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The problem of detecting dark matter filaments in the cosmic web is considered. Weak lensing is an ideal probe of dark matter, and therefore forms the basis of particularly promising detection methods. We consider and develop a number of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 James M. G. Mead , Lindsay J. King , Ian G. McCarthy

The Atacama Large Millimeter/submillimeter Array (ALMA) offers new diagnostic capabilities for studying the Sun, providing complementary insights through high spatial and temporal resolution at millimeter wavelengths. ALMA acts as a linear…

Clusters, filaments, sheets and voids are the building blocks of the cosmic web. In this study, we present and compare two distinct algorithms for finding cosmic filaments and sheets, a task which is far less well established than the…

Astrophysics of Galaxies · Physics 2009-11-13 Youcai Zhang , Xiaohu Yang , Andreas Faltenbacher , Volker Springel , Weipeng Lin , Huiyuan Wang

We present synthetic ALMA observations of Keplerian, protostellar discs in the Class 0 stage studying the emission of molecular tracers like $^{13}$CO, C$^{18}$O, HCO$^+$, H$^{13}$CO$^+$, N$_2$H$^+$, and H$_2$CO. We model the emission of…

Solar and Stellar Astrophysics · Physics 2016-04-20 D. Seifried , Á. Sánchez-Monge , S. Walch , R. Banerjee

Not only source catalogs are extracted from astronomy observations. Their sky coverage is always carefully recorded and used in statistical analyses, such as correlation and luminosity function studies. Here we present a novel method for…

Instrumentation and Methods for Astrophysics · Physics 2014-03-20 Dongwei Fan , Tamás Budavári , Alexander S. Szalay , Chenzhou Cui , Yongheng Zhao

Solar and stellar magnetic patches (i.e., magnetic fluxes that reach the surface from the interior) are believed to be the primary sources of a star's atmospheric conditions. Hence, detecting and identifying these features (also known as…

Solar and Stellar Astrophysics · Physics 2023-08-25 Zahra Tajik , Nastaran Farhang , Hossein Safari , Michael S. Wheatland

The 2D object detection in clean images has been a well studied topic, but its vulnerability against adversarial attack is still worrying. Existing work has improved robustness of object detectors by adversarial training, at the same time,…

Computer Vision and Pattern Recognition · Computer Science 2021-08-27 Weipeng Xu , Hongcheng Huang , Shaoyou Pan

We propose to apply an object point process to automatically delineate filaments of the large-scale structure in redshift catalogues. We illustrate the feasibility of the idea on an example of the recent 2dF Galaxy Redshift Survey, describe…

Astrophysics · Physics 2008-09-26 Radu S. Stoica , Vicent J. Martinez , Enn Saar

In the cosmic web, filaments play a crucial role in connecting walls to clusters and also act as an important stage for galaxy formation and evolution. Recent observational studies claim that filaments have spin. In this study, we examined…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-07 Xiao-Xiao Tang , Peng Wang , Wei Wang , Ming-Jie Sheng , Hao-Ran Yu , Haojie Xu

In this dataset we provide a comprehensive collection of magnetograms (images quantifying the strength of the magnetic field) from the National Aeronautics and Space Administration's (NASA's) Solar Dynamics Observatory (SDO). The dataset…

Solar and Stellar Astrophysics · Physics 2024-02-13 Laura E. Boucheron , Ty Vincent , Jeremy A. Grajeda , Ellery Wuest

The Atacama Large Millimeter Array (ALMA) has revolutionised the field of solar millimetre astronomy with its high angular resolution and cadence. However, with a limited field of view (FOV), targeted observations of highly dynamic…

Solar and Stellar Astrophysics · Physics 2025-09-10 Mats Kirkaune , Sven Wedemeyer , Joshiwa van Marrewijk , Tony Mroczkowski , Thomas W. Morris

Sunspots are regions of decreased brightness on the visible surface of the Sun (photosphere) that are associated with strong magnetic fields. They have been found to be locations associated with solar flares, which occur when energy stored…

Solar and Stellar Astrophysics · Physics 2013-01-24 Sophie A. Murray

Dark matter may interact with the Standard Model through the kinetic mixing of dark photons, $A'$, with Standard Model photons. Such dark matter will accumulate in the Sun and annihilate into dark photons. The dark photons may then leave…

High Energy Physics - Phenomenology · Physics 2017-10-05 Jonathan L. Feng , Jordan Smolinsky , Philip Tanedo

The standard cosmological model ($\Lambda$CDM) predicts the existence of the cosmic web: a distribution of matter into sheets and filaments connecting massive halos. However, observational evidence has been elusive due to the low surface…

Astrophysics of Galaxies · Physics 2020-04-29 Lydia M. Elias , Shy Genel , Amiel Sternberg , Julien Devriendt , Adrianne Slyz , Eli Visbal , Nicolas Bouché

In this paper, we introduce a novel methodology for leveraging shape-based characteristics of magnetograms of active region (AR) patches and provide a novel capability for predicting solar flares covering the entirety of the solar disk (AR…

Computer Vision and Pattern Recognition · Computer Science 2024-06-18 Chetraj Pandey , Temitope Adeyeha , Jinsu Hong , Rafal A. Angryk , Berkay Aydin

This paper focuses on fruit defect detection and glare removal using morphological operations, Glare removal can be considered as an important preprocessing step as uneven lighting may introduce it in images, which hamper the results…

Computer Vision and Pattern Recognition · Computer Science 2012-04-05 Vini Katyal , Deepesh Srivastava

We describe the application of Semantic Segmentation by using the Self Organizing Map technique to an high spatial and spectral resolution dataset acquired along the H$\alpha$ line at 656.28 nm by the Interferometric Bi-dimensional…

Solar and Stellar Astrophysics · Physics 2021-04-21 Schillirò Francesco , Romano Paolo

The imaging of disks around young stars presents extreme challenges in high dynamic range, angular resolution, and sensitivity. Recent instrumental advances have met these challenges admirably, leading to a marked increase in imaging…

Astrophysics · Physics 2007-05-23 David W. Koerner

The energy transition towards photovoltaic solar energy has evolved to be a viable and sustainable source for the generation of electricity. It has effectively emerged as an alternative to the conventional mode of electricity generation for…

Image and Video Processing · Electrical Eng. & Systems 2023-01-02 Divyanshi Dwivedi , Pradeep Kumar Yemula , Mayukha Pal

Modern high-resolution images obtained with space observatories display extremely strong intensity variations across images on all spatial scales. Source extraction in such images with methods based on global thresholding may bring…

Instrumentation and Methods for Astrophysics · Physics 2017-11-15 Alexander Men'shchikov