Search Publications
Survey of caveats in low-energy particle measurements: Ulysses/HI-SCALE and ACE/EPAM Instruments
Malandraki, O. E.; Anagnostopoulos, G. C.; Marhavilas, P. K.
"Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies" (HI-SCALE) onboard the ULYSSES spacecraft, and "Electron, Proton, and Alpha Monitor" (EPAM) onboard the ACE spacecraft, are very similar instruments and were designed to make measurements of ions and electrons over a broad range of energy and intensity. The ions (E
Discovery of a nearby early-phase major cluster merger CIZA J1358.9-4750
Makishima, Kazuo; Nakazawa, Kazuhiro; Gu, Liyi +4 more
CIZA J1358.9-4750 is a nearby (z = 0.074) pair of clusters of galaxies located close to the Galactic plane. It consists of two X-ray extended humps at the northwest and the southeast separated by 14' (∼ 1.2 Mpc), and an X-ray bright bridgelike structure in between. With Suzaku, the south east hump was shown to have a temperature of 5.6 ± 0.2 keV a…
Line-depth-ratio temperatures for the close binary ν Octantis: new evidence supporting the conjectured circumstellar retrograde planet
Ramm, D. J.
We explore the possibly that either star-spots or pulsations are the cause of a periodic radial velocity (RV) signal (P ∼ 400 d) from the K-giant binary ν Octantis (P ∼ 1050 d, e ∼ 0.25), alternatively conjectured to have a retrograde planet. Our study is based on temperatures derived from 22 line-depth ratios (LDRs) for ν Oct and 20 calibration s…
Corrugated velocity patterns in the spiral galaxies: NGC 278, NGC 1058, NGC 2500 & UGC 3574
Pérez, Enrique; Alfaro, Emilio J.; Sánchez-Gil, M. Carmen
We address the study of the H α vertical velocity field in a sample of four nearly face-on galaxies using long-slit spectroscopy taken with the Intermediate dispersion Spectrograph and Imaging System (ISIS), attached to the William Herschel Telescope (WHT) at the Roque de los Muchachos Observatory (Spain). The spatial structure of the velocity ver…
Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko
Thomas, N.; Brouet, Y.; Encrenaz, P. +4 more
Aims: Permittivity measurements on porous samples of volcanic origin have been performed in the 0.05-190 GHz range under laboratory conditions in support of the Rosetta mission to comet 67P/Churyumov-Gerasimenko, specifically with the MIRO radiometric experiment and CONSERT radar experiment.
Methods: The samples were split into several s…
A Multiwavelength Study of Tadpole Galaxies in the Hubble Ultra Deep Field
Ravindranath, Swara; de Mello, Duilia; Gardner, Jonathan P. +6 more
Multiwavelength data are essential in order to provide a complete picture of galaxy evolution and to inform studies of galaxies’ morphological properties across cosmic time. Here we present the results of a multiwavelength investigation of the morphologies of “tadpole” galaxies at intermediate redshift (0.314 < z < 3.175) in the Hubble Ultra…
Non-LTE modelling of prominence fine structures using hydrogen Lyman-line profiles
Curdt, W.; Gunár, S.; Schwartz, P.
Aims: We perform a detailed statistical analysis of the spectral Lyman-line observations of the quiescent prominence observed on May 18, 2005.
Methods: We used a profile-to-profile comparison of the synthetic Lyman spectra obtained by 2D single-thread prominence fine-structure model as a starting point for a full statistical analysis of …
Simulating Deep Hubble Images with Semi-empirical Models of Galaxy Formation
White, Richard L.; Fall, S. Michael; Szalay, Alexander S. +1 more
We simulate deep images from the Hubble Space Telescope (HST) using semi-empirical models of galaxy formation with only a few basic assumptions and parameters. We project our simulations all the way to the observational domain, adding cosmological and instrumental effects to the images, and analyze them in the same way as real HST images ("forward…
A Multiwavelength Study of Three Hybrid Blazars
Marshall, H. L.; Kharb, P.; Lister, M. L. +3 more
We present multiwavelength imaging observations of PKS 1045-188, 8C 1849+670, and PKS 2216-038, three radio-loud active galactic nuclei from the MOJAVE-Chandra Sample that straddle the Fanaroff-Riley (FR) boundary between low- and high-power jets. These hybrid sources provide an excellent opportunity to study jet emission mechanisms and the influe…
The naked nuclei of low ionization nuclear emission line regions
Capetti, Alessandro; Balmaverde, Barbara
We analyze HST spectra and Chandra observations of a sample of 21 low ionization nuclear emission line regions (LINERs), at least 18 of which genuine active galactic nuclei. We find a correlation between the X-rays and emission lines luminosities, extending over three orders of magnitude and with a dispersion of 0.36 dex; no differences emerge bet…