Search Publications
Radar sounder evidence of thick, porous sediments in Meridiani Planum and implications for ice-filled deposits on Mars
Grant, John A.; Plaut, Jeffrey J.; Phillips, Roger J. +5 more
Meridiani Planum is one of the most intensely studied regions on Mars, yet little is known about the physical properties of the deposits below those examined by the Opportunity rover. We report the detection of subsurface echoes within the Meridiani Planum deposits from data obtained by the Mars Advanced Radar for Subsurface and Ionospheric Soundi…
The growth of typical star-forming galaxies and their supermassive black holes across cosmic time since z ∼ 2
Smail, Ian; Sobral, David; Harrison, Chris +5 more
Understanding galaxy formation and evolution requires studying the interplay between the growth of galaxies and the growth of their black holes across cosmic time. Here, we explore a sample of Hα-selected star-forming galaxies from the High Redshift Emission Line Survey and use the wealth of multiwavelength data in the Cosmic Evolution Survey fiel…
Search for very high-energy gamma-ray emission from the microquasar Cygnus X-1 with the MAGIC telescopes
Maraschi, L.; Covino, S.; Antonelli, L. A. +144 more
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole transient. During the latter, Cygnus X-1 shows a one-sided relativistic radio-jet. Recent detection of the system in the high energy (HE; E ≳ 60 MeV) gamma-ray range with Fermi-LAT associates this emission with the outflow. Former MAGIC observations reve…
Thermophysical characteristics of the large main-belt asteroid (349) Dembowska
Ip, Wing-Huen; Yu, Liang Liang; Ji, Jianghui +1 more
(349) Dembowska is a large, bright main-belt asteroid that has a fast rotation and an oblique spin axis. It might have experienced partial melting and differentiation. We constrain Dembowska's thermophysical properties, such as thermal inertia, roughness fraction, geometric albedo and effective diameter within 3σ uncertainty of Γ =20^{+12}_{-7} Jm…
Spatially Resolved Patchy Lyα Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8
Acharyya, Ayan; Rigby, Jane R.; Bian, Fuyan +10 more
We report the detection of extended Lyα emission from the host galaxy of SDSS J2222+2745, a strongly lensed quasar at z = 2.8. Spectroscopic follow-up clearly reveals extended Lyα in emission between two images of the central active galactic nucleus (AGN). We reconstruct the lensed quasar host galaxy in the source plane by applying a strong lens m…
Characterizing the Stellar Population of NGC 1980
Kounkel, Marina; Hartmann, Lee; Calvet, Nuria +1 more
NGC 1980 is a young cluster that is located about 0.°5 south of the Orion Nebula Cluster (ONC). Recent studies by Bouy et al. and Pillitteri et al. have suggested that NGC 1980 contains an older population of stars compared to a much younger ONC, and that it belongs to a foreground population that may be located in front of the Orion A molecular g…
The SOPHIE search for northern extrasolar planets. XII. Three giant planets suitable for astrometric mass determination with Gaia
Bouchy, F.; Deleuil, M.; Moutou, C. +22 more
We present new radial velocity measurements for three low-metallicity solar-like stars observed with the SOPHIE spectrograph and its predecessor ELODIE, both installed at the 193 cm telescope of the Haute-Provence Observatory, allowing the detection and characterization of three new giant extrasolar planets in intermediate periods of 1.7 to 3.7 yr…
A Complete Census of Hα Emitters in NGC 6397
Pallanca, Cristina; Mucciarelli, Alessio; Ferraro, Francesco R. +3 more
We used a data set of archival Hubble Space Telescope images obtained through the F555W, F814W, and F656N filters to perform a complete search for objects showing {{H}}α emission in the globular cluster NGC 6397. As a photometric diagnostic, we used the {(V-{{H}}α )}0 color excess in the {(V-{{H}}α )}0-{(V-I)}0 col…
Near-periodical spin period evolution in the binary system LMC X-4
Tsygankov, S.; Lutovinov, A.; Molkov, S. +2 more
In this paper, we investigated the long-term evolution of the pulse period in the high-mass X-ray binary LMC X-4 by taking advantage of more than 43 yr of measurements in the X-ray domain. Our analysis revealed for the first time that the source is displaying near-periodical variations of its spin period on a time-scale of roughly 6.8 yr, making L…
Minimal Magnetic States of the Sun and the Solar Wind: Implications for the Origin of the Slow Solar Wind
von Steiger, R.; Cliver, E. W.
During the last decade it has been proposed that both the Sun and the solar wind have minimum magnetic states, lowest order levels of magnetism that underlie the 11-yr cycle as well as longer-term variability. Here we review the literature on basal magnetic states at the Sun and in the heliosphere and draw a connection between the two based on the…