Search Publications
First multi-wavelength campaign on the gamma-ray-loud active galaxy IC 310
Maraschi, L.; Covino, S.; Antonelli, L. A. +161 more
Context. The extragalactic very-high-energy gamma-ray sky is rich in blazars. These are jetted active galactic nuclei that are viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are so far known to emit above 100 GeV. Multi-wavelength studies of such objects up to the highest energies provide new insig…
SPRINTS: A Framework for Solar-Driven Event Forecasting and Research
Falconer, D. A.; Engell, A. J.; Schuh, M. +2 more
Capabilities to predict onset and time profiles of solar-driven events, including solar X-ray flares; solar energetic particles (SEP); coronal mass ejections; and high-speed streams, are critical in mitigating their potential impacts. We introduce the Space Radiation Intelligence System (SPRINTS). This NASA-invested technology integrates preerupti…
Black hole spin of Cygnus X-1 determined from the softest state ever observed
Done, Chris; Fukazawa, Yasushi; Takahashi, Hiromitsu +3 more
We show the softest ever spectrum from Cyg X-1, detected in 2013 with Suzaku. This has the weakest high-energy Compton tail ever seen from this object, so should give the cleanest view of the underlying disk spectrum, and hence the best determination of black hole spin from disk continuum fitting. Using the standard model of a disk with simple non…
Probing the Cold Dust Emission in the AB Aur Disk: A Dust Trap in a Decaying Vortex?
Cernicharo, José; Fuente, Asunción; Baruteau, Clément +6 more
One serious challenge for planet formation is the rapid inward drift of pebble-sized dust particles in protoplanetary disks. Dust trapping at local maxima in the disk gas pressure has received much theoretical attention but still lacks observational support. The cold dust emission in the AB Aur disk forms an asymmetric ring at a radius of about 12…
Structure formation in a colliding flow: The Herschel view of the Draco nebula
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +9 more
Context. The Draco nebula is a high Galactic latitude interstellar cloud observed at velocities corresponding to the intermediate velocity cloud regime. This nebula shows unusually strong CO emission and remarkably high-contrast small-scale structures for such a diffuse high Galactic latitude cloud. The 21 cm emission of the Draco nebula reveals t…
Discovery of a glitch in the accretion-powered pulsar SXP 1062
Serim, M. M.; Şahiner, Ş.; ćerri-Serim, D. +2 more
We present timing analysis of the accretion-powered pulsar SXP 1062, based on the observations of Swift, XMM-Newton and Chandra satellites covering a time span of about 2 yr. We obtain a phase coherent timing solution that shows that SXP 1062 has been steadily spinning down with a rate -4.29(7) × 10-14 Hz s-1 leading to a sur…
Long-term survival of surface water ice on comet 67P
Jorda, L.; Lamy, P. L.; Lara, L. M. +53 more
Numerous water-ice-rich deposits surviving more than several months on comet 67P/Churyumov-Gerasimenko were observed during the Rosetta mission. We announce the first-time detection of water-ice features surviving up to 2 yr since their first observation via OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) NAC (narrow angle came…
Obscured active galactic nuclei triggered in compact star-forming galaxies
Juneau, Stéphanie; Capak, Peter; McCracken, H. J. +10 more
We present a structural study of 182 obscured active galactic nuclei (AGNs) at z ≤ 1.5, selected in the Cosmic Evolution Survey field from their extreme infrared to X-ray luminosity ratio and their negligible emission at optical wavelengths. We fit optical to far-infrared spectral energy distributions and analyse deep Hubble Space Telescope imagin…
Enhancement of oxygen in the magnetic island associated with dipolarization fronts
Cao, J. B.; Fu, H. S.; Liu, W. L. +2 more
A significant enhancement of O+ is observed by Cluster inside an earthward propagating magnetic island behind a dipolarization front (DF). Such enhancement, from 0.005 to 0.03 cm-3, makes the O+ flux inside the magnetic island 20 times larger than that outside the magnetic island. In the meantime, the H+…
The Dynamics of Very High Alfvén Mach Number Shocks in Space Plasmas
Burgess, David; Sulaiman, Ali H.; Sundberg, Torbjörn +2 more
Astrophysical shocks, such as planetary bow shocks or supernova remnant shocks, are often in the high or very-high Mach number regime, and the structure of such shocks is crucial for understanding particle acceleration and plasma heating, as well inherently interesting. Recent magnetic field observations at Saturn’s bow shock, for Alfvén Mach numb…