A Coherence-Based Approach for Tracking Waves in the Solar CoronaWe consider the problem of automatically (and robustly) isolating and extracting information about waves and oscillations observed in EUV image sequences of the solar corona with a view to near…Scott W. McIntosh, Bart De Pontieu, Steven Tomczyk·Aug 21, 2008SaveLearn
A Comparative Study Between Eruptive X-class Flares Associated with Coronal Mass Ejections and Confined X-class FlaresWe examine the two kinds of major energetic phenomena that occur in the solar atmosphere: eruptive and confined events. The former describes flares with associated coronal mass ejections (CMEs),…Yuming Wang, Jie Zhang·Aug 21, 2008SaveLearn
An Improved Technique for Measurement of Cold HI in Molecular Cloud CoresThe presence of atomic gas mixed with molecular species in a "molecular" cloud may significantly affect its chemistry, the excitation of some species, and can serve as probe of the…Marko Krco, Paul F. Goldsmith, Robert L. Brown et al.·Aug 21, 2008SaveLearn
SMA observations of Infrared Dark Clouds: A tale of two coresWe present high-angular resolution sub-millimeter continuum images and molecular line spectra obtained with the SMA toward two massive cores that lie within Infrared Dark Clouds; one actively…J. M. Rathborne, J. M. Jackson, Q. Zhang et al.·Aug 21, 2008SaveLearn
A Statistical Study on Solar Active Regions Producing Extremely Fast Coronal Mass EjectionsWe present a statistical result on the properties of solar source regions that have produced 57 fastest front-side coronal mass ejections (CMEs) (speed 1500 km/s) occurred from 1996 June to 2007…Yuming Wang, Jie Zhang·Aug 21, 2008SaveLearn
Assessing potential cluster Cepheids from a new distance and reddening parameterization and 2MASS photometryA framework is outlined to assess Cepheids as potential cluster members from readily available photometric observations. A relationship is derived to estimate colour excess and distance for…Daniel J. Majaess, David G. Turner, David J. Lane·Aug 21, 2008SaveLearn
Low-Mass and Metal-Poor Gamma-Ray Burst Host GalaxiesGamma-ray bursts (GRBs) are cosmologically distributed, very energetic and very transient sources detected in the gamma-ray domain. The identification of their x-ray and optical afterglows allowed so…Sandra Savaglio·Aug 21, 2008SaveLearn
Radio emission from exoplanets: the role of the stellar coronal density and magnetic field strengthThe search for radio emission from extra-solar planets has so far been unsuccessful. Much of the effort in modelling the predicted emission has been based on the analogy with the well-known emission…M. Jardine, A. C. Cameron·Aug 21, 2008SaveLearn
A novel multi-frequency technique for the detection of point sources in Cosmic Microwave Background mapsIn this work we address the problem of simultaneous multi-frequency detection of extragalactic point sources in maps of the Cosmic Microwave Background. We apply a new linear filtering technique, the…D. Herranz, M. Lopez-Caniego, J. L. Sanz et al.·Aug 21, 2008SaveLearn
Low angular momentum flow model of Sgr A* activitySgr A* is the closest massive black hole and can be observed with the highest angular resolution. Nevertheless, our current understanding of the accretion process in this source is very poor. The…B. Czerny, M. Moscibrodzka·Aug 21, 2008SaveLearn
Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar OrbitsWe report new precision measurements of the properties of our Galaxy's supermassive black hole. Based on astrometric (1995-2007) and radial velocity (2000-2007) measurements from the W. M. Keck…A. M. Ghez, S. Salim, N. N. Weinberg et al.·Aug 21, 2008SaveLearn
Status of Very High Energy gamma-ray Astronomy as of early 2008Data obtained in the very high energy gamma-ray band with the new generation of imaging telescopes, in particular through the galactic plane survey undertaken by H.E.S.S., low threshold observations…Arache Djannati-Atai·Aug 21, 2008SaveLearn
