Search Publications

Detailed analysis of a sample of field metal-poor N-rich dwarfs

Bonifacio, P.; Caffau, E.; Spite, M. +2 more

Aims: The aim of this work is to compare the detailed chemical composition of the field N-rich dwarf stars to the second-generation stars of globular clusters (GCs) in order to investigate the hypothesis that they originated in GCs.
Methods: We measured the abundance of 23 elements (from Li to Eu) in a sample of six metal-poor N-rich star…

Stellar population astrophysics (SPA) with the TNG. The chemical content of the red supergiant population in the Perseus complex

Dalessandro, E.; Sanna, N.; Mucciarelli, A. +3 more

Context. The Perseus complex in the outer disk of the Galaxy hosts a number of clusters and associations of young stars. Gaia is providing a detailed characterization of their kinematic structure and evolutionary properties.
Aims: Within the SPA Large Program at the TNG, we secured HARPS-N and GIANO-B high-resolution optical and near-infrared…

Retrieving the transmission spectrum of HD 209458b using CHOCOLATE: a new chromatic Doppler tomography technique

Rebolo, R.; Pallé, E.; Zapatero Osorio, M. R. +29 more

Multiband photometric transit observations or low-resolution spectroscopy (spectro-photometry) are normally used to retrieve the broadband transmission spectra of transiting exoplanets in order to assess the chemical composition of their atmospheres. In this paper we present an alternative approach for recovering the broadband transmission spectra…

The effect of viewing angle on the Kennicutt-Schmidt relation of the local molecular clouds

Kainulainen, J.; Rezaei, Kh. S.; Spilker, A. +1 more

The Gaia data give us an unprecedented view to the three-dimensional (3D) structure of molecular clouds in the solar neighbourhood. We study how the projected areas and masses of clouds, and consequently the Kennicutt-Schmidt (KS) relation, depend on the viewing angle. We derive the probability distributions of the projected areas and masses for n…

Water emission tracing active star formation from the Milky Way to high-z galaxies

Kristensen, L. E.; Dutkowska, K. M.

Context. The question of how most stars in the Universe form remains open. While star formation predominantly takes place in young massive clusters, the current framework focuses on isolated star formation. This poses a problem when trying to constrain the initial stellar mass and the core mass functions, both in the local and distant Universe.

Broad-band analysis of X-ray pulsar 2S 1845-024

Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more

We present the results of a detailed investigation of the poorly studied X-ray pulsar 2S 1845−024 based on data obtained at the NuSTAR observatory during the type I outburst in 2017. Neither pulse phase-averaged nor phase-resolved spectra of the source show evidence for a cyclotron absorption feature. We also used data obtained from other X-ray ob…

The eROSITA extragalactic CalPV serendipitous catalog

Maitra, Chandreyee; Nandra, Kirpal; Reiprich, Thomas H. +22 more

Context. The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) observatory performed calibration and performance verification (CalPV) observations between September 2019 and December 2019, ahead of the planned 4-yr all-sky surveys. Most of them were deep, pointing-mode observations.
Aims: We present here the X-ray catalog det…

Unveiling the formation of NGC 2915 with MUSE: A counter-rotating stellar disk embedded in a disordered gaseous environment

Lin, Zesen; Chen, Guangwen; Kong, Xu +6 more

NGC 2915 is a unique nearby galaxy that is classified as an isolated blue compact dwarf based on its optical appearance but has an extremely extended H I gas disk with prominent Sd-type spiral arms. To unveil the starburst-triggering mystery of NGC 2915, we performed a comprehensive analysis of deep VLT/MUSE integral field spectroscopic observatio…

Constraining leptonic emission scenarios for the PeVatron candidate HESS J1702−420 with deep XMM-Newton observations

Khélifi, B.; Lemière, A.; Terrier, R. +3 more

Aims: We aim to search for a hidden leptonic accelerator, such as a high-Ė pulsar, associated with the unidentified TeV object HESS J1702−420A.
Methods: We carried out a 72 ks X-ray observation with the XMM-Newton satellite and analyzed the resulting data jointly with the publicly available HESS spectral energy distribution (SED) results…

The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager (Corrigendum)

Vial, J. -C.; Zhang, X.; Peter, H. +146 more