Search Publications
X-ray studies of the Abell 3158 galaxy cluster with eROSITA
Pacaud, F.; Ramos-Ceja, M. E.; Bulbul, E. +13 more
Context. The most nearby clusters are the best places for studying physical and enrichment effects in the faint cluster outskirts. The Abell 3158 cluster (A3158), located at z = 0.059, is quite extended with a characteristic radius r200 = 23.95 arcmin. The metal distribution in the outskirts of this cluster has previously been studied w…
Stellar population of the Rosette Nebula and NGC 2244. Application of the probabilistic random forest
Peña Ramírez, K.; Bouy, H.; Krone-Martins, A. +5 more
Context. Measurements of internal dynamics of young clusters and star-forming regions are crucial to fully understand the process of their formation. A basic prerequisite for this is a well-established and robust list of probable members.
Aims: In this work, we study the 2.8° ×2.6° region in the emblematic Rosette Nebula, centred in the young…
Flares and rotation of M dwarfs with habitable zones accessible to TESS planet detections
Stelzer, B.; Raetz, St.; Magaudda, E. +1 more
Context. More than 4000 exoplanets have been discovered to date, providing the search for a place capable of hosting life with a large number of targets. With the Transiting Exoplanet Survey Satellite (TESS) having completed its primary mission in July 2020, the number of planets confirmed by follow-up observations is growing further. Crucial for …
A 30 kpc Spatially Extended Clumpy and Asymmetric Galactic Outflow at z 1.7
Chisholm, John; Tejos, Nicolas; Rigby, Jane R. +10 more
We image the spatial extent of a cool galactic outflow with fine-structure Fe II* emission and resonant Mg II emission in a gravitationally lensed star-forming galaxy at z = 1.70347. The Fe II* and Mg II (continuum-subtracted) emissions span out to radial distances of ~14.33 and 26.5 kpc, respectively, with maximum spatial extents of ~21 kpc for F…
Discovery of One Neutron Star Candidate from Radial-velocity Monitoring
Liu, Jifeng; Zhang, Haotong; Wang, Song +8 more
We report the discovery of one possible neutron star binary (P orb = 0.8666 days) by using LAMOST low-resolution spectroscopic data. The visible companion is a late A-type dwarf (T eff = 7900 ± 200 K; logg = 4.3 ± 0.2; M = 1.7 ± 0.1 M ⊙; R = 1.7 ± 0.2 R ⊙) at a distance of 1.11 ± 0.03 kpc. No double-line…
UOCS -VIII. UV study of the open cluster NGC 2506 using ASTROSAT★
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +4 more
We study an intermediate-age open cluster (OC) NGC 2506 using the ASTROSAT/UVIT data and other archival data. We identified 2175 cluster members using a machine learning-based algorithm, ML-MOC, on Gaia EDR3 data. Among the cluster members detected in UVIT filters, F148W, F154W, and F169M, we detect nine blue straggler stars (BSS), three yellow st…
Hard-X-ray-selected active galactic nuclei - II. Spectral energy distributions in the 5-45 GHz domain
Laor, Ari; Behar, Ehud; Baldi, Ranieri D. +7 more
A wide-frequency radio study of active galactic nuclei (AGN) is crucial to evaluate the intervening radiative mechanisms responsible for the observed emission and relate them with the underlying accretion physics. We present wide-frequency (5-45 GHz), high-sensitivity (few $\mathrm{{\mu }Jy\, beam^{-1}}$), (sub)-kpc Jansky Very Large Array (JVLA) …
Evidence of ram-pressure stripping of WLM, a dwarf galaxy far away from any large host galaxy
Józsa, Gyula I. G.; McConnachie, Alan W.; Hammer, Francois +5 more
Dwarf galaxies are affected by all the evolutionary processes normally at work in galaxies of any mass. As fainter and less massive galaxies, however, dwarf galaxies are particularly susceptible to environmental mechanisms that can more easily perturb these systems. Importantly, the presence of nearby large galaxies is expected to have a profound …
Thermal and Nonthermal Emission in the Optical-UV Spectrum of PSR B0950+08
Pavlov, George G.; Kargaltsev, Oleg; Abramkin, Vadim +1 more
Based on recent Hubble Space Telescope (HST) observations in the far-UV and ground-based observations in optical bands, Pavlov and colleagues have revealed a thermal component in the spectrum of the old pulsar B0950+08 (spin-down age 17.5 Myr) and estimated a neutron star (NS) surface temperature of (1-3) × 105 K. Our new HST observatio…
Understanding Accretion Variability through TESS Observations of Taurus
Rodriguez, Joseph E.; Espaillat, Catherine C.; Robinson, Connor E.
Interpreting the short-timescale variability of the accreting, young, low-mass stars known as Classical T Tauri stars remains an open task. Month-long, continuous light curves from the Transiting Exoplanet Survey Satellite (TESS) have become available for hundreds of T Tauri stars. With this vast data set, identifying connections between the varia…