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The astrometric Gaia-FUN-SSO observation campaign of 99942 Apophis
Sakamoto, T.; Colas, F.; Bikmaev, I. +71 more
Aims: Astrometric observations performed by the Gaia Follow-Up Network for Solar System Objects (Gaia-FUN-SSO) play a key role in ensuring that moving objects first detected by ESA's Gaia mission remain recoverable after their discovery. An observation campaign on the potentially hazardous asteroid (99 942) Apophis was conducted during the as…
Systematic Variations in CO2/H2O Ice Abundance Ratios in Nearby Galaxies Found with AKARI Near-infrared Spectroscopy
Oyabu, S.; Onaka, T.; Kaneda, H. +4 more
We report CO2/H2O ice abundance ratios in seven nearby star-forming galaxies based on the AKARI near-infrared (2.5-5.0 µm) spectra. The CO2/H2O ice abundance ratios show clear variations between 0.05 and 0.2 with the averaged value of 0.14 ± 0.01. The previous study on M82 revealed that the CO…
Constraining the Baryon Fraction in the Warm Hot Intergalactic Medium at Low Redshifts with Planck Data
Atrio-Barandela, F.; Mücket, J. P.; Génova-Santos, R. +1 more
We cross-correlate foreground cleaned Planck Nominal cosmic microwave background (CMB) maps with two templates constructed from the Two-Micron All-Sky Redshift Survey of galaxies. The first template traces the large-scale filamentary distribution characteristic of the Warm-Hot Intergalactic Medium (WHIM) out to ∼ 90 {{h}-1} Mpc. The sec…
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 …