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Dense cores and star formation in the giant molecular cloud Vela C★★★
Hill, T.; Weiss, A.; Csengeri, T. +12 more
Context. The Vela Molecular Ridge is one of the nearest (700 pc) giant molecular cloud (GMC) complexes hosting intermediate-mass (up to early B, late O stars) star formation, and is located in the outer Galaxy, inside the Galactic plane. Vela C is one of the GMCs making up the Vela Molecular Ridge, and exhibits both sub-regions of robust and sub-r…
Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?
Ferguson, Henry C.; Giavalisco, Mauro; Koekemoer, Anton M. +13 more
Hubble Space Telescope observations show that low-mass (M_*=10^9-10^{10} M_{⊙ }) galaxies at high redshift (z = 1.0-2.5) tend to be elongated (prolate) rather than disky (oblate) or spheroidal. This is explained in zoom-in cosmological hydrodynamical simulations by the fact that these galaxies are forming in cosmic web filaments where accretion ha…
The distance, rotation, and physical parameters of ζ Pup
Howarth, Ian D.; van Leeuwen, Floor
We scrutinize the Hipparcos parallax for the bright O supergiant ζ Pup and confirm that the implied distance of 332 ± 11 pc appears to be reliable. We then review the implications for the star's physical parameters and the consequences for the interpretation of Pphot, the 1.78-d photometric period. The inferred mass, radius, and luminos…
The Cassini VIMS archive of Titan: From browse products to global infrared color maps
Le Mouélic, S.; Cornet, T.; Rodriguez, S. +11 more
We have analyzed the complete Visual and Infrared Mapping Spectrometer (VIMS) data archive of Titan. Our objective is to build global surface cartographic products, by combining all the data gathered during the 127 targeted flybys of Titan into synthetic global maps interpolated on a grid at 32 pixels per degree (∼1.4 km/pixel at the equator), in …
Lyman-α emission in the Martian proton aurora: Line profile and role of horizontal induced magnetic field
Ritter, B.; Hubert, B.; Shematovich, V. I. +2 more
Enhancements of the dayside Lyman-α emission by as much as ∼50% have been observed between 120 and 130 km in the lower Martian thermosphere from the Mars Express and MAVEN satellites, usually following solar events such as coronal mass ejections and corotating interaction regions. They have been assumed to be optical signatures of proton aurora re…
Micrometeoroid Events in LISA Pathfinder
Mendes, L.; Madden, S.; Russano, G. +121 more
The zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. We present a new set of data obtained from direct measurements of momentum transfer to a spacecraft from individual particle impacts. This te…
CCD UBV photometric and Gaia astrometric study of eight open clusters—ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21
Paunzen, E.; Güver, T.; Bilir, S. +8 more
In this study, we carried out CCD UBV photometry of eight open clusters, ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1, Stock 21, and determined their reddening, metallicity, distance, age, and mass functions. We used new Gaia Data Release 2 (DR2) astrometric data to separate cluster member stars from the field stars a…
The Fluid-like and Kinetic Behavior of Kinetic Alfvén Turbulence in Space Plasma
Verscharen, Daniel; Wicks, Robert T.; Chen, Christopher H. K. +3 more
Kinetic Alfvén waves (KAWs) are the short-wavelength extension of the magnetohydrodynamics Alfvén-wave branch in the case of highly oblique propagation with respect to the background magnetic field. Observations of space plasma show that small-scale turbulence is mainly KAW-like. We apply two theoretical approaches, a collisional two-fluid theory …
Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951
Docobo, J. A.; Hussein, A. M.; Mardini, M. K. +5 more
The precise determination of the physical and dynamical parameters of the HIP 109951 triple star system (WDS J22161-0705AB) which is formed by the A, Ba, and Bb components are presented. The binary nature of component B was recently confirmed by studying the radial velocities. The analysis of the system follows Al-Wardat's complex method for analy…
Thermal balance and comparison of gas and dust properties of dense clumps in the Hi-GAL survey
Rygl, K. L. J.; Elia, D.; Schisano, E. +7 more
We present a comparative study of physical properties derived from gas and dust emission in a sample of 1068 dense Galactic clumps. The sources are selected from the cross-match of the Herschel Infrared Galactic Plane Survey with 16 catalogues of NH3 line emission in its lowest inversion (1,1) and (2,2) transitions. The sample covers a …