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Planck intermediate results. XXVI. Optical identification and redshifts of Planck clusters with the RTT150 telescope
Böhringer, H.; Kneissl, R.; Dahle, H. +197 more
We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with the Russian-Turkish 1.5 m telescope (RTT150), as a part of the optical follow-up programme undertaken by the Planck collaboration. During this time period approximately 20% of all dark and grey clear time available at the telescope was…
The structure of the regolith on 67P/Churyumov-Gerasimenko from ROLIS descent imaging
Bibring, J. -P.; Jaumann, R.; Mottola, S. +15 more
The structure of the upper layer of a comet is a product of its surface activity. The Rosetta Lander Imaging System (ROLIS) on board Philae acquired close-range images of the Agilkia site during its descent onto comet 67P/Churyumov-Gerasimenko. These images reveal a photometrically uniform surface covered by regolith composed of debris and blocks …
A powerful double radio relic system discovered in PSZ1 G108.18-11.53: evidence for a shock with non-uniform Mach number?
van Weeren, R. J.; Bonafede, A.; Brüggen, M. +5 more
Diffuse radio emission in the form of radio haloes and relics has been found in a number of merging galaxy clusters. These structures indicate that shock and turbulence associated with the merger accelerate electrons to relativistic energies. We report the discovery of a radio relic + radio halo system in PSZ1 G108.18-11.53 (z = 0.335). This clust…
Anomalous Relative Ar/Ca Coronal Abundances Observed by the Hinode/EUV Imaging Spectrometer Near Sunspots
Doschek, G. A.; Warren, H. P.; Feldman, U.
In determining the element abundance of argon (a high first ionization potential; FIP element) relative to calcium (a low FIP element) in flares, unexpectedly high intensities of two Ar xiv lines (194.40, 187.96 Å) relative to a Ca xiv line (193.87 Å) intensity were found in small (a few arcseconds) regions near sunspots in flare spectra recorded …
Spectroscopically resolved far-IR observations of the massive star-forming region G5.89-0.39
Menten, K. M.; Levrier, F.; Gerin, M. +9 more
Context. The fine-structure line of atomic oxygen at 63 µm ([OI]63µm) is an important diagnostic tool in different fields of astrophysics: it is for example predicted to be the main coolant in several environments of star-forming regions (SFRs). However, our knowledge of this line relies on observations with low spectral res…
Magnetic Fields of Neutron Stars in X-Ray Binaries
Mereghetti, Sandro; Revnivtsev, Mikhail
A substantial fraction of the known neutron stars resides in X-ray binaries—systems in which one compact object accretes matter from a companion star. Neutron stars in X-ray binaries have magnetic fields among the highest found in the Universe, spanning at least the range from ∼108 to several 1013 G. The magnetospheres around…
Oscillating Light Wall Above a Sunspot Light Bridge
Yang, Shuhong; Zhang, Jun; Xiang, Yongyuan +1 more
With the high tempo-spatial Interface Region Imaging Spectrograph 1330 Å images, we find that many bright structures are rooted in the light bridge of NOAA 12192, forming a light wall. The light wall is brighter than the surrounding areas, and the wall top is much brighter than the wall body. The New Vacuum Solar Telescope Hα and the Solar Dynamic…
Empirical model of lower band chorus wave distribution in the outer radiation belt
Krasnoselskikh, V.; Artemyev, A. V.; Agapitov, O. V. +2 more
Accurate modeling of wave-particle interactions in the radiation belts requires detailed information on wave amplitudes and wave-normal angular distributions over L shells, magnetic latitudes, magnetic local times, and for various geomagnetic activity conditions. In this work, we develop a new and comprehensive parametric model of VLF chorus waves…
New Insights on the Galactic Bulge Initial Mass Function
Salaris, M.; Anderson, J.; Cignoni, M. +15 more
We have derived the Galactic bulge initial mass function (IMF) of the Sagittarius Window Eclipsing Extrasolar Planet Search field in the mass range 0.15 \lt M/{M}⊙ 1.0, using deep photometry collected with the Advanced Camera for Surveys on the Hubble Space Telescope. Observations at several epochs, spread over 9 years, allowed us to s…
Evidence for Thermal X-Ray Line Emission from the Synchrotron-dominated Supernova Remnant RX J1713.7-3946
Acero, Fabio; Katsuda, Satoru; Petre, Robert +14 more
We report the first detection of thermal X-ray line emission from the supernova remnant (SNR) RX J1713.7-3946, the prototype of the small class of synchrotron-dominated SNRs. A softness-ratio map generated using XMM-Newton data shows that faint interior regions are softer than bright shell regions. Using Suzaku and deep XMM-Newton observations, we…