Search Publications
Evolutionary paths among different red galaxy types at 0.3 < z < 1.5 and the late buildup of massive E-S0s through major mergers
Barro, Guillermo; Pérez-González, Pablo G.; Eliche-Moral, M. Carmen +11 more
Some recent observations seem to disagree with hierarchical theories of galaxy formation about the role played by major mergers in the late buildup of massive E-S0s. We re-address this question by analysing the morphology, structural distortion level and star formation enhancement of a sample of massive galaxies (M* > 5 × 1010
The NGC 5253 star cluster system - I. Standard modelling and infrared-excess sources
Östlin, Göran; de Grijs, Richard; Zackrisson, Erik +1 more
Using high-resolution Hubble Space Telescope data, we re-examine the fundamental properties (ages, masses and extinction values) of the rich star cluster population in the dwarf starburst galaxy NGC 5253. The gain in resolution compared to previous studies is of order a factor of 2 in both spatial dimensions, while our accessible wavelength range …
Very deep spectroscopy of the bright Saturn nebula NGC 7009 - II. Analysis of the rich optical recombination spectrum
Liu, X. -W.; Fang, X.
In Paper I, we presented a deep, long-slit spectrum of the bright Saturn nebula NGC 7009. Numerous permitted lines emitted by the C+, N+, O+ and Ne+ ions were detected. Gaussian profile fitting to the spectrum yielded more than 1000 lines, the majority of which are optical recombination lines (ORLs) of h…
Starburst and old stellar populations in the z ≃ 3.8 radio galaxies 4C 41.17 and TN J2007-1316
Seymour, N.; Nesvadba, N.; De Breuck, C. +6 more
Using the new evolutionary code PÉGASE.3, we undertook an evolutionary spectral synthesis of the optical-IR-submm spectral energy distribution of two distant (z = 3.8) radio galaxies, 4C 41.17 and TN J2007-1316. These two radio galaxies were selected from the HeRGÉ (Herschel Radio Galaxies Evolution) Project in particular for their faint active ga…
XMM-Newton and Swift spectroscopy of the newly discovered very faint X-ray transient IGR J17494-3030.
Degenaar, N.; Wijnands, R.; Armas Padilla, M.
A growing group of low-mass X-ray binaries are found to be accreting at very faint X-ray luminosities of <1036 erg s-1 (2-10 keV). One such system is the new X-ray transient IGR J17494-3030. We present Swift and XMM-Newton observations obtained during its 2012 discovery outburst. The Swift observations trace the peak of th…
Herschel-ATLAS: correlations between dust and gas in local submm-selected galaxies
Ivison, R. J.; de Zotti, G.; Cooray, A. +21 more
We present an analysis of CO molecular gas tracers in a sample of 500 µm-selected Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) galaxies at z < 0.05 (cz < 14990 km s-1). Using 22-500 µm photometry from Wide-Field Infrared Survey Explorer, Infrared Astronomical Satellite and Herschel, with H I data from t…
On the hadronic γ-ray emission from tycho's supernova remnant.
Zhang, X.; Chen, Y.; Li, H. +1 more
Hadronic γ-ray emission from supernova remnants (SNRs) is an important tool to test shock acceleration of cosmic-ray protons. Tycho is one of nearly a dozen Galactic SNRs which are suggested to emit hadronic γ-ray emission. Among them, however, it is the only one in which the hadronic emission is proposed to arise from the interaction with a low-d…
INTEGRAL observations of SS433: system's parameters and nutation of supercritical accretion disc
Sunyaev, R. A.; Postnov, K. A.; Cherepashchuk, A. M. +3 more
Based on multiyear INTEGRAL observations of SS433 in 2003-2011, a composite IBIS/ISGRI 18-60 keV orbital light curve is constructed around zero precessional phases ψpr = 0 at the maximum accretion disc opening angle. It shows a peculiar shape with significant excess near the orbital phase φorb = 0.25, which is not seen in the…
Star-planet-debris disc alignment in the HD 82943 system: is planetary system coplanarity actually the norm?
Bryden, G.; Wyatt, M. C.; Kennedy, G. M. +2 more
Recent results suggest that the two planets in the HD 82943 system are inclined to the sky plane by 20 ± 4°. Here, we show that the debris disc in this system is inclined by 27 ± 4°, thus adding strength to the derived planet inclinations and suggesting that the planets and debris disc are consistent with being aligned at a level similar to the So…
A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars
White, G. J.; Fossati, L.; Paunzen, E. +3 more
We have analysed the photometric data obtained with the STEREO spacecraft for 558 non-magnetic chemically peculiar (CP) stars to search for rotational and pulsational variability. Applying the Lomb-Scargle and the phase dispersion minimization methods, we have detected photometric variability for 44 objects from which 35 were previously unknown. T…