Search Publications
Young stellar populations in early-type dwarf galaxies. Occurrence, radial extent, and scaling relations
Peletier, R. F.; Valentijn, E. A.; Hamraz, E. +3 more
Aims: To understand the stellar population content of early-type dwarf galaxies (dEs) and their environmental dependence, we compare the slopes and intrinsic scatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax, Virgo, and Coma. Additionally, we present and compare internal color profiles of these galaxies to identify…
Massive dust clumps in the envelope of the red supergiant VY Canis Majoris
Kamiński, T.
The envelope of the red supergiant VY CMa has long been considered an extreme example of episodic mass loss that is possibly taking place in other cool and massive evolved stars. Recent (sub-)millimeter observations of the envelope revealed the presence of massive dusty clumps within 800 mas of the star and reinforce the picture of drastic mass-lo…
Nature of a shell of young stars in the outskirts of the Small Magellanic Cloud
Bell, Eric F.; Carballo-Bello, Julio A.; Grebel, Eva K. +36 more
Context. Understanding the evolutionary history of the Magellanic Clouds requires an in-depth exploration and characterization of the stellar content in their outer regions, which ultimately are key to tracing the epochs and nature of past interactions.
Aims: We present new deep images of a shell-like overdensity of stars in the outskirts of …
Exploring the dimming event of RW Aurigae A through multi-epoch VLT/X-shooter spectroscopy
Ray, T. P.; Coffey, D.; Natta, A. +6 more
Context. RW Aur A is a classical T Tauri star that has suddenly undergone three major dimming events since 2010. The reason for these dimming events is still not clear.
Aims: We aim to understand the dimming properties, examine accretion variability, and derive the physical properties of the inner disc traced by the CO ro-vibrational emission…
Overview of non-transient γ-ray binaries and prospects for the Cherenkov Telescope Array
Walter, R.; Sidoli, L.; La Palombara, N. +20 more
Aims: Despite recent progress in the field, there are still many open questions regarding γ-ray binaries. In this paper we provide an overview of non-transient γ-ray binaries and discuss how observations with the Cherenkov Telescope Array (CTA) will contribute to their study.
Methods: We simulated the spectral behaviour of the non-transi…
Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10
Dalessandro, E.; Rainer, M.; Bragaglia, A. +6 more
Aims: The Scutum complex in the inner disk of the Galaxy hosts a number of young clusters and associations of red supergiant stars that are heavily obscured by dust extinction. These stars are important tracers of the recent star formation and chemical enrichment history in the inner Galaxy.
Methods: Within the SPA Large Programme at the…
Count-based imaging model for the Spectrometer/Telescope for Imaging X-rays (STIX) in Solar Orbiter
Massa, Paolo; Piana, Michele; Benvenuto, Federico +1 more
The Spectrometer/Telescope for Imaging X-rays (STIX) will study solar flares across the hard X-ray window provided by the Solar Orbiter cluster. Similarly to the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), STIX is a visibility-based imaging instrument that will require Fourier-based image reconstruction methods. However, in this…
Dust emissivity and absorption cross section in DustPedia late-type galaxies
Bianchi, S.; Madden, S. C.; Galliano, F. +16 more
Aims: We compare the far-infrared to sub-millimetre dust emission properties measured in high Galactic latitude cirrus with those determined in a sample of 204 late-type DustPedia galaxies. The aim is to verify if it is appropriate to use Milky Way dust properties to derive dust masses in external galaxies.
Methods: We used Herschel obse…
IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
Östlin, Göran; Roth, Martin M.; Micheva, Genoveva +2 more
Context. Mrk 71/NGC 2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to …
CHANG-ES. XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631
Beck, Rainer; Kamieneski, Patrick; Irwin, Judith +13 more
Aims: NGC 4631 is an interacting galaxy that exhibits one of the largest, gaseous halos observed among edge-on galaxies. We aim to examine the synchrotron and cosmic-ray propagation properties of its disk and halo emission with new radio continuum data.
Methods: Radio continuum observations of NGC 4631 were performed with the Karl G. Jan…