Search Publications
Compact planetary nebulae in the Galactic disk: Analysis of the central stars
Villaver, Eva; Shaw, Richard A.; Stanghellini, Letizia +1 more
Context. We have obtained multi-wavelength observations of compact Galactic planetary nebulae (PNe) to probe post-asymptotic giant branch (AGB) evolution from the onset of nebular ejection. Here we analyze new observations from HST to derive the masses and evolutionary status of their central stars (CSs).
Aims: Our objective here is to derive…
Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS
Eastwood, J. P.; Fujimoto, M.; Phan, T. D. +4 more
This paper describes the efforts of our Inter-Disciplinary Scientist (IDS) team to (a) establish the large-scale context for reconnection diffusion region encounters by MMS at the magnetopause and in the magnetotail, including the distinction between X-line and O-line encounters, that would help the identification of diffusion regions in spacecraf…
No statistical evidence of lightning in Venus night-side atmosphere from VIRTIS-Venus Express Visible observations
Piccioni, G.; Grassi, D.; García Muñoz, A. +2 more
In this study we describe a dedicated analysis of luminous transient events on Venus night side atmosphere with the visible channel of the VIRTIS instrument (280-1100 nm), this being the most comprehensive search of lightning conducted so far with Venus Express data. Our search results in thousands of signal detections, but unfortunately they can …
The dust properties and physical conditions of the interstellar medium in the LMC massive star-forming complex N11
Lebouteiller, V.; Madden, S. C.; Galliano, F. +19 more
We combine Spitzer and Herschel data of the star-forming region N11 in the Large Magellanic Cloud (LMC) to produce detailed maps of the dust properties in the complex and study their variations with the interstellar-medium conditions. We also compare Atacama Pathfinder EXperiment/Large APEX Bolometer Camera (APEX/LABOCA) 870 µm observations …
Relaxation Processes within Flux Ropes in Solar Wind
Perri, S.; Bruno, R.; Carbone, V. +3 more
Flux ropes are localized structures in space plasma whose tube-like organized magnetic configuration can be well approximated by a force-free field model. Both numerical simulations and simple models suggest that the ideal magnetohydrodynamics (MHD) can relax toward a minimum energy state, where magnetic helicity is conserved, characterized by for…
Detection of a Dearth of Stars with Zero Angular Momentum in the Solar Neighborhood
Bovy, Jo; Hunt, Jason A. S.; Carlberg, Raymond G.
We report on the detection in the combined Gaia-DR1/RAVE data of a lack of disk stars in the solar neighborhood with velocities close to zero angular momentum. We propose that this may be caused by the scattering of stars with very low angular momentum onto chaotic, halo-type orbits when they pass through the Galactic nucleus. We model the effect …
Forbush Decrease Prediction Based on Remote Solar Observations
Vršnak, B.; Dumbović, M.; Čalogović, J.
We employ remote observations of coronal mass ejections (CMEs) and the associated solar flares to forecast the CME-related Forbush decreases, i.e. short-term depressions in the galactic cosmic-ray flux. The relation between the Forbush effect at Earth and remote observations of CMEs and associated solar flares is studied via a statistical analysis…
The Herschel Virgo Cluster Survey. XIX. Physical properties of low luminosity FIR sources at z < 0.5
Bizzocchi, Luca; De Looze, Ilse; Baes, Maarten +12 more
Context. The star formation rate is a crucial parameter for the investigation galaxy evolution. At low redshift the cosmic star formation rate density declines smoothly, and massive active galaxies become passive, reducing their star formation activity. This implies that the bulk of the star formation rate density at low redshift is mainly driven …
High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306
D'Ammando, F.; Orienti, M.
We investigate the γ-ray and X-ray properties of the flat spectrum radio quasar PKS 2149-306 at redshift z = 2.345. A strong γ-ray flare from this source was detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope satellite in 2013 January, reaching on January 20 a daily peak flux of (301 ± 36) × 10-8 ph cm
A newly discovered radio halo in merging cluster MACS J2243.3-0935
Han, J. L.; Wen, Z. L.; Oozeer, N. +2 more
We report the discovery of a radio halo in the massive merging cluster MACSJ2243.3-0935, as well as a new radio relic candidate, using the Giant Meterwave Radio Telescope and the Karoo Array Telescope-7 telescope. The radio halo is coincident with the cluster X-ray emission and has a largest linear scale of approximately 0.9 Mpc. We measure a flux…