Search Publications
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
A Partial Near-infrared Guide Star Catalog for Thirty Meter Telescope Operations
Subramaniam, Annapurni; Subramanian, Smitha; Anupama, G. C. +10 more
At first light, the Thirty Meter Telescope (TMT) near-infrared (NIR) instruments will be fed by a multiconjugate adaptive optics instrument known as the Narrow Field Infrared Adaptive Optics System (NFIRAOS). NFIRAOS will use six laser guide stars to sense atmospheric turbulence in a volume corresponding to a field of view of 2', but natural guide…
SDSS J102915.14+172927.9: Revisiting the chemical pattern
Steffen, M.; Ludwig, H. -G.; Bonifacio, P. +7 more
Context. The small- to intermediate-mass (M < 0.8 M⊙), most metal-poor stars that formed in the infancy of the Universe are still shining today in the sky. They are very rare, but their discovery and investigation brings new knowledge on the formation of the first stellar generations. Aims. SDSS J102915.14+172927.9 is one of the most…
The observational evidence that all microflares that accelerate electrons to high energies are rooted in sunspots
Krucker, Säm; Veronig, Astrid M.; Ryan, Daniel F. +6 more
Context. In general, large solar flares are more efficient at accelerating high-energy electrons than microflares. Nonetheless, sometimes microflares that accelerate electrons to high energies are observed. Their origin is unclear. Aims. We statistically characterized microflares with strikingly hard spectra in the hard X-ray (HXR) range, which me…