoceros Ring and Canis Major dwarf galaxy around the Galactic Plane. Presented here are the results for the Galactic longitude range of…Blair C. Conn, Richard R. Lane, Geraint F. Lewis et al.·Aug 19, 2008SaveLearn
Sensitivity of PDR Calculations to Microphysical DetailsOur understanding of physical processes in Photodissociation regions or Photon Dominated Regions (PDRs) largely depends on the ability of spectral synthesis codes to reproduce the observed infrared…N. P. Abel, P. A. M. van Hoof, G. Shaw et al.·Aug 19, 2008SaveLearn
Deep Near-IR Surface Photometry of 57 Galaxies in the Local Sphere of InfluenceWe present H-band surface photometry of 57 galaxies drawn from the Local Sphere of Influence (LSI) with distances of less than 10 Mpc from the Milky Way. The images with a typical surface brightness…Emma Kirby, Helmut Jerjen, Stuart Ryder et al.·Aug 19, 2008SaveLearn
Telescopes versus Microscopes: the puzzle of Iron-60The discovery that the short-lived radionucleide iron-60 was present in the oldest meteorites suggests that the formation of the Earth closely followed the death of a massive star. I discuss three…Jonathan P. Williams·Aug 19, 2008SaveLearn