Search Publications
New Candidate Planetary Nebulae in Galactic Globular Clusters from the VVV Survey
Minniti, Dante; Dias, Bruno; Gómez, Matías +2 more
Only four globular cluster planetary nebulae (GCPN) are known so far in the Milky Way. About 50 new globular clusters have been recently discovered toward the Galactic bulge. We present a search for planetary nebulae within 3‧ of the new globular clusters, revealing the identification of new candidate GCPN. These possible associations are PN SB 2 …
Detection of spike-like structures near the front of type-II bursts
Hillaris, A.; Preka-Papadema, P.; Moussas, X. +6 more
Aims: We examine high time resolution dynamic spectra for fine structures in type II solar radio bursts
Methods: We used data obtained with the acousto-optic spectrograph receiver of the Artemis-JLS (ARTEMIS-IV) solar radio spectrograph in the 450-270 MHz range at 10 ms cadence and identified more than 600 short, narrowband features. The…
Detecting the orbital motion of nearby supermassive black hole binaries with Gaia
Loeb, Abraham; D'Orazio, Daniel J.
We show that a 10-yr Gaia mission could astrometrically detect the orbital motion of ∼1 subparsec separation supermassive black hole binary in the heart of nearby, bright active galactic nuclei (AGN). Candidate AGN lie out to a redshift of z =0.02 and in the V-band magnitude range 10 ≲mV≲13 . The distribution of detectable binary masses…
2003-2018 Monitoring of the Crab Nebula Polarization in Hard X-Rays with INTEGRAL SPI
Jourdain, E.; Roques, J. -P.
We analyzed 16 yr of observations dedicated to the Crab (pulsar + nebula) with the SPectrometer on International Gamma-Ray Astrophysics Laboratory instrument to investigate its polarization properties. We find that the source presents a substantially polarized emission (PF = 24%) in the hard X-ray domain, with the electric vector aligned with the …
Radical-assisted polymerization in interstellar ice analogues: formyl radical and polyoxymethylene
Duvernay, F.; Danger, G.; Chiavassa, T. +5 more
We present new laboratory experiments on the low-temperature formation of complex organic molecules (COMs) such as polyoxymethylene (POM), glycolaldehyde, ethylene glycol, and possibly glyceraldehyde and glycerol through radical-induced reactivity from vacuum ultraviolet (VUV) photolysis of formaldehyde in Ar and Xe matrices. The radical reactivit…
Active Region Modulation of Coronal Hole Solar Wind
Wicks, Robert T.; Long, David M.; Harra, Louise K. +4 more
Active regions (ARs) are a candidate source of the slow solar wind (SW), the origins of which are a topic of ongoing research. We present a case study that examines the processes by which SW is modulated in the presence of an AR in the vicinity of the SW source. We compare properties of SW associated with a coronal hole (CH)-quiet Sun boundary to …
Quantifying the Propagation of Fast Coronal Mass Ejections from the Sun to Interplanetary Space by Combining Remote Sensing and Multi-point In Situ Observations
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
In order to have a comprehensive view of the propagation and evolution of coronal mass ejections (CMEs) from the Sun to deep interplanetary space beyond 1 au, we carry out a kinematic analysis of seven CMEs in solar cycle 23. The events are required to have coordinated coronagraph observations, interplanetary type II radio bursts, and multi-point …
LISA Pathfinder mission extension: A feasibility analysis
Rasotto, Mirco; Renk, Florian; Dei Tos, Diogene A. +1 more
A proposed mission extension for LISA Pathfinder involved redirecting the probe to the Sun-Earth gravitational saddle point. Realistic models for both space and ground segments were used to carry out a number of analyses for trajectory design, orbit determination, and navigation cost. In this work, we present the methods that allow assessing the f…
Interpretation through experimental simulations of phase functions revealed by Rosetta in 67P/Churyumov-Gerasimenko dust coma
Lasue, J.; Fulle, M.; Bertini, I. +3 more
Context. The dust-brightness phase curves that have been measured by the OSIRIS cameras on board the Rosetta spacecraft within the coma of comet 67P/Churyumov-Gerasimenko (67P) present a remarkable flattened u-shape.
Aims: Our goal is to compare these phase curves with those of tentatively analog dust samples to assess the key dust properties…
Precise Mass Determination of SPT-CL J2106-5844, the Most Massive Cluster at z > 1
Huang, Xiaosheng; Rubin, David; Perlmutter, Saul +5 more
We present a detailed high-resolution weak-lensing study of SPT-CL J2106-5844 at z = 1.132, claimed to be the most massive system discovered at z > 1 in the South Pole Telescope Sunyaev-Zel’dovich survey. Based on the deep imaging data from the Advanced Camera for Surveys and Wide Field Camera 3 on board the Hubble Space Telescope, we find that…