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Astrophysics papers — page 24

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The Slitless Spectroscopy Data Extraction Software aXe
The methods and techniques for the slitless spectroscopy software aXe, which was designed to reduce data from the various slitless spectroscopy modes of Hubble Space Telescope instruments, are…
Martin Kümmel, Jeremy Walsh, Norbert Pirzkal et al.Dec 8, 2008
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The spatial distribution of star and cluster formation in M51
Aims. We study the connection between spatially resolved star formation and young star clusters across the disc of M51. Methods. We combine star cluster data based on B, V, and I-band Hubble Space…
R. A. Scheepmaker, H. J. G. L. M. Lamers, P. Anders et al.Dec 8, 2008
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Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716 + 714
We present the result of near-infrared and optical observations of the BL Lac object S5 0716 + 714 carried out by the KANATA telescope. S5 0716 + 714 has both a long term high-amplitude…
Mahito Sasada, Makoto Uemura, Akira Arai et al.Dec 8, 2008
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Inflationary predictions at small gamma
This paper explores single field inflation models with a constant, but arbitrary speed of sound cs, obtained by deforming the kinetic energy terms to a Dirac-Born-Infeld form. Allowing cs<1…
Ewa CzuchryDec 8, 2008
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B2 0902+34: A Collapsing Protogiant Elliptical Galaxy at z=3.4
We have used the visible integral-field replicable unit spectrograph prototype (VIRUS-P), a new integral field spectrograph, to study the spatially and spectrally resolved Lyman-alpha emission line…
Joshua J Adams, Gary J. Hill, Phillip J. MacQueenDec 8, 2008
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Instability of the ACW model, and problems with massive vectors during inflation
We prove that the anisotropic inflationary background of the Ackerman-Carroll-Wise model, characterized by a fixed-norm vector field, is unstable. We found the instability by explicitly solving the…
Burak Himmetoglu, Carlo R. Contaldi, Marco PelosoDec 8, 2008
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Observing the r-Process Signature in the Oldest Stars
The abundance patterns of metal-poor stars provide us a wealth of chemical information about various stages of the chemical evolution of the Galaxy. In particular, these stars allow us to study the…
Anna FrebelDec 8, 2008
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Galactic vs. Extragalactic Origin of the Peculiar Transient SCP 06F6
We study four scenarios for the SCP 06F6 transient event that was announced recently. Some of these were previously briefly discussed as plausible models for SCP 06F6, in particular with the claimed…
Noam Soker, Adam Frankowski, Amit KashiDec 7, 2008
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The mass function of young star clusters in spiral galaxies
The initial cluster mass function (ICMF) in spiral galaxy discs is constrained and compared with data for old globular clusters and young clusters in starbursts. It is found that the observed ages…
S. S. LarsenDec 7, 2008
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The cosmological background of vector modes
We investigate the spectrum of vector modes today which is generated at second order by density perturbations. The vector mode background that is generated by structure formation is small but in…
Teresa Hui-Ching Lu, Kishore Ananda, Chris Clarkson et al.Dec 7, 2008
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Minimum mass of galaxies from BEC or scalar field dark matter
Many problems of cold dark matter models such as the cusp problem and the missing satellite problem can be alleviated, if galactic halo dark matter particles are ultra-light scalar particles and in…
Jae-Weon Lee, Sooil LimDec 7, 2008
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Apparent shape of super-spinning black holes
We consider the possibility that astrophysical Black Holes (BHs) can violate the Kerr bound; i.e., they can have angular momentum greater than BH mass, J > M. We discuss implications on the BH…
Cosimo Bambi, Katherine FreeseDec 7, 2008
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Fate of baby radio galaxies: Dead or Alive ?
In order to reveal the long-term evolution of relativistic jets in active galactic nuclei (AGNs), we examine the dynamical evolution of variously-sized radio galaxies [i.e., compact symmetric objects…
Nozomu Kawakatu, Hiroshi Nagai, Motoki KinoDec 7, 2008
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Intermittent accreting millisecond pulsars: light houses with broken lamps?
