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Brightest X-Ray Clusters of Galaxies in the CFHTLS Wide Fields: Catalog and Optical Mass Estimator
Finoguenov, A.; Tanaka, M.; Egami, E. +13 more
The Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) presents a unique data set for weak-lensing studies, having high-quality imaging and deep multiband photometry. We have initiated an XMM-CFHTLS project to provide X-ray observations of the brightest X-ray-selected clusters within the wide CFHTLS area. Performance of these observations and t…
The Slim-disk State of the Ultraluminous X-Ray Source in M83
Soria, Roberto; Blair, William P.; Kuntz, K. D. +3 more
The transient ULX in M83 that went into outburst in, or shortly before, 2010 is still active. Our new XMM-Newton spectra show that it has a curved spectrum typical of the upper end of the high/soft state or slim-disk state. It appears to be spanning the gap between Galactic stellar-mass black holes (BHs) and the ultraluminous state, at X-ray lumin…
Triangulation of the Interstellar Magnetic Field
McComas, D. J.; Schwadron, N. A.; Richardson, J. D. +2 more
Determining the direction of the local interstellar magnetic field (LISMF) is important for understanding the heliosphere’s global structure, the properties of the interstellar medium, and the propagation of cosmic rays in the local galactic medium. Measurements of interstellar neutral atoms by Ulysses for He and by SOHO/SWAN for H provided some o…
ACS experiment for atmospheric studies on "ExoMars-2016" Orbiter
Montmessin, F.; Fedorova, A. A.; Shakun, A. V. +6 more
ACS is a set of spectrometers for atmospheric studies (Atmospheric Chemistry Suite). It is one of the Russian instruments for the Trace Gas Orbiter (TGO) of the Russian-European "ExoMars" program. The purpose of the experiment is to study the Martian atmosphere by means of two observations regimes: sensitive trace gases measurements in solar occul…
Spatially resolved kinematic observations of the planetary nebulae Hen 3-1333 and Hen 2-113.
Parker, Q. A.; Danehkar, A.
We have performed integral field spectroscopy of the planetary nebulae Hen 3-1333 (PNG332.9-09.9) and Hen 2-113 (PNG321.0+03.9), which are unusual in exhibiting dual-dust chemistry and multipolar lobes but also ionized by late-type [WC 10] central stars. The spatially resolved velocity distributions of the Hα emission line were used to determine t…
Theoretical Clues to the Ultraviolet Diversity of Type Ia Supernovae
Baron, E.; Wang, Lifan; Milne, Peter +2 more
The effect of metallicity on the observed light of Type Ia supernovae (SNe Ia) could lead to systematic errors as the absolute magnitudes of local and distant SNe Ia are compared to measure luminosity distances and determine cosmological parameters. The UV light may be especially sensitive to metallicity, though different modeling methods disagree…
What powers Lyα blobs?
Menten, K. M.; Omont, A.; Lagache, G. +14 more
Lyα blobs (LABs) are spatially extended Lyα nebulae seen at high redshift. The origin of Lyα emission in the LABs is still unclear and under debate. To study their heating mechanism(s), we present Australia Telescope Compact Array (ATCA) observations of the 20 cm radio emission and Herschel PACS and SPIRE measurements of the far-infrared (FIR) emi…
Discovery of true, likely and possible symbiotic stars in the dwarf spheroidal NGC 205
Gonçalves, Denise R.; Akras, Stavros; Magrini, Laura +1 more
In this paper we discuss the photometric and spectroscopic observations of newly discovered (symbiotic) systems in the dwarf spheroidal galaxy NGC 205. The Gemini Multi-Object Spectrograph on-off band [O III] 5007 Å emission imaging highlighted several [O III] line emitters, for which optical spectra were then obtained. The detailed study of the s…
A Chandra Search for a Pulsar Wind Nebula around PSR B1055-52
Pavlov, G. G.; Posselt, B.; Spence, G.
The nearby, middle-aged PSR B1055-52 has many properties in common with the Geminga pulsar. Motivated by the Geminga's enigmatic and prominent pulsar wind nebula (PWN), we searched for extended emission around PSR B1055-52 with Chandra ACIS. For an energy range 0.3-1 keV, we found a 4σ flux enhancement in a 4\buildrel{\prime\prime}\over{.} 9-20
Dynamical masses of a nova-like variable on the edge of the period gap
Gänsicke, B. T.; Dhillon, V. S.; Marsh, T. R. +12 more
We present the first dynamical determination of the binary parameters of an eclipsing SW Sextantis star in the 3-4 h orbital period range during a low state. We obtained time-resolved optical spectroscopy and photometry of HS 0220+0603 during its 2004-2005 low-brightness state, as revealed in the combined Small & Moderate Aperture Research Tel…