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X-Ray and GeV-γ-Ray Emission Property of TeV Compact Symmetric Object PKS 1413+135 and Implication for Episodic Jet Activity
Liang, En-Wei; Yao, Su; Zhang, Hai-Ming +3 more
PKS 1413+135, a compact symmetric object (CSO) with a two-sided parsec-scale structure in its miniature radio morphology, is spatially associated with 4FGL J1416.1+1320 and recently detected with MAGIC telescopes. We comprehensively analyze its X-ray and gigaelectronvolt γ-ray observation data to reveal its high-energy radiation physics. It is fou…
Extended far-ultraviolet emission in distant dwarf galaxies
Gogoi, Rupjyoti; Saha, Kanak; Combes, Francoise +3 more
Blue compact dwarf (BCD) galaxies are low-luminosity (absolute K-band magnitude, MK > −21 mag)1, metal-poor (1/50 ≤ Z/Z⊙ ≤ 1/2, where Z is the metallicity in terms of the solar metallicity Z⊙)2, centrally concentrated3 galaxies with bright clumps of star formation4. Co…
Astrometric mass measurement of compact companions in binary systems with Gaia
Liu, Jifeng; Gao, Jian; Liao, Shilong +3 more
Context. For binary systems with an unseen primary and a luminous secondary, the astrometric wobble of the secondary could be used to study the primary. With Gaia, it is possible to measure the mass of the black hole or neutron star with a luminous companion (hereafter BH/NS-LC).
Aims: Our aim is to provide a method for predicting Gaia's abil…
A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam
Ramsay, Gavin; Garnavich, Peter; Littlefield, Colin +7 more
We present TESS photometry of the asynchronous polar BY Cam, which undergoes a beat cycle between the 199.384 min white dwarf (WD) spin period and the 201.244 min orbital period. This results in changes in the flow of matter onto the WD. The TESS light curve covers 92% of the beat cycle once and 71% of the beat cycle twice. The strongest photometr…
Swift J0503.7-2819: a Short-period Asynchronous Polar or Stream-fed Intermediate Polar
Halpern, J. P.
We analyze a 7.4 hr XMM-Newton light curve of the cataclysmic variable Swift J0503.7-2819, previously classified using optical periods as an intermediate polar (IP) with an orbital period of 0.0567 days. A photometric signal at 975 s, previously suggested to be the spin period, is not present in X-rays and is readily understood as a quasiperiodic …
He-star donor AM CVn stars and their progenitors as LISA sources
Yungelson, L.; Liu, W. -M.; Kuranov, A.
Context. Ultracompact cataclysmic variables (CVs) of the AM CVn type are deemed to be important verification sources for the future space gravitational wave detectors such as the Laser Interferometer Space Antenna (LISA).
Aims: We model the present-day Galactic population of AM CVn stars with He-star donors. Such a population has long expecte…
Robust Inference of Neutron-star Parameters from Thermonuclear Burst Observations
Galloway, Duncan K.; Goodwin, Adelle; Johnston, Zac +1 more
Thermonuclear (type-I) bursts arise from unstable ignition of accumulated fuel on the surface of neutron stars in low-mass X-ray binaries. Measurements of burst properties in principle enable observers to infer the properties of the host neutron star and mass donors, but a number of confounding astrophysical effects contribute to systematic uncert…
A first eROSITA view of ultracool dwarfs
Salvato, M.; Stelzer, B.; Coffaro, M. +2 more
We present the first X-ray detections of ultracool dwarfs (UCDs) from the first all-sky survey of the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) onboard the Russian Spektrum-Roentgen-Gamma mission. We use three publicly available input catalogs of spectroscopically confirmed UCDs and Gaia-selected UCD candidates that togeth…
The Internal Line-of-Sight Kinematics of NGC 346: The Rotation of the Core Region
Sabbi, Elena; Nota, Antonella; Zeidler, Peter
We present the stellar radial velocity analysis of the central $1^{\prime} \times 1^{\prime} $ of the young massive Small Magellanic Cloud star cluster NGC 346. Using VLT/MUSE integral field spectroscopy in combination with Hubble Space Telescope photometry, we extract 103 spectra of cluster member stars suited to measure accurate line-of-sight ki…
An X-ray view of the ambiguous nuclear transient AT2019pev
Kochanek, C. S.; Grupe, D.; Mathur, S. +3 more
AT2019pev is a nuclear transient in a narrow-line Seyfert 1 galaxy at z = 0.096. The archival ultraviolet, optical, and infrared data showed features of both tidal disruption events and active galactic nuclei (AGNs), and its nature is not fully understood. We present detailed X-ray observations of AT2019pev taken with Swift, Chandra, and NICER ove…