Search Publications
A census of young stellar objects in two line-of-sight star-forming regions toward IRAS 22147+5948 in the outer Galaxy
Szczerba, Ryszard; Elia, Davide; Fischer, William J. +9 more
Context. Star formation in the outer Galaxy, namely, outside of the Solar circle, has not been extensively studied in part due to the low CO brightness of the molecular clouds linked with the negative metallicity gradient. Recent infrared surveys provide an overview of dust emission in large sections of the Galaxy, but they suffer from cloud confu…
Prominence instability and CMEs triggered by massive coronal rain in the solar atmosphere
Hanslmeier, A.; Gömöry, P.; Zaqarashvili, T. V. +3 more
Context. The triggering process for prominence instability and consequent coronal mass ejections (CMEs) is not fully understood. Prominences are maintained by the Lorentz force against the gravity; therefore, reduction of the prominence mass due to the coronal rain may cause the change of the force balance and hence destabilisation of the structur…
Magnetic fields and hot gas in M 101
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. Studies of nearby spiral galaxies in radio and X-ray wavelengths reveal the structure and energy balance of the magnetic fields and the hot interstellar medium (ISM). In some spiral galaxies, large-scale ordered magnetic fields have been found between the spiral stellar arms (the so-called magnetic arms). One of the considered explanation…
Contribution of flows around active regions to the north-south helioseismic travel-time measurements
Gizon, L.; Poulier, P. -L.; Liang, Z. -C. +1 more
Context. In local helioseismology, the travel times of acoustic waves propagating in opposite directions along the same meridian inform us about horizontal flows in the north-south direction. The longitudinal averages of the north-south helioseismic travel-time shifts vary with the sunspot cycle.
Aims: We aim to study the contribution of infl…
A puzzling 2-hour X-ray periodicity in the 1.5-hour orbital period black widow PSR J1311−3430
Mereghetti, Sandro; Belfiore, Andrea; Salvaterra, Ruben +3 more
Time-domain analysis of an archival XMM-Newton observation unveiled a very unusual variability pattern in the soft X-ray emission of PSR J1311−3430, a black widow millisecond pulsar in a tight binary (PB = 93.8 min) with a very low-mass (M ∼ 0.01 M⊙) He companion star, known to show flaring emission in the optical and in the …
Differential astrometry with Gaia. Investigating relativistic light deflection close to Jupiter
Lattanzi, M. G.; Messineo, R.; Busonero, D. +5 more
Aims: In this paper, we develop a differential astrometric framework that is appropriate for a scanning space satellite such as Gaia. We apply it to the first of the GAREQ fields - the Gaia Relativistic Experiment on Jupiter's quadrupole - which is the fruit of dedicated efforts within the Gala project focused on measuring the relativistic de…
Spectral evidence of solar neighborhood analogs in CALIFA galaxies
Sánchez, S. F.; Barrera-Ballesteros, J. K.; Carigi, L. +3 more
Aims: We introduce a novel nonparametric method to find solar neighborhood analogs (SNAs) in extragalactic integral field spectroscopic surveys. The main ansatz is that the physical properties of the solar neighborhood (SN) should be encoded in its optical stellar spectrum.
Methods: We assume that our best estimate of such a spectrum is …
AGN in the ULIRG HE 0435−5304
Pollo, Agnieszka; Małek, Katarzyna; Hryniewicz, Krzysztof +2 more
Context. HE 0435−5304 from Hamburg European Southern Observatory survey is a quasar that appears in the literature with two conflicting redshift values: ∼1.2 and ∼0.4. It was used in the studies of the intergalactic medium through fitting of the narrow absorption lines in its ultraviolet (UV) spectrum. This source is also known historically as a l…
NIR jets from a clustered region of massive star formation. Morphology and composition in the IRAS 18264-1152 region
Leurini, S.; Ramsay, S.; Caratti o Garatti, A. +6 more
Context. Massive stars play crucial roles in determining the physical and chemical evolution of galaxies. However, they form deeply embedded in their parental clouds, making it challenging to directly observe these stars and their immediate environments. It is known that accretion and ejection processes are intrinsically related, thus observing th…
Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142
Di Folco, Emmanuel; Devinat, Marie; Habart, Émilie +4 more
Context. HD 169142 is part of the class of (pre-)transitional protoplanetary disks showing multiple carbon nanodust spectroscopic signatures (aromatic, aliphatic) dominating the infrared spectrum. Precise constraints on the spatial distribution and properties of carbonaceous dust particles are essential to understanding the physics, radiative tran…