Search Publications
Clumpy star formation and an obscured nuclear starburst in the luminous dusty z = 4 galaxy GN20 seen by MIRI/JWST
Östlin, G.; Güdel, M.; Colina, L. +28 more
Dusty star-forming galaxies emit most of their light at far-infrared to millimeter wavelengths as their star formation is highly obscured. Far-infrared and millimeter observations have revealed their dust, neutral and molecular gas properties. The sensitivity of JWST at rest-frame optical and near-infrared wavelengths now allows the study of the s…
Abundances of iron-peak elements in accreted and in situ born Galactic halo stars
Skúladóttir, Á.; Amarsi, A. M.; Nissen, P. E. +1 more
Context. Studies of the element abundances and kinematics of stars belonging to the Galactic halo have revealed the existence of two distinct populations: accreted stars with a low [α/Fe] ratio and in situ born stars with a higher ratio.
Aims: Previous work on the abundances of C, O, Na, Mg, Si, Ca, Ti, Cr, Mn, Fe, Ni, Cu, and Zn in high-α an…
SN 2021adxl: A luminous nearby interacting supernova in an extremely low-metallicity environment
Drake, A. J.; Sollerman, J.; Fransson, C. +17 more
SN 2021adxl is a slowly evolving, luminous, Type IIn supernova with asymmetric emission line profiles, similar to the well-studied SN 2010jl. We present extensive optical, near-ultraviolet, and near-infrared photometry and spectroscopy covering ∼1.5 years post discovery. SN 2021adxl occurred in an unusual environment, atop a vigorously star-formin…
X-Shooting ULLYSES: Massive stars at low metallicity. II. DR1: Advanced optical data products for the Magellanic Clouds
Hamann, W. -R.; Blomme, R.; Mehner, A. +34 more
Context. The XShootU project aims to obtain ground-based optical to near-infrared spectroscopy of all targets observed by the Hubble Space Telescope (HST) under the Director's Discretionary program ULLYSES. Using the medium-resolution spectrograph X-shooter, spectra of 235 OB and Wolf-Rayet (WR) stars in subsolar metallicity environments have been…
A census of new globular clusters in the Galactic bulge
Bica, E.; Barbuy, B.; Ortolani, S. +1 more
Context. The number of known globular clusters in the Galactic bulge has been increasing steadily thanks to different new surveys. Aims. The aim of this study is to provide a census of the newly revealed globular clusters in the Galactic bulge, and analyze their characteristics. Methods. In recent years, many globular clusters have been discovered…
JWST discovers an AGN ionization cone but only weak radiatively driven feedback in a powerful z ≈ 3.5 radio-loud AGN
Lehnert, Matthew D.; Zakamska, Nadia L.; Stern, Daniel +7 more
We present the first results from a JWST program studying the role played by powerful radio jets in the evolution of the most massive galaxies at the onset of cosmic noon. Using NIRSpec integral field spectroscopy, we detected 24 rest-frame optical emission lines from the z = 3.5892 radio galaxy 4C+19.71, which contains one of the most energetic r…
The Galactic bulge exploration. I. The period-absolute magnitude-metallicity relations for RR Lyrae stars for GBP, V, G, GRP, I, J, H, and Ks passbands using Gaia DR3 parallaxes
Prudil, Z.; Kunder, A.; Koch-Hansen, A. J. +1 more
We present a new set of period-absolute magnitude-metallicity (PMZ) relations for single-mode RR Lyrae stars calibrated for the optical GBP, V, G, GRP, near-infrared I, J, H, and Ks passbands. We compiled a large dataset (over 100 objects) of fundamental and first-overtone RR Lyrae pulsators consisting of mean inte…
The first degree-scale starlight-polarization-based tomography map of the magnetized interstellar medium
Eriksen, H. K.; Ghosh, T.; Gjerløw, E. +21 more
We present the first degree-scale tomography map of the dusty magnetized interstellar medium (ISM) from stellar polarimetry and distance measurements. We used the RoboPol polarimeter at Skinakas Observatory to conduct a survey of the polarization of starlight in a region of the sky of about four square degrees. We propose a Bayesian method to deco…
CARMENES input catalog of M dwarfs. VII. New rotation periods for the survey stars and their correlations with stellar activity
Nagel, E.; Amado, P. J.; Caballero, J. A. +40 more
Aims: Knowledge of rotation periods (Prot) is important for understanding the magnetic activity and angular momentum evolution of late-type stars, as well as for evaluating radial velocity signals of potential exoplanets and identifying false positives. We measured photometric and spectroscopic Prot for a large sample of…
Correlation between accretion rate and free-free emission in protoplanetary disks. A multiwavelength analysis of central mm/cm emission in transition disks
van der Marel, N.; van der Tak, F. F. S.; Francis, L. +3 more
Context. The inner regions of protoplanetary disks are believed to be the primary locations of planet formation and the processes that influence the global evolution of the disk, such as magnetohydrodynamic winds and photoevaporation. Transition disks with large inner dust cavities are ideal targets for studying the inner regions (of tens of au) o…