Search Publications
Stellar feedback in M 83 as observed with MUSE. II. Analysis of the H II region population: Ionisation budget and pre-SN feedback
Della Bruna, Lorenza; Robert, Carmelle; Amram, Philippe +11 more
Context. Energy and momentum injected by young, massive stars into the surrounding gas play an important role in regulating further star formation and in determining the galaxy's global properties. Before supernovae begin to explode, stellar feedback consists of two main processes: radiation pressure and photoionisation.
Aims: We study pre-su…
Upper mass-loss limits and clumping in the intermediate and outer wind regions of OB stars
Puls, J.; Najarro, F.; Traficante, A. +4 more
Context. Mass loss is a key parameter throughout the evolution of massive stars, and it determines the feedback with the surrounding interstellar medium. The presence of inhomogeinities in stellar winds (clumping) leads to severe discrepancies not only among different mass-loss rate diagnostics, but also between empirical estimates and theoretical…
Quasars as high-redshift standard candles
Vignali, C.; Gilli, R.; Civano, F. +10 more
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used to derive quasar distances and to build a Hubble diagram at redshifts up to z ∼ 7. This cosmological application is based on the assumption of independence of the relation on redshift and luminosity. We want to test the reliability of this hypothesis…
Probabilistic classification of X-ray sources applied to Swift-XRT and XMM-Newton catalogs
Godet, Olivier; Tranin, Hugo; Webb, Natalie +1 more
Context. Serendipitous X-ray surveys have proven to be an efficient way to find rare objects, for example tidal disruption events, changing-look active galactic nuclei (AGN), binary quasars, ultraluminous X-ray sources, and intermediate mass black holes. With the advent of very large X-ray surveys, an automated classification of X-ray sources beco…
Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone. I. Identification and classification
Mašek, M.; Paunzen, E.; Skarka, M. +11 more
Context. In the time of large space surveys that provide tremendous amounts of precise data, it is highly desirable to have a commonly accepted methodology and system for the classification of variable stars. This is especially important for A-F stars, which can show intrinsic brightness variations due to both rotation and pulsations.
Aims: T…
The stellar content of the ROSAT all-sky survey
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
Aims: We present and apply a method to identify the stellar content of the ROSAT all-sky survey (RASS).
Methods: We performed a crossmatch between the RASS sources and stellar candidates selected from Gaia Early Data Release 3 (EDR3) and estimated stellar probabilities for every RASS source from the geometric properties of the match and …
The typical width of Herschel filaments
Arzoumanian, D.; Palmeirim, P.; André, P. J.
Context. Dense molecular filaments are widely believed to be representative of the initial conditions of star formation in interstellar clouds. Characterizing their physical properties, such as their transverse size, is therefore of paramount importance. Herschel studies suggest that nearby (d < 500 pc) molecular filaments have a typical half-p…
Gyrochronological dating of the stellar moving group Group X
Baratella, M.; Messina, S.; D'Orazi, V. +4 more
Context. Gyrochronology is one of the methods currently used to estimate the age of stellar open clusters. Hundreds of new clusters, associations, and moving groups unveiled by Gaia and complemented by accurate rotation period measurements provided by recent space missions such as Kepler and TESS are allowing us to significantly improve the reliab…
The eROSITA Final Equatorial-Depth Survey (eFEDS). A multiwavelength view of WISE mid-infrared galaxies/active galactic nuclei
Nandra, Kirpal; Imanishi, Masatoshi; Wada, Keiichi +21 more
Aims: We investigate the physical properties - such as the stellar mass (M*), star-formation rate, infrared (IR) luminosity (LIR), X-ray luminosity (LX), and hydrogen column density (NH) - of mid-IR (MIR) galaxies and active galactic nuclei (AGN) at z < 4 in the 140 deg2 field observed…
Detections of solar-like oscillations in dwarfs and subgiants with Kepler DR25 short-cadence data
García, R. A.; Mosser, B.; Mathur, S. +6 more
During the survey phase of the Kepler mission, several thousand stars were observed in short cadence, allowing for the detection of solar-like oscillations in more than 500 main-sequence and subgiant stars. These detections showed the power of asteroseismology in determining fundamental stellar parameters. However, the Kepler Science Office discov…