Search Publications
Laboratory study of methyl isocyanate ices under astrophysical conditions
Cernicharo, J.; Timón, V.; Maté, B. +5 more
Methyl isocyanate has been recently detected in comet 67P/Churyumov-Gerasimenko (67P/CG) and in the interstellar medium. New physicochemical studies on this species are now necessary as tools for subsequent studies in astrophysics. In this work, infrared spectra of solid CH3NCO have been obtained at temperatures of relevance for astrono…
Magnetic field geometry and chemical abundance distribution of the He-strong star CPD -57°3509
Ilyin, I.; Przybilla, N.; Briquet, M. +9 more
The magnetic field of CPD -57°3509 was recently detected in the framework of the BOB (B fields in OB stars) collaboration. We acquired low-resolution spectropolarimetric observations of CPD -57°3509 with the FOcal Reducer low-dispersion Spectrograph 2 and high-resolution UV-Visual Echelle Spectrograph observations randomly distributed over a few m…
Optimizing future experiments of cosmic far-infrared background: a principal component approach
Wu, Hao-Yi; Doré, Olivier
The anisotropies of cosmic far-infrared background (CFIRB) probe the star formation rate (SFR) of dusty star-forming galaxies as a function of dark matter halo mass and redshift. We explore how future CFIRB experiments can optimally improve the SFR constraints beyond the current measurements of Planck. We introduce a model-independent, piecewise p…
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
Maraschi, L.; Covino, S.; Antonelli, L. A. +143 more
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGR…
The SCUBA-2 Ambitious Sky Survey: a catalogue of beam-sized sources in the Galactic longitude range 120°-140°
Chrysostomou, Antonio; Serjeant, Stephen; Evans, A. +13 more
The SCUBA-2 Ambitious Sky Survey (SASSy) is composed of shallow 850-µm imaging using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) on the James Clerk Maxwell Telescope. Here we describe the extraction of a catalogue of beam-sized sources from a roughly 120 deg2 region of the Galactic plane mapped uniformly (to an rms l…
The effect of X-ray dust scattering on a bright burst from the magnetar 1E 1547.0-5408
Pintore, Fabio; Mereghetti, Sandro; Esposito, Paolo +3 more
A bright burst, followed by an X-ray tail lasting ∼10 ks, was detected during an XMM-Newton observation of the magnetar 1E 1547.0-5408 carried out on 2009 February 3. The burst, also observed by Swift/BAT, had a spectrum well fitted by the sum of two blackbodies with temperatures of ∼4 and 10 keV and a fluence in the 0.3-150 keV energy range of ∼1…
Geomorphological and spectrophotometric analysis of Seth's circular niches on comet 67P/Churyumov-Gerasimenko using OSIRIS images
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
We provide a detailed geomorphological and spectrophotometric analysis of the circular niches located on the Seth region of 67P using OSIRIS images. The features can be related to landslide events that occurred on 67P and shaped its surface, as the recent Aswan cliff collapse detected in the same region. We therefore provide an analysis of the are…
On the physical reality of overlooked open clusters
Piatti, Andrés E.
We present UBVRI and CT1T2 photometry for 15 catalogued open clusters of relative high brightness and compact appearance. From these unprecedented photometric data sets, covering wavelengths from the blue up to the near-infrared, we performed a thorough assessment of their reality as stellar aggregates. We statistically assig…
Spatially radiative properties of 3C 58 and G21.5-0.9
Zhang, Li; Lu, Fang-Wu; Gao, Quan-Gui +1 more
Observations of two pulsar wind nebulae (PWNe) 3C 58 and G21.5-0.9 indicate that they have mostly symmetric spherical morphologies, emit photons from radio to γ-rays and have the radial variations of the photon indices in X-ray band. The spatially radiative properties of 3C 58 and G21.5-0.9 are modelled in the frame of a spatially dependent model.…
Precise CCD positions of Himalia using Gaia DR1 in 2015-2016
Wang, N.; Peng, Q. Y.; Peng, H. W.
In order to obtain high-precision CCD positions of Himalia, the sixth Jovian satellite, a total of 598 CCD observations have been obtained during the years 2015-2016. The observations were made by using the 2.4 and 1 m telescopes administered by Yunnan Observatories over 27 nights. Several factors that would influence the positional precision of H…