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…
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…
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…
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…
A new determination of the INTEGRAL/IBIS point source location accuracy
Hill, A. B.; Bird, A. J.; Scaringi, S. +6 more
Aims: We determine the point source location accuracy (PSLA) of the INTEGRAL/IBIS telescope based on analysis of archival in-flight data.
Methods: Over 40 000 individual pointings (science windows) of INTEGRAL/IBIS data were analysed using the latest Off-line Science Analysis software (version 7.0). Reconstructed source positions were th…
Properties of dust in the high-latitude translucent cloud L1780. II. 3D radiative transfer modelling
Juvela, M.; Ridderstad, M.
Context. Lynds 1780 is a high-latitude cloud where, based on 2MASS, the maximum visual extinction is AVmax = 4 mag at a resolution of 3'. In LDN1780, increased far-infrared (FIR) emissivity of dust grains has been observed, and the infrared emission is found to peak at different locations at different wavelengths.
Aims: …
VLT/NACO near-infrared imaging and spectroscopy of N88A in the SMC
Heydari-Malayeri, M.; Kristensen, L. E.; Lemaire, J. L. +3 more
Aims: We present near-infrared imaging and spectroscopic high spatial resolution observations of the SMC region N88 containing the bright, excited, extincted and compact H II region N88A of the size of about 1 pc.
Methods: To investigate its stellar content and reddening, N88 was observed using spectroscopy and imagery in the JHKs- and L…
Infrared photometry and evolution of mass-losing AGB stars. III. Mass loss rates of MS and S stars
Guandalini, R.
Context. The asymptotic giant branch (AGB) phase marks the end of the evolution for low- and intermediate-mass stars, which are fundamental contributors to the mass return to the interstellar medium and to the chemical evolution of galaxies. The detailed understanding of mass loss processes is hampered by the poor knowledge of the luminosities and…
Pre-main sequence stars in the stellar association N11 in the Large Magellanic Cloud
Chiosi, E.; Vallenari, A.; Sordo, R.
Context. Magellanic Clouds are of extreme importance to the study of the star formation process in low metallicity environments.
Aims: In this paper we report on the discovery of pre-main sequence candidates and young embedded stellar objects in N11 located in the Large Magellanic Cloud to cast light on the star formation scenario. We would l…