Sumit Jaiswal
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View article: A Multimodal, Stacked Ensemble Framework for Robust Audio-Visual Deepfake Detection
A Multimodal, Stacked Ensemble Framework for Robust Audio-Visual Deepfake Detection Open
View article: A Machine Learning made Catalog of FR-II Radio Galaxies from the FIRST Survey
A Machine Learning made Catalog of FR-II Radio Galaxies from the FIRST Survey Open
We present an independent catalog (FRIIRGcat) of 45,241 Fanaroff-Riley Type II (FR-II) radio galaxies compiled from the Very Large Array Faint Images of the Radio Sky at Twenty-centimeters (FIRST) survey and employed the deep learning meth…
View article: Radio sources segmentation and classification with deep learning
Radio sources segmentation and classification with deep learning Open
Modern large radio continuum surveys have high sensitivity and resolution, and can resolve previously undetected extended and diffuse emissions, which brings great challenges for the detection and morphological classification of extended s…
View article: Radio Sources Segmentation and Classification with Deep Learning
Radio Sources Segmentation and Classification with Deep Learning Open
Modern large radio continuum surveys have high sensitivity and resolution, and can resolve previously undetected extended and diffuse emissions, which brings great challenges for the detection and morphological classification of extended s…
View article: SKA Science Data Challenge 2: analysis and results
SKA Science Data Challenge 2: analysis and results Open
The Square Kilometre Array Observatory (SKAO) will explore the radio sky to new depths in order to conduct transformational science. SKAO data products made available to astronomers will be correspondingly large and complex, requiring the …
View article: High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects
High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects Open
Observational studies of GHz peaked spectrum (GPS) sources contribute to the understanding of the radiative properties and interstellar environment of host galaxies. We present the results from the multi-frequency high-resolution VLBI obse…
View article: High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects
High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects Open
Observational studies of GHz peaked spectrum (GPS) sources contribute to the understanding of the radiative properties and interstellar environment of host galaxies. We present the results from the multi-frequency high-resolution VLBI obse…
View article: Interactions between the Jet and Disk Wind in Nearby Radio-intermediate Quasar III Zw 2
Interactions between the Jet and Disk Wind in Nearby Radio-intermediate Quasar III Zw 2 Open
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of the radio-intermediate quasar III Zw 2. We detect two jet knots, J1 and J2…
View article: Radio Sources Segmentation and Classification with Deep Learning
Radio Sources Segmentation and Classification with Deep Learning Open
View article: Interactions between the jet and disk wind in a nearby radio intermediate quasar III Zw 2
Interactions between the jet and disk wind in a nearby radio intermediate quasar III Zw 2 Open
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of a radio-intermediate quasar III Zw 2. We detect two jet knots J1 and J2 on…
View article: Is the X-ray bright z = 5.5 quasar SRGE J170245.3+130104 a blazar?
Is the X-ray bright z = 5.5 quasar SRGE J170245.3+130104 a blazar? Open
Jets may have contributed to promoting the growth of seed black holes in the early Universe, and thus observations of radio-loud high-redshift quasars are crucial to understanding the growth and evolution of the early supermassive black ho…
View article: Is the X-ray bright <i>z</i> = 5.5 quasar SRGE J170245.3+130104 a blazar?
