Search Publications
H I and CO in the circumstellar environment of the oxygen-rich AGB star RX Leporis
Winters, J. M.; Le Bertre, T.; Libert, Y. +1 more
Context: Circumstellar shells around AGB stars are built over long periods of time that may reach several million years. They may therefore be extended over large sizes ( 1 pc, possibly more), and different complementary tracers are needed to describe their global properties.
Aims: We set up a program to explore the properties of matter in the…
The efficient low-mass Seyfert MCG-05-23-016
Gehrels, N.; Petrucci, P. -O.; Shrader, C. R. +5 more
Aims: The Seyfert 1.9 galaxy MCG-05-23-016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high Eddington rate, and allows us to study a super massive black hole in an early stage.
Methods: Three observations of the INTEGRAL satellite simul…
Central K-band kinematics and line strength maps of NGC 1399
Kuntschner, H.; Silva, D. R.; Lyubenova, M.
In this paper we present for the first time high spatial resolution K-band maps of the central kinematical and near-infrared spectral properties of the giant cD galaxy in the Fornax cluster, NGC 1399. We confirm the presence of a central velocity dispersion dip within r ≤ 0.2 arcsec seen in previous long-slit studies. Our velocity dispersion maps …
Bulges of disk galaxies at intermediate redshifts. II. Nuclear, disk, and global colors in the Groth Strip
Balcells, Marc; Domínguez-Palmero, Lilian
Context: The chronology of bulge and disk formation is a major unsolved issue in galaxy formation, which impacts on our global understanding of the Hubble sequence.
Aims: We analyse colours of the nuclear regions of intermediate redshift disk galaxies, with the aim of obtaining empirical information of relative ages of bulges and disks at 0.1 …
Structures in surface-brightness profiles of LMC and SMC star clusters: evidence of mergers?
Bonatto, C.; Bica, E.; Carvalho, L. +2 more
Context: The LMC and SMC are rich in binary star clusters, and some mergers are expected. It is thus important to characterise single clusters, binary clusters and candidates for mergers.
Aims: We selected a sample of star clusters in each Cloud with this aim. Surface photometry of 25 SMC and 22 LMC star clusters was carried with the ESO Danis…
XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft X-ray excess problem
Bianchi, S.; Jiménez-Bailón, E.; Matt, G. +1 more
Context: The nature and origin of the soft X-ray excess in radio-quiet AGN is still an open issue. The interpretation in terms of thermal disc emission has been challanged by the discovery of the constancy of the effective temperature despite the wide range of Black Hole masses of the observed sources. Alternative models are reflection from ionize…
Diameter and photospheric structures of Canopus from ;AMBER/VLTI interferometry
Millour, F.; Domiciano de Souza, A.; Bendjoya, P. +2 more
Context: Direct measurements of fundamental parameters and photospheric structures of post-main-sequence intermediate-mass stars are required for a deeper understanding of their evolution.
Aims: Based on near-IR long-baseline interferometry we aim to resolve the stellar surface of the F0 supergiant star Canopus, and to precisely measure its an…
INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary
Chaty, S.; Zurita Heras, J. A.
Context: AX J1749.1-2733 is an unclassified transient X-ray source discovered during surveys by ASCA in 1993-1999. The transient behaviour and the short and bright flares of the source have led to the idea that it is part of the recently revealed subclass of supergiant fast X-ray transients.
Aims: A multi-wavelength study in NIR, optical, X-ra…
Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +4 more
Aims: We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo.
Methods: We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo usi…
XMM-Newton observations of the Small Magellanic Cloud: XMMU J004814.1-731003, a 25.55 s Be/X-ray binary pulsar
Pietsch, W.; Haberl, F.; Sasaki, M. +2 more
Aims: To investigate candidates for Be/X-ray binaries in the Small Magellanic Cloud (SMC), we observed a region around the emission nebula N19 with XMM-Newton in October 2006.
Methods: We analysed the EPIC data of the detected point sources to derive their spectral and temporal characteristics.
Results: We detected X-ray pulsations with a …