Search Publications
Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354
Götz, D.; Moretti, A.; Sidoli, L. +5 more
We report on the discovery of pulsations at a period of ∼47 s in the persistent X-ray source 1RXS J225352.8+624354 (1RXS J2253) using five Chandra observations performed in 2009. The signal was also detected in Swift and ROSAT data, allowing us to infer over a 16-yr baseline an average, long-term period increasing rate of ≈17 ms per year and there…
2006 May-July major radio flare episodes in Cygnus X-3: spectrotiming analysis of the X-ray data
Droulans, R.; Koljonen, K. I. I.; Hannikainen, D. C. +1 more
We analyse in detail the X-ray data of the microquasar Cygnus X-3 obtained during major radio flaring episodes in 2006 with multiple observatories. The analysis consists of two parts: probing the fast (∼1 min) X-ray spectral evolution with principal component analysis followed by subsequent spectral fits to the time-averaged spectra (∼3 ks). Based…
Investigating the Presence of 500 µm Submillimeter Excess Emission in Local Star Forming Galaxies
Kirkpatrick, Allison; Calzetti, Daniela; Walter, Fabian +10 more
Submillimeter excess emission has been reported at 500 µm in a handful of local galaxies, and previous studies suggest that it could be correlated with metal abundance. We investigate the presence of an excess submillimeter emission at 500 µm for a sample of 20 galaxies from the Key Insights on Nearby Galaxies: a Far Infrared Survey wi…
Modelling the asymmetric wind of the luminous blue variable binary MWC 314
Jorissen, A.; Frémat, Y.; Lobel, A. +12 more
Aims: We present a spectroscopic analysis of MWC 314, a luminous blue variable (LBV) candidate with an extended bipolar nebula. The detailed spectroscopic variability is investigated to determine if MWC 314 is a massive binary system with a supersonically accelerating wind or a low-mass B[e] star. We compare the spectrum and spectral energy d…
Metal-mass-to-light Ratios of the Perseus Cluster Out to the Virial Radius
Simionescu, A.; Matsushita, K.; Sato, K. +2 more
We analyzed XMM-Newton data of the Perseus cluster out to ~1 Mpc, or approximately half the virial radius. Using the flux ratios of Lyα lines of H-like Si and S to Kα line of He-like Fe, the abundance ratios of Si/Fe and S/Fe of the intracluster medium (ICM) were derived using the APEC plasma code v2.0.1. The temperature dependence of the line rat…
A census of quasar-intrinsic absorption in the Hubble Space Telescope archive: systems from high-resolution echelle spectra
Charlton, Jane C.; Masiero, Joseph R.; Tripp, Todd M. +9 more
We present a census of zabs ≲ 2 intrinsic (those showing partial coverage) and associated (zabs ∼ zem) quasar absorption-line systems detected in the Hubble Space Telescope archive of Space Telescope Imaging Spectrograph echelle spectra. This work complements the Misawa et al. survey of 2 < zem < 4…
Distance and Proper Motion Measurement of the Red Supergiant, PZ Cas, in Very Long Baseline Interferometry H2O Maser Astrometry
Asaki, Y.; Imai, H.; Oyama, T. +1 more
We present the very long baseline interferometry H2O maser monitoring observations of the red supergiant, PZ Cas, at 12 epochs from 2006 April to 2008 May. We fitted maser motions to a simple model composed of a common annual parallax and linear motions of the individual masers. The maser motions with the parallax subtracted were well m…
Ultraviolet and X-ray variability of NGC 4051 over 45 days with XMM-Newton and Swift
Vaughan, S.; Uttley, P.; Alston, W. N.
We analyse 15 XMM-Newton observations of the Seyfert galaxy NGC 4051 obtained over 45 d to determine the ultraviolet (UV) light curve variability characteristics and search for correlated UV/X-ray emission. The UV light curve shows variability on all time-scales, however with lower fractional rms than the 0.2-10 keV X-rays. On days-weeks time-scal…
Ground-based near-infrared observations of water vapour in the Venus troposphere
Crisp, David; Bailey, Jeremy; Chamberlain, Sarah +1 more
We present a study of water vapour in the Venus troposphere obtained by modelling specific water vapour absorption bands within the 1.18 µm window. We compare the results with the normal technique of obtaining the abundance by matching the peak of the 1.18 µm window. Ground-based infrared imaging spectroscopy of the night side of Venus…
Intragroup and Galaxy-linked Diffuse X-Ray Emission in Hickson Compact Groups
Charlton, Jane C.; Brandt, William N.; Zabludoff, Ann I. +9 more
Isolated compact groups (CGs) of galaxies present a range of dynamical states, group velocity dispersions, and galaxy morphologies with which to study galaxy evolution, particularly the properties of gas both within the galaxies and in the intragroup medium. As part of a large, multiwavelength examination of CGs, we present an archival study of di…