Search Publications
A shock near the virial radius of the Perseus Cluster
Simionescu, A.; Kaastra, J. S.; Zhang, X. +6 more
Context. Previous X-ray studies of the Perseus Cluster, consisting of 85 Suzaku pointings along eight azimuthal directions, revealed a particularly steep decrease in the projected temperature profile near the virial radius (∼r200) towards the northwest (NW).
Aims: To further explore this shock candidate, another 4 Suzaku observatio…
The first heavy-metal hot subdwarf composite binary SB 744
Bastian, A.; Németh, P.; Vos, J. +1 more
Aims: The long-period sdOB+G1V type spectroscopic binary SB 744 reveals strong lines of fluorine and lead in the optical spectrum of the sdOB star and subsolar metallicity in the G1V companion thanks to a radial velocity follow-up study. Using high-quality observations and Gaia astrometric data, we aim to measure the chemical composition and …
Stellar population astrophysics (SPA) with the TNG. The Arcturus Lab
Dalessandro, E.; Sanna, N.; Mucciarelli, A. +4 more
Context. High-resolution spectroscopy in the near-infrared (NIR) is a powerful tool for characterising the physical and chemical properties of cool-star atmospheres. The current generation of NIR echelle spectrographs enables the sampling of many spectral features over the full 0.9-2.4 µm range for a detailed chemical tagging.
Aims: Wit…
Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs
Martín, E. L.; Burgasser, A. J.; Masseron, T. +4 more
Aims: Our goals are to investigate the relative absorption strengths of ammonia and methane using low-resolution H-band (1.5−1.7 microns) spectra obtained in the laboratory and compared with observational spectra of late-T and Y dwarfs, and to estimate what can be expected from the wide-angle low-resolution near-infrared spectroscopic survey …
The VLT-MUSE and ALMA view of the MACS 1931.8-2635 brightest cluster galaxy
Ziegler, B. L.; Postman, M.; Donahue, M. +4 more
We reveal the importance of ongoing in situ star formation in the brightest cluster galaxy (BCG) in the massive cool-core CLASH cluster MACS 1931.8-2635 at a redshift of z = 0.35 by analysing archival VLT-MUSE optical integral field spectroscopy. Using a multi-wavelength approach, we assessed the stellar and warm ionised medium components, which w…
Evolution of the atomic component in protostellar outflows
Eislöffel, J.; Krabbe, A.; Nisini, B. +3 more
Context. We present SOFIA/FIFI-LS observations of three Class 0 and one Class I outflows (Cep E, HH 1, HH 212, and L1551 IRS5) in the far-infrared [O I]63 µm and [O I]145 µm transitions. Spectroscopic [O I]63 µm maps enabled us to infer the spatial extent of warm (T ∼ 500−1200 K), low-excitation a…
Toward a 3D kinetic tomography of Taurus clouds. I. Linking neutral potassium and dust
Hottier, C.; Lallement, R.; Vergely, J. L. +1 more
Context. Gaia parallaxes and photometric measurements open a three-dimensional (3D) era for the Milky Way, including its interstellar (IS) matter. Three-dimensional Galactic dust distributions are constructed in various ways, based on Gaia data and photometric or spectroscopic surveys.
Aims: The assignment of radial motions to IS dust structu…
Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270. Discovery of a post-flare corotating feature
Amado, P. J.; Caballero, J. A.; Czesla, S. +33 more
Context. Active M dwarfs frequently exhibit large flares, which can pose an existential threat to the habitability of any planet in orbit in addition to making said planets more difficult to detect. M dwarfs do not lose angular momentum as easily as earlier-type stars, which maintain the high levels of stellar activity for far longer. Studying you…
KMT-2019-BLG-0797: Binary-lensing event occurring on a binary stellar system
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: We analyze the microlensing event KMT-2019-BLG-0797. The light curve of the event exhibits two anomalous features from a single-lens single-source model, and we aim to reveal the nature of the anomaly.
Methods: It is found that a model with two lenses plus a single source (2L1S model) can explain one feature of the anomaly, but the…
An intriguing globular cluster in the Galactic bulge from the VVV survey
Minniti, D.; Saito, R. K.; Alonso-García, J. +7 more
Context. Globular clusters (GCs) are the oldest objects known in the Milky Way, so each discovery of a new GC is astrophysically important. In the inner Galactic bulge regions these objects are difficult to find due to extreme crowding and extinction. However, recent near-IR surveys have discovered a number of new bulge GC candidates that need to …