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Searching for redshifted 2.2 MeV neutron-capture lines from accreting neutron stars: Theoretical X-ray luminosity requirements and INTEGRAL/SPI observations
Tsygankov, S.; Santangelo, A.; Ducci, L. +2 more
Accreting neutron stars (NSs) are expected to emit a redshifted 2.2 MeV line due to the capture of neutrons produced through the spallation processes of 4He and heavier ions in their atmospheres. Detecting this emission would offer an independent method for constraining the equation of state of NSs and provide valuable insights into nuc…
LAMOST J040901.83+329355.6 - a new Galactic star with Wolf-Rayet characteristics in the transitional stage from post-asymptotic giant branch to central star of a planetary nebula
Karpov, Sergey; Maryeva, Olga; Moiseev, Alexei +2 more
The similarity in physical conditions in the winds of low-mass post-asymptotic giant branch stars and evolved massive stars leads to the appearance of an interesting phenomenon of spectral mimicry. Because of this, the discovery of every new star with a Wolf-Rayet (WR) spectrum requires a special study of its evolutionary status before it can be i…
eROSITA detection of a cloud obscuration event in the Seyfert AGN EC 04570-5206
Schramm, Malte; Gromadzki, Mariusz; Buckley, David A. H. +13 more
Context. Recent years have seen broad observational support for the presence of a clumpy component within the circumnuclear gas around supermassive black holes (SMBHs). In the X-ray band, individual clouds can manifest themselves when they transit the line of sight to the X-ray corona, temporarily obscuring the X-ray continuum and thereby indicati…
A comparative analysis of the active galactic nucleus and star formation characteristics of broad- and narrow-line Seyfert 1 galaxies
Stalin, C. S.; Mountrichas, G.; Sagar, R. +4 more
We report here our comparative analysis of the active galactic nucleus (AGN) and star formation (SF) characteristics of a sample of narrow-line Seyfert 1 (NLS1) and broad-line Seyfert 1 (BLS1) galaxies. Our sample consisted of 373 BLS1 and 240 NLS1 galaxies and spanned the redshift 0.02 < z < 0.8. The broad-band spectral energy distribution,…
Composition Variation of the 2023 May 16 Solar Energetic Particle Event Observed by SolO and PSP
Mitchell, D. G.; McComas, D. J.; Wimmer-Schweingruber, R. F. +13 more
In this study, we employ the combined charged particle measurements from Integrated Science Investigation of the Sun on board the Parker Solar Probe (PSP) and Energetic Particle Detector on board the Solar Orbiter (SolO) to study the composition variation of the solar energetic particle (SEP) event occurring on 2023 May 16. During the event, SolO …
First joint X-ray solar microflare observations with NuSTAR and Solar Orbiter/STIX
Krucker, Säm; Jeffrey, Natasha L. S.; Grefenstette, Brian W. +5 more
We present the first joint spectral and imaging analysis of hard X-ray (HXR) emission from three microflares observed by the Nuclear Spectroscopic Telescope ARray (NuSTAR) and Solar Orbiter/Spectrometer/Telescope for Imaging X-rays (STIX). We studied 5 joint spectra from GOES A7, B1, and B6 class microflares from active region AR12765 on 2020 June…
Impact crater recognition methods: A review
Wu, Yunzhao; Chen, Dong; Hu, Fan +3 more
Impact craters are formed due to the high-speed collisions between small to medium-sized celestial bodies. Impact is the most significant driving force in the evolution of celestial bodies, and the impact craters provide crucial insights into the formation, evolution, and impact history of celestial bodies. In this paper, we present a detailed rev…
Ultraviolet spectrum reveals the presence of ozone on Jupiter's moon Callisto
Janardhan, P.; Bhardwaj, Anil; Ramachandran, R. +11 more
Sulphur dioxide (SO2) is known to be present on Callisto. In this paper, we studied the chemical evolution of SO2 astrochemical ice induced by irradiation using 9 eV (137.7 nm) vacuum ultraviolet light produced from the high-flux beamline of the storage ring at the National Synchrotron Radiation Research Centre in Taiwan. Ult…
Predicting Photospheric Ultraviolet Emission from Stellar Evolutionary Models
Liu, Jifeng; Wang, Song; Li, Xue +1 more
Stellar ultraviolet (UV) emission serves as a crucial indicator for estimating magnetic activity and evaluating the habitability of exoplanets orbiting stars. In this paper, we present a straightforward method to derive stellar photospheric UV emission for F to M main-sequence stars. By using PARSEC models, we establish relations between near-UV (…
Oblique Electrostatic Solitary and Supersolitary Waves in Earth's Magnetosheath
Singh, Kuldeep; Varghese, Steffy Sara; Saini, Nareshpal Singh +1 more
Nonlinear electrostatic solitary waves (ESWs) are routinely detected at various regions of Earth's magnetosphere using the Wideband Data plasma wave receivers mounted on board the Cluster satellite(s). This mission has facilitated the observation and analysis of ESW characteristics, such as amplitude and temporal duration within the magnetosheath,…