Search Publications
High speed magnetized flows in the quiet Sun
Ruiz Cobo, B.; Borrero, J. M.; Quintero Noda, C. +1 more
Context. We analyzed spectropolarimetric data recorded with Hinode/SP in quiet-Sun regions located at the disk center. We found single-lobed Stokes V profiles showing highly blue- and red-shifted signals. Oftentimes both types of events appear to be related to each other.
Aims: We aim to set constraints on the nature and physical causes of th…
VLT observations of the asymmetric Etched Hourglass Nebula, MyCn 18
Redman, M. P.; Matsuura, M.; Meaburn, J. +3 more
Context. The mechanisms that form extreme bipolar planetary nebulae remain unclear.
Aims: The physical properties, structure, and dynamics of the bipolar planetary nebula, MyCn 18, are investigated in detail with the aim of understanding the shaping mechanism and evolutionary history of this object.
Methods: VLT infrared images, VLT ISAA…
Population of the Galactic X-ray binaries and eRosita
Santangelo, A.; Ducci, L.; Sasaki, M. +1 more
The population of the Galactic X-ray binaries has been mostly probed with moderately sensitive hard X-ray surveys so far. The eRosita mission will provide for the first time a sensitive all-sky X-ray survey in the 2-10 keV energy range, where the X-ray binaries emit most of the flux and discover the still unobserved low-luminosity population of th…
Searching for visual companions of close Cepheids. VLT/NACO lucky imaging of Y Oph, FF Aql, X Sgr, W Sgr, and η Aql
Kervella, P.; Mérand, A.; Girard, J. H. V. +4 more
Aims: High-resolution imaging in several photometric bands can provide color and astrometric information of the wide-orbit component of Cepheid stars. Such measurements are needed to understand the age and evolution of pulsating stars. In addition, binary Cepheids have the potential to provide direct and model-independent distances and masses…
Unveiling the environment surrounding low-mass X-ray binary SAX J1808.4-3658
Kaastra, J. S.; Costantini, E.; Fabian, A. C. +2 more
Context. Low-mass X-ray binaries (LMXBs) are a natural workbench to study accretion disk phenomena and optimal background sources to measure elemental abundances in the interstellar medium (ISM). In high-resolution XMM-Newton spectra, the LMXB SAX J1808.4-3658 in the past showed a neon column density significantly higher than expected given its sm…
Mass profile and dynamical status of the z ~ 0.8 galaxy cluster LCDCS 0504
Ilbert, O.; Schrabback, T.; Schirmer, M. +34 more
Context. Constraints on the mass distribution in high-redshift clusters of galaxies are currently not very strong.
Aims: We aim to constrain the mass profile, M(r), and dynamical status of the z ~ 0.8 LCDCS 0504 cluster of galaxies that is characterized by prominent giant gravitational arcs near its center.
Methods: Our analysis is based…
Characterizing AGB stars in Wide-field Infrared Survey Explorer (WISE) bands
Kong, Xu; Zhu, Qingfeng; He, Jinhua +1 more
Aims: Since asymptotic giant branch (AGB) stars are bright and extended infrared objects, most Galactic AGB stars saturate the Wide-field Infrared Survey Explorer (WISE) detectors and therefore the WISE magnitudes that are restored by applying point-spread-function fitting need to be verified. Statistical properties of circumstellar envelopes…
Dust composition and mass-loss return from the luminous blue variable R71 in the LMC
Waters, L. B. F. M.; Tielens, A. G. G. M.; Meixner, M. +3 more
Context. We present an analysis of mid- and far-infrared (IR) spectrum and spectral energy distribution (SED) of the luminous blue variable (LBV) R71 in the Large Magellanic Cloud (LMC).
Aims: This work aims to understand the overall contribution of high-mass LBVs to the total dust-mass budget of the interstellar medium (ISM) of the LMC and c…
High-resolution ammonia mapping of the very young protostellar core Chamaeleon-MMS1
Walmsley, C. M.; Harju, J.; Miettinen, O. +4 more
Aims: The aim of this study is to investigate the structure and kinematics of the nearby candidate first hydrostatic core Cha-MMS1.
Methods: Cha-MMS1 was mapped in the NH3(1,1) line and the 1.2 cm continuum using the Australia Telescope Compact Array (ATCA). The angular resolution of the ATCA observations is 7″ (~1000 AU), and…
Extended warm gas in the ULIRG Mrk273: Galactic outflows and tidal debris
Veilleux, S.; Rupke, D. S. N.; Sparks, W. B. +6 more
We present new HST/ACS medium- and narrow-band images and optical Isaac Newton Telescope long-slit spectra of the merging system Mrk273. The HST observations sample the [OIII]λλ4959,5007 emission from the galaxy and the nearby continuum. These data were taken as a part of a larger study of ultraluminous infrared galaxies (ULIRGs) with the aim of i…