Search Publications
Origin of the ionized wind in MWC 349A
Martín-Pintado, J.; Planesas, P.; Thum, C. +2 more
The UC-HII region of MWC 349A is the prototype of an ionized wind driven by a massive star surrounded by a disk. Recent high angular resolution observations of the millimeter recombination lines have shown that the disk rotates with a Keplerian law in its outer parts. However, the kinematics of innermost regions in the UC-HII region of MWC 349A is…
Herschel/PACS spectroscopy of trace gases of the stratosphere of Titan
Lara, L. M.; Hartogh, P.; Lellouch, E. +7 more
Aims: We investigate the composition of Titan's stratosphere from new medium-resolution far-infrared observations performed with the full range of Herschel's Photodetector Array Camera and Spectrometer (PACS) (51-220 µm at a resolution λ/Δλ ranging from 950 to 5500 depending on wavelength and grating order).
Methods: Using PACS, we…
Strömgren and near-infrared photometry of metal-rich bulge globular clusters. I. NGC 6528 and its surrounding field
Milone, A. P.; Lagioia, E. P.; Zoccali, M. +9 more
We present Strömgren and near-infrared (NIR) photometry of the bulge cluster NGC 6528 and its surrounding field in Baade's Window. uvby images were collected with EFOSC2 on the New Technology Telescope (NTT, La Silla, ESO). The NIR catalogs are based on J,K-band VIRCAM at VISTA (Paranal, ESO) and SOFI at NTT photometry. We matched the aforemention…
X-ray emission from an FU Orionis star in early outburst: HBC 722
Skinner, Stephen L.; Güdel, Manuel; Green, Joel +1 more
Aims: We conducted the first X-ray observations of the newly erupting FU Ori-type outburst in HBC 722 (V2493 Cyg) with the aim to characterize its X-ray behavior and near-stellar environment during early outburst.
Methods: We used data from the XMM-Newton and Chandra X-ray observatories to measure X-ray source temperatures and luminositi…
Detection of galaxies with Gaia
Ducourant, C.; Krone-Martins, A.; Teixeira, R. +2 more
Aims: Besides its major objective tuned to detecting the stellar galactic population, the Gaia mission experiment will also observe a large number of galaxies. In this work we intend to evaluate the number and the characteristics of the galaxies that will effectively pass the on-board selection algorithm of Gaia.
Methods: The detection o…
Interpreting the extended emission around three nearby debris disc host stars
Eiroa, C.; Marshall, J. P.; Montesinos, B. +7 more
Context. Cool debris discs are a relic of the planetesimal formation process around their host star, analogous to the solar system's Edgeworth-Kuiper belt. As such, they can be used as a proxy to probe the origin and formation of planetary systems like our own.
Aims: The Herschel open time key programmes "DUst around NEarby Stars" (DUNES) and…
The important role of evolution in the Planck YSZ-mass calibration
Andreon, S.
In light of the tension between cosmological parameters from Planck cosmic microwave background and galaxy clusters, we revised the Planck analysis of the YSZ-mass calibration to allow evolution to be determined by the data instead of being imposed as an external constraint. Our analysis uses the very same data and Malmquist bias correc…
Atomic data for astrophysics: improved collision strengths for Fe viii
Del Zanna, G.; Badnell, N. R.
We describe, and present the results of, a new large-scale R-matrix scattering calculation for the electron collisional excitation of Fe viii. We first discuss the limitations of the previous calculations, in particular concerning some strong EUV lines observed in the solar corona by the Hinode EUV Imaging Spectrometer. We then present a new targe…
Relativistic reflection in the average X-ray spectrum of active galactic nuclei in the Véron-Cetty and Véron catalogue
Barcons, X.; Falocco, S.; Miniutti, G. +2 more
Context. The X-ray spectra of active galactic nuclei (AGN) unveil properties of matter around the super-massive black hole (SMBH).
Aims: We investigate the X-ray spectra of AGN focusing on Compton reflection and fluorescence. These are two of the most important processes of interaction between primary radiation and circumnuclear material that…
On the Fe abundance peak formation in cool-core clusters of galaxies: hints from cluster WARPJ1415.1+3612 at z = 1.03
Nonino, Mario; Rosati, Piero; Tozzi, Paolo +5 more
We present a detailed study of the iron content of the core of the high-redshift cluster WARPJ1415.1+3612 (z = 1.03). By comparing the central Fe mass excess observed in this system, MFeexc = (1.67 ± 0.40) × 109 M⊙, with those measured in local cool-core systems, we infer that the bulk of the mass excess…