Search Publications
Internal structure of a coronal mass ejection revealed by Akatsuki radio occultation observations
Isobe, H.; Imamura, T.; Häusler, B. +6 more
A coronal mass ejection (CME) was observed at the heliocentric distance of 12.7 Rυ by radio occultation measurements using the Akatsuki spacecraft. The temporal developments of the bulk velocity and the electron column density along the raypath traversing the CME were obtained, and under the assumption that the irregularities are transp…
Cold parsec-scale gas in a zabs ∼ 0.1 sub-damped Lyman α with disparate H2 and 21-cm absorption
Momjian, E.; Muzahid, S.; Srianand, R. +3 more
We present a detailed analysis of a H2-bearing metal-rich sub-damped Lyman α system at zabs = 0.10115 towards the radio-loud quasar J0441-4313, at a projected separation of ∼7.6 kpc from a star-forming galaxy. The H2, {C I}} and {Na I} absorption are much stronger in the redder of the two components seen in the Hub…
Long-term XMM-Newton investigation of two particle-accelerating colliding-wind binaries in NGC 6604: HD 168112 and HD 167971
De Becker, M.
The long-term (over more than one decade) X-ray emission from two massive stellar systems known to be particle accelerators is investigated using XMM-Newton. Their X-ray properties are interpreted taking into account recent information about their multiplicity and orbital parameters. The two targets, HD 168112 and HD 167971, appear to be overlumin…
XMM-Newton and optical observations of the eclipsing polar CSS081231:071126+440405
Schwope, A. D.; Worpel, H.
Aims: We aim to study the temporal and spectral behaviour of the eclipsing polar CSS081231:071126+440405 from the infrared to the X-ray regimes.
Methods: We obtained phase-resolved XMM-Newton X-ray observations on two occasions in 2012 and 2013 in different states of accretion. In 2013 the XMM-Newton X-ray and UV data were complemented b…
The Quasar-LBG Two-point Angular Cross-correlation Function at z~4 in the COSMOS Field
Sanders, D. B.; Taniguchi, Y.; Salvato, M. +15 more
In order to investigate the origin of quasars, we estimate the bias factor for low-luminosity quasars at high redshift for the first time. In this study, we use the two-point angular cross-correlation function (CCF) for both low-luminosity quasars at -24\lt {M}1450\lt -22 and Lyman-break galaxies (LBGs). Our sample consists of both 25 l…
Study of extremely reddened AGB stars in the Galactic bulge
Engels, D.; Jiménez-Esteban, F. M.
Context. Extremely reddened asymptotic giant branch stars (AGB) lose mass at high rates of >10-5 M⊙ yr-1. This is the very last stage of AGB evolution, in which stars in the mass range ~2.0-4.0 M⊙ (for solar metallicity) should have been converted to C stars already. The extremely reddened AGB stars i…
Search for satellites near comet 67P/Churyumov-Gerasimenko using Rosetta/OSIRIS images
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Context. TheEuropean Space Agency Rosetta mission reached and started escorting its main target, the Jupiter-family comet 67P/Churyumov-Gerasimenko, at the beginning of August 2014. Within the context of solar system small bodies, satellite searches from approaching spacecraft were extensively used in the past to study the nature of the visited bo…
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…