Search Publications
Fast flaring observed from XMMU J053108.3-690923 by eROSITA: a supergiant fast X-ray transient in the Large Magellanic Cloud
Haberl, F.; Ducci, L.; Vasilopoulos, G. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are a peculiar class of supergiant high-mass X-ray binary (HMXB) systems characterised by extreme variability in the X-ray domain. In current models, this is mainly attributed to the clumpy nature of the stellar wind coupled with gating mechanisms involving the spin and magnetic field of the neutro…
The diffuse interstellar band around 8620 Å. I. Methods and application to the GIBS data set
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +6 more
Context. Diffuse interstellar bands (DIBs) are interstellar absorption features that widely exist in the optical and near-infrared wavelength range. DIBs play an important role in the lifecycle of the interstellar medium and can also be used to trace the Galactic structure.
Aims: We developed a set of procedures to automatically detect and me…
A transmission spectrum of the planet candidate WD 1856+534 b and a lower limit to its mass
Alonso, R.; Hollands, M. A.; Castro-Rodríguez, N. +7 more
The cool white dwarf WD 1856+534 was found to be transited by a Jupiter-sized object with a mass at or below 14 MJup. We used the GTC telescope to obtain and analyse the photometry and low-resolution spectroscopy of six transits of WD 1856+534 b, with the intention of deriving the slope of the transmission spectrum. Such a slope, assumi…
Solar wind rotation rate and shear at coronal hole boundaries. Possible consequences for magnetic field inversions
Lavraud, B.; Fargette, N.; Rouillard, A. P. +6 more
Context. In situ measurements by several spacecraft have revealed that the solar wind is frequently perturbed by transient structures that have been interpreted as magnetic folds, jets, waves, and flux ropes that propagate rapidly away from the Sun over a large range of heliocentric distances. Parker Solar Probe (PSP), in particular, has detected …
The CH radical at radio wavelengths: revisiting emission in the 3.3 GHz ground-state lines
Menten, Karl M.; Jacob, Arshia M.; Wiesemeyer, Helmut +1 more
Context. The intensities of the three widely observed radio-wavelength hyperfine structure (HFS) lines between the Λ-doublet components of the rotational ground state of CH are inconsistent with local thermodynamic equilibrium (LTE) and indicate ubiquitous population inversion. While this can be qualitatively understood assuming a pumping cycle th…
Estimating [α/Fe] from Gaia low-resolution BP/RP spectra using the ExtraTrees algorithm
Fouesneau, Morgan; Andrae, René; Korn, Andreas J. +2 more
Context. Gaia Data Release 3 will contain more than a billion sources with positions, parallaxes, and proper motions. In addition, for hundreds of millions of stars, it will include low-resolution blue photometer (BP) and red photometer (RP) spectra. Obtained by dispersing light with prisms, these spectra have resolutions that are too low to allow…
The IBISCO survey. I. Multiphase discs and winds in the Seyfert galaxy Markarian 509
Fiore, F.; Piconcelli, E.; Dadina, M. +9 more
We present the analysis of the ALMA CO(2−1) emission line and the underlying 1.2 mm continuum of Mrk 509 with spatial resolution of ∼270 pc. This local Seyfert 1.5 galaxy, optically classified as a spheroid, is known to host an ionised disc, a starburst ring, and ionised gas winds on both nuclear (ultra-fast outflows) and galactic scales. From CO(…
Nowhere to hide: Radio-faint AGN in the GOODS-N field. II. Multi-wavelength AGN selection techniques and host galaxy properties
Muxlow, T. W. B.; Thomson, A. P.; Garrett, M. A. +3 more
Context. Obtaining a census of active galactic nuclei (AGN) activity across cosmic time is critical to our understanding of galaxy evolution and formation. Many AGN classification techniques are compromised by dust obscuration. However, very long baseline interferometry (VLBI) can be used to identify high brightness temperature compact radio emiss…
Stellar Population Astrophysics (SPA) with the TNG. Stock 2, a little-studied open cluster with an eMSTO
Vallenari, A.; Bragaglia, A.; Spina, L. +14 more
Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself, we performed high-resolution spectroscopy in the framework of the Stellar Population Astrophysics project. We employed the High Accuracy Radial velocity Planet Searcher in the N…
The search for extratidal star candidates around Galactic globular clusters NGC 2808, NGC 6266, and NGC 6397 with Gaia DR2 astrometry
Piatti, Andrés E.; Minniti, Dante; Fernández-Trincado, José G. +5 more
Context. Extratidal stars are stellar bodies that end up outside the tidal radius of a cluster as a result of internal processes or external forces acting upon it. The presence and spatial distribution of these stars can give us insights into the past evolution of a cluster inside our Galaxy.
Aims: Previous works suggest that globular cluster…