Search Publications
A robust morphological classification of high-redshift galaxies using support vector machines on seeing limited images. II. Quantifying morphological k-correction in the COSMOS field at 1 < z < 2: Ks band vs. I band
Rouan, D.; Sanders, D. B.; Salvato, M. +10 more
Context: Morphology is the most accessible tracer of galaxies physical structure, but its interpretation in the framework of galaxy evolution still remains problematic. Its quantification at high redshift requires deep high-angular resolution imaging, which is why space data (HST) are usually employed. At z > 1, the HST visible cameras however …
Transiting exoplanets from the CoRoT space mission. VII. The ``hot-Jupiter''-type planet CoRoT-5b
Mazeh, T.; Aigrain, S.; Alonso, R. +43 more
Aims: The CoRoT space mission continues to photometrically monitor about 12 000 stars in its field-of-view for a series of target fields to search for transiting extrasolar planets ever since 2007. Deep transit signals can be detected quickly in the “alarm-mode” in parallel to the ongoing target field monitoring. CoRoT's first planets have been de…
Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518
Guenther, E. W.; Pasquini, L.; Hatzes, A. P. +2 more
Context: 11 UMi and HD 32518 belong to a sample of 62 K giant stars that has been observed since February 2004 using the 2m Alfred Jensch telescope of the Thüringer Landessternwarte (TLS) to measure precise radial velocities (RVs).
Aims: The aim of this survey is to investigate the dependence of planet formation on the mass of the host star by…
Timing of the 2008 outburst of SAX J1808.4-3658 with XMM-Newton: a stable orbital-period derivative over ten years
Papitto, A.; Burderi, L.; D'Aì, A. +4 more
We report on a timing analysis performed on a 62-ks long XMM-Newton observation of the accreting millisecond pulsar SAX J1808.4-3658 during the latest X-ray outburst that started on September 21, 2008. By connecting the time of arrivals of the pulses observed during the XMM-Newton observation, we derived the best-fit orbital solution and a best-fi…
Radio and X-ray study of two multi-shell supernova remnants: Kes 79 and G352.7-0.1
Giacani, E.; Paron, S.; Smith, M. J. S. +3 more
Aims: We investigate two multi-shell galactic supernova remnants (SNRs), Kes 79, and G352.7-0.1, to understand the causes of this morphology.
Methods: The research was carried out based on new and reprocessed archival VLA observations and XMM-Newton archival data. The surrounding gas was investigated based on data extracted from the HI Canadia…
Absorption line indices in the UV. I. Empirical and theoretical stellar population models
Thomas, D.; Bender, R.; Maraston, C. +1 more
Aims: Stellar absorption lines in the optical (e.g. the Lick system) have been extensively studied and constitute an important stellar population diagnostic for galaxies in the local universe and up to moderate redshifts. Proceeding towards higher look-back times, galaxies are younger and the ultraviolet becomes the relevant spectral region where …
Faint recombination lines in Galactic PNe with a [WC] nucleus
García-Rojas, J.; Peña, M.; Peimbert, A.
Aims: We present spatially resolved high-resolution spectrophotometric data for the planetary nebulae PB 8, NGC 2867, and PB 6. We have analyzed two knots in NGC 2867 and PB 6 and one in PB 8. The three nebulae are ionized by [WC] type nuclei: early [WO] for PB 6 and NGC 2867 and [WC 5-6] in the case of PB 8. Our aim is to study the behavior of th…
Quasar induced galaxy formation: a new paradigm?
Elbaz, D.; Jahnke, K.; Pantin, E. +2 more
Aims: We discuss observational evidence that quasars play a key role in the formation of galaxies, starting from the detailed study of the quasar HE0450-2958 and extending the discussion to a series of converging evidence that radio jets may trigger galaxy formation.
Methods: We use mid infrared imaging with VISIR at the ESO-VLT to model the m…
Modelling shock drift acceleration of electrons at the reconnection outflow termination shock in solar flares. Observational constraints and parametric study
Mann, G.; Aurass, H.; Warmuth, A.
Context: The acceleration of electrons to nonthermal energies in solar flares is one of the main unsolved questions in solar physics. One possibility for producing these energetic electrons is acceleration at the reconnection outflow termination shock (TS).
Aims: By comparing theoretical results with observations of nonthermal electrons, we de…
The chemical composition of carbon stars. The R-type stars
Abia, C.; Cristallo, S.; Plez, B. +2 more
Aims. The aim of this work is to shed some light on the problem of the formation of carbon stars of R-type from a detailed study of their chemical composition.
Methods: We use high-resolution and high signal-to-noise optical spectra of 23 R-type stars (both early- and late-types) selected from the Hipparcos catalogue. The chemical analysis is …