Search Publications
Molecular gas and star formation toward the IR dust bubble S 24 and its environs
Rubio, M.; Firpo, V.; Cappa, C. E. +4 more
Aims: We present a multiwavelength analysis of the infrared dust bubble S 24 and the extended IR sources G341.220-0.213 and G341.217-0.237 located in its environs. We aim to investigate the characteristics of the molecular gas and the interstellar dust linked to them and analyze the evolutionary state of the young stellar objects identified t…
XMM-Newton reveals a Seyfert-like X-ray spectrum in the z = 3.6 QSO B1422+231
Cappi, M.; Ponti, G.; Vignali, C. +5 more
Context. Matter flows from the central regions of quasi-stellar objects (QSOs) during their active phases are probably responsible for the properties of the super-massive black holes and those of the bulges of host galaxies. To understand how this mechanism works, we need to characterize the geometry and the physical state of the accreting matter …
RT Crucis: a look into the X-ray emission of a peculiar symbiotic star
Santangelo, A.; Ducci, L.; Ferrigno, C. +3 more
Symbiotic stars are a heterogeneous class of interacting binaries. Among them, RT Cru has been classified as prototype of a subclass that is characterised by hard X-ray spectra that extend past ~20 keV. We analyse ~8.6 Ms of archival INTEGRAL data collected during the period 2003-2014, ~ 140 ks of Swift/XRT data, and a Suzaku observation of 39 ks,…
A submillimetre search for pre- and proto-brown dwarfs in Chamaeleon II
de Gregorio-Monsalvo, I.; Eiroa, C.; Bayo, A. +7 more
Context. The Chamaeleon II molecular cloud is an active star-forming region that offers an excellent opportunity to study the formation of brown dwarfs in the southern hemisphere.
Aims: Our aims are to identify a population of pre- and proto-brown dwarfs (5σ mass limit threshold of ~0.015 M⊙) and provide information on the formatio…
Photometry of dust grains of comet 67P and connection with nucleus regions
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Aims: Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks.
Methods: We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photom…
Exploring the crowded central region of ten Galactic globular clusters using EMCCDs. Variable star searches and new discoveries
Surdej, J.; Snodgrass, C.; Horne, K. +30 more
Aims: We aim to obtain time-series photometry of the very crowded central regions of Galactic globular clusters; to obtain better angular resolution thanhas been previously achieved with conventional CCDs on ground-based telescopes; and to complete, or improve, the census of the variable star population in those stellar systems.
Methods:…
Hot gas and magnetic arms of NGC 6946: Indications for reconnection heating?
Ehle, M.; Weżgowiec, M.; Beck, R.
Context. The grand-design face-on spiral galaxy
Aims:…
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…