Search Publications
Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS
Tiengo, Andrea; Haberl, Frank; Belfiore, Andrea +9 more
We performed a search for eclipsing and dipping sources in the archive of the EXTraS project—a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A system…
Long-term optical and X-ray variability of the Be/X-ray binary H 1145-619: Discovery of an ongoing retrograde density wave
Mas-Hesse, J. M.; Coe, M. J.; Reig, P. +7 more
Context. Multiwavelength monitoring of Be/X-ray binaries is crucial to understand the mechanisms producing their outbursts. H 1145-619 is one of these systems, which has recently displayed X-ray activity.
Aims: We investigate the correlation between the optical emission and X-ray activity to predict the occurrence of new X-ray outbursts from …
The Evolution of Juventae Chasma, Valles Marineris, Mars: Progressive Collapse and Sedimentation
Hauber, E.; Rossi, A. P.; Flahaut, J. +3 more
Juventae Chasma is an isolated chasm located north of the interconnected chasms within Valles Marineris. It contains four separate interior layered deposit (ILD) mounds. We have combined layer measurements, as well as mineralogical data of the mounds with topographic data of the remaining chasm and the surrounding plateau. Our observations indicat…
Interstellar extinction in Orion: variation of the strength of the ultraviolet bump across the complex
Beitia-Antero, Leire; Gómez de Castro, Ana I.
There is growing observational evidence of dust coagulation in the dense filaments within molecular clouds. Infrared observations show that the dust grain size distribution becomes shallower and the relative fraction of small to large dust grains decreases as the local density increases. Ultraviolet (UV) observations show that the strength of the …
Cosmology with XMM galaxy clusters: the X-CLASS/GROND catalogue and photometric redshifts
Greiner, J.; Salvato, M.; Nandra, K. +11 more
The XMM Cluster Archive Super Survey (X-CLASS) is a serendipitously detected X-ray-selected sample of 845 galaxy clusters based on 2774 XMM archival observations and covering an approximately 90 deg2 spread across the high-Galactic latitude (|b| > 20°) sky. The primary goal of this survey is to produce a well-selected sample of galax…
Rapid optical variations correlated with X-rays in the 2015 second outburst of V404 Cygni (GS 2023+338)
Nogami, Daisaku; Shidatsu, Megumi; Kato, Taichi +24 more
We present optical multicolour photometry of V404 Cyg during the outburst from 2015 December to 2016 January together with the simultaneous X-ray data. This outburst occurred less than six months after the previous outburst in 2015 June-July. These two outbursts in 2015 were of a slow-rise and rapid-decay type and showed large-amplitude (∼2 mag) a…
The Wolf-Rayet star population in the dwarf galaxy NGC 625
Walsh, J. R.; Monreal-Ibero, A.; Relaño, M. +4 more
Context. Quantifying the number, type, and distribution of Wolf-Rayet (W-R) stars is a key component in the context of galaxy evolution, since they put constraints on the age of the star formation bursts. Nearby galaxies (distances ≲5 Mpc) are particularly relevant in this context since they fill the gap between studies in the Local Group, where i…
AKARI/IRC source catalogues and source counts for the IRAC Dark Field, ELAIS North and the AKARI Deep Field South
Serjeant, S.; Pearson, C.; Matsuhara, H. +4 more
We present the first detailed analysis of three extragalactic fields (IRAC Dark Field, ELAIS-N1, ADF-S) observed by the infrared satellite, AKARI, using an optimized data analysis toolkit specifically for the processing of extragalactic point sources. The InfaRed Camera (IRC) on AKARI complements the Spitzer Space Telescope via its comprehensive c…
On the estimation of the current density in space plasmas: Multi- versus single-point techniques
Sorriso-Valvo, Luca; Perri, Silvia; Malara, Francesco +2 more
Thanks to multi-spacecraft mission, it has recently been possible to directly estimate the current density in space plasmas, by using magnetic field time series from four satellites flying in a quasi perfect tetrahedron configuration. The technique developed, commonly called ;curlometer; permits a good estimation of the current density when the ma…
Testing the Interacting Dark Energy Model with Cosmic Microwave Background Anisotropy and Observational Hubble Data
Yang, Weiqiang; Xu, Lixin; Wu, Yabo +2 more
The coupling between dark energy and dark matter provides a possible approach to mitigate the coincidence problem of the cosmological standard model. In this paper, we assumed the interacting term was related to the Hubble parameter, energy density of dark energy, and equation of state of dark energy. The interaction rate between dark energy and d…