Search Publications
Smoothed Particle Inference Analysis of SNR DEM L71
Frank, Kari A.; Burrows, David N.; Panfichi, Aldo +2 more
Supernova remnants (SNRs) are complex, three-dimensional objects; properly accounting for this complexity when modeling the resulting X-ray emission presents quite a challenge and makes it difficult to accurately characterize the properties of the full SNR volume. We apply for the first time a novel analysis method called smoothed particle inferen…
A new fitting concept for the robust determination of Sérsic model parameters
Amarantidis, Stergios; Breda, Iris; Papaderos, Polychronis +1 more
Context. The Sérsic law (SL) offers a versatile, widely used functional form for the structural characterization of galaxies near and far. Whereas fitting this three-parameter function to galaxies with a genuine SL luminosity distribution (e.g., several local early-type galaxies-ETGs) yields a robust determination of the Sérsic exponent η and effe…
On the origin of the dramatic spectral variability of WPVS 007
Xue, Yongquan; Li, Junyao; Wang, Tinggui +2 more
We report the discovery of large-amplitude mid-infrared variabilities (MIR; ∼0.3 mag) in the Wide-field Infrared Survey Explorer W1 and W2 bands of the low-luminosity narrow-line Seyfert 1 galaxy WPVS 007, which exhibits prominent and varying broad-absorption lines (BALs) with blueshifted velocity up to {∼ } 14 000km s^{-1}. The observed significa…
VEXAS: VISTA EXtension to Auxiliary Surveys. Data Release 1. The southern Galactic hemisphere
Agnello, A.; Spiniello, C.
Context. We present the first public data release of the VISTA EXtension to Auxiliary Surveys (VEXAS), comprising nine cross-matched multi-wavelength photometric catalogues where each object has a match in at least two surveys.
Aims: Our aim is to provide spatial coverage that is as uniform as possible in the multi-wavelength sky and to provi…
Quasi-simultaneous INTEGRAL, SWIFT, and NuSTAR Observations of the New X-Ray Clocked Burster 1RXS J180408.9-342058
Fiocchi, M.; Ubertini, P.; Bazzano, A. +4 more
We report the quasi-simultaneous INTEGRAL, SWIFT, and NuSTAR observations showing spectral state transitions in the neutron star low-mass X-ray binary 1RXS J180408.9-342058 during its 2015 outburst. We present results of the analysis of high-quality broad energy band (0.8-200 keV) data in three different spectral states: high/soft, low/very-hard, …
Variable absorption line in XTE J1810-197
Göğüş, Ersin; Güver, Tolga; Vurgun, Eda +1 more
We report the results of a long-term spectral and timing study of the first transient magnetar, XTE J1810-197 which was discovered in 2003, when its X-ray luminosity increased ≈ 100 fold. We fit X-ray spectra of all archival X-ray observations using a two-component blackbody model, where the cool component is most likely originating from the whole…
Properties and nature of Be stars. 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357
Frémat, Y.; Harmanec, P.; Yang, S. +10 more
Reliable determination of the basic physical properties of hot emission-line binaries with Roche-lobe filling secondaries is important for developing the theory of mass exchange in binaries. It is not easy, however, due to the presence of circumstellar matter. Here, we report the first detailed investigation of a new representative of this class o…
Red-skewed Kα iron lines in GX 13+1
Maiolino, T.; Titarchuk, L.; Frontera, F. +2 more
Context. Broad, asymmetric, and red-skewed Fe Kα emission lines have been observed in the spectra of low-mass X-ray binaries hosting neutron stars (NSs) as a compact object. Because more than one model is able to describe these features, the explanation of where and how the red-skewed Fe lines are produced is still a matter of discussio…
Revisiting the dust properties in the molecular clouds of the Large Magellanic Cloud
Juvela, M.; Ristorcelli, I.; Noriega-Crespo, A. +2 more
Context. Some Galactic molecular clouds show signs of dust evolution as compared to the diffuse interstellar medium, most of the time through indirect evidence such as color ratios, increased dust emissivity, or scattering (coreshine). These signs are not a feature of all Galactic clouds. Moreover, molecular clouds in the Large Magellanic Cloud (L…
Physical properties of the fullerene C60-containing planetary nebula SaSt2-3
Otsuka, Masaaki
We perform a detailed analysis of the fullerene C60-containing planetary nebula (PN) SaSt2-3 to investigate the physical properties of the central star (B0-1II) and nebula based on our own Subaru/HDS spectra and multiwavelength archival data. By assessing the stellar absorption, we derive the effective temperature, surface gravity, and …