Search Publications
Probing the Dragonfish star-forming complex: the ionizing population of the young massive cluster Mercer 30
Herrero, A.; Urbaneja, M. A.; Najarro, F. +11 more
It has recently been claimed that the nebula, Dragonfish, is powered by a superluminous but elusive OB association. However, systematic searches in near-infrared photometric surveys have found many other cluster candidates in this region of the sky. Among these, the first confirmed young massive cluster was Mercer 30, where Wolf-Rayet stars were f…
Determining the fraction of reddened quasars in COSMOS with multiple selection techniques from X-ray to radio wavelengths
Geier, S.; Milvang-Jensen, B.; Vestergaard, M. +8 more
The sub-population of quasars reddened by intrinsic or intervening clouds of dust are known to be underrepresented in optical quasar surveys. By defining a complete parent sample of the brightest and spatially unresolved quasars in the COSMOS field, we quantify to which extent this sub-population is fundamental to our understanding of the true pop…
SELFI: an object-based, Bayesian method for faint emission line source detection in MUSE deep field data cubes
Bacon, Roland; Meillier, Céline; Chatelain, Florent +4 more
We present SELFI, the Source Emission Line FInder, a new Bayesian method optimized for detection of faint galaxies in Multi Unit Spectroscopic Explorer (MUSE) deep fields. MUSE is the new panoramic integral field spectrograph at the Very Large Telescope (VLT) that has unique capabilities for spectroscopic investigation of the deep sky. It has prov…
A new sample of X-ray selected narrow emission-line galaxies. II. Looking for True Seyfert 2
Watson, M. G.; Pons, E.
A sample of X-ray and optically selected narrow emission-line galaxies (769 sources) from the 3XMM catalogue cross-correlated with SDSS (DR9) catalogue has been studied. Narrow-emission line active galactic nuclei (AGN; type-2) have been selected on the basis of their emission line ratios and/or X-ray luminosity. We have looked for X-ray unobscure…
Unveiling the radio counterparts of two binary AGN candidates: J1108+0659 and J1131-0204
Bondi, M.; Piconcelli, E.; Pérez-Torres, M. A. +1 more
The sources SDSS J113126.08-020459.2 and SDSS J110851.04+065901.4 are two double-peaked [O III] emitting active galactic nuclei (AGNs), identified as candidate binary AGNs by optical and near infrared (NIR) observations. We observed the two sources with high resolution Very Long Baseline Interferometry (VLBI) using the European VLBI Network at 5 G…
A database of synthetic photometry in the GALEX ultraviolet bands for the stellar sources observed with the International Ultraviolet Explorer
Beitia-Antero, Leire; Gómez de Castro, Ana I.
Context. The Galaxy Evolution Explorer (GALEX) has produced the largest photometric catalogue of ultraviolet (UV) sources. As such, it has defined the new standard bands for UV photometry: the near UV band (NUV) and the far UV band (FUV). However, due to brightness limits, the GALEX mission has avoided the Galactic plane which is crucial for astro…
Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope
Strassmeier, K. G.; Schmidt, W.; Solanki, S. K. +23 more
A small flare ribbon above a sunspot umbra in active region 12205 was observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5 m GREGOR telescope, using a 1 Å Ca II H interference filter. Context observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO), the Solar Optical Telescop…
Analysis of the WN star WR 102c, its WR nebula, and the associated cluster of massive stars in the Sickle Nebula
Sander, A.; Hamann, W. -R.; Oskinova, L. M. +3 more
Context. The massive Wolf-Rayet type star WR 102c is located near the
Three-dimensional distribution of hydrogen fluoride gas toward NGC 6334 I and I(N)
Abergel, A.; van der Wiel, M. H. D.; Naylor, D. A. +2 more
Context. The HF molecule has been proposed as a sensitive tracer of diffuse interstellar gas, while at higher densities its abundance could be influenced heavily by freeze-out onto dust grains.
Aims: We investigate the spatial distribution of a collection of absorbing gas clouds, some associated with the dense, massive star-forming core NGC 6…
Learning about stars from their colors
Allende Prieto, C.
Aims: We pose the question of how much information on the atmospheric parameters of late-type stars can be retrieved purely from color information using standard photometric systems.
Methods: We carried out numerical experiments using stellar fluxes from model atmospheres, injecting random noise before analyzing them. We examined the pre…