Search Publications

Statistics of the fractional polarization of compact radio sources in Planck maps

Toffolatti, Luigi; Bonavera, Laura; González-Nuevo, Joaquin +1 more

In this work, we apply the stacking technique to estimate the average fractional polarization from 30 to 353 GHz of a primary sample of 1560 compact sources - essentially all radio sources - detected in the 30 GHz Planck all-sky map and listed in the second version of the Planck Catalogue of Compact Sources (PCCS2). We divide our primary sample in…

Multiband study of RX J0838-2827 and XMM J083850.4-282759: a new asynchronous magnetic cataclysmic variable and a candidate transitional millisecond pulsar

D'Avanzo, P.; Campana, S.; Ribas, I. +23 more

In a search for the counterpart to the Fermi-LAT source 3FGL J0838.8-2829, we performed a multiwavelength campaign: in the X-ray band with Swift and XMM-Newton; in the infrared and optical with OAGH, ESO-NTT and IAC80; and in the radio with ATCA observations. We also used archival hard X-ray data obtained by INTEGRAL. We report on three X-ray sour…

An extension of the Planck galaxy cluster catalogue

Burenin, R. A.

We present a catalogue of galaxy clusters detected in the Planck all-sky Compton parameter maps and identified using data from the WISE and SDSS surveys. The catalogue comprises about 3000 clusters in the SDSS fields. We expect the completeness of this catalogue to be high for clusters with masses larger than M ₅₀₀ ≈ 3 × 10¹⁴…

Triggering Process of the X1.0 Three-ribbon Flare in the Great Active Region NOAA 12192

Kusano, Kanya; Shiota, Daikou; Inoue, Satoshi +1 more

The solar magnetic field in a flare-producing active region (AR) is much more complicated than theoretical models, which assume a very simple magnetic field structure. The X1.0 flare, which occurred in AR 12192 on 2014 October 25, showed a complicated three-ribbon structure. To clarify the trigger process of the flare and to evaluate the applicabi…

How pristine is the interior of the comet 67P/Churyumov-Gerasimenko?

Longobardo, Andrea; Palomba, Ernesto; Zinzi, Angelo +14 more

Comets are usually considered to be the most primitive bodies in the Solar System. The level of truth of this paradigm, however, is a matter of debate, especially if by primitive we mean that they represent a sample of intact, unprocessed material. We now have the possibility of analysing the comet 67P/Churyumov-Gerasimenko with an unprecedented l…

Upper Neutral Atmosphere and Ionosphere

Bougher, Stephen W.; Brain, David A.; Fox, Jane L. +3 more

ALMA observations of 4U 1728-34 and 4U 1820-30: first detection of neutron star X-ray binaries at 300 GHz

Díaz Trigo, M.; Rahoui, F.; Russell, D. M. +3 more

We report on the first observations of neutron star low-mass X-ray binaries with the Atacama Large Millimeter/submillimeter Array (ALMA) at 300 GHz. Quasi-simultaneous observations of 4U 1728-34 and 4U 1820-30 were performed at radio (ATCA), infrared (VLT) and X-ray (Swift) frequencies, spanning more than eight decades in frequency coverage. Both …

Evidence for distributed gas sources of hydrogen halides in the coma of comet 67P/Churyumov-Gerasimenko

Neefs, Eddy; Mall, Urs; De Keyser, Johan +24 more

Rosetta has detected the presence of the hydrogen halides HF, HCl, and HBr in the coma of comet 67P/Churyumov-Gerasimenko. These species are known to freeze out on icy grains in molecular clouds. Analysis of the abundances of HF and HCl as a function of cometocentric distance suggests that these hydrogen halides are released both from the nucleus …

CLUMP-3D: three-dimensional lensing and multi-probe analysis of MACS J1206.2-0847, a remarkably regular cluster

Zitrin, Adi; Umetsu, Keiichi; Meneghetti, Massimo +5 more

Multi-wavelength techniques can probe the distribution and the physical properties of baryons and dark matter in galaxy clusters from the inner regions out to the peripheries. We present a full three-dimensional analysis combining strong and weak lensing, X-ray surface brightness and temperature, and the Sunyaev-Zel'dovich effect. The method is ap…

Atmospheric tides in Earth-like planets

Mathis, S.; Laskar, J.; Auclair-Desrotour, P.

Context. Atmospheric tides can strongly affect the rotational dynamics of planets. In the family of Earth-like planets, which includes Venus, this physical mechanism coupled with solid tides makes the angular velocity evolve over long timescales and determines the equilibrium configurations of their spin.
Aims: Unlike the solid core, the atmo…