Search Publications
Spatial and dynamical structure of the NGC 2264 star-forming region
Micela, G.; Bonito, R.; Peres, G. +7 more
Context. The formation of stars within molecular clouds and the early stages of stellar evolution (e.g., mass accretion and disk dispersal) are all active research topics. The target of this study, NGC 2264, is a benchmark star-forming region in which these issues can be profitably studied.
Aims: We revisit the structure, dynamics, and star-f…
Relativistic electron beams accelerated by an interplanetary shock
Lario, D.; Jebaraj, I. C.; Vainio, R. +16 more
Context. Collisionless shock waves have long been considered to be among the most prolific particle accelerators in the universe. Shocks alter the plasma they propagate through, and often exhibit complex evolution across multiple scales. Interplanetary (IP) traveling shocks have been recorded in situ for over half a century and act as a natural la…
The ALMA-ALPINE [CII] survey: Kennicutt-Schmidt relation in four massive main-sequence galaxies at z ∼ 4.5
Pozzi, F.; Béthermin, M.; Magdis, G. E. +40 more
Aims: The Kennicutt-Schmidt (KS) relation between the gas and the star formation rate (SFR) surface density (Σgas − ΣSFR) is essential to understand star formation processes in galaxies. To date, it has been measured up to z ∼ 2.5 in main-sequence galaxies. In this Letter our aim is to put constraints at z ∼ 4.5 using a …
High-resolution X-ray spectra of RS Ophiuchi (2006 and 2021): Revealing the cause of SSS variability
Ness, J. -U.; Munari, U.; Orio, M. +9 more
Context. The ~ 10-20 yr recurrent symbiotic nova RS Oph exploded on 2021 August 9, the seventh confirmed recorded outburst since 1898. During the previous outburst in 2006, the current fleet of X-ray space observatories was already in operation, and thanks to the longevity of Swift, XMM-Newton, and Chandra, a direct comparison between these two ou…
Euclid preparation. XXX. Performance assessment of the NISP red grism through spectroscopic simulations for the wide and deep surveys
Aussel, H.; Rodighiero, G.; Palazzi, E. +235 more
This work focusses on the pilot run of a simulation campaign aimed at investigating the spectroscopic capabilities of the Euclid Near-Infrared Spectrometer and Photometer (NISP), in terms of continuum and emission line detection in the context of galaxy evolutionary studies. To this purpose, we constructed, emulated, and analysed the spectra of 49…
Discovering strongly lensed quasar candidates with catalogue-based methods from DESI Legacy Surveys
Zou, Hu; Li, Nan; He, Zizhao +3 more
Context. The Hubble tension, revealed by a ~5σ discrepancy between measurements of the Hubble-Lemaitre constant among observations of the early and local Universe, is one of the most significant problems in modern cosmology. In order to better understand the origin of this mismatch, independent techniques to measure H0, such as strong l…
Still alive and kicking: A significant outburst in changing-look AGN Mrk 1018
Granzer, T.; Gaspari, M.; Combes, F. +13 more
Context. Changing-look active galactic nuclei (AGN) have been observed to change their optical spectral type. Mrk 1018 is particularly unique: first classified as a type 1.9 Seyfert galaxy, it transitioned to being a type 1 Seyfert galaxy a few years later before returning to its initial classification as a type 1.9 Seyfert galaxy after ∼30 years.…
Red horizontal branch stars: An asteroseismic perspective
Tailo, Marco; Stokholm, Amalie; Valentini, Marica +7 more
Robust age estimates of red giant stars are now possible thanks to the precise inference of their mass based on asteroseismic constraints. However, there are cases where such age estimates can be highly precise yet very inaccurate. An example is giants that have undergone mass loss or mass transfer events that have significantly altered their mass…
Exploring the chemodynamics of metal-poor stellar populations
Smiljanic, R.; da Silva, A. R.
Context. Metal-poor stars are key for studying the formation and evolution of the Galaxy. Evidence of the early mergers that built up the Galaxy remains in the distributions of abundances, kinematics, and orbital parameters of its stars. Several substructures resulting from these mergers have been tentatively identified in the literature.
Aim…
Precise masses and ages of 1 million RGB and RC stars observed by LAMOST
Huang, Yang; Zhang, Huawei; Wang, Chun +1 more
We construct a catalogue of stellar masses and ages for 696 680 red giant branch (RGB) stars, 180 436 primary red clump (RC) stars, and 120 907 secondary RC stars selected from the LAMOSTDR8. The RGBs, primary RCs, and secondary RCs are identified with the large frequency spacing (∆ν) and period spacing (∆P) estimated from the LAMOST spectra with …