Intermittent accreting millisecond X-ray pulsars are an exciting new type of sources. Their pulsations appear and disappear either on timescales of hundreds of seconds or on timescales of days. The…
D. Altamirano, P. CasellaDec 7, 2008
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The high-energy emission from GX 339-4 as seen with INTEGRAL and XMM-Newton
GX 339--4 is a well-known microquasar. In this contribution we show the obtained results with the INTEGRAL and XMM-Newton observatories of the outburst undertaken on 2007. The observations cover…
M. D. Caballero-Garcia, J. M. Miller, A. C. FabianDec 7, 2008
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Circumstellar water vapour in M-type AGB stars: Constraints from H2O(110 - 101) lines obtained with Odin
Aims: Spectrally resolved circumstellar H2O(110 - 101) lines have been obtained towards three M-type AGB stars using the Odin satellite. This provides additional strong constrains on the properties…
M. Maercker, F. L. Schoeier, H. Olofsson et al.Dec 7, 2008
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Exploring the disk-jet connection from the properties of narrow line regions in powerful young radio-loud AGNs
We investigate the optical emission-line flux ratios of narrow-line regions, in order to determine whether the formation of AGN jets requires specific accretion conditions. We find that bright…
Nozomu Kawakatu, Tohru Nagao, Jong-Hak WooDec 7, 2008
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Star Formation in the Orion Nebula I: Stellar Content
The Orion Nebula is one of the most frequently observed nearby (<1 kiloparsec) star forming regions and, consequently, the subject of a large bibliography of observations and interpretation. The…
August Muench, Konstantin Getman, Lynne Hillenbrand et al.Dec 7, 2008
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Expected Planet and False Positive Detection Rates for the Transiting Exoplanet Survey Satellite
The proposed Transiting Exoplanet Survey Satellite (TESS) will survey the entire sky to locate the nearest and brightest transiting extrasolar planets with orbital periods up to about 36 days. Here…
Timothy M. Brown, David W. LathamDec 7, 2008
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The Ks-band Tully-Fisher Relation - A Determination of the Hubble Parameter from 218 ScI Galaxies and 16 Galaxy Clusters
The value of the Hubble Parameter (H0) is determined using the morphologically type dependent Ks-band Tully-Fisher Relation (K-TFR). The slope and zero point are determined using 36 calibrator…
David G. RussellDec 6, 2008
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Multiple scattering of waves by a pair of gravitationally stratified flux tubes
We study the near-field coupling of a pair of flux tubes embedded in a gravitationally stratified environment. The mutual induction of the near-field jackets of the two flux tubes can…
Shravan M. Hanasoge, Paul S. CallyDec 6, 2008
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Radial Velocity Studies of Close Binary Stars. XV
Radial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for the last eight close binary systems analyzed the same way as in the previous papers of…
T. Pribulla, S. M. Rucinski, R. M. Blake et al.Dec 6, 2008
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Redshifts and lens profile for the double quasar QJ 0158-4325
We report on the redshift of the lensing galaxy and of the quasar QJ 0158-4325 and on the lens model of the system. A deep VLT/FORS2 spectrum and HST/NICMOS-F160W images are deconvolved. From the…
C. Faure, T. Anguita, A. Eigenbrod et al.Dec 6, 2008
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Secular evolution of viscous and self-gravitating circumstellar discs
We add the effect of turbulent viscosity via the α-prescription to models of the self-consistent formation and evolution of protostellar discs. Our models are non-axisymmetric and carried out using…
E. I. Vorobyov, Shantanu BasuDec 6, 2008
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SDSS J162718.39+120435.0 - a dwarf nova in the period gap
SDSS J162718.39+120435.0 was suspected of being a dwarf nova from spectroscopic observations made available by the Sloan Digital Sky Survey. Photometry conducted during the 2008 outburst, the first…
Jeremy Shears, Steve Brady, Boris Gaensicke et al.Dec 6, 2008
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