Search Publications
Non-parametric deprojection of NIKA SZ observations: Pressure distribution in the Planck-discovered cluster PSZ1 G045.85+57.71
Adam, R.; Arnaud, M.; Benoît, A. +38 more
The determination of the thermodynamic properties of clusters of galaxies at intermediate and high redshift can bring new insights into the formation of large-scale structures. It is essential for a robust calibration of the mass-observable scaling relations and their scatter, which are key ingredients for precise cosmology using cluster statistic…
Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
Sanna, A.; Rea, N.; Ferrigno, C. +6 more
We report on the discovery of coherent pulsations at a period of 2.9 ms from the X-ray transient MAXI J0911-655 in the globular cluster NGC 2808. We observed X-ray pulsations at a frequency of 339.97 Hz in three different observations of the source performed with XMM-Newton and NuSTAR during the source outburst. This newly discovered accreting mil…
Constraining the ΛCDM and Galileon models with recent cosmological data
Möller, A.; Astier, P.; Guy, J. +4 more
Aims: The Galileon theory belongs to the class of modified gravity models that can explain the late-time accelerated expansion of the Universe. In previous works, cosmological constraints on the Galileon model were derived, both in the uncoupled case and with a disformal coupling of the Galileon field to matter. There, we showed that these mo…
Polarimetry at millimeter wavelengths with the NIKA camera: calibration and performance
Adam, R.; Benoît, A.; Catalano, A. +37 more
Magnetic fields, which play a major role in a large number of astrophysical processes can be traced via observations of dust polarization. In particular, Planck low-resolution observations of dust polarization have demonstrated that Galactic filamentary structures, where star formation takes place, are associated to well organized magnetic fields.…
A Suzaku, NuSTAR, and XMM-Newton view on variable absorption and relativistic reflection in NGC 4151
Dauser, T.; Wilms, J.; Kadler, M. +6 more
We disentangle X-ray disk reflection from complex line-of-sight absorption in the nearby Seyfert NGC 4151, using a suite of Suzaku, NuSTAR, and XMM-Newton observations. Extending upon earlier published work, we pursue a physically motivated model using the latest angle-resolved version of the lamp-post geometry reflection model relxillCp_lp togeth…
Photospheric activity of the Sun with VIRGO and GOLF. Comparison with standard activity proxies
García, R. A.; Pallé, P. L.; Bertello, L. +3 more
We study the variability of solar activity using new photospheric proxies originally developed for the analysis of stellar magnetism with the CoRoT and Kepler photometric observations. These proxies were obtained by tracking the temporal modulations in the observations associated with the spots and magnetic features as the Sun rotates. We analyzed…
Gaia Data Release 1. Cross-match with external catalogues. Algorithm and results
Marinoni, S.; Marrese, P. M.; Fabrizio, M. +1 more
Context. Although the Gaia catalogue on its own will be a very powerful tool, it is the combination of this highly accurate archive with other archives that will truly open up amazing possibilities for astronomical research. The advanced interoperation of archives is based on cross-matching, leaving the user with the feeling of working with one si…
ALMA imaging of C2H emission in the disk of NGC 1068
Tacconi, L. J.; Hunt, L. K.; Krips, M. +16 more
Aims: We study the feedback of star formation and nuclear activity on the chemistry of molecular gas in NGC 1068, a nearby (D = 14 Mpc) Seyfert 2 barred galaxy, by analyzing whether the abundances of key molecular species such as ethynyl (C2H), which is a classical tracer of photon dominated regions (PDR), change in the different e…
Restarting activity in the nucleus of PBC J2333.9-2343. An extreme case of jet realignment
Ghisellini, G.; Masetti, N.; Giroletti, M. +8 more
Context. The giant radio galaxy PBC J2333.9-2343 shows different characteristics at different wavebands that are difficult to explain within the actual generic schemes of unification of active galactic nuclei (AGN). It is therefore a good candidate host for different phases of nuclear activity.
Aims: We aim at disentangling the nature of this…
The MUSE Hubble Ultra Deep Field Survey. VII. Fe II* emission in star-forming galaxies
Feltre, Anna; Bacon, Roland; Finley, Hayley +15 more
Non-resonant Fe II* (λ2365, λ2396, λ2612, λ2626) emission can potentially trace galactic winds in emission and provide useful constraints to wind models. From the 3.15' × 3.15' mosaic of the Hubble Ultra Deep Field (UDF) obtained with the VLT/MUSE integral field spectrograph, we identify a statistical sample of 40 Fe II* emitters and 50 Mg II (λλ2…