Search Publications
Observations of supergiant fast X-ray transients with LOFT
Esposito, P.; Romano, P.; Ferrigno, C. +2 more
Supergiant fast X-ray transients are a subclass of high mass X-ray binaries displaying a peculiar and still poorly understood extreme variability in the X-ray domain. These sources undergo short sporadic outbursts (L∼ 1036-1037 erg s-1), lasting few ks at the most, and spend a large fraction of their tim…
HerMES: A Deficit in the Surface Brightness of the Cosmic Infrared Background due to Galaxy Cluster Gravitational Lensing
Kneib, J. -P.; Valtchanov, I.; Clements, D. L. +25 more
We have observed four massive galaxy clusters with the SPIRE instrument on the Herschel Space Observatory and measure a deficit of surface brightness within their central region after removing detected sources. We simulate the effects of instrumental sensitivity and resolution, the source population, and the lensing effect of the clusters to estim…
The detection of FIR emission from high-redshift star-forming galaxies in the ECDF-S
Bremer, M. N.; Lehnert, M. D.; Davies, L. J. M. +1 more
We have used the Large Apex Bolometer Camera Survey of the Extended Chandra Deep Field South to investigate rest-frame far-infrared (FIR) emission from typical star-forming systems (Lyman-break galaxies, LBGs, and Lyman α emitters, LAEs) at redshift 3, 4, 4.5 and 5 (922, 68, 46 and 20 sources, respectively). We initially concentrate on LBGs at z ∼…
Long-term multiwavelength studies of high-redshift blazar 0836+710
Akyuz, A.; Thompson, D. J.; Zensus, J. A. +7 more
Aims: The observation of γ-ray flares from blazar 0836+710 in 2011, following a period of quiescence, offered an opportunity to study correlated activity at different wavelengths for a high-redshift (z = 2.218) active galactic nucleus.
Methods: Optical and radio monitoring, plus Fermi-LAT γ-ray monitoring provided 2008-2012 coverage, whi…
Nature of Quiet Sun Oscillations Using Data from the Hinode, TRACE, and SOHO Spacecraft
Doyle, J. G.; Madjarska, M. S.; Gupta, G. R. +2 more
We study the nature of quiet-Sun oscillations using multi-wavelength observations from TRACE, Hinode, and SOHO. The aim is to investigate the existence of propagating waves in the solar chromosphere and the transition region by analyzing the statistical distribution of power in different locations, e.g. in bright magnetic (network), bright non-mag…
The Origin of the 6.4 keV Line Emission and H2 Ionization in the Diffuse Molecular Gas of the Galactic Center Region
Terrier, R.; Tatischeff, V.; Chernyshov, D. O. +2 more
We investigate the origin of the diffuse 6.4 keV line emission recently detected by Suzaku and the source of H2 ionization in the diffuse molecular gas of the Galactic center (GC) region. We show that Fe atoms and H2 molecules in the diffuse interstellar medium of the GC are not ionized by the same particles. The Fe atoms are…
Directionality and variability of energetic neutral hydrogen fluxes observed by Mars Express
Barabash, S.; Futaana, Y.; Grigoriev, A. +2 more
Using data collected by the neutral particle detector of the analyzer of space plasmas and energetic atoms on board Mars Express, we establish the global morphology of hydrogen energetic neutral atom (ENA) fluxes. The observations were conducted in March-July 2004 and reveal that low flux ENAs (<5×105cm-2s-1sr
Late-time Dust Emission from the Type IIn Supernova 1995N
Van Dyk, Schuyler D.
Type IIn supernovae (SNe IIn) have been found to be associated with significant amounts of dust. These core-collapse events are generally expected to be the final stage in the evolution of highly massive stars, either while in an extreme red supergiant phase or during a luminous blue variable phase. Both evolutionary scenarios involve substantial …
Very Low Mass Stellar and Substellar Companions to Solar-like Stars from MARVELS. IV. A Candidate Brown Dwarf or Low-mass Stellar Companion to HIP 67526
Bizyaev, Dmitry; Brewington, Howard; Ebelke, Garrett +50 more
We report the discovery of a candidate brown dwarf (BD) or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object Apache point observatory Radial Velocity Exoplanet Large-area Survey (MARVELS). The radial velocity curve for this object contains 31 epochs spread over 2.5 yr. Our Keplerian fit, using a Markov Chai…
Water Ice in High Mass-loss Rate OH/IR Stars
Suh, Kyung-Won; Kwon, Young-Joo
We investigate water-ice features in spectral energy distributions (SEDs) of high mass-loss rate OH/IR stars. We use a radiative transfer code which can consider multiple components of dust shells to make model calculations for various dust species including water ice in the OH/IR stars. We find that the model SEDs are sensitively dependent on the…