Search Publications
Astrometrically Registered Simultaneous Observations of the 22 GHz H2O and 43 GHz SiO Masers toward R Leonis Minoris Using KVN and Source/Frequency Phase Referencing
Byun, Do-Young; Kim, Jongsoo; Kim, Kee-Tae +22 more
Oxygen-rich asymptotic giant branch (AGB) stars can be intense emitters of SiO (v = 1 and 2, J = 1 → 0) and H2O maser lines at 43 and 22 GHz, respectively. Very long baseline interferometry (VLBI) observations of the maser emission provide a unique tool to probe the innermost layers of the circumstellar envelopes in AGB stars. Neverthel…
The Secret Lives of Cepheids: Evolutionary Changes and Pulsation-induced Shock Heating in the Prototype Classical Cepheid δ Cep
Harper, Graham M.; Guinan, Edward F.; Engle, Scott G. +2 more
Over the past decade, the Secret Lives of Cepheids (SLiC) program has been carried out at Villanova University to study aspects and behaviors of classical Cepheids that are still not well understood. In this, the first of several planned papers on program Cepheids, we report the current results for δ Cep, the Cepheid prototype. Ongoing photometry …
Surface albedo spectral properties of geologically interesting areas on Titan
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +13 more
We investigate the nature and possible formation processes of three areas on Titan's surface which have been suggested as geologically interesting: Hotei Regio, Tui Regio, and Sotra Patera. We also reanalyze the spectral characteristics of the Huygens Landing Site. We apply a statistical Principal Component Analysis (PCA) and a radiative transfer …
GRASIL-3D: an implementation of dust effects in the SEDs of simulated galaxies
Granato, G. L.; Silva, L.; Domínguez-Tenreiro, R. +5 more
We introduce a new model for the spectral energy distribution of galaxies, GRASIL-3D, which includes a careful modelling of the dust component of the interstellar medium. GRASIL-3D is an entirely new model based on the formalism of an existing and widely applied spectrophotometric model, GRASIL, but specifically designed to be interfaced with gala…
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift
Yershov, V. N.
Two UV serendipitous source catalogues are presented which were compiled based on the observations with two similar UV telescopes, one being on-board the ESA's XMM Newton observatory and another—on-board the NASA's Swift satellite. Both telescopes have similar optical and registration systems providing photometry in three ultraviolet and three vis…
Suzaku Studies of the Central Engine in the Typical Type I Seyfert NGC 3227: Detection of Multiple Primary X-Ray Continua with Distinct Properties
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +3 more
The type I Seyfert galaxy NGC 3227 was observed by Suzaku six times in 2008, with intervals of ~1 week and net exposures of ~50 ks each. Among the six observations, the source varied by nearly an order of magnitude; it was brightest in the first observation with a 2-10 keV luminosity of 1.2 × 1042 erg s-1, while faintest in t…
A compact, metal-rich, kpc-scale outflow in FBQS J0209-0438: detailed diagnostics from HST/COS extreme UV observations
Done, Chris; Hamann, Fred; Tejos, Nicolas +6 more
We present HST/COS observations of highly ionized absorption lines associated with a radio-loud quasar (QSO) at z = 1.1319. The absorption system has multiple velocity components, with an overall width of ≈600 km s-1, tracing gas that is largely outflowing from the QSO at velocities of a few 100 km s-1. There is an unpreceden…
Stellar laboratories. III. New Ba v, Ba vi, and Ba vii oscillator strengths and the barium abundance in the hot white dwarfs G191-B2B and RE 0503-289
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Context. For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation.
Aims: Reliable Ba v-vii oscillator streng…
Cassini-VIMS observations of Saturn's main rings: I. Spectral properties and temperature radial profiles variability with phase angle and elevation
Brown, R. H.; Clark, R. N.; Nicholson, P. D. +10 more
The spectral properties and thermal behavior of Saturn's rings are determined from a dataset of ten radial mosaics acquired by Cassini-VIMS (Visual and Infrared Mapping Spectrometer) between October 29th 2004 and January 27th 2010 with phase angle ranging between 5.7° and 132.4° and elevation angles between -23.5° and 2.6°. These observations, aft…
A Comparison of the Morphological Properties between Local and z ~ 1 Infrared Luminous Galaxies: Are Local and High-z (U)LIRGs Different?
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Sanders, D. B. +9 more
Ultraluminous and luminous infrared galaxies (ULIRGs and LIRGs) are the most extreme star-forming galaxies in the universe and dominate the total star formation rate density at z > 1. In the local universe (z < 0.3), the majority of ULIRGs and a significant portion of LIRGs are triggered by interactions between gas-rich spiral galaxies, yet …