Search Publications
Young open clusters in the Galactic star forming region NGC 6357
Marconi, G.; Giannetti, A.; Beltrán, M. T. +3 more
Context. NGC 6357 is an active star forming region with very young massive open clusters. These clusters contain some of the most massive stars in the Galaxy and strongly interact with nearby giant molecular clouds.
Aims: We study the young stellar populations of the region and of the open cluster Pismis 24, focusing on their relationship wit…
Comparison of Sunyaev-Zel'dovich measurements from Planck and from the Arcminute Microkelvin Imager for 99 galaxy clusters
Böhringer, H.; Kneissl, R.; Dahle, H. +39 more
We present observations and analysis of a sample of 123 galaxy clusters from the 2013 Planck catalogue of Sunyaev-Zel'dovich sources with the Arcminute Microkelvin Imager (AMI), a ground-based radio interferometer. AMI provides an independent measurement with higher angular resolution, 3 arcmin compared to the Planck beams of 5-10 arcmin. The AMI …
Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations
Surdej, J.; Arellano Ferro, A.; Snodgrass, C. +32 more
Aims: In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal-rich ([Fe/H] > -1) globular clusters: NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652. The data have been used to perform a census of the variable stars in the central parts of these clusters.
Methods: The observations were m…
New XMM-Newton observation of the Phoenix cluster: properties of the cool core
Altieri, B.; Valtchanov, I.; Menanteau, F. +9 more
Aims: We present a spectral analysis of a deep (220 ks) XMM-Newton observation of the Phoenix cluster (SPT-CL J2344-4243). We also use Chandra archival ACIS-I data that are useful for modeling the properties of the central bright active galactic nucleus and global intracluster medium.
Methods: We extracted CCD and reflection grating spec…
The Good, the Bad, and the Ugly: Statistical quality assessment of SZ detections
Aghanim, N.; Arnaud, M.; Douspis, M. +6 more
We examine three approaches to the problem of source classification in catalogues. Our goal is to determine the confidence with which the elements in these catalogues can be distinguished in populations on the basis of their spectral energy distribution (SED). Our analysis is based on the projection of the measurements onto a comprehensive SED mod…
Smoke in the Pipe Nebula: dust emission and grain growth in the starless core FeSt 1-457
Alves, João; Forbrich, Jan; Lada, Charles J. +2 more
Context. The availability of submillimeter dust emission data in an unprecedented number of bands provides us with new opportunities to investigate the properties of interstellar dust in nearby clouds.
Aims: The nearby Pipe Nebula is an ideal laboratory to study starless cores. We here aim to characterize the dust properties of the FeSt 1-457…
XMMFITCAT: The XMM-Newton spectral-fit database
Georgantopoulos, I.; Watson, M. G.; Webb, N. A. +3 more
The XMM-Newton spectral-fit database (XMMFITCAT) is a catalogue of spectral fitting results for the source detections within the XMM-Newton serendipitous source catalogue with more than 50 net (background-subtracted) counts per detector in the 0.5-10 keV energy band. Its most recent version, constructed from the latest version of the XMM-Newton ca…
The star formation rate cookbook at 1 < z < 3: Extinction-corrected relations for UV and [OII]λ3727 luminosities
Cimatti, A.; Daddi, E.; Pozzi, F. +7 more
Aims: In this paper we use a well-controlled spectroscopic sample of galaxies at 1 <z< 3 drawn from the Galaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS) to study different star formation rate (SFR) estimators. In particular, we use infrared (IR) data to derive empirical calibrations to correct ultraviolet (UV) and [OII]λ3727…
Stellar laboratories. V. The Xe vi ultraviolet spectrum and the xenon abundance in the hot DO-type white dwarf RE 0503-289
Hoyer, D.; Rauch, T.; Quinet, P. +2 more
Context. For the spectral analysis of spectra of hot stars with a high resolution and high signal-to-noise ratio (S/N), advanced non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that are used for their calculation.
Aims: Reliable Xe vi oscillator str…
Quasi-periodic oscillations in accreting magnetic white dwarfs. I. Observational constraints in X-ray and optical
Bonnet-Bidaud, J. M.; Mouchet, M.; Busschaert, C. +2 more
Quasi-periodic oscillations (QPOs) are observed in the optical flux of some polars with typical periods of 1 to 3 s but none have been observed yet in X-rays where a significant part of the accreting energy is released. QPOs are expected and predicted from shock oscillations. Most of the polars have been observed by the XMM-Newton satellite. We ma…