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Where are all of the nebulae ionized by supersoft X-ray sources?
Gilfanov, M.; Woods, T. E.
Accreting, steadily nuclear-burning white dwarfs are associated with so-called close-binary supersoft X-ray sources (SSSs), observed to have temperatures of a few × 105 K and luminosities on the order of 1038 erg s-1. These and other types of SSSs are expected to be capable of ionizing their surrounding circumstell…
Turbulence-generated Proton-scale Structures in the Terrestrial Magnetosheath
Echim, Marius M.; Consolini, Giuseppe; Vörös, Zoltán +2 more
Recent results of numerical magnetohydrodynamic simulations suggest that in collisionless space plasmas, turbulence can spontaneously generate thin current sheets. These coherent structures can partially explain the intermittency and the non-homogenous distribution of localized plasma heating in turbulence. In this Letter, Cluster multi-point obse…
Globular Clusters, Ultracompact Dwarfs, and Dwarf Galaxies in Abell 2744 at a Redshift of 0.308
Lee, Myung Gyoon; Jang, In Sung
We report a photometric study of globular clusters (GCs), ultracompact dwarfs (UCDs), and dwarf galaxies in the giant merging galaxy cluster Abell 2744 at z = 0.308. Color-magnitude diagrams of the point sources derived from deep F814W (rest frame r‧) and F105W (rest frame I) images of Abell 2744 in the Hubble Space Telescope Frontier Field show a…
Insights into the location and dynamics of the coolest X-ray emitting gas in clusters of galaxies
Zhang, Y. -Y.; Finoguenov, A.; de Plaa, J. +10 more
We extend our previous study of the cool gas responsible for the emission of O VII X-ray lines in the cores of clusters and groups of galaxies. This is the coolest X-ray emitting phase and connects the 10 000 K H α emitting gas to the million degree phase, providing a useful tool to understand cooling in these objects. We study the location of the…
Dynamics of planetary ions in the induced magnetospheres of Venus and Mars
Luhmann, J. G.; Brain, D. A.; Jarvinen, R.
We compare dynamics of planetary ions in the induced magnetospheres of Venus and Mars in a global hybrid simulation to study factors controlling the ion escape at unmagnetized planets. In the simulation we find that the finite Larmor radius (FLR) effects of escaping heavy ions are stronger at Mars than Venus under nominal solar wind conditions. Bu…
Peering Through the Dust: NuSTAR Observations of Two FIRST-2MASS Red Quasars
Brandt, W. N.; Koss, Michael; Yaqoob, Tahir +17 more
Some reddened quasars appear to be transitional objects in the paradigm of merger-induced black hole growth/galaxy evolution, where a heavily obscured nucleus starts to be unveiled by powerful quasar winds evacuating the surrounding cocoon of dust and gas. Hard X-ray observations are able to peer through this gas and dust, revealing the properties…
The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars
Buson, S.; Gehrels, N.; Dauser, T. +32 more
Context. Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics.
Aims: We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multiepoch, quasi-simultaneous broadband spectra. For many of these sources these ar…
The ATCA REXCESS Diffuse Emission Survey (ARDES) - I. Detection of a giant radio halo and a likely radio relic
Pratt, G. W.; Johnston-Hollitt, M.; Shakouri, S.
We present the results of the radio halo survey of 16 REXCESS southern clusters up to a redshift of 0.2 with the Australia Telescope Compact Array (ATCA) at 1.4 and 2.1 GHz. This cluster sample called the ATCA REXCESS Diffuse Emission Survey (ARDES) includes clusters in a wide range of X-ray luminosities and is morphologically unbiased. We find tw…
The X-Ray Luminosity Function of Low-mass X-Ray Binaries in Early-type Galaxies, Their Metal-rich, and Metal-poor Globular Clusters
Zepf, Stephen E.; Peacock, Mark B.
We present the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the globular clusters (GCs) and fields of seven early-type galaxies. These galaxies are selected to have both deep Chandra observations, which allow their LMXB populations to be observed to X-ray luminosities of 1037-1038 erg s-1, …
Brown dwarf disks with Herschel: Linking far-infrared and (sub)-mm fluxes
Greaves, Jane; Testi, Leonardo; Jayawardhana, Ray +4 more
Brown dwarf disks are excellent laboratories to test our understanding of disk physics in an extreme parameter regime. In this paper we investigate a sample of 29 well-characterized brown dwarfs and very low-mass stars, for which Herschel far-infrared fluxes and (sub)-mm fluxes are available. We measured new Herschel/PACS fluxes for 11 objects and…