Search Publications
Diffuse radio emission in MACS J0025.4-1222: the effect of a major merger on bulk separation of ICM components
Riseley, C. J.; Scaife, A. M. M.; Wise, M. W. +1 more
Context. Mergers of galaxy clusters are among the most energetic events in the Universe. These events have significant impact on the intra-cluster medium, depositing vast amounts of energy, often in the form of shocks, as well as heavily influencing the properties of the constituent galaxy population. Many clusters have been shown to host large-sc…
Triggered massive star formation associated with the bubble Hii region Sh2-39 (N5)
Gromadzki, M.; Borissova, J.; Kuhn, M. A. +3 more
Aims: We perform a multiwavelength analysis of the bubble Hii region Sh2-39 (N5) and its environs with the aim of studying the physical properties of Galactic IR bubbles and exploring their impact in triggering massive star formation.
Methods: To analyze the molecular gas, we used CO(3-2) and HCO+(4-3) line data obtained with …
An analysis of star formation with Herschel in the Hi-GAL Survey. II. The tips of the Galactic bar
Paladini, R.; Piacentini, F.; Moore, T. J. T. +20 more
Context. We present the physical and evolutionary properties of prestellar and protostellar clumps in the Herschel Infrared GALactic plane survey (Hi-GAL) in two large areas centered in the Galactic plane and covering the tips of the long Galactic bar at the intersection with the spiral arms. The areas fall in the longitude ranges 19° <ℓ < 3…
Evidence of chaotic modes in the analysis of four δ Scuti stars
García, R. A.; García Hernández, A.; Roca Cortés, T. +1 more
Context. Since CoRoT observations unveiled the very low amplitude modes that form a flat plateau in the power spectrum structure of δ Scuti stars, the nature of this phenomenon, including the possibility of spurious signals due to the light curve analysis, has been a matter of long-standing scientific debate.
Aims: We contribute to this debat…
The onset of energetic particle irradiation in Class 0 protostars
Le Bourlot, J.; Favre, C.; Ceccarelli, C. +11 more
Context. The early stages of low-mass star formation are likely to be subject to intense ionization by protostellar energetic MeV particles. As a result, the surrounding gas is enriched in molecular ions, such as HCO+ and N2H+. Nonetheless, this phenomenon remains poorly understood for Class 0 objects. Recently, ba…
Measurement of the X-ray proper motion in the south-east rim of RX J1713.7-3946
Acero, Fabio; Katsuda, Satoru; Ballet, Jean +1 more
We report on the first proper motion measurement in the supernova remnant RX J1713.7-3946 using the XMM-Newton X-ray telescope on a 13 yr time interval. This expansion measurement is carried out in the south-east region of the remnant, where two sharp filament structures are observed. For the outermost filament, the proper motion is 0.75+0.05…
Oxygen budget in low-mass protostars: the NGC 1333-IRAS4A R1 shock observed in [O I] at 63 µm with SOFIA-GREAT
Güsten, R.; Simon, R.; Karska, A. +5 more
In molecular outflows from forming low-mass protostars, most oxygen is expected to be locked up in water. However, Herschel observations have shown that typically an order of magnitude or more of the oxygen is still unaccounted for. To test if the oxygen is instead in atomic form, SOFIA-GREAT observed the R1 position of the bright molecular outflo…
The AB Doradus system revisited: The dynamical mass of AB Dor A/C
Ros, E.; Lestrade, J. -F.; Tognelli, E. +6 more
Context. The study of pre-main-sequence (PMS) stars with model-independent measurements of their masses is essential to check the validity of theoretical models of stellar evolution. The well-known PMS binary AB Dor A/C is an important benchmark for this task, since it displays intense and compact radio emission, which makes possible the applicati…
Data processing pipeline for Herschel HIFI
Shipman, R. F.; Sanchez, E.; Braine, J. +26 more
Context. The HIFI instrument on the Herschel Space Observatory performed over 9100 astronomical observations, almost 900 of which were calibration observations in the course of the nearly four-year Herschel mission. The data from each observation had to be converted from raw telemetry into calibrated products and were included in the Herschel Scie…
Intrinsic scatter of caustic masses and hydrostatic bias: An observational study
Andreon, S.; Moretti, A.; Wang, J. +1 more
All estimates of cluster mass have some intrinsic scatter and perhaps some bias with true mass even in the absence of measurement errors for example caused by cluster triaxiality and large scale structure. Knowledge of the bias and scatter values is fundamental for both cluster cosmology and astrophysics. In this paper we show that the intrinsic s…