Search Publications
The Suzaku broadband X-ray spectrum of the dwarf Seyfert galaxy NGC 4395
Iwasawa, K.; Gallo, L. C.; Tanaka, Y.
We present a Suzaku observation of the dwarf Seyfert galaxy NGC 4395 with an estimated black hole mass of ~105 M⊙. Rapid and strong X-ray variability with an rms amplitude of ~60 per cent is observed in the 0.4-10 keV band with the XIS cameras. The shape of the light curve appears to depend on energies. The hard X-ray emissio…
A far-ultraviolet variability survey of the globular cluster M80
Knigge, C.; Long, K. S.; Zurek, D. R. +2 more
We have searched for variable sources in the core region of M80, using far-ultraviolet (FUV) data taken with the Advanced Camera for Surveys on board the Hubble Space Telescope. We found three sources that exhibit strong signs of variability in our data. Among these is source TDK1, which we believe to be an RRLyrae star that reached maximum bright…
Suzaku observations of X-ray excess emission in the cluster of galaxies A 3112
Kaastra, J.; Bonamente, M.; Nevalainen, J. +2 more
Aims: We analysed the Suzaku XIS1 data of the A 3112 cluster of galaxies in order to examine the X-ray excess emission in this cluster reported earlier with the XMM-Newton and Chandra satellites.
Methods: We performed X-ray spectroscopy on the data of a single large region. We carried out simulations to estimate the systematic uncertaint…
Monte Carlo modeling of Io’s [OI] 6300 Å and [SII] 6716 Å auroral emission in eclipse
Stapelfeldt, K.; Trafton, L. M.; Moore, C. +4 more
We present a Monte Carlo (MC) model of [OI] 6300 Å and [SII] 6716 Å emission from Io entering eclipse. The simulation accounts for the 3-D distribution of SO 2, O, SO, S, and O 2 in Io's atmosphere, several volcanic plumes, and the magnetic field around Io. Thermal electrons from the jovian plasma torus are input along the si…
Water Production Rate of the Jupiter-Family Comet 46P/Wirtanen in the 2008 Apparition with the Subaru Telescope/IRCS
Kawakita, Hideyo; Kobayashi, Hitomi
We present the water production rate of comet 46P/Wirtanen in its 2008 apparition, determined from high-dispersion near-infrared spectroscopic observations. Comet 46P/Wirtanen, one of Jupiter-family comets, was the target of the ROSETTA mission in the past. Observations of comet 46P were carried out in the middle of 2008 February with the Subaru t…
HerMES: The submillimeter spectral energy distributions of Herschel/SPIRE-detected galaxies
Altieri, B.; Aussel, H.; Elbaz, D. +75 more
We present colours of sources detected with the Herschel/SPIRE instrument in deep extragalactic surveys of the Lockman Hole, Spitzer-FLS, and GOODS-N fields in three photometric bands at 250, 350 and 500 µm. We compare these with expectations from the literature and discuss associated uncertainties and biases in the SPIRE data. We identify a…
X-ray Outflows in the Swift Burst Alert Detected Seyfert 1s
Winter, Lisa M.
Previous surveys of outflows in low-redshift active galactic nuclei (AGNs) have relied on the analysis of sources selected primarily for their optical/X-ray brightness and are therefore biased. Toward determining the outflow properties of local AGNs, we detect warm absorption signatures of O VII and O VIII absorption edges in the available Suzaku/…
Electron-impact excitation heating rates in the atmosphere of Titan
Campbell, L.; Kato, H.; Brunger, M. J. +1 more
A previous study of various heating rates in the atmosphere of Titan included electron-impact excitation of molecular nitrogen as one component. This work examines this component in more detail, using a statistical equilibrium calculation to avoid approximations made in the earlier work. The sensitivity of the results to different cross-section se…
XMM-Newton long-look observation of the narrow-line Seyfert 1 galaxy PKS 0558-504. II. Timing analysis
Papadakis, I. E.; Brinkmann, W.; Gliozzi, M. +1 more
Context. PKS 0558-504 has been observed repeatedly by XMM-Newton as a calibration and performance verification target. In this work, we present results from the power spectral analysis using data from a long XMM-Newton observation and archival RXTE data.
Aims: To search for periodic and/or quasi-periodic signals, to estimate the power spectru…
Reconfiguration of the coronal magnetic field by means of reconnection driven by photospheric magnetic flux convergence
Tu, C. -Y.; Marsch, E.; Tian, H. +2 more
Context. Magnetic reconnection is commonly believed to be responsible for flare-like events and plasma ejections in the solar atmosphere, but the field-line reconfiguration observed in association with magnetic reconnection has rarely been observed before.
Aims: We attempt to reconstruct the configuration of the magnetic field during a magnet…