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Long-term Spectral Variability of the Ultraluminous X-Ray Source Holmberg IX X-1
Jithesh, V.; Wang, Zhongxiang; Misra, Ranjeev
We investigate the long-term spectral variability in the ultraluminous X-ray source Holmberg IX X-1. By analyzing the data from 8 Suzaku and 13 XMM-Newton observations conducted between 2001 and 2015, we perform a detailed spectral modeling for all spectra with simple models and complex physical models. We find that the spectra can be well explain…
Excess entropy and energy feedback from within cluster cores up to r200
Ettori, Stefano; Eckert, Dominique; Majumdar, Subhabrata +3 more
We estimate the 'non-gravitational' entropy-injection profiles, ΔK, and the resultant energy feedback profiles, ΔE, of the intracluster medium for 17 clusters using their Planck Sunyaev-Zel'dovich and ROSAT X-ray observations, spanning a large radial range from 0.2r500 up to r200. The feedback profiles are estimated by compar…
Observational study on the fine structure and dynamics of a solar jet. I. Energy build-up process around a satellite spot
Shibata, Kazunari; Ichimoto, Kiyoshi; Ueno, Satoru +3 more
We report on a solar jet phenomenon associated with successive flares on 2014 November 10. These explosive events were involved with the satellite spots' emergence around a δ-type sunspot in the decaying active region NOAA 12205. The data for this jet were provided by the Solar Dynamics Observatory, the X-Ray Telescope aboard Hinode, and the Inter…
The most massive galaxies in clusters are already fully grown at z ∼ 0.5
Davies, Roger L.; Houghton, R. C. W.; Oldham, L. J.
By constructing scaling relations for galaxies in the massive cluster MACSJ0717.5 at z = 0.545 and comparing with those of Coma, we model the luminosity evolution of the stellar populations and the structural evolution of the galaxies. We calculate magnitudes, surface brightnesses and effective radii using Hubble Space Telescope (HST)/ACS images a…
Occurrence rate of dipolarization fronts in the plasma sheet: Cluster observations
Plaschke, Ferdinand; Zhang, Tielong; Volwerk, Martin +6 more
We investigate the occurrence rate of dipolarization fronts (DFs) in the plasma sheet by taking full advantage of all four Cluster satellites (C1-4) from years 2001 to 2009. In total, we select 466 joint-observation DF events, in which 318, 282, 254, and 236 DFs are observed by C1, C2, C3, and C4, respectively. Our findings are as follows: (1) the…
Distance determination method of dust particles using Rosetta OSIRIS NAC and WAC data
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +42 more
The ESA Rosetta spacecraft has been tracking its target, the Jupiter-family comet 67P/Churyumov-Gerasimenko, in close vicinity for over two years. It hosts the OSIRIS instruments: the Optical, Spectroscopic, and Infrared Remote Imaging System composed of two cameras, see e.g. Keller et al. (2007). In some imaging sequences dedicated to observe dus…
Low-frequency oscillatory flow signatures and high-speed flows in the Earth's magnetotail
Nilsson, H.; Hamrin, M.; Norqvist, P. +6 more
Using plasma sheet data from Cluster 1 spacecraft from 2001 till 2011, we statistically investigate oscillatory signatures in the plasma bulk flow. These periodic oscillations are compared to high-speed and quiet flows. Periodic oscillations are observed approximately 8% of the time, while high-speed flows and quiet flows are observed around 0.5% …
INRRI-EDM/2016: the first laser retroreflector on the surface of Mars
Marchetti, E.; Flamini, E.; Mugnuolo, R. +18 more
During Summer 2015 the SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and cube/microsat Characterization Facilities Laboratory, http://www.lnf.infn.it/esperimenti/etrusco, Team of INFN-LNF, with support by ASI, carried out an intense activity of final design, manufacturing and testing in order to construct, space qualify and finally integra…
Relation between the parameters of dust and of molecular and atomic gas in extragalactic star-forming regions
Smirnova, K. I.; Wiebe, D. S.; Sobolev, A. M. +1 more
The relationships between atomic and molecular hydrogen and dust of various sizes in extragalactic star-forming regions are considered, based on observational data from the Spitzer and Herschel infrared space telescopes, the Very Large Array (atomic hydrogen emission) and IRAM (CO emission). The source sample consists of approximately 300 star-for…
Starburst-driven Superwinds in Quasar Host Galaxies
Haas, Martin; Barthel, Peter; Wilkes, Belinda +1 more
During the past five decades astronomers have been puzzled by the presence of strong absorption features including metal lines, observed in the optical and ultraviolet spectra of quasars, signaling inflowing and outflowing gas winds with relative velocities up to several thousands of km s-1. In particular, the location of these winds—cl…