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Planetary Radio Interferometry and Doppler Experiment (PRIDE) technique: A test case of the Mars Express Phobos fly-by
Lindqvist, M.; Molera Calvés, G.; Gurvits, L. I. +33 more
Context. The closest ever fly-by of the Martian moon Phobos, performed by the European Space Agency's Mars Express spacecraft, gives a unique opportunity to sharpen and test the Planetary Radio Interferometry and Doppler Experiments (PRIDE) technique in the interest of studying planet-satellite systems.
Aims: The aim of this work is to demons…
Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31
Gilbert, Karoline M.; van der Marel, Roeland P.; Sohn, Sangmo Tony +6 more
We present the line-of-sight (LOS) velocities for 13 distant main sequence Milky Way halo stars with published proper motions (PMs). The PMs were measured using long baseline (5-7 years) multi-epoch Hubble Space Telescope/Advanced Camera for Surveys photometry, and the LOS velocities were extracted from deep (5-6 hr integrations) Keck II/DEIMOS sp…
Weak lensing study of 16 DAFT/FADA clusters: Substructures and filaments
Clowe, Douglas; Sarron, Florian; Márquez, Isabel +7 more
While our current cosmological model places galaxy clusters at the nodes of a filament network (the cosmic web), we still struggle to detect these filaments at high redshifts. We perform a weak lensing study for a sample of 16 massive, medium-high redshift (0.4 <z< 0.9) galaxy clusters from the DAFT/FADA survey, which are imaged in at least …
Constraining spatial variations of the fine structure constant using clusters of galaxies and Planck data
Martins, C. J. A. P.; Kocevski, D.; Ebeling, H. +1 more
We propose an improved methodology to constrain spatial variations of the fine structure constant using clusters of galaxies. We use the Planck 2013 data to measure the thermal Sunyaev-Zeldovich effect at the location of 618 x-ray selected clusters. We then use a Monte Carlo Markov Chain algorithm to obtain the temperature of the cosmic microwave …
NLTE carbon abundance determination in selected A- and B-type stars and the interpretation of C I emission lines
Mashonkina, L. I.; Alexeeva, S. A.; Ryabchikova, T. A.
We constructed a comprehensive model atom for C I-C II using the most up-to-date atomic data available and evaluated the non-local thermodynamic equilibrium (NLTE) line formation for C I and C II in classical 1D models representing the atmospheres of A- and late B-type stars. Our NLTE calculations predict the emission that appears at effective tem…
X-Ray Observations of Bow Shocks around Runaway O Stars. The Case of ζ Oph and BD+43°3654
Pohl, M.; Guerrero, M. A.; Toalá, J. A. +3 more
Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations toward the runaway stars ζ Oph by Chandra and Suzaku and of BD+43°3654 by XMM-Newton to search for the presence of non-thermal X-ray emission. We found no evidence of non-thermal emission spatially coincident w…
Slipping Magnetic Reconnection of Flux-rope Structures as a Precursor to an Eruptive X-class Solar Flare
Hou, Yijun; Li, Ting; Zhang, Jun +1 more
We present the quasi-periodic slipping motion of flux-rope structures prior to the onset of an eruptive X-class flare on 2015 March 11, obtained by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory. The slipping motion occurred at the north part of the flux rope and seemed to successively peel off the flux rope. The spee…
Atomic-to-molecular gas phase transition triggered by the radio jet in Centaurus A
Combes, F.; Salomé, P.; Salomé, Q. +1 more
NGC 5128 (Centaurus A) is one of the best example to study AGN-feedback in the local Universe. At 13.5 kpc from the galaxy, optical filaments with recent star formation are lying along the radio-jet direction. We used the Atacama Pathfinder EXperiment (APEX) to map the CO(2-1) emission all along the filaments structure. Molecular gas mass of (8.2 …
Continued decay in the cyclotron line energy in Hercules X-1
Harrison, F. A.; Klochkov, D.; Wilms, J. +2 more
The centroid energy Ecyc of the cyclotron line in the spectrum of the binary X-ray pulsar
Characterizing the Youngest Herschel-detected Protostars. II. Molecular Outflows from the Millimeter and the Far-infrared
Manoj, P.; Wyrowski, Friedrich; Fischer, William J. +7 more
We present Combined Array for Research in Millimeter-wave Astronomy (CARMA) CO (J=1\to 0) observations and Herschel PACS spectroscopy, characterizing the outflow properties toward extremely young and deeply embedded protostars in the Orion molecular clouds. The sample comprises a subset of the Orion protostars known as the PACS Bright Red Sources …