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Magnetic field pile-up and draping at intermediately active comets: results from comet 67P/Churyumov-Gerasimenko at 2.0 AU
Glassmeier, K. -H.; Goetz, C.; Richter, I. +2 more
The interaction between a comet and the impinging solar wind leads to modifications of the magnetic field in the environment of a comet. Among those, one finds magnetic field pile-up and draping, which reveal properties of the interaction and are known from previous cometary spacecraft missions. This work studies the magnetic field configuration a…
The Red Sequence at Birth in the Galaxy Cluster Cl J1449+0856 at z = 2
Finoguenov, A.; Cimatti, A.; Daddi, E. +10 more
We use Hubble Space Telescope/WFC3 imaging to study the red population in the IR-selected, X-ray detected, low-mass cluster Cl J1449+0856 at z = 2, one of the few bona fide established clusters discovered at this redshift, and likely a typical progenitor of an average massive cluster today. This study explores the presence and significance of an e…
Morphologic evidence of subsurface sediment mobilization and mud volcanism in Candor and Coprates Chasmata, Valles Marineris, Mars
Okubo, Chris H.
Populations of distinctive knobs, rings and lobate structures are observed in the Candor and Coprates Chasmata regions of Mars. To interpret the formation mechanisms of these landforms, I investigate their morphologies, facies, superposition and crosscutting relationships using data from the High Resolution Imaging Science Experiment (HiRISE) and …
TeV Gamma-Ray Observations of the Galactic Center Ridge by VERITAS
Pelassa, V.; Archer, A.; Benbow, W. +73 more
The Galactic Center ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component and the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Prev…
Evidence for magnetic field compression in shocks within the jet of V404 Cyg
Covino, S.; Russell, D. M.; Fender, R. P. +3 more
We present optical and near-IR linear polarimetry of V404 Cyg during its 2015 outburst and in quiescence. We obtained time-resolved r'-band polarimetry when the source was in outburst, near-IR polarimetry when the source was near quiescence and multiple waveband optical polarimetry later in quiescence. The optical-to-near-IR linear pola…
Planck Cold Clumps in the λ Orionis Complex. I. Discovery of an Extremely Young Class 0 Protostellar Object and a Proto-brown Dwarf Candidate in the Bright-rimmed Clump PGCC G192.32-11.88
Sanhueza, Patricio; Kwon, Woojin; Lai, Shih-Ping +37 more
We are performing a series of observations with ground-based telescopes toward Planck Galactic cold clumps (PGCCs) in the λ Orionis complex in order to systematically investigate the effects of stellar feedback. In the particular case of PGCC G192.32-11.88, we discovered an extremely young Class 0 protostellar object (G192N) and a proto-brown dwar…
The Grism Lens-Amplified Survey from Space (GLASS). VII. The Diversity of the Distribution of Star Formation in Cluster and Field Galaxies at 0.3 less than or equal to z less than or equal to 0.7
Pentericci, Laura; Schmidt, Kasper B.; Treu, Tommaso +10 more
Exploiting the slitless spectroscopy taken as part of the Grism Lens-Amplified Survey from Space (GLASS), we present an extended analysis of the spatial distribution of star formation in 76 galaxies in 10 clusters at 0.3\lt z\lt 0.7. We use 85 foreground and background galaxies in the same redshift range as a field sample. The samples are well mat…
Photospheric and coronal magnetic fields in six magnetographs. I. Consistent evolution of the bashful ballerina
Mursula, Kalevi; Virtanen, Ilpo
Aims: We study the long-term evolution of photospheric and coronal magnetic fields and the heliospheric current sheet (HCS), especially its north-south asymmetry. Special attention is paid to the reliability of the six data sets used in this study and to the consistency of the results based on these data sets.
Methods: We use synoptic ma…
Revealing the broad iron Kα line in Cygnus X-1 through simultaneous XMM-Newton, RXTE, and INTEGRAL observations
Grinberg, Victoria; Pottschmidt, Katja; Staubert, Rüdiger +15 more
We report on the analysis of the broad Fe Kα line feature of Cyg X-1 in the spectra of four simultaneous hard intermediate state observations made with the X-ray Multiple Mirror mission (XMM-Newton), the Rossi X-ray Timing Explorer (RXTE), and the International Gamma-Ray Astrophysics Laboratory (INTEGRAL). The high quality of the XMM-Newton data t…
A Microfilament-eruption Mechanism for Solar Spicules
Moore, Ronald L.; Sterling, Alphonse C.
Recent investigations indicate that solar coronal jets result from eruptions of small-scale chromospheric filaments, called minifilaments; that is, the jets are produced by scaled-down versions of typical-sized filament eruptions. We consider whether solar spicules might in turn be scaled-down versions of coronal jets, being driven by eruptions of…