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The Accelerating Decline of the Mass Transfer Rate in the Recurrent Nova T Pyxidis
Williams, Robert E.; Sion, Edward M.; Godon, Patrick +3 more
The recurrent nova T Pyxidis (T Pyx) has erupted six times since 1890, with its last outburst in 2011, and the relatively short recurrence time between classical nova explosions indicates that T Pyx must have a massive white dwarf (WD) accreting at a high rate. It is believed that, since its outburst in 1890, the mass transfer rate in T Pyx was ve…
Searching for pairs of actively accreting supermassive black holes in the Gaia FPR GravLens catalog
Galluccio, L.; Slezak, E.; Mahé, C.
Observational data on dual supermassive black holes (SMBHs) are scarce, even though they should be common according to the current hierarchical formation model for galaxies. We present hereby a method to detect such dual systems, involving an already known quasar, as two luminosity peaks with angular separations smaller than one arcsecond (1″). It…
Unsteady Dungey cycle from the point of view of Stokes' theorem
Semenov, Vladimir S.; Kubyshkin, Igor V.; Tsyganenko, Nikolai A. +3 more
The Dungey cycle is considered from the formation of a magnetic barrier and necessary for dayside reconnection conditions till the electric field generation around the Birkeland current loop and magnetic flux circulation balance. Data-based modeling of the magnetosheath magnetic field makes it possible to quantitatively assess the main factors tha…
Predicting the Energetic Proton Flux with a Machine Learning Regression Algorithm
Marcucci, Maria Federica; Laurenza, Monica; Benella, Simone +1 more
The need for real-time monitoring and alerting systems for space weather hazards has grown significantly in the last two decades. One of the most important challenges for space mission operations and planning is the prediction of solar proton events (SPEs). In this context, artificial intelligence and machine learning techniques have opened a new …
Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE
Zhang, Jingyi; Zhang, Yanxia; Kang, Zihan +3 more
Classifying and summarizing large data sets from different sky survey projects is essential for various subsequent scientific research. By combining data from 4XMM-DR13, Sloan Digital Sky Survey (SDSS) DR18, and CatWISE, we formed an XMM-WISE-SDSS sample that included information in the X-ray, optical, and infrared bands. By cross matching this sa…
Serendipitous Catch of a Giant Jellyfish: An Ionized Nebula around 3C 275.1 with 170 kpc Long Tails
Li, Zhenzhen; Wang, Junfeng; Zhao, Qinyuan
3C 275.1 is a blue quasar at z = 0.55522, hosting powerful outflows and residing in a complex environment. We present a serendipitously detected giant nebula surrounding 3C 275.1, which shows morphological features resembling those of objects known as "jellyfish galaxies," with extremely long tails of ionized gas extending to 170 kpc in projection…
A Catalog of 13CO Clumps from the MWISP in l = 10°–20°
Chen, Zhiwei; Jiang, Zhibo; Zeng, Xiangyun +8 more
In this study, we present a catalog of molecular clumps extracted from 13CO (J = 1 ‑ 0) emission data of the Milky Way Imaging Scroll Painting (MWISP) project. The data covers the inner Milky Way within the longitude range 10° ≤ l ≤ 20° and the latitude strip of ∣b∣ ≤ 5.°25. The workflow for the extraction of clumps, namely Facet-SS-3D-…
The origin of the X-ray luminosity of the green pea galaxies: X-ray binaries or active galactic nuclei?
Luo, A. -Li; Zheng, Zhenya; Zhang, Wei +3 more
Context. Green pea galaxies (GPs) are renowned for their compact sizes, low masses, strong emission lines, high star formation rates (SFRs), and being analogs to high-z Lyα-emitting galaxies. Aims. This investigation focuses on a curated sample of six GPs with X-ray detections, sourced from XMM-Newton, Swift, Chandra and eROSITA, with the aim to e…
Five new eclipsing binaries with low-mass companions
Gandolfi, D.; Persson, C. M.; Deeg, H. J. +18 more
Precise space-based photometry from the Transiting Exoplanet Survey Satellite results in a huge number of exoplanetary candidates. However, the masses of these objects are unknown and must be determined by ground-based spectroscopic follow-up observations, frequently revealing the companions to be low-mass stars rather than exoplanets. We present …
A novel high-z submm galaxy efficient line survey in ALMA Bands 3 through 8 - an ANGELS pilot
Berta, S.; Andreani, P.; Ivison, R. J. +32 more
We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5-0.1 arcsec) for 16 bright southern Herschel sources at