Search Publications
Systematic search for lensed X-ray sources in the CLASH fields
Nonino, Mario; Grillo, Claudio; Rosati, Piero +8 more
Aims: We exploit the high angular resolution of Chandra to search for unresolved X-ray emission from lensed sources in the field of view of 11 CLASH clusters, whose critical lines and amplification maps were previously obtained with accurate strong-lensing models. We consider a solid angle in the lens plane corresponding to a magnification &m…
Properties of the brightest globular cluster in M 81 based on multicolour observations
Ma, Jun; Wang, Shoucheng
Context. Researching the properties of the brightest globular cluster (referred to as GC1) in M 81 can provide a fossil record of the earliest stages of galaxy formation and evolution. The Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolour Sky Survey has carried out deep exposures of M 81.
Aims: We derive the magnitudes in intermediate-ban…
Nonsequential neural network for simultaneous, consistent classification, and photometric redshifts of OTELO galaxies
Cepa, J.; Pérez García, A. M.; Alfaro, E. J. +17 more
Context. Computational techniques are essential for mining large databases produced in modern surveys with value-added products.
Aims: This paper presents a machine learning procedure to carry out a galaxy morphological classification and photometric redshift estimates simultaneously. Currently, only a spectral energy distribution (SED) fitti…
Evidence for local particle acceleration in the first recurrent galactic cosmic ray depression observed by Solar Orbiter. The ion event on 19 June 2020
Fedorov, A.; Kulkarni, S. R.; Lario, D. +61 more
Context. In mid-June 2020, the Solar Orbiter (SolO) mission reached its first perihelion at 0.51 au and started its cruise phase, with most of the in situ instruments operating continuously.
Aims: We present the in situ particle measurements of the first proton event observed after the first perihelion obtained by the Energetic Particle Detec…
Orbital and sub-orbital period determination of the candidate high-mass X-ray binary HD 3191
Luque-Escamilla, Pedro L.; Martí, Josep; Paredes, Josep M. +1 more
Aims: The final aim of this paper is to expand the sparse group of X-ray binaries with gamma-ray counterparts as laboratories to study high-energy processes under physical conditions that periodically repeat.
Methods: A follow-up of a candidate system has been carried out. We applied both photometric and spectroscopic techniques in the o…
A possible far-ultraviolet flux-dependent core mass function in NGC 6357
Giannetti, A.; Massi, F.; Wouterloot, J. G. A. +2 more
Context. NGC 6357 is a galactic star-forming complex (d ~ 1.7 kpc) composed of several HII regions, a few young stellar clusters, and giant molecular clouds. In particular, the HII regions G353.2+0.9, G353.1+0.6, and G353.2+0.7 are associated with three young clusters; the most prominent of these, Pismis 24, contains some of the most massive stars…
Dynamics of nanodust in the vicinity of a stellar corona: Effect of plasma corotation
Czechowski, A.; Mann, I.
Context. In the vicinity of the Sun or other stars, the motion of the coronal and stellar wind plasma must include some amount of corotation, which could affect the dynamics of charged dust particles. In the case of the Sun, this region is now investigated in situ by the Parker Solar Probe. Charged dust particles coming from the vicinity of the Su…
The disk-torus system in active galactic nuclei: possible evidence of highly spinning black holes
Celotti, Annalisa; Ghisellini, Gabriele; Sbarrato, Tullia +1 more
We study the ratio R between the luminosity of the torus and that of the accretion disk, inferred from the relativistic model KERRBB for a sample of approximately 2000 luminosity-selected radio-quiet Type I active galactic nuclei from the Sloan Digital Sky Survey catalog. We find a mean ratio R ≈ 0.8 and a considerable number of sources with R ≳ 1…
Deriving physical parameters of unresolved star clusters. VI. Adaptive aperture photometry of the M31 PHAT star clusters
Stonkutė, Rima; Vansevičius, Vladas; Naujalis, Rokas
Context. This study is the sixth of a series that investigates degeneracy and stochasticity problems present in the determination of the age, mass, extinction, and metallicity of partially resolved or unresolved star clusters in external galaxies when using Hubble Space Telescope broadband photometry. In the fifth publication, it was noticed that …
In-depth investigation of the physical origin of the soft X-ray excess in PG 1448+273
Gu, Qiusheng; Guo, Xiaotong; Ding, Nan +6 more
We present systematic X-ray spectral and variability analyses for the narrow-line Seyfert 1 galaxy (NLsy1), PG 1448+273, using the data from two long-exposure XMM-Newton observations of the source in the different flux states. These X-ray spectral analyses indicate that the two main-stream models of soft X-ray excess, the relativistically smeared …