Search Publications
Multiwavelength identification of millisecond pulsar candidates in the Galactic bulge
Kerr, M.; Calore, F.; Schinzel, F. K. +4 more
Context. The existence of a population of millisecond pulsars in the Galactic bulge is supported, along with other evidence, by the Fermi GeV excess, an anomalous γ-ray emission detected almost 15 years ago in the direction of the Galactic center. However, radio surveys searching for pulsations have not yet revealed bulge millisecond pulsars. Aims…
Unveiling the short and faint X-ray transient nature of IGR J17419–2802
Sidoli, L.; Sguera, V.
We report new X-ray results from the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), Swift, Chandra, and XMM–Newton observations of the hitherto poorly studied unidentified X-ray transient IGR J17419‑2802. We studied in detail the temporal, spectral, and energetic properties of three hard X-ray outbursts detected above 20 keV by INTEGR…
Old massive clusters (and a nuclear star cluster?) in the tidal tails of NGC 5238
Cignoni, M.; Tosi, M.; Bellazzini, M. +12 more
New, deep HST photometry allowed us to identify and study eight compact and bright (MV ≤ ‑5.8) star clusters in the outskirts of the star-forming isolated dwarf galaxy NGC 5238 (M* ≃ 108 M⊙). Five of these clusters are new discoveries, and six appear projected onto and/or aligned with the tidal tails rec…
Combining magneto-hydrostatic constraints with Stokes profile inversions. IV. Imposing ∇⋅B = 0 condition
Pastor Yabar, A.; Ruiz Cobo, B.; Borrero, J. M.
Context. Inferences of the magnetic field in the solar atmosphere by means of spectropolarimetric inversions (i.e., Stokes inversion codes) yield magnetic fields that are non-solenoidal (∇ ⋅ B ≠ 0). Because of this, results obtained by such methods are sometimes put into question.
Aims: We aim to develop and implement a new technique that, in…
The VANDELS Survey: Star formation and quenching in two over-densities at 3 < z < 4
Demarco, R.; Castellano, M.; Pentericci, L. +11 more
Context. Exploring galaxy evolution in dense environments, such as proto-clusters, is pivotal for understanding the mechanisms that drive star formation and the quenching of star formation. Aims. This study provides insights into how two over-densities could have impacted the physical properties, such as the star formation rate, stellar mass, morp…
Sifting the debris: Patterns in the SNR population with unsupervised ML methods
Umana, G.; Sciacca, E.; Loru, S. +13 more
Context. Supernova remnants (SNRs) carry vast amounts of mechanical and radiative energy that heavily influence the structural, dynamical, and chemical evolution of galaxies. To this day, more than 300 SNRs have been discovered in the Milky Way, exhibiting a wide variety of observational features. However, existing classification schemes are mainl…
ZTF J185259.31+124955.2: A new evolved disc-eclipsing binary system
Bernhard, Klaus; Lloyd, Christopher
Discs in long-period eclipsing binary systems are rare and can lead to extraordinary eclipsing events. ZTF J185259.31+124955.2 was identified as a candidate disc-eclipsing system through a continuing search programme of ZTF variables with a near-IR excess in the WISE data. Examination of the combined ZTF and ATLAS photometry shows seven eclipses s…
XUV irradiation of young planetary atmospheres. Results from a joint XMM-Newton and HST observation of HIP67522
Micela, G.; Benatti, S.; Pillitteri, I. +3 more
Context. The evaporation and the chemistry of the atmospheres of warm and hot planets are strongly determined by the high-energy irradiation they receive from their parent stars. This is more crucial among young extra-solar systems because of the high activity of stars at early ages. In particular, the extreme-ultraviolet (EUV) part of the stellar…
The GAPS Programme at TNG: LVIII. Two multi-planet systems with long-period substellar companions around metal-rich stars
Scandariato, G.; Marzari, F.; Sozzetti, A. +20 more
Context. Due to observational biases, a large fraction of known exoplanets are short-period objects. However, the search for planets began more than 20 yr ago, and so it is already possible – with the use of a suitable dataset – to begin exploring a wider range of the parameter space, such as that encompassing long-period planets. Aims. The aim of…
X Persei: A study on the origin of its high-energy emission
Fiocchi, M.; Natalucci, L.; Rodi, J.
Aims. The origin of the hard X-ray emission in the Be/X-ray binary system X Persei has long been debated as its atypical 'two-hump' spectrum can be modelled in multiple ways. The main debate focuses on the the high-energy hump, which is fit as either a cyclotron resonance scatter frequency (CRSF) or inverse Comptonization due to bulk Comptonizatio…