Search Publications
Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods. II. Population inference
Paltani, Stéphane; Salvato, Mara; Eckert, Dominique +1 more
We present a new Bayesian method for reconstructing the parent distributions of X-ray spectral parameters of active galactic nuclei (AGN) in large surveys. The method uses the probability distribution function (PDF) of posteriors obtained by fitting a consistent physical model to each object with a Bayesian method. The PDFs are often broadly distr…
What is the origin of the stacked radio emission in radio-undetected quasars?. Insights from a radio-infrared image stacking analysis
Retana-Montenegro, E.
Radio emission in the brightest radio quasars can be attributed to processes inherent to active galactic nuclei (AGN) powered by super massive black holes (SMBHs), while the physical origins of the radio fluxes in quasars without radio detections have not been established with full certainly. Deep radio surveys carried out with the Low Frequency A…
The dynamical state of RXCJ1230.7+3439: A multi-substructured merging galaxy cluster
Böhringer, H.; Chon, G.; Barrena, R.
We analyse the kinematical and dynamical state of the galaxy cluster RXCJ1230.7+3439 (RXCJ1230), at z = 0.332 using 93 new spectroscopic redshifts of galaxies acquired at the Telescopio Nazionale Galileo and from SDSS DR16 public data. We study the density galaxy distribution retrieved from photometric SDSS multiband data and find that RXCJ1230 ap…
The nature of the X-ray sources constituting the 6.7 keV Galactic ridge emission
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
We reanalyze the deep Chandra X-ray observations near the Galactic center and show that reliable identifications of X-ray sources can be obtained with the Gaia EDR3 data to investigate which types of stellar sources are responsible for the X-ray emission observed from the Galactic ridge (GRXE). In the central 3 arcmin region 318 X-ray sources are …
Cyanopolyyne line survey towards high-mass star-forming regions with TMRT
Wang, Y. X.; Zhang, J. S.; Yan, Y. T. +8 more
Context. Cyanopolyynes (HC2n+1 N, n = 1,2,3), which are the linear carbon chain molecules, are precursors for the prebiotic synthesis of simple amino acids. They are important for understanding prebiotic chemistry and may be good tracers of the star formation sequence.
Aims: We aim to search for cyanopolyynes in high-mass star-form…
Double peak quasi-periodic pulsations in a circular-ribbon flare
Altyntsev, A. T.; Meshalkina, N. S.; Sych, R. A. +1 more
We study quasi-periodic pulsations (QPPs) during the impulsive phase of the C8.3 flare SOL2002-08-06T01:43. The shape of an extended 5.7 GHz source is similar to a tadpole with the head located above the region of a negative magnetic polarity, surrounded by positive polarity patches and with a remote tail source. The flare configuration includes b…
Ammonia characterisation of dense cores in the Rosette Molecular Cloud
Schneider, N.; Csengeri, T.; Motte, F. +5 more
Context. The Rosette molecular cloud complex is a well-known Galactic star-forming region with a morphology pointing towards triggered star formation. The distribution of its young stellar population and the gas properties point to the possibility that star formation is globally triggered in the region.
Aims: We focus on the characterisation …
Volume-limited sample of low-mass red giant stars, the progenitors of hot subdwarf stars. l. Sample selection and binary classification method
Uzundag, Murat; Jones, Matías I.; Bobrick, Alexey +3 more
Context. Current theory predicts that hot subdwarf binaries are produced from evolved low-mass binaries that have undergone mass transfer and drastic mass loss during either a common-envelope phase or a stable Roche-lobe overflow while on the red giant branch (RGB).
Aims: We perform a spectroscopic survey to find binary systems that include l…
Semi-supervised standardized detection of extrasolar planets
Deleuil, M.; Sulis, S.; Mary, D. +1 more
Context. The detection of small exoplanets with the radial velocity (RV) technique is limited by various poorly known noise sources of instrumental and stellar origin. As a consequence, current detection techniques often fail to provide reliable estimates of the significance levels of detection tests in terms of false-alarm rates or p-values.
…
Shapes of galaxies hosting radio-loud AGNs with z ≤ 1
van der Wel, A.; Zheng, X. C.; Röttgering, H. J. A. +1 more
Links between the properties of radio-loud active galactic nuclei (RLAGNs) and the morphology of their hosts may provide important clues for our understanding of how RLAGNs are triggered. In this work, focusing on passive galaxies, we study the shape of the hosts of RLAGNs selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (…