Search Publications
Bandwidths and amplitudes of chorus-like banded emissions measured by the TC-1 Double Star spacecraft
Santolík, O.; Yearby, K. H.; Cornilleau-Wehrlin, N. +1 more
Characteristics of banded whistler-mode emissions are derived from a database of chorus-like events obtained from the complete data set of the wave measurements provided by the Spatio-Temporal Analysis of Field Fluctuation-Digital Wave Processing (STAFF-DWP) wave instrument on board the TC-1 Double Star spacecraft. Our study covers the full operat…
The Role of Bulge Formation in the Homogenization of Stellar Populations at z~2 as revealed by Internal Color Dispersion in CANDELS
Giavalisco, M.; Papovich, C.; Koekemoer, A. M. +13 more
We use data from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey to study how the spatial variation in the stellar populations of galaxies relates to the formation of galaxies at 1.5\lt z\lt 3.5. We use the internal color dispersion (ICD), measured between the rest-frame UV and optical bands, which is sensitive to age (and dust …
X-ray galaxy clusters abundance and mass temperature scaling
Blanchard, Alain; Douspis, Marian; Ilić, Stéphane
The abundance of clusters of galaxies is known to be a potential source of cosmological constraints through their mass function. In the present work, we examine the information that can be obtained from the temperature distribution function of X-ray clusters. For this purpose, the mass-temperature (M - T) relation and its statistical properties ar…
Outflow of low-energy O+ ion beams observed during periods without substorms
Dandouras, I.; Rème, H.; Parks, G. K. +5 more
Numerous observations have shown that ions flow out of the ionosphere during substorms with more fluxes leaving as the substorm intensity increases (Wilson et al., 2004). In this article we show observations of low-energy (few tens of electron volts) ionospheric ions flowing out periods without substorms, determined using the Wideband Imaging Came…
Exploring the Possibility of O and Ne Contamination in Ulysses Observations of Interstellar Helium
Wood, Brian E.; Müller, Hans-Reinhard; Möbius, Eberhard +4 more
We explore the possibility that interstellar O and Ne may be contributing to the particle signal from the GAS instrument on Ulysses, which is generally assumed to be entirely He. Motivating this study is the recognition that an interstellar temperature higher than any previously estimated from Ulysses data could potentially resolve a discrepancy b…
The Stellar Mass-Halo Mass Relation for Low-mass X-Ray Groups At 0.5< z< 1 in the CDFS With CSI
Kelson, Daniel D.; McCarthy, Patrick J.; Dressler, Alan +4 more
Since z∼ 1, the stellar mass density locked in low-mass groups and clusters has grown by a factor of ∼8. Here, we make the first statistical measurements of the stellar mass content of low-mass X-ray groups at 0.5\lt z\lt 1, enabling the calibration of stellar-to-halo mass scales for wide-field optical and infrared surveys. Groups are selected fro…
Modeling of Hot Plasma in the Solar Active Region Core
Schmelz, J. T.; Pathak, S.; Imada, S. +2 more
Magnetically confined plasma with temperatures ≥slant 5 {MK} are a feature of hot coronal loops observed in the core of active regions. In this paper, using observations and MHD modeling of coronal loops, we investigate whether wave heating (Alternating Current) models can describe the high temperature loops observed in the active region of 2012 S…
Two Candidate Optical Counterparts of M82 X-1 from HST Observations
Liu, Jifeng; Bai, Yu; Wang, Song +1 more
Optical counterparts can provide significant constraints on the physical nature of ultraluminous X-ray sources (ULXs). In this Letter, we identify six point sources in the error circle of a ULX in M82, namely M82 X-1, by registering Chandra positions onto Hubble Space Telescope images. Two objects are considered as optical counterpart candidates o…
Mass and Energy of Erupting Solar Plasma Observed with the X-Ray Telescope on Hinode
Moon, Yong-Jae; Reeves, Katharine K.; Raymond, John C. +2 more
We investigate seven eruptive plasma observations by Hinode/XRT. Their corresponding EUV and/or white light coronal mass ejection features are visible in some events. Five events are observed in several passbands in X-rays, which allows for the determination of the eruptive plasma temperature using a filter ratio method. We find that the isotherma…
Multiple AGN in the crowded field of the compact group SDSS J0959+1259
Bianchi, S.; Vignali, C.; Piconcelli, E. +11 more
We present a multiwavelength study of a newly discovered compact group (CG), SDSS J0959+1259, based data from XMM-Newton, Sloan Digital Sky Survey (SDSS) and the Calar Alto optical imager BUSCA. With a maximum velocity offset of 500 km s-1, a mean redshift of 0.035, and a mean spatial extension of 480 kpc, this CG is exceptional in havi…