Search Publications
The ionization fraction in OMC-2 and OMC-3
Menten, K. M.; Tielens, A. G. G. M.; Wyrowski, F. +4 more
Context. The electron density (ne−) plays an important role in setting the chemistry and physics of the interstellar medium. However, measurements of ne− in neutral clouds have been directly obtained only toward a few lines of sight or they rely on indirect determinations.
Aims: We use carbon radio …
Stereoscopic measurements of coronal Doppler velocities
Barczynski, K.; Mierla, M.; Berghmans, D. +8 more
Context. The Solar Orbiter mission, with an orbit outside the Sun-Earth line and leaving the ecliptic plane, opens up opportunities for the combined analysis of measurements obtained by solar imagers and spectrometers. For the first time different space spectrometers will be located at wide angles to each other, allowing three-dimensional (3D) spe…
An XMM-Newton catalogue of BL Lacs
Racero, E.; Álvarez Crespo, N.; de la Calle Pérez, I. +1 more
Aims: We present an XMM-Newton catalogue of BL Lac X-ray, optical, and UV properties based on cross-correlation with the 1151 BL Lacs listed in the fifth edition of the Roma-BZCAT.
Methods: We searched for the X-ray counterparts to these objects in the field of view of all pointed observations in the XMM-Newton archive over nearly 20 yea…
Goodness-of-fit test for isochrone fitting in the Gaia era. Statistical assessment of the error distribution
Valle, G.; Dell'Omodarme, M.; Tognelli, E.
Context. The increasing precision in observational data made available by recent surveys means that the reliability of stellar models can be tested. For this purpose, a firm theoretical basis is crucial for evaluating the agreement of the data and theoretical predictions. Aims This paper presents a rigorous derivation of a goodness-of-fit statisti…
Bright single-mode RR Lyrae stars: Matching Gaia EDR3 with pulsation and evolutionary models
Kovacs, Geza; Karamiqucham, Behrooz
We combine observed metallicity, optical, and infrared magnitudes with evolutionary and pulsation models to derive average luminosities for 156 single-mode RR Lyrae stars. These luminosities are compared with those obtained from the Gaia EDR3 parallaxes and are found to be in excellent agreement with the high accuracy subsample (62 stars, with rel…
Elimination of a virtual impactor of 2006 QV89 via deep non-detection
Faggioli, L.; Micheli, M.; Hainaut, O. R. +3 more
Context. As a consequence of the large (and growing) number of near-Earth objects discovered, some are lost before their orbits can be firmly established and long-term recovery ensured. A fraction of these objects present non-negligible chances of impact with the Earth. We present a method of targeted observations that allow us to eliminate that r…
Warm ISM in the Sgr A complex. II. The [C/N] abundance ratio traced by [CII] 158 µm and [NII] 205 µm observations toward the Arched Filaments at the Galactic center
Abel, N.; Stutzki, J.; Simon, R. +2 more
Context. The Arches Cluster - Arched Filaments (AF) system is our Galaxy's prime example of the complexity involved in the interaction between the strong radiation field of numerous OB stars and their surrounding ISM in extremely harsh environments such as the Galactic center (GC) of the Milky Way. It offers a unique opportunity to study the close…
Extreme adaptive optics astrometry of R136. Searching for high proper motion stars
Vakili, F.; Boccaletti, A.; Langlois, M. +9 more
We compared high-contrast near-infrared images of the core of R136 taken by VLT/SPHERE, in two epochs separated by 3.06 years. For the first time we monitored the dynamics of the detected sources in the core of R136 from a ground-based telescope with adaptive optics. The aim of these observations was to search for High prOper Motion cAndidates (HO…
Clustering of red and blue galaxies around high-redshift 3C radio sources as seen by the Hubble Space Telescope
Chiaberge, Marco; West, Michael J.; Haas, Martin +5 more
To properly understand the evolution of high-redshift galaxy clusters, both passive and star-forming galaxies have to be considered. Here we study the clustering environment of 21 radio galaxies and quasars at 1 < z < 2.5 from the third Cambridge catalog (3C). We use optical and near-infrared Hubble Space Telescope images with a 2' field-of-…
[CII] emission properties of the massive star-forming region RCW 36 in a filamentary molecular cloud
Oyabu, S.; Nakagawa, T.; Ojha, D. K. +10 more
Aims: We investigate the properties of [C II] 158 µm emission of RCW 36 in a dense filamentary cloud.
Methods: [C II] observations of RCW 36, covering an area of ~30' × 30', were carried out with a Fabry-Pérot spectrometer on board a 100-cm balloon-borne far-infrared (IR) telescope with an angular resolution of 90''. Using AKARI an…