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Eruptive events with exceptionally bright emission in H I Ly-α observed by the Metis coronagraph
Heinzel, P.; Jejčič, S.; Sasso, C. +29 more
Context. Ultraviolet (UV) emission from coronal mass ejections can provide information on the evolution of plasma dynamics, temperature, and elemental composition, as demonstrated by the UV Coronagraph Spectrometer (UVCS) on board the SOlar and Heliospheric Observatory (SOHO). Metis, the coronagraph on board Solar Orbiter, provides for the first t…
VLBI position variability of AGNs is inversely correlated with their photometric variability
Lambert, S.; Secrest, N. J.
Aims: The stability of the International Celestial Reference Frame (ICRF), realized through geodetic very long baseline interferometry (VLBI) positions of thousands of extragalactic objects, is dependent on the individual positional stability of these objects. It has been recently shown that the prevalence of offsets between the VLBI position…
Violation of the equivalence principle induced by oscillating rest mass and transition frequency, and its detection in atom interferometers
Wolf, Peter; Gué, Jordan; Hees, Aurélien
We present a theoretical investigation of the expected experimental signals produced by freely falling atoms with time oscillating mass and transition frequency. These oscillations could be produced in a variety of models, in particular, models of scalar dark matter nonuniversally coupled to the standard matter such as axionlike particles and dila…
The Ancient Star Formation History of the Extremely Low-mass Galaxy Leo P: An Emerging Trend of a Post-reionization Pause in Star Formation
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +12 more
Isolated, low-mass galaxies provide the opportunity to assess the impact of reionization on their star formation histories (SFHs) without the ambiguity of environmental processes associated with massive host galaxies. There are very few isolated, low-mass galaxies that are close enough to determine their SFHs from resolved star photometry reaching…
Limitations and rotation of the two-armed phase spiral in the Milky Way stellar disc
McMillan, P. J.; Bensby, T.; Alinder, S.
Context. The Milky Way's history of recent disturbances is vividly demonstrated by a structure in the vertical phase-space distribution known as the Gaia phase spiral. A one-armed phase spiral has been seen widely across the Milky Way disc, while a two-armed one has only been observed in the solar neighbourhood. Aims. This study aims to determine …
Revealing the burning and soft heart of the bright bare active galactic nucleus ESO 141-G55: X-ray broadband and SED analysis
Grosso, N.; Porquet, D.; Reeves, J. N. +4 more
Context. ESO 141-G55 is a nearby X-ray bright broad-line Seyfert 1 (BLS1) that has been classified as a bare active galactic nucleus (AGN) due to a lack of warm absorption along its line of sight, providing an unhampered view into its disc-corona system. Aims. We aim to probe its disc-corona system thanks to the first simultaneous XMM-Newton and N…
UVIT Study of the MAgellanic Clouds (U-SMAC). II. A Far-UV Catalog of the Small Magellanic Cloud: Morphology and Kinematics of Young Stellar Population
Subramaniam, Annapurni; Subramanian, Smitha; Nayak, Prasanta K. +1 more
The Small Magellanic Cloud (SMC) is an irregular dwarf galaxy that has recently undergone an interaction with the Large Magellanic Cloud. The young massive stars in the SMC formed in the disturbed low-metallicity environment are important targets in astrophysics. We present a catalog of ∼76,800 far-ultraviolet (FUV) sources toward the SMC detected…
The White-light Superflares from Cool Stars in GWAC Triggers
Wang, Jing; Wang, Liang; Liang, En-Wei +16 more
M-type stars are the ones that flare most frequently, but how big their maximum flare energy can reach is still unknown. We present 163 flares from 162 individual M2 through L1-type stars that triggered the GWAC, with flare energies ranging from 1032.2 to 1036.4 erg. The flare amplitudes range from △G = 0.84 to ∼10 mag. Flare…
PYSSED: an automated method of collating and fitting stellar spectral energy distributions
McDonald, Iain; Zijlstra, Albert A.; Cox, Nick L. J. +4 more
Stellar atmosphere modelling predicts the luminosity and temperature of a star, together with parameters such as the effective gravity and the metallicity, by reproducing the observed spectral energy distribution. Most observational data come from photometric surveys, using a variety of passbands. We herein present the Python Stellar Spectral Ener…
Investigating X-ray emission in the GeV-emitting compact symmetric objects PKS 1718-649 and TXS 1146+596
Vignali, C.; Giroletti, M.; Stawarz, Ł. +8 more
Aims: Compact symmetric objects (CSOs) are thought to represent the first step in the evolutionary path of radio galaxies. In the present study, we investigated the X-ray emission of two CSOs confirmed to emit at GeV energies: PKS 1718-649 and TXS 1146+596. Unveiling the origin of their observed high-energy emission is crucial to establishing…