Search Publications
Improving INTEGRAL/SPI data analysis of GRBs
Greiner, Jochen; Siegert, Thomas; Biltzinger, Björn +1 more
The spectrometer on the international gamma-ray astrophysics laboratory (INTEGRAL/SPI) is a coded mask instrument observing since 2002 in the keV to MeV energy range, which covers the peak of the νFν spectrum of most gamma-ray bursts (GRBs). Since its launch in 2008, the gamma-ray burst monitor (GBM) on board the Fermi satellite has been the prima…
Scaling properties of magnetic field fluctuations in the quiet Sun
Giannattasio, F.; Berrilli, F.; Consolini, G. +1 more
Context. The study of the dynamic properties of small-scale magnetic fields in the quiet photosphere is important for several reasons: (i) it allows us to characterise the dynamic regime of the magnetic field and points out some aspects that play a key role in turbulent convection processes; (ii) it provides details of the processes and the spatia…
Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods. I. Spectral analysis
Paltani, Stéphane; Eckert, Dominique; Ge, Lingsong
X-ray spectra of active galactic nuclei (AGN) consist of several different emission and absorption components. To determine the spectral parameters, these components are often fitted manually with models chosen on a case-by-case basis. However, this approach has two problems. First, it becomes very hard for a survey with a large number of sources.…
Anisotropic nonthermal motions in the transition region of solar active regions
Peter, Hardi; Xia, Lidong; Huang, Zhenghua +1 more
Context. We study the nonthermal motions in the transition region of active regions (ARs) using center-to-limb observations of Si IV 1394 Å and 1403 Å lines.
Aims: The aim of this study is to investigate the characteristics of nonthermal motions in the transition region of ARs using the center-to-limb measurement.
Methods: We used Interf…
Evaluating the feasibility of interpretable machine learning for globular cluster detection
Fahrion, Katja; Dold, Dominik
Extragalactic globular clusters (GCs) are important tracers of galaxy formation and evolution because their properties, luminosity functions, and radial distributions hold valuable information about the assembly history of their host galaxies. Obtaining GC catalogues from photometric data involves several steps which will likely become too time-co…
New insights into the Triangulum Australis supercluster of galaxies
Böhringer, Hans; Lacerna, Ivan; Quintana, Hernán +1 more
The Triangulum Australis cluster is one of about a dozen nearby massive cluster systems which contribute to the gravitational pull behind the so-called Great Attractor that is dominated by the nearby Shapley Supercluster mass, which conforms the galaxy velocity flows observed in that general direction. Here, we study the structure and dynamical ma…
Morpho-kinematics of MACS J0416.1-2403 low-mass galaxies
Böhm, A.; Ziegler, B. L.; Maier, C. +2 more
We use optical integral field spectroscopy from VLT/MUSE, as well as photometric observations from Hubble Space Telescope and VLT/HAWK-I, to study the morpho-kinematics of 17 low-mass (log(M/M⊙) < 9.5) MACS J0416.1-2403 cluster galaxies at R200 and five field galaxies with a redshift of z ∼ 0.4. By measuring fluxes of stro…
Revisiting the high-mass transfer close binary star system AU Monocerotis
Shore, Steven N.; Armeni, Antonio
Context. AU Monocerotis is an eclipsing, double-lined spectroscopic binary with a period of 11 days that is in a state of extreme mass transfer, consisting of a main sequence B-type embedded in a thick accretion disk fed by a Roche lobe overflowing evolved G-type companion. It is also one of the double periodic variable Algol-type binaries.
A…
Candidate cosmic filament in the GJ526 field, mapped with the NIKA2 camera
Berta, S.; Aussel, H.; Adam, R. +44 more
Distinctive large-scale structures have been identified in the spatial distribution of optical galaxies up to redshift z ∼ 1. In the more distant universe, the relationship between the dust-obscured population of star-forming galaxies observed at millimetre wavelengths and the network of cosmic filaments of dark matter apparent in all cosmological…
Exploring the region encompassing γ Cygni SNR and MAGIC J2019+408 with the GMRT at 325 and 610 MHz
Paredes, J. M.; Strzys, M.; Ishwara-Chandra, C. H. +2 more
Context. γ Cygni is a young supernova remnant located in the Cygnus region. MAGIC (Major Atmospheric Gamma Imaging Cherenkov) telescopes detected TeV emission (MAGIC J2019+408) to the north-west of this remnant, ~5' from its border.
Aims: We want to identify the radio sources within the region encompassing γ Cygni and MAGIC J2019+408 to shed …