Search Publications
Low-mass X-ray binaries in the bulge of the Milky Way
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +4 more
We study the population of low-mass X-ray binaries (LMXBs) in the Galactic bulge using the deep survey of this region by the IBIS telescope aboard the INTEGRAL observatory. Thanks to the increased sensitivity with respect to previous surveys of this field, we succeeded in probing the luminosity function (LF) of LMXBs down to ~7×1034 erg…
Quantitative spectroscopy of Deneb
Przybilla, N.; Schiller, F.
Context: Quantitative spectroscopy of luminous BA-type supergiants offers a high potential for modern astrophysics. Detailed studies allow the evolution of massive stars, galactochemical evolution, and the cosmic distance scale to be constrained observationally.
Aims: A detailed and comprehensive understanding of the atmospheres of BA-type sup…
Magnetic field emergence in quiet Sun granules
Bellot Rubio, L. R.; Tsuneta, S.; del Toro Iniesta, J. C. +1 more
Aims:We describe a new form of small-scale magnetic flux emergence in the quiet Sun. This process seems to take vertical magnetic fields from subsurface layers to the photosphere, where they appear above granular convection cells.
Methods: High-cadence time series of spectropolarimetric measurements obtained by Hinode in a quiet region near di…
IMAGES IV: strong evolution of the oxygen abundance in gaseous phases of intermediate mass galaxies from z ~ 0.8
Cesarsky, C.; Östlin, G.; Yang, Y. +22 more
Context: Intermediate mass galaxies (> 1010 M_⊙) at z ~ 0.6 are the likeliest progenitors of the present-day, numerous population of spirals. There is growing evidence that they have evolved rapidly in the last 6 to 8 Gyr, and likely already have formed a significant fraction of their stellar mass, often showing perturbed morphologie…
The qWR star HD 45166. II. Fundamental stellar parameters and evidence of a latitude-dependent wind
Oliveira, A. S.; Steiner, J. E.; Groh, J. H.
Context: The enigmatic object HD 45166 is a qWR star in a binary system with an orbital period of 1.596 day, and presents a rich emission-line spectrum in addition to absorption lines from the companion star (B7 V). As the system inclination is very small (i=0.77° ± 0.09°), HD 45166 is an ideal laboratory for wind-structure studies.
Aims: The …
The mass distribution of RX J1347-1145 from strong lensing
Schrabback, T.; Bradač, M.; Lombardi, M. +5 more
Aims:We determine the central mass distribution of galaxy cluster RX J1347-1145 using strong gravitational lensing.
Methods: High-resolution HST/ACS images of the galaxy cluster RX J1347-1145 have enabled us to identify several new multiple-image candidates in the cluster, including a 5-image system with a central image. The multiple-images al…
Two new intermediate polars with a soft X-ray component
Mukai, K.; Gänsicke, B. T.; de Martino, D. +4 more
Aims: We analyze the first X-ray observations with XMM-Newton of 1RXS J070407.9+262501 and 1RXS 180340.0+401214, in order to characterize their broad-band temporal and spectral properties, also in the UV/optical domain, and to confirm them as intermediate polars.
Methods: For both objects, we performed a timing analysis of the X-ray and UV/opt…
Transiting exoplanets from the CoRoT space mission. V. CoRoT-Exo-4b: stellar and planetary parameters
Mazeh, T.; Aigrain, S.; Alonso, R. +42 more
Aims: The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star.
M…
Searching for mid-IR obscured AGN in the Chandra deep field North
Georgakakis, A.; Georgantopoulos, I.; Rovilos, E. +1 more
The efficiency of mid-infrared selection methods for finding obscured AGN is investigated using data in the Chandra Deep Field North. It is shown that samples of AGN candidates compiled on the basis of mid-infrared colours only suffer substantial contamination from normal galaxies. X-ray stacking analysis reveals a soft mean X-ray spectrum for the…
Star formation histories of early-type galaxies at z = 1.2 in cluster and field environments
Demarco, R.; Rosati, P.; Nonino, M. +3 more
We derive the star formation histories of early-type galaxies at z≃1.2 in both low and high density environments. To this purpose, we compare the co-added spectroscopic and 8-9 band photometric data of 43 mass selected early-type galaxies in the massive cluster RDCS J1252.9-2927 and the GOODS/CDF-S field with a large grid of composite stellar popu…