Is the X-ray bright <i>z</i> = 5.5 quasar SRGE J170245.3+130104 a blazar? Open
Jets may have contributed to promoting the growth of seed black holes in the early Universe, and thus observations of radio-loud high-redshift quasars are crucial to understanding the growth and evolution of the early supermassive black ho…
View article: Radio Observations of Four Active Galactic Nuclei Hosting Intermediate-mass Black Hole Candidates: Studying the Outflow Activity and Evolution
Radio Observations of Four Active Galactic Nuclei Hosting Intermediate-mass Black Hole Candidates: Studying the Outflow Activity and Evolution Open
Observational searches for intermediate-mass black holes (IMBHs; 10 2 –10 6 M ⊙ ) include relatively isolated dwarf galaxies. For those that host active galactic nuclei (AGNs), the IMBH nature may be discerned through the accretion–jet act…
View article: Radio observations of four active galactic nuclei hosting intermediate-mass black hole candidates: studying the outflow activity and evolution
Radio observations of four active galactic nuclei hosting intermediate-mass black hole candidates: studying the outflow activity and evolution Open
Observational searches for intermediate-mass black holes (IMBHs; $10^2 - 10^6$ $M_\odot$) include relatively isolated dwarf galaxies. For those that host active galactic nuclei (AGNs), the IMBH nature may be discerned through the accretion…
View article: VLBI properties of compact interplanetary scintillators detected by the Murchison Widefield Array
VLBI properties of compact interplanetary scintillators detected by the Murchison Widefield Array Open
Interplanetary scintillation (IPS) provides an approach for identifying the presence of sub-arcsec structures in radio sources, and very long baseline interferometry (VLBI) technique can help verify whether the IPS sources have fine struct…
View article: The obstructed jet in Mrk 231
The obstructed jet in Mrk 231 Open
Mrk 231 is the closest radio-quiet quasar known and one of the most luminous infrared galaxies in the local Universe. It is characterized by the co-existence of a radio jet and powerful multiphase multiscale outflows, making it an ideal la…
View article: Square Kilometre Array Science Data Challenge 1: analysis and results
Square Kilometre Array Science Data Challenge 1: analysis and results Open
As the largest radio telescope in the world, the Square Kilometre Array (SKA) will lead the next generation of radio astronomy. The feats of engineering required to construct the telescope array will be matched only by the techniques devel…
View article: H <scp>i</scp> imaging of dwarf star-forming galaxies: masses, morphologies, and gas deficiencies
H <span>i</span> imaging of dwarf star-forming galaxies: masses, morphologies, and gas deficiencies Open
The Giant Meter-wave Radio Telescope observations of the H i 21 cm-line emission from 13 nearby dwarf star-forming galaxies are presented. These galaxies are selected from the catalogues of Wolf−Rayet galaxies having very young (≤10 Myr) s…
View article: J1110+4817 – a compact symmetric object candidate revisited
J1110+4817 – a compact symmetric object candidate revisited Open
Compact symmetric objects (CSOs) are radio-emitting active galactic nuclei (AGNs) typically with a double-lobed radio structure confined to within 1 kpc. CSOs represent the earliest evolutionary phase of jetted AGNs. Some of them may event…
View article: Space very long baseline interferometry in China
Space very long baseline interferometry in China Open
View article: Jet-powered Outflows in Supermassive Black Hole Binary Candidate SDSS J1048+0055
Jet-powered Outflows in Supermassive Black Hole Binary Candidate SDSS J1048+0055 Open
The search and study of close pairs of supermassive black holes (SMBHs) is important in the study of galaxy mergers that can possibly trigger active galactic nucleus (AGN) activity, and in the context of their evolution into the gravitatio…
View article: Progress and Perspective of Space VLBI in China
Progress and Perspective of Space VLBI in China Open
Space Very Long Baseline Interferometry (VLBI) has unique applications in high-resolution imaging of fine structure of astronomical objects and high-precision astrometry, owing to the key long space-Earth or space-space baselines beyond th…
View article: A Cosmic Microscope to Probe the Universe from Present to Cosmic Dawn:Dual-element Low-frequency Space VLBI Observatory
A Cosmic Microscope to Probe the Universe from Present to Cosmic Dawn:Dual-element Low-frequency Space VLBI Observatory Open
A space-based very long baseline interferometry (VLBI) programme, named as\nthe Cosmic Microscope, is proposed to involve dual VLBI telescopes in the space\nworking together with giant ground-based telescopes (e.g., Square Kilometre\nArray…
View article: Optical spectroscopy of star-forming regions in dwarf Wolf–Rayet galaxies
Optical spectroscopy of star-forming regions in dwarf Wolf–Rayet galaxies Open
We present here spatially-resolved optical spectroscopic observations of four\nnearby dwarf Wolf-Rayet (WR) galaxies. The ages of the most recent starburst\nevents in these galaxies are found between 3 and 10 Myr. The gas-phase\nmetallicit…
View article: Tidal interaction, star formation and chemical evolution in blue compact dwarf galaxy Mrk 22
Tidal interaction, star formation and chemical evolution in blue compact dwarf galaxy Mrk 22 Open
The optical spectroscopic and radio interferometric HI 21 cm-line observations of the blue compact dwarf galaxy Mrk 22 are presented. The Wolf-Rayet (WR) emission line features corresponding to high ionization lines of HeII $\lambda$4686 a…
View article: Hα imaging survey of Wolf–Rayet galaxies: morphologies and star formation rates
Hα imaging survey of Wolf–Rayet galaxies: morphologies and star formation rates Open
The Hα and optical broad-band images of 25 nearby Wolf–Rayet (WR) galaxies are presented. The WR galaxies are known to have a recent (≤10 Myr) and massive star formation episode. The photometric Hα fluxes are estimated and corrected for ex…