Search Publications
Constraining the AGN duty cycle in the cool-core cluster MS 0735.6+7421 with LOFAR data
Edge, Alastair C.; Bonafede, Annalisa; Brienza, Marisa +6 more
Context. MS 0735.6+7421 is a galaxy cluster that hosts a central radio galaxy with a very steep spectrum. The spectrum is produced by one of the most powerful known jetted active galactic nuclei (AGN). The radio plasma, ejected at nearly light speed from the central AGN, has displaced the intra-cluster medium, leaving two pairs of cavities observa…
A calibration of the Rossby number from asteroseismology
García, R. A.; Mathur, S.; Khalatyan, A. +4 more
Stellar activity and rotation are tightly related in a dynamo process. Our understanding of this mechanism is mainly limited by our capability of inferring the properties of stellar turbulent convection. In particular, the convective turnover time is a key ingredient through the estimation of the stellar Rossby number, which is the ratio of the ro…
Mass segregation and sequential star formation in NGC 2264 revealed by Herschel
Cunningham, N.; Lumsden, S. L.; Schneider, N. +16 more
Context. The mass segregation of stellar clusters could be primordial rather than dynamical. Despite the abundance of studies of mass segregation for stellar clusters, those for stellar progenitors are still scarce, so the question concerning the origin and evolution of mass segregation is still open.
Aims: Our goal is to characterize the str…
Close-up view of a luminous star-forming galaxy at z = 2.95
Berta, S.; Ivison, R. J.; Omont, A. +35 more
Exploiting the sensitivity of the IRAM NOrthern Extended Millimeter Array (NOEMA) and its ability to process large instantaneous bandwidths, we have studied the morphology and other properties of the molecular gas and dust in the star forming galaxy, H-ATLAS J131611.5+281219 (HerBS-89a), at z = 2.95. High angular resolution (0.″3) image…
Bottlenecks to interstellar sulfur chemistry. Sulfur-bearing hydrides in UV-illuminated gas and grains
Goicoechea, J. R.; Riquelme, D.; Fuente, A. +8 more
Hydride molecules lie at the base of interstellar chemistry, but the synthesis of sulfuretted hydrides is poorly understood and their abundances often crudely constrained. Motivated by new observations of the Orion Bar photodissociation region (PDR) - 1″ resolution ALMA images of SH+; IRAM 30 m detections of bright H232<…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). III. A pilot study of stellar and accretion properties
Munari, U.; Alcalá, J. M.; Manara, C. F. +8 more
The mass-accretion rate, Ṁacc, is a crucial parameter for the study of the evolution of accretion disks around young low-mass stellar objects (YSOs) and for planet formation studies. The Taurus star forming region (SFR) is rich in pre-main sequence stars, most of them of the T Tauri class. A variety of methodologies have been used in th…
A preserved high-z compact progenitor in the heart of NGC 3311 revealed with MUSE 2D stellar population analysis
Hilker, M.; Richtler, T.; Coccato, L. +3 more
Context. Massive early-type galaxies are believed to be the end result of an extended mass accretion history. The stars formed in situ very early on in the initial phase of the mass assembly might have originated from an extremely intense and rapid burst of star formation. These stars may still be found within the cores of such galaxies at z = 0, …
The Type II supernova SN 2020jfo in M 61, implications for progenitor system, and explosion dynamics
Sollerman, J.; Jerkstrand, A.; Filippenko, A. V. +25 more
We present the discovery and extensive follow-up observations of SN 2020jfo, a Type IIP supernova (SN) in the nearby (14.5 Mpc) galaxy M 61. Optical light curves (LCs) and spectra from the Zwicky Transient Facility (ZTF), complemented with data from Swift/UVOT and near-infrared photometry is presented. These were used to model the 350-day duration…
The ρ Ophiuchi region revisited with Gaia EDR3. Two young populations, new members, and old impostors
Meingast, Stefan; Alves, João; Lombardi, Marco +10 more
Context. Young and embedded stellar populations are important probes of the star formation process. Their properties and the environments they create have the potential to affect the formation of new planets. Paradoxically, we have a better census of nearby embedded young populations than of the slightly more evolved optically visible young popula…
Massive stars in the Small Magellanic Cloud. Evolution, rotation, and surface abundances
Bouret, J. -C.; Martins, F.; Hillier, D. J. +5 more
Context. The evolution of massive stars depends on several physical processes and parameters. Metallicity and rotation are among the most important, but their quantitative effects are not well understood.
Aims: To complement our earlier study on main-sequence stars, we study the evolutionary and physical properties of evolved O stars in the S…