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Planck intermediate results. XL. The Sunyaev-Zeldovich signal from the Virgo cluster
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +202 more
The Virgo cluster is the largest Sunyaev-Zeldovich (SZ) source in the sky, both in terms of angular size and total integrated flux. Planck's wide angular scale and frequency coverage, together with its high sensitivity, enable a detailed study of this big object through the SZ effect. Virgo is well resolved by Planck, showing an elongated structur…
Solar wind interaction with comet 67P: Impacts of corotating interaction regions
Glassmeier, K. -H.; Nilsson, H.; Henri, P. +18 more
We present observations from the Rosetta Plasma Consortium of the effects of stormy solar wind on comet 67P/Churyumov-Gerasimenko. Four corotating interaction regions (CIRs), where the first event has possibly merged with a coronal mass ejection, are traced from Earth via Mars (using Mars Express and Mars Atmosphere and Volatile EvolutioN mission)…
Giant scattering cones in obscured quasars
Zakamska, Nadia L.; Wylezalek, Dominika; Obied, Georges +1 more
We analyse Hubble Space Telescope observations of scattering regions in 20 luminous obscured quasars at 0.24 < z < 0.65 (11 new observations and nine archival ones) observed at rest frame ∼3000 Å. We find spectacular 5-10 kpc-scale scattering regions in almost all cases. The median scattering efficiency at this wavelength (the ratio of obser…
Updated measurements of the dark matter halo masses of obscured quasars with improved WISE and Planck data
Hickox, R. C.; DiPompeo, M. A.; Myers, A. D.
Using the most recent releases of WISE and Planck data, we perform updated measurements of the bias and typical dark matter halo mass of infrared (IR)-selected obscured and unobscured quasars, using the angular autocorrelation function and cosmic microwave background lensing cross-correlations. Since our recent work of this kind, the WISE ALLWISE …
Empirical model of the Martian dayside ionosphere: Effects of crustal magnetic fields and solar ionizing flux at higher altitudes
Gurnett, D. A.; Němec, F.; Morgan, D. D. +1 more
We use electron density profiles measured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument on board the Mars Express spacecraft to investigate the effects of possible controlling parameters unconsidered in the empirical model of Němec et al. (2011, hereafter N11). Specifically, we focus on the effects of crustal magneti…
Formation of new stellar populations from gas accreted by massive young star clusters
Faucher-Giguère, Claude-André; Deng, Licai; de Grijs, Richard +4 more
Stars in clusters are thought to form in a single burst from a common progenitor cloud of molecular gas. However, massive, old ‘globular’ clusters—those with ages greater than ten billion years and masses several hundred thousand times that of the Sun—often harbour multiple stellar populations, indicating that more than one star-forming event occu…
Cold ion heating at the dayside magnetopause during magnetic reconnection
Lavraud, B.; André, M.; Vaivads, A. +5 more
Cold ions of ionospheric origin are known to be present in the magnetospheric side of the Earth's magnetopause. They can be very abundant, with densities up to 100 cm-3. These cold ions can mass load the magnetosphere, changing global parameters of magnetic reconnection, like the Alfvén speed or the reconnection rate. In addition they i…
Local SDSS galaxies in the Herschel Stripe 82 survey: a critical assessment of optically derived star formation rates
Lutz, D.; Trump, J. R.; Mendel, J. T. +2 more
We study a set of 3319 galaxies in the redshift interval 0.04 < z < 0.15 with far-infrared (FIR) coverage from the Herschel Stripe 82 survey (HerS), and emission-line measurements, redshifts, stellar masses and star formation rates (SFRs) from the Sloan Digital Sky Survey (SDSS) (DR7) MPA/JHU data base. About 40 per cent of the sample are de…
Soft γ-ray selected radio galaxies: favouring giant size discovery
Venturi, T.; Dallacasa, D.; Ubertini, P. +5 more
Using the recent INTEGRAL/IBIS and Swift/BAT surveys we have extracted a sample of 64 confirmed plus three candidate radio galaxies selected in the soft gamma-ray band. The sample covers all optical classes and is dominated by objects showing a Fanaroff-Riley type II radio morphology; a large fraction (70 per cent) of the sample is made of `radiat…
In situ observations of flux rope at the separatrix region of magnetic reconnection
Vaivads, A.; Retino, A.; Sahraoui, F. +12 more
We present the first in situ observations of a small-scale flux rope locally formed at the separatrix region of magnetic reconnection without large guide field. Bidirectional electron beams (cold and hot beams) and density cavity accompanied by intense wave activity substantiate the crossing of the separatrix region. Density compression and one pa…