Search Publications
The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430
Donahue, Megan; Mroczkowski, Tony; Clarke, Tracy E. +8 more
We present a broad, multi-wavelength study of RXC J2014.8−2430, the most extreme cool-core cluster in the Representative XMM-Newton Cluster Structure Survey (REXCESS), using Chandra X-ray, Southern Astrophysical Research (SOAR) Telescope spectroscopic and narrow-band imaging, Atacama Large Millimeter/submillimeter Array (ALMA), Very Large Array, a…
First investigation of the diamagnetic cavity boundary layer with a 1D3V PIC simulation
Gunell, H.; Nilsson, H.; Hamrin, M. +3 more
Context. Amongst the different features and boundaries encountered around comets, one remains of particular interest to the plasma community: the diamagnetic cavity. Crossed for the first time at 1P/Halley during the Giotto flyby in 1986 and later met more than 700 times by the ESA Rosetta spacecraft around Comet 67P/Churyumov-Gerasimenko, this re…
Expanding shells around young clusters - S 171/Be 59
Persson, C. M.; Gahm, G. F.; Wilhelm, M. J. C. +2 more
Context. Some HII regions that surround young stellar clusters are bordered by molecular shells that appear to expand at a rate inconsistent with our current model simulations. In this study we focus on the dynamics of Sharpless 171 (including NGC 7822), which surrounds the cluster Berkeley 59.
Aims: We aim to compare the velocity pattern ove…
XMM-Newton study of six massive, X-ray luminous galaxy cluster systems in the redshift range z = 0.25-0.5
Böhringer, H.; Laporte, N.; Ellis, R. S. +2 more
Massive galaxy clusters are interesting astrophysical and cosmological objects to study, but they are relatively rare. In the redshift range z = 0.25-0.5 which is, for example, a favourable region for gravitational lensing studies, about 100 such systems are known. Most of them have been studied in X-rays. In this paper we study the six remaining …
Deep and fast Solar System flybys: the controversial case of WD 0810-353
de la Fuente Marcos, R.; de la Fuente Marcos, C.
Context. Most flybys in the Galactic disk are distant, beyond 104 AU, and have characteristic velocities of ~70 km s−1. However, deep and fast encounters also take place, albeit with lower probability, particularly if one of the objects involved is a stellar remnant ejected during a supernova. WD 0810-353 might be a high velo…
The miniJPAS survey: White dwarf science with 56 optical filters
Tremblay, P. -E.; Mendes de Oliveira, C.; Guerrero, M. A. +21 more
Aims: We analyze the white dwarf population in miniJPAS, the first square degree observed with 56 medium-band, 145 Å in width optical filters by the Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS), to provide a data-based forecast for the white dwarf science with low-resolution (R ∼ 50) photo-spectra.
Methods…
Search for exoplanets around northern circumpolar stars. V. Three likely planetary companions to the giant stars HD 19615, HD 150010, and HD 174205
Jeong, G.; Lee, B. -C.; Park, M. -G. +2 more
Aims: We report the detection of long-period radial velocity (RV) variations in three giant stars, HD 19615, HD 150010, and HD 174205, using precise RV measurements.
Methods: These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey being conducted at the Bohyunsan Optical Astronomy Observator…
IRIS burst properties in active regions
Kleint, L.; Nelson, C. J.
Context. Interface Region Imaging Spectrograph (IRIS) bursts are localised features thought to be driven by magnetic reconnection. Although these events are well-studied, it remains unknown whether their properties vary as their host active regions (ARs) evolve.
Aims: In this article, we aim to understand whether the measurable properties (e.…
Toward measuring the spin of obscured supermassive black holes. A critical assessment with disk megamasers
Celotti, Annalisa; Masini, Alberto; Campitiello, Samuele
Context. Mass and spin are two fundamental properties of astrophysical black holes. While some established indirect methods are adopted to measure both these properties of active galactic nuclei (AGN) when viewed relatively face-on, very few suggested methods exist to measure these properties when AGN are highly inclined and potentially obscured b…
Optical microflares in LS I +61 303 and the search for their multiwavelength counterpart
Luque-Escamilla, Pedro L.; Martí, Josep; del Ser, Daniel +4 more
Context. Stellar sources of gamma rays are one of the front lines in modern astrophysics whose understanding can benefit from observational tools not originally designed for their study.
Aims: We take advantage of the high precision photometric capabilities of present-day space facilities to obtain a new perspective on the optical behavior of…