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Stability Constraints on Classical de Sitter Vacua
Stability Constraints Classical Sitter Vacua
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2011/10/17
We present further no-go theorems for classical de Sitter vacua in Type II string theory, i.e., de Sitter constructions that do not invoke non-perturbative effects or explicit supersymmetry breaking l...
In 2004, SGR 1806-20 underwent a period of intense and long-lasting burst activity that included the giant flare of 27 December 2004 -- the most intense extra-solar transient event ever detected at Ea...
Timing and spectral study of XB 1254-690 using new RXTE PCA data
accretion, accretion disks — methods: data analysis — stars: neutron— techniques: miscellaneous — X-rays: binaries — X-rays: individual
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2011/10/12
We have analyzed the new Rossi X-ray Timing Explorer Proportional Counter Array data of the atoll neutron star (NS) low-mass X-ray binary (LMXB) system XB 1254-690. The colour-colour diagram shows tha...
Infrared two-colour diagrams for AGB stars using AKARI, MSX, IRAS and NIR data
stars: AGB and post-AGB - circumstellar matter - infrared: stars - dust extinction - radiative transfer
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2011/10/12
Using a revised version of the catalog of AGB stars by Suh & Kwon (2009), we present various infrared two-colour diagrams (2CDs) for 3003 O-rich, 1168 C-rich, 362 S-type and 35 silicate carbon stars i...
The radio core of the Ultraluminous Infrared Galaxy F00183-7111: watching the birth of a quasar
radio continuum: galaxies-galaxies: evolution-galaxies: ULIRG-galaxies: active-VLBI
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2011/10/12
F00183-7111 is one of the most extreme Ultra-Luminous Infrared Galaxies known. Here we present a VLBI image which shows that F00183-7111 is powered by a combination of a radio-loud Active Galactic Nuc...
Excitation of the aromatic infrared emission bands: Chemical energy in hydrogenated amorphous carbon particles?
Excitation aromatic infrared emission bands: Chemical energy
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2011/10/11
We outline a model for the heating of hydrogenated amorphous (HAC) dust via the release of stored chemical energy and show that this energy (~12 kJ/mole) is sufficient to heat dust grains of classical...
Multimessenger astronomy with pulsar timing and X-ray observations of massive black hole binaries
Black hole physics – Accretion, accretion discs – Gravitational waves –pulsars: general – X-rays: general
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2011/10/9
We demonstrate that very massive (>10^8\msun), cosmologically nearby (z<1) black hole binaries (MBHBs), which are primary targets for ongoing and upcoming pulsar timing arrays (PTAs), are particularly...
A Search for Lyman Break Galaxies in the CDF-S Using Swift UVOT
Search Lyman Break Galaxies CDF-S Using Swift
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2011/10/12
While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. I...
The Be/X-ray binary A0535+26 during its recent 2009/2010 outbursts
Be/X-ray binary A0535+26 during recent 2009/2010 outbursts
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2011/10/10
The Be/X-ray binary A0535+26 showed a giant outburst in December 2009 that reached ~5.14 Crab in the 15-50 keV range. Unfortunately, due to Sun constraints it could not be observed by most X-ray satel...
Measurement of Cosmic Ray antiproton/proton flux ratio at TeV energies with ARGO-YBJ
Extensive Air Showers Cosmic Rays Moon shadow antiproton ARGO-YBJ
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2011/10/10
Cosmic ray antiprotons provide an important probe for the study of cosmic-ray propagation in the interstellar space and to investigate the existence of Galactic dark matter. The ARGO-YBJ experiment, l...
A view of the narrow-line region in the infrared: active galactic nuclei with resolved fine-structure lines in the Spitzer archive
narrow-line region infrared: active galactic nuclei resolved fine-structure lines
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2011/10/10
We queried the Spitzer archive for high-resolution observations with the Infrared Spectrograph of optically selected active galactic nuclei (AGN) for the purpose of identifying sources with resolved f...
A Spitzer IRS Survey of NGC 1333: Insights into disk evolution from a very young cluster
Spitzer IRS Survey Insights evolution cluster
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2011/10/10
We report on the {\lambda} = 5-36{\mu}m Spitzer Infrared Spectrograph spectra of 79 young stellar objects in the very young nearby cluster NGC 1333. NGC 1333's youth enables the study of early protopl...
A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part I)
Bayesian Approach Locating Giant Branch Tip Magnitu
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2011/10/10
We present a new approach for identifying the Tip of the Red Giant Branch (TRGB) which, as we show, works robustly even on sparsely populated targets. Moreover, the approach is highly adaptable to the...
Gas Gain Measurements from a Negative Ion TPC X-ray Polarimeter
Gas Gain Measurements Negative TPC X-ray Polarimeter
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2011/10/9
Gas-based time projection chambers (TPCs) have been shown to be highly sensitive X-ray polarimeters having excellent quantum efficiency while at the same time achieving large modulation factors. To ob...
The relation of optical/UV and X-ray emission in low-luminosity active galactic nuclei
relation optical/UV X-ray emission low-luminosity active galactic nuclei
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2011/10/9
We study the relation of optical/UV and X-ray emission in the low luminosity active galactic nuclei (LLAGNs), using a sample of 49 sources including 28 local Seyfert galaxies and 21 low-ionization nuc...