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Synchrotron Intensity Gradients as Tracers of Interstellar Magnetic Fields
Lee, Hyeseung; Yuen, Ka Ho; Cho, J. +1 more
On the basis of the modern understanding of MHD turbulence, we propose a new way of using synchrotron radiation: using synchrotron intensity gradients (SIGs) for tracing astrophysical magnetic fields. We successfully test the new technique using synthetic data obtained with 3D MHD simulations and provide the demonstration of the practical utility …
Near-Earth Magnetic Field Effects of Large-Scale Magnetospheric Currents
Le, Guan; Lühr, Hermann; Xiong, Chao +1 more
Magnetospheric currents play an important role in the electrodynamics of near-Earth space. This has been the topic of many space science studies. Here we focus on the magnetic fields they cause close to Earth. Their contribution to the geomagnetic field is the second largest after the core field. Significant progress in interpreting the magnetic f…
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores
Infante, L.; Zheng, W.; Molino, A. +41 more
We present accurate photometric redshifts for galaxies observed by the Cluster Lensing And Supernova survey with Hubble (CLASH). CLASH observed 25 massive galaxy cluster cores with the Hubble Space Telescope in 16 filters spanning 0.2-1.7 µm. Photometry in such crowded fields is challenging. Compared to our previously released catalogues, we…
Critical Height of the Torus Instability in Two-ribbon Solar Flares
Wang, Yuming; Liu, Rui; Liu, Jiajia +5 more
We studied the background field for 60 two-ribbon flares of M-and-above classes during 2011-2015. These flares are categorized into two groups, I.e., eruptive and confined flares, based on whether a flare is associated with a coronal mass ejection or not. The background field of source active regions is approximated by a potential field extrapolat…
A Chemical Composition Survey of the Iron-complex Globular Cluster NGC 6273 (M19)
Clarkson, William I.; Caldwell, Nelson; Rich, R. Michael +5 more
Recent observations have shown that a growing number of the most massive Galactic globular clusters contain multiple populations of stars with different [Fe/H] and neutron-capture element abundances. NGC 6273 has only recently been recognized as a member of this “iron-complex” cluster class, and we provide here a chemical and kinematic analysis of…
Physical Properties of Sub-galactic Clumps at 0.5 ≤ Z ≤ 1.5 in the UVUDF
Grogin, Norman A.; Koekemoer, Anton M.; Ravindranath, Swara +8 more
We present an investigation of clumpy galaxies in the Hubble Ultra Deep Field at 0.5≤slant z≤slant 1.5 in the rest-frame far-ultraviolet (FUV) using Hubble Space Telescope Wide Field Camera 3 broadband imaging in F225W, F275W, and F336W. An analysis of 1404 galaxies yields 209 galaxies that host 403 kpc scale clumps. These host galaxies appear to …
The Tarantula Massive Binary Monitoring. II. First SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145
Ulaczyk, K.; Sander, A.; Crowther, P. A. +19 more
We present the first SB2 orbital solution and disentanglement of the massive Wolf-Rayet binary R145 (P = 159 d) located in the Large Magellanic Cloud. The primary was claimed to have a stellar mass greater than 300 M⊙, making it a candidate for being the most massive star known to date. While the primary is a known late-type, H-rich Wol…
Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA
Adam, R.; Benoît, A.; Catalano, A. +45 more
The characterization of dust properties in the interstellar medium is key for understanding the physics and chemistry of star formation. Mass estimates are crucial to determine gravitational collapse conditions for the birth of new stellar objects in molecular clouds. However, most of these estimates rely on dust models that need further observati…
Giant ripples on comet 67P/Churyumov-Gerasimenko sculpted by sunset thermal wind
Jia, Pan; Andreotti, Bruno; Claudin, Philippe
Explaining the unexpected presence of dune-like patterns at the surface of the comet 67P/Churyumov-Gerasimenko requires conceptual and quantitative advances in the understanding of surface and outgassing processes. We show here that vapor flow emitted by the comet around its perihelion spreads laterally in a surface layer, due to the strong pressu…
The JCMT Plane Survey: first complete data release - emission maps and compact source catalogue
Martin, P. G.; White, G. J.; Moore, T. J. T. +42 more
We present the first data release of the James Clerk Maxwell Telescope Plane Survey (JPS), the JPS Public Release 1. JPS is an 850-µm continuum survey of six fields in the northern inner Galactic plane in a longitude range of ℓ = 7°-63°, made with the Submillimetre Common-User Bolometer Array 2. This first data release consists of emission m…