Search Publications
Dayside temperatures in the Venus upper atmosphere from Venus Express/VIRTIS nadir measurements at 4.3 µm
López-Valverde, M. A.; Gilli, G.; Peralta, J. +1 more
In this work, we analysed nadir observations of atmospheric infrared emissions carried out by VIRTIS, a high-resolution spectrometer on board the European spacecraft Venus Express. We focused on the ro-vibrational band of CO2 at 4.3 µm on the dayside, whose fluorescence originates in the Venus upper mesosphere and above. This is t…
Near-infrared photometry of WISE J085510.74-071442.5
Minniti, D.; Bayo, A.; Béjar, V. J. S. +7 more
Aims: We aim at obtaining near-infrared photometry and deriving the mass, age, temperature, and surface gravity of WISE J085510.74-071442.5 (J0855-0714), which is the coolest object beyond the solar system currently known.
Methods: We used publicly available data from the archives of the Hubble Space Telescope (HST) and the Very Large Te…
Multiwavelength study of the fast rotating supergiant high-mass X-ray binary IGR J16465-4507
Goldoni, P.; Chaty, S.; Simón-Díaz, S. +6 more
Context. Since its launch, the X-ray and γ-ray observatory INTEGRAL satellite has revealed a new class of high-mass X-ray binaries (HMXB) displaying fast flares and hosting supergiant companion stars. Optical and infrared (OIR) observations in a multi-wavelength context are essential to understand the nature and evolution of these newly discovered…
Joint signal extraction from galaxy clusters in X-ray and SZ surveys: A matched-filter approach
Arnaud, M.; Pratt, G. W.; Melin, J. -B. +1 more
The hot ionized gas of the intra-cluster medium emits thermal radiation in the X-ray band and also distorts the cosmic microwave radiation through the Sunyaev-Zel'dovich (SZ) effect. Combining these two complementary sources of information through innovative techniques can therefore potentially improve the cluster detection rate when compared to u…
Dependence of the broad Fe Kα line on the physical parameters of AGN
Lu, Youjun; Liu, Zhu; Yuan, Weimin +3 more
In this paper, the dependence of the broad Fe Kα line on the physical parameters of AGN, such as the black hole mass MBH, accretion rate (equivalently represented by Eddington ratio λEdd) and optical classification is investigated by applying the X-ray spectra stacking method to a large sample of AGN which have well measured …
Astronomical surveys and big data
Mickaelian, Areg M.
Recent all-sky and large-area astronomical surveys and their catalogued data over the whole range of electromagnetic spectrum, from γ -rays to radio waves, are reviewed, including such as Fermi-GLAST and INTEGRAL in γ -ray, ROSAT, XMM and Chandra in X-ray, GALEX in UV, SDSS and several POSS I and POSS II-based catalogues (APM, MAPS, USNO, GSC) in …
Inferring the Galactic Potential with GAIA and Friends: Synergies with Other Surveys
Sanderson, Robyn E.
In the coming decade, the Gaia satellite will precisely measure the positions and velocities of millions of stars in the Galactic halo, including stars in many tidal streams. These streams, the products of hierarchical accretion of satellite galaxies by the Milky Way (MW), can be used to infer the Galactic gravitational potential thanks to their i…
Tidal bridge and tidal dwarf candidates in the interacting system Arp194
Egorov, Oleg V.; Zasov, Anatoly V.; Saburova, Anna S. +1 more
Arp194 is a system of recently collided galaxies, where the southern galaxy (S) passed through the gaseous disc of the northern galaxy (N) which in turn consists of two close components. This system is of special interest due to the presence of regions of active star formation in the bridge between galaxies, the brightest of which (the region A) h…
Chromospheric evaporation flows and density changes deduced from Hinode/EIS during an M1.6 flare
Temmer, M.; Veronig, A. M.; Gömöry, P. +2 more
Aims: We study the response of the solar atmosphere during a GOES M1.6 flare using spectroscopic and imaging observations. In particular, we examine the evolution of the mass flows and electron density together with the energy input derived from hard X-ray (HXR) in the context of chromospheric evaporation.
Methods: We analyzed high-caden…
Dependence of Occurrence Rates of Solar Flares and Coronal Mass Ejections on the Solar Cycle Phase and the Importance of Large-scale Connectivity
Moon, Y. -J.; Nakariakov, V. M.; Lee, Kangjin
We investigate the dependence of the occurrence rates of major solar flares (M- and X-class) and front-side halo coronal mass ejections (FHCMEs), observed from 1996 to 2013, on the solar cycle (SC) phase for six active McIntosh sunspot group classes: Fkc, Ekc, Dkc, Fki, Eki, and Dki. We classify SC phases as follows: (1) ascending phase of SC 23 (…