Search Publications
Stellar classification of CoRoT targets
Deeg, H.; Deleuil, M.; Moutou, C. +4 more
Context. The CoRoT mission was the first dedicated to the search for exoplanets from space. The CoRoT exoplanet channel observed about 163 600 targets to detect transiting planetary companions. In addition to the search for exoplanets, the extremely precise photometric time series provided by CoRoT for this vast number of stars is an invaluable re…
Constraining the escape fraction of ionizing photons from H II regions within NGC 300: A concept paper
Bastian, N.; Niederhofer, F.; Hilker, M. +1 more
Using broadband photometry from the Hubble Space Telescope in combination with Very Large Telescope narrowband Hα observations of the nearby spiral galaxy NGC 300, we explore a method for estimating the escape fractions of hydrogen-ionizing photons from H II regions within this galaxy. Our goal in this concept study is to evaluate the spectral typ…
Optimal cosmic microwave background map-making in the presence of cross-correlated noise
de Bernardis, P.; Vittorio, N.; Cabella, P. +2 more
Aims: We present an extension of the ROMA map-making algorithm for the generation of optimal cosmic microwave background polarization maps. The new code allows for a possible cross-correlated noise component among the detectors of a CMB experiment. A promising application is the forthcoming LSPE balloon-borne experiment, which is devoted to t…
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:…