Search Publications
Cool core remnants in galaxy clusters
Rossetti, M.; Molendi, S.
Context. X ray clusters are conventionally divided into two classes: “cool core” (CC) and “non-cool core” (NCC) objects, on the basis of the observational properties of their central regions. Recent results have shown that the cluster population is bimodal.
Aims: We want to understand whether the observed distribution of clusters is due to a …
Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources
Palazzi, E.; Minniti, D.; Masetti, N. +17 more
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to 30%) of unidentified objects among the detected sources. Here we continue our program of identification of these objects by (i) selecting probable optical candidates by means of positional cross-correlation of the INTEGRAL detections with soft X-ra…
Neptune's atmospheric composition from AKARI infrared spectroscopy
Fletcher, L. N.; Encrenaz, T.; Burgdorf, M. +2 more
Aims: Disk-averaged infrared spectra of Neptune between 1.8 and 13 µm, obtained by the AKARI infrared camera (IRC) in May 2007, have been analysed to (a) determine the globally-averaged stratospheric temperature structure; (b) derive the abundances of stratospheric hydrocarbons; and (c) detect fluorescent emission from CO at 4.7 µ…
Star formation triggered by H II regions in our Galaxy. First results for N49 from the Herschel infrared survey of the Galactic plane
Testi, L.; Zavagno, A.; Ward-Thompson, D. +18 more
Context. It has been shown that by means of different physical mechanisms the expansion of H ii regions can trigger the formation of new stars of all masses. This process may be important to the formation of massive stars but has never been quantified in the Galaxy.
Aims: We use Herschel-PACS and -SPIRE images from the Herschel infrared surve…
A scenario of planet erosion by coronal radiation
Eiroa, C.; Ribas, I.; Solano, E. +4 more
Context. According to theory, high-energy emission from the coronae of cool stars can severely erode the atmospheres of orbiting planets. No observational tests of the long-term erosion effects have been made yet.
Aims: We analyze the current distribution of planetary mass with X-ray irradiation of the atmospheres to make an observational ass…
The 3-D structure of SN 1987A's inner ejecta
Spyromilio, J.; Fransson, C.; Jerkstrand, A. +2 more
Context. Observing the inner ejecta of a supernova is possible only in a handful of nearby supernova remnants. The core-collapse explosion mechanism has been extensively explored in recent models and predict large asymmetries. SN 1987A is the first modern stellar explosion that has been continuously observed from its beginning to the supernova rem…
Distance determination for RAVE stars using stellar models
Gilmore, G.; Freeman, K. C.; Munari, U. +21 more
Aims: We develop a method for deriving distances from spectroscopic data and obtaining full 6D phase-space coordinates for the RAVE survey's second data release.
Methods: We used stellar models combined with atmospheric properties from RAVE (effective temperature, surface gravity and metallicity) and (J-Ks) photometry from arc…
Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244
Henning, T.; Krause, O.; André, P. +6 more
We present Herschel observations of the isolated, low-mass star-forming Bok globule CB244. It contains two cold sources, a low-mass Class 0 protostar and a starless core, which is likely to be prestellar in nature, separated by 90" (~18 000 AU). The Herschel data sample the peak of the Planck spectrum for these sources, and are therefore ideal for…
A study of the interplay between ionized gas and star clusters in the central region of NGC 5253 with 2D spectroscopy
Walsh, J. R.; Monreal-Ibero, A.; Vílchez, J. M. +1 more
Context. Starbursts are one of the main contributors to the chemical enrichment of the interstellar medium. However, mechanisms governing the interaction between the recent star formation and the surrounding gas are not fully understood. Because of their a priori simplicity, the subgroup of H II galaxies constitute an ideal sample to study these m…
Radioactive 26Al from the Scorpius-Centaurus association
Wang, W.; Diehl, R.; Jean, P. +7 more
Context. The Scorpius-Centaurus association is the most-nearby group of massive and young stars. As nuclear-fusion products are ejected by massive stars and supernovae into the surrounding interstellar medium, the search for characteristic γ-rays from radioactivity is one way to probe the history of activity of such nearby massive stars on a My ti…