Search Publications
Missions
Journals
Publication Years
Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
Szkody, Paula; Sion, Edward M.; Godon, Patrick +6 more
Time-tag ultraviolet data obtained on the Hubble Space Telescope in 2013 reveal interesting variability related to the white dwarf spin in the two cataclysmic variables RZ Leo and CC Scl. RZ Leo shows a period at 220 s and its harmonic at 110 s, thus identifying it as a likely Intermediate Polar (IP). The spin signal is not visible in a short sing…
Panchromatic spectral energy distributions of simulated galaxies: results at redshift z = 0
Annunziatella, Marianna; Obreja, Aura; Granato, Gian Luigi +5 more
We present predictions of spectral energy distributions (SEDs), from the UV to the FIR, of simulated galaxies at z = 0. These were obtained by post-processing the results of an N-body+hydro simulation of a cosmological box of side 25 Mpc, which uses the Multi-Phase Particle Integrator (MUPPI) for star formation and stellar feedback, with the grasi…
Propagation Characteristics of Two Coronal Mass Ejections from the Sun Far into Interplanetary Space
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
Propagation of coronal mass ejections (CMEs) from the Sun far into interplanetary space is not well understood, due to limited observations. In this study we examine the propagation characteristics of two geo-effective CMEs, which occurred on 2005 May 6 and 13, respectively. Significant heliospheric consequences associated with the two CMEs are ob…
Study of the progenitor of the magnetar 1E 2259+586 through Suzaku observations of the associated supernova remnant CTB 109
Enoto, Teruaki; Makishima, Kazuo; Nakano, Toshio +4 more
We present a study of the progenitor of the magnetar 1E 2259+586, from Suzaku observations of the associated supernova remnant CTB 109. The Suzaku spectra, either spatially integrated or spatially resolved, were successfully described by a two-component plasma model, which reconfirms a previous Chandra result on the northwestern part of this remna…
X-ray lags in PDS 456 revealed by Suzaku observations
Fabian, A. C.; Reynolds, C. S.; Cackett, E. M. +5 more
X-ray reverberation lags from the vicinity of supermassive black holes have been detected in almost 30 active galactic nuclei (AGNs). The soft lag, which is the time delay between the hard and soft X-ray light curves, is usually interpreted as the time difference between the direct and reflected emission, but is alternatively suggested to arise fr…
Outgas analysis of mechanical cryocoolers for long lifetime
Nakagawa, Takao; Mitsuda, Kazuhisa; Kanao, Kenichi +9 more
Mechanical cryocoolers for space applications are required to have high reliability to achieve long-term operation in orbit. ASTRO-H (Hitomi), the 6th Japanese X-ray astronomy mission, has a major scientific instrument onboard-the Soft X-ray Spectrometer (SXS) with several 20K-class two-stage Stirling (2ST) coolers and a 4K-class Joule Thomson (JT…
Coronal X-ray emission and planetary irradiation in HD 209458
Schmitt, J. H. M. M.; Czesla, S.; Salz, M. +2 more
HD 209458 is one of the benchmark objects in the study of hot Jupiter atmospheres and their evaporation through planetary winds. The expansion of the planetary atmosphere is thought to be driven by high-energy extreme ultraviolet (EUV) and X-ray irradiation. We obtained new Chandra High Resolution Camera (HRC-I) data, which unequivocally show that…
Tethered Prominence-CME Systems Captured during the 2012 November 13 and 2013 November 3 Total Solar Eclipses
Habbal, Shadia R.; Druckmüller, Miloslav; Alzate, Nathalia +1 more
We report on white light observations of high latitude tethered prominences acquired during the total solar eclipses of 2012 November 13 and 2013 November 3, at solar maximum, with a field of view spanning several solar radii. Distinguished by their pinkish hue, characteristic of emission from neutral hydrogen and helium, the four tethered promine…
An Improved Method for Determining the Integrated Properties of Nuclear Rings: NGC 1512
Ho, Luis C.; de Grijs, Richard; Ma, Chao
The integrated properties of nuclear rings are correlated with the secular evolution and dynamics of the host galaxies of the rings, as well as with the formation and evolution of the rings’ star cluster population(s). Here we present a new method to accurately measure the spectral energy distribution and current star formation rate (SFR) of the n…
An Evolving GeV Spectrum from Prompt to Afterglow: The Case of GRB 160509A
Tang, Qing-Wen; Wang, Xiang-Yu; Tam, Pak-Hin Thomas +1 more
We present the high-energy emission properties of GRB 160509A, from its prompt mission to late afterglow phase. GRB 160509A contains two emission episodes: 0-40 s and 280-420 s after the burst onset ({t}0). The relatively high fluence of GRB 160509A allows us to establish an evolving spectrum above 100 MeV. During the first emission epi…