Analysis of MDI High-Degree Mode Frequencies and their Rotational SplittingsHere we present a detailed analysis of solar acoustic mode frequencies and their rotational splittings for modes with degree up to 900. They were obtained by applying spherical harmonic decomposition…M. C. Rabello-Soares, S. G. Korzennik, J. Schou·Aug 21, 2008SaveLearn
A Bitter Pill: The Primordial Lithium Problem WorsensThe lithium problem arises from the significant discrepancy between the primordial 7Li abundance as predicted by BBN theory and the WMAP baryon density, and the pre-Galactic lithium abundance…Richard H. Cyburt, Brian D. Fields, Keith A. Olive·Aug 21, 2008SaveLearn
Planet-bound dark matter and the internal heat of Uranus, Neptune, and hot-Jupiter exoplanetsWe suggest that accretion of planet-bound dark matter by the Jovian planets, and by hot-Jupiter exoplanets, could be a significant source of their internal heat. The anomalously low internal heat of…Stephen L. Adler·Aug 20, 2008SaveLearn
Is there an upper limit to black hole masses?We make a case for the existence for ultra-massive black holes (UMBHs) in the Universe, but argue that there exists a likely upper limit to black hole masses of the order of M 1010 .…Priyamvada Natarajan, Ezequiel Treister·Aug 20, 2008SaveLearn
High energy neutrinos from charm in astrophysical sourcesCharm production gives rise to a flux of very high energy neutrinos from astrophysical sources with jets driven by central engines, such as gamma ray bursts or supernovae with jets. The neutrino flux…Rikard Enberg, Mary Hall Reno, Ina Sarcevic·Aug 20, 2008SaveLearn
Worlds Beyond: A Strategy for the Detection and Characterization of ExoplanetsThis is a scientific strategy for the detection and characterization of extrasolar planets; that is, planets orbiting other stars. As such, it maps out over a 15-year horizon the techniques and…J. I. Lunine, D. Fischer, H. Hammel et al.·Aug 20, 2008SaveLearn
A discontinuity in the low-mass IMF - the case of high multiplicityThe empirical binary properties of brown dwarfs (BDs) differ from those of normal stars suggesting BDs form a separate population. Recent work by Thies & Kroupa revealed a discontinuity of the…I. Thies, P. Kroupa·Aug 20, 2008SaveLearn
Effects of Supernova Feedback on the Formation of GalaxiesWe study the effects of Supernova (SN) feedback on the formation of galaxies using hydrodynamical simulations in a Lambda-CDM cosmology. We use an extended version of the code GADGET-2 which includes…Cecilia Scannapieco, Patricia B. Tissera, Simon D. M. White et al.·Aug 20, 2008SaveLearn
On the dangers of using the growth equation on large scales in the Newtonian gaugeWe examine the accuracy of the growth equation δ + 2Hδ - 4πGρδ= 0, which is ubiquitous in the cosmological literature, in the context of the Newtonian gauge. By comparing the growth…James B. Dent, Sourish Dutta·Aug 20, 2008SaveLearn
HAWK-I imaging of the X-ray luminous galaxy cluster XMMU J2235.3-2557: The red sequence at z=1.39We use HAWK-I, the recently-commissioned near-IR imager on Yepun (VLT-UT4), to obtain wide-field, high-resolution images of the X-ray luminous galaxy cluster XMMU J2235.3-2557 in the J and Ks bands,…C. Lidman, P. Rosati, M. Tanaka et al.·Aug 20, 2008SaveLearn
The nature of faint Spitzer-selected dust-obscured galaxiesWe use deep far-IR, submm, radio and X-ray imaging and mid-IR spectroscopy to explore the nature of a sample of Spitzer-selected dust-obscured galaxies (DOGs) in GOODS-N. A sample of 79 galaxies…Alexandra Pope, R. Shane Bussmann, Arjun Dey et al.·Aug 20, 2008SaveLearn
Tracing high density gas in M 82 and NGC 4038We present the first detection of CS in the Antennae galaxies towards the NGC 4038 nucleus, as well as the first detections of two high-J (5-4 and 7-6) CS lines in the center of M 82. The CS(7-6)…E. Bayet, C. Lintott, S. Viti et al.·Aug 20, 2008SaveLearn
Another forbidden solar oxygen abundance: the [O I] 5577 A lineContext: Recent works with improved model atmospheres, line formation, atomic and molecular data, and detailed treatment of blends, have resulted in a significant downward revision of the solar…Jorge Melendez, Martin Asplund·Aug 20, 2008SaveLearn