Search Publications
Detailed study of SNR G306.3-0.9 using XMM-Newton and Chandra observations
Miceli, M.; Combi, J. A.; García, F. +3 more
Aims: We aim to study the spatial distribution of the physical and chemical properties of the X-ray emitting plasma of the supernova remnant (SNR) G306.3-0.9 in detail to obtain constraints on its ionization stage, the progenitor supernova explosion, and the age of the remnant.
Methods: We used combined data from XMM-Newton and Chandra o…
The far-infrared emission of the radio-loud quasar 3C 318
Peletier, R. F.; Barthel, P. D.; Podigachoski, P. +1 more
3C 318, a radio-loud quasar at z = 1.574, is a subgalactic-sized radio source, and a good test-bed for the interplay between black hole and galaxy growth in the high-z Universe. Based on its IRAS, ISO, and SCUBA detections, it has long been considered as one of the most intrinsically luminous (LIR > 1013 L⊙) inf…
The peculiar optical-UV X-ray spectra of the X-ray weak quasar PG 0043+039
Talavera, A.; Schartel, N.; Rodríguez-Pascual, P. M. +4 more
Context. The object PG 0043+039 has been identified as a broad absorption line (BAL) quasar based on its UV spectra. However, this optical luminous quasar has not been detected before in deep X-ray observations, making it the most extreme X-ray weak quasar known today.
Aims: This study aims to detect PG 0043+039 in a deep X-ray exposure. The …
Microwave observations of a large-scale coronal wave with the Nobeyama radioheliograph
Mann, G.; Shibasaki, K.; Warmuth, A. +1 more
Context. Large-scale globally propagating waves in the solar corona have been studied extensively, mainly using extreme ultraviolet (EUV) observations. In a few events, corresponding wave signatures have been detected in microwave radioheliograms provided by the Nobeyama radioheliograph (NoRH). Several aspects of these observations seem to contrad…
Characterizing elusive, faint dusty star-forming galaxies: a lensed, optically undetected ALMA galaxy at z 3.3
Berta, S.; Daddi, E.; Elbaz, D. +19 more
We present the serendipitous ALMA detection of a faint submillimeter galaxy (SMG) lensed by a foreground z 1 galaxy. By optimizing the source detection to deblend the system, we accurately build the full spectral energy distribution of the distant galaxy from the I814 band to radio wavelengths. It is extremely red, with a I-K colour larger than 2.…
Exploring high-z galaxies with the E-ELT
Gullieuszik, M.; Falomo, R.; Greggio, L. +2 more
We present simulated observations of galaxies at z = 2 and z = 3 to probe the capabilities of next-generation telescopes (E-ELT and JWST) to measure the structural and photometrical properties of high-redshift galaxies. We carry out an extensive set of simulations of high-redshift galaxies adopting the specifications of the E-ELT first light instr…
Radiation-driven winds of hot luminous stars. XVIII. The unreliability of stellar and wind parameter determinations from optical vs. UV spectral analysis of selected central stars of planetary nebulae and the possibility of some CSPNs as single-star supernova Ia progenitors
Pauldrach, A. W. A.; Kaschinski, C. B.; Hoffmann, T. L.
Context. The uncertainty in the degree to which radiation-driven winds of hot stars might be affected by small inhomogeneities in the density leads to a corresponding uncertainty in the determination of the atmospheric mass loss rates from the strength of optical recombination lines and - since the mass loss rate is not a free parameter but a func…
Star formation in a diffuse high-altitude cloud?
Kerp, J.; Lenz, D.; Röhser, T.
Context. A recent discovery of two stellar clusters associated with the diffuse high-latitude cloud HRK 81.4-77.8 has important implications for star formation in the Galactic halo.
Aims: We derive a plausible distance estimate to HRK 81.4-77.8 primarily from its gaseous properties.
Methods: We spatially correlate state-of-the-art HI, fa…
Iron-rich solar particle events measured by SOHO/ERNE during two solar cycles
Vainio, R.; Valtonen, E.; Raukunen, O.
Aims: We study the differences in the heavy ion composition of solar energetic particle (SEP) events between solar cycles 23 and 24.
Methods: We have surveyed the SOHO/ERNE heavy ion data from the beginning of solar cycle 23 until the end of June 2015, that is, well into the declining phase of cycle 24. We used this long observation peri…
Searching for supergiant fast X-ray transients with Swift
D'Avanzo, P.; Campana, S.; Sbarufatti, B. +11 more
Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) hosting a neutron star and an OB supergiant companion. We examine the available Swift data, as well as other new or archival/serendipitous data, on three sources: IGR J17407-2808, 2XMM J185114.3-000004, and IGR J18175-2419, whose X-ray characteristics qualify them as can…