Search Publications
Missions
Journals
Publication Years
On the Nature of the Small-scale Structure in the Cosmic Microwave Background Observed by PLANCK and WMAP
Verschuur, G. L.; Schmelz, J. T.
Small-scale features observed by Wilkinson Microwave Anisotropy Probe (WMAP) and PLANCK in the frequency range of 22-90 GHz show a nearly flat spectrum, which meets with expectations that they originate in the early universe. However, free-free emission from electrons in small angular scale galactic sources that suffer beam dilution very closely m…
Narrow-line X-Ray-selected Galaxies in the Chandra-COSMOS Field. II. Optically Elusive X-Ray AGNs
Civano, F.; Elvis, M.; Watson, M. G. +1 more
In the Chandra-COSMOS (C-COSMOS) survey, we have looked for X-ray-selected active galactic nuclei (AGNs), which are not detected as such in the optical, the so-called elusive AGNs. A previous study based on XMM-Newton and Sloan Digital Sky Survey observations has found a sample of 31 X-ray AGNs optically misclassified as star-forming (SF) galaxies…
Obliquities of Exoplanet Host Stars from Precise Distances and Stellar Angular Diameters
Quinn, Samuel N.; White, Russel J.
The next generation of exoplanet space photometry missions proposed by both NASA and ESA promise to discover small transiting planets around the nearest and brightest main-sequence stars. The physical and rotational properties of these stars, in conjunction with Gaia-precision distances, can be used to determine the inclination of the stellar rota…
Current sheet flapping in the near-Earth magnetotail: peculiarities of propagation and parallel currents
Nakamura, Rumi; Petrukovich, Anatoly A.; Artemyev, Anton V. +1 more
We consider series of tilted current sheet crossings, corresponding to flapping waves in the near-Earth magnetotail. We analyse Cluster observations from 2005 to 2009, when spacecraft visited the magnetotail neutral plane near X ∈ [ - 17, - 8], Y ∈ [ - 16, - 2] RE (in the GSM system). Large separation of spacecraft allows us …
The new primary X-ray component confirmed in the Seyfert I galaxy IC 4329A
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +2 more
The bright and highly variable Seyfert I active galactic nucleus IC 4329A was observed with Suzaku five times in 2007 August, with intervals of ∼5 days and a net exposure of 24-31 ks each. Another longer observation was carried out in 2012 August with a net exposure of 118 ks. In the six observations, a source was detected in 2-45 keV with an aver…
On the Retrieval of Mesospheric Winds on Mars and Venus from Ground-based Observations at 10 µm
Lopez-Valverde, M. A.; Sornig, M.; Sonnabend, G. +1 more
A detailed analysis is presented of ground-based observations of atmospheric emissions on Mars and Venus under non-local thermodynamic equilibrium (non-LTE) conditions at high spectral resolution. Our first goal is to comprehend the difficulties behind the derivation of wind speeds from ground-based observations. A second goal is to set a framewor…
The X-Ray Zurich Environmental Study (X-ZENS). II. X-Ray Observations of the Diffuse Intragroup Medium in Galaxy Groups
Schawinski, Kevin; Finoguenov, Alexis; Silverman, John D. +4 more
We present the results of a pilot XMM-Newton and Chandra program aimed at studying the diffuse intragroup medium (IGM) of optically selected nearby groups from the Zurich ENvironmental Study (ZENS) catalog. The groups are in a narrow mass range about {10}13 {M}⊙ , a mass scale at which the interplay between the IGM and the gr…
Multilayer modeling of the aureole photometry during the Venus transit: comparison between SDO/HMI and VEx/SOIR data
Vandaele, A. C.; Wilquet, V.; Mahieux, A. +4 more
Context. The mesosphere of Venus is a critical range of altitudes in which complex temperature variability has been extensively studied by the space mission Venus Express (VEx) during its eight-year mission (2006-2014). In particular, the Solar Occultation in the InfraRed (SOIR) instrument probed the morning and evening terminator in the 70-170 km…
Hot Plasma from Solar Active-Region Cores: Constraints from the Hinode X-Ray Telescope
Schmelz, J. T.; Christian, G. M.; Matheny, P. O.
Mechanisms invoked to heat the solar corona to millions of degrees kelvin involve either magnetic waves or magnetic reconnections. Turbulence in the convection zone produces MHD waves, which travel upward and dissipate. Photospheric motions continuously build up magnetic energy, which is released through magnetic reconnection. In this paper, we co…
Rosetta-Philae RF link, challenging communications from a comet
Dudal, Clément; Loisel, Céline
The Rosetta spacecraft reached the vicinity of the comet 67P/Churyumov-Gerasimenko in 2014 and released the lander Philae for an in-situ analysis through 10 scientific instruments. The analysis of the lander RF link telemetry reveals major information on the lander orientation and its near environment during the 50-h mission on the comet. The Phil…