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Are CME-Related Dimmings Always a Simple Signature of Interplanetary Magnetic Cloud Footpoints?
Mandrini, C. H.; van Driel-Gesztelyi, L.; Démoulin, P. +4 more
Coronal dimmings are often present on both sides of erupting magnetic configurations. It has been suggested that dimmings mark the location of the footpoints of ejected flux ropes and, thus, their magnetic flux can be used as a proxy for the flux involved in the ejection. If so, this quantity can be compared to the flux in the associated interplan…
Supernovae in the Subaru Deep Field: an initial sample and Type Ia rate out to redshift 1.6
Sharon, K.; Gal-Yam, A.; Filippenko, A. V. +12 more
Large samples of high-redshift supernovae (SNe) are potentially powerful probes of cosmic star formation, metal enrichment and SN physics. We present initial results from a new deep SN survey, based on re-imaging in the R, i', z' bands, of the 0.25 deg2 Subaru Deep Field (SDF), with the 8.2-m Subaru telescope and Suprime-Cam. In a singl…
Resolving the Unresolved Cosmic X-Ray Background in the Chandra Deep Fields
Hickox, Ryan C.; Markevitch, Maxim
We present a measurement of the surface brightness of the cosmic X-ray background (CXB) in the Chandra Deep Fields, after excluding all detected X-ray, optical, and infrared sources. The work is motivated by a recent X-ray stacking analysis by Worsley and collaborators, which showed that galaxies detected by HST but not by Chandra may account for …
On the Putative Detection of z > 0 X-Ray Absorption Features in the Spectrum of Mrk 421
Rasmussen, Andrew P.; Kahn, Steven M.; Paerels, Frits +3 more
In a series of papers, Nicastro et al. have reported the detection of z>0 O VII absorption features in the spectrum of Mrk 421 obtained with the Chandra Low Energy Transmission Grating Spectrometer (LETGS). We evaluate this result in the context of a high-quality spectrum of the same source obtained with the Reflection Grating Spectrometer (RGS…
Saturn's icy satellites investigated by Cassini-VIMS. I. Full-disk properties: 350 5100 nm reflectance spectra and phase curves
Sotin, C.; Brown, R. H.; Baines, K. H. +26 more
Saturn's icy satellites are among the main scientific objectives of the Cassini-VIMS (Visual and Infrared Mapping Spectrometer) experiment. This paper contains a first systematic and comparative analysis of the full-disk spectral properties of Dione, Enceladus, Epimetheus, Hyperion, Iapetus, Mimas, Phoebe, Rhea and Tethys as observed by VIMS from …
The Evolution of the Field and Cluster Morphology-Density Relation for Mass-Selected Samples of Galaxies
Kelson, D. D.; Wuyts, S.; Ford, H. C. +7 more
The Sloan Digital Sky Survey (SDSS) and photometric/spectroscopic surveys in the GOODS-South field (the Chandra Deep Field-South, CDF-S) are used to construct volume-limited, stellar-mass-selected samples of galaxies at redshifts 0<z<1. The CDF-S sample at 0.6<z<1.0 contains 207 galaxies complete down to M=4×1010 Msolar…
A Subaru Weak-Lensing Survey. I. Cluster Candidates and Spectroscopic Verification
Refregier, Alexandre; Ellis, Richard S.; Miyazaki, Satoshi +4 more
We present the results of an ongoing weak-lensing survey conducted with the Subaru Telescope whose initial goal is to locate and study the distribution of shear-selected structures, or halos. Using a Suprime-Cam imaging survey spanning 21.82 deg2, we present a catalog of 100 candidate halos located from lensing-convergence maps. Our sam…
The SSS Phase of RS Ophiuchi Observed with Chandra and XMM-Newton. I. Data and Preliminary Modeling
Ness, J. -U.; Gehrz, R. D.; Gonzalez-Riestra, R. +13 more
The phase of supersoft source (SSS) emission of the sixth recorded outburst of the recurrent nova RS Oph was observed on days 39.7 and 66.9 after outburst with Chandra and on day 54.0 with XMM-Newton. A ~35 s period on day 54.0 originates from the SSS emission and not from the shock. We discuss the bound-free absorption by neutral elements in the …
Properties of sunspots in cycle 23. I. Dependence of brightness on sunspot size and cycle phase
Solanki, S. K.; Martínez Pillet, V.; Krivova, N. A. +1 more
Aims:In this paper we investigate the dependence of umbral core brightness, as well as the mean umbral and penumbral brightness on the phase of the solar cycle and on the size of the sunspot.
Methods: Albregtsen & Maltby (1978, Nature, 274, 41) reported an increase in umbral core brightness from the early to the late phase of solar cycle f…
A Floor in the Solar Wind Magnetic Field
Cliver, E. W.; Svalgaard, L.
Long-term (~130 years) reconstruction of the interplanetary magnetic field (IMF) based on geomagnetic indices indicates that the solar wind magnetic field strength has a ``floor,'' a baseline value in annual averages that it approaches at each 11 yr solar minimum. In the ecliptic plane at 1 AU, the IMF floor is ~4.6 nT, a value substantiated by di…