Search Publications
Around the Spindle Galaxy: The Dark Halo Mass of NGC 3115
Karachentsev, I. D.; Anand, G. S.; Makarova, L. N. +1 more
We report observations of five dwarf galaxies in the vicinity of the luminous S0 galaxy NGC 3115 performed with the Advanced Camera for Surveys on the Hubble Space Telescope. Their distances determined via the Tip of the Red Giant Branch are: 10.05 Mpc (UGCA 193), 9.95 Mpc (KKSG 17), 10.13 Mpc (2MASX-J0957-0915), 10.42 Mpc (2dFGRS-TGN218Z179), and…
Searching for the next Galactic Luminous red nova
Jones, David; Blagorodnova, Nadejda; Erasmus, Nicolas +3 more
Luminous red novae (LRNe) are astrophysical transients believed to be caused by the partial ejection of a binary star's common envelope (CE) and the merger of its components. The formation of the CE is likely to occur during unstable mass transfer, initiated by a primary star which is evolving off the main sequence (a Hertzsprung gap star) and a l…
Recurrent X-ray flares of the black hole candidate in the globular cluster RZ 2109 in NGC 4472
Lodato, G.; Salvaterra, R.; Tiengo, A. +7 more
We report the systematic analysis of the X-ray observations of the ultraluminous X-ray source
Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
Kovács, J.; Claret, A.; Kundra, E. +4 more
Rapidly rotating early-type main-sequence stars with transiting planets are interesting in many aspects. Unfortunately, several astrophysical effects in such systems are not well understood yet. Therefore, we performed a photometric mini-survey of three rapidly rotating stars with transiting planets, namely KELT-17b, KELT-19Ab, and KELT-21b, using…
Stars in the local galactic thick disc and halo in Gaia EDR3: a catalogue of half a million local main-sequence stars with photometric metallicities
Kim, Bokyoung; Lépine, Sebastien
We present a catalogue of 551 214 main-sequence stars in the local (d < 2 kpc) Galactic thick disc and halo, based on a search of stars with large proper motions ($\mu _{\rm tot} \gt 40.0~\rm mas\, yr^{-1}$) in the Gaia Early Data Release 3. We derive photometric metallicity calibrated from the colour-luminosity-metallicity distribution of 20 0…
FSR 1776: A new globular cluster in the Galactic bulge?
Minniti, D.; Saito, R. K.; Fernández-Trincado, J. G. +6 more
Context. Recent near-IR surveys have uncovered a plethora of new globular cluster (GC) candidates towards the Milky Way bulge. These new candidates need to be confirmed as real GCs and properly characterised.
Aims: We investigate the physical nature of FSR 1776, a very interesting star cluster projected towards the Galactic bulge. This object…
Interstellar objects
Moro-Martín, Amaya; Seligman, Darryl Z.
Since 2017, two macroscopic interstellar objects have been discovered in the inner Solar System, both of which are distinct in nature. The first interstellar object, 1I/`Oumuamua, passed within $\sim63$ lunar distances of the Earth, appeared asteroidal lacking detectable levels of gas or dust loss, yet exhibited a nongravitational acceleration. 1I…
The non-thermal emission from the colliding-wind binary Apep
del Palacio, S.; De Becker, M.; Romero, G. E. +2 more
Therecently discovered massive binary system Apep is the most powerful synchrotron emitter among the known Galactic colliding-wind binaries. This makes this particular system of great interest to investigate stellar winds and the non-thermal processes associated with their shocks. This source was detected at various radio bands, and in addition th…
The XMM Cluster Survey: an independent demonstration of the fidelity of the eFEDS galaxy cluster data products and implications for future studies
Romer, A. K.; Mann, R. G.; Klein, M. +10 more
We present the first comparison between properties of clusters of galaxies detected by the eROSITA Final Equatorial-Depth Survey (eFEDS) and the XMM Cluster Survey (XCS). We have compared, in an ensemble fashion, properties from the eFEDS X-ray cluster catalogue with those from the Ultimate XMM eXtragaLactic (XXL) survey project (XXL-100-GC). We f…
2D and Slab Turbulent Cascade Rates in the Inner Heliosphere
Zank, G. P.; Zhao, L. -L.; Telloni, D. +1 more
We present a theoretical and observational study of 2D and slab turbulence cascade (or heating) rates of transverse total turbulence energies, transverse cross helicity, transverse outward and inward Elsässer energy, transverse fluctuating magnetic energy density, and transverse fluctuating kinetic energy from the perihelion of the first Parker So…