Explanipedia

Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA Open

S. M. Wagh, M. Pandey-Pommier, Nirupam Roy, Md. Abdur Rashid, Alexandre Marcowith , et al. · 2024

Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various physical propert…

Exploring neutral hydrogen in the radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and prospects with the SKA Open

S. M. Wagh, M. Pandey-Pommier, Nirupam Roy, Md Rashid, Alexandre Marcowith , et al. · 2024

The empirical studies of cold gas content serve as an essential aspect in comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on variou…

LOFAR discovery of a quiet emission mode in PSR B0823+26 Open

C. Sobey, Neil J. Young, J. W. T. Hessels, P. Weltevrede, A. Noutsos , et al. · 2024

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over time-scales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insigh…

Status of Women in Astronomy: A need for advancing inclusivity and equal opportunities Open

M. Pandey-Pommier, Arianna Piccialli, B. J. Wilkes, Priya Hasan, Santiago VargasDominguez , et al. · 2023

Women in the Astronomy and STEM fields face systemic inequalities throughout their careers. Raising awareness, supported by detailed statistical data, represents the initial step toward closely monitoring hurdles in career progress and add…

SKA Science Data Challenge 2: analysis and results Open

Philippa Hartley, A Bonaldi, Róbert Braun, J. N. H. S. Aditya, Stéphane Aicardi , et al. · 2023

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 …

Exploring diffuse radio emission in galaxy clusters and groups with the uGMRT and the SKA Open

Surajit Paul, Ruta Kale, Abhirup Datta, Aritra Basu, Sharanya Sur , et al. · 2022

Diffuse radio emission has been detected in a considerable number of galaxy clusters and groups, revealing the presence of pervasive cosmic magnetic fields, and of relativistic particles in the large-scale structure (LSS) of the Universe. …

IAU Women in Astronomy Working Group activities and survey results Open

M. Pandey-Pommier, Arianna Piccialli · 2022

The gender imbalance and diversity dimension of science and technology has become one of the most important and debated issues worldwide, impacting society at every level. The International Astronomical Union, through its Executiv…

THE IAU-WOMEN IN ASTRONOMY WORKING GROUP AND INCLUSIVITY Open

Priya Hasan, M. Pandey-Pommier, S. Vargas Domínguez, A. Piccialli, Alshaimaa Hassanin , et al. · 2022

The International Astronomical Union Women in Astronomy (IAU WiA) working group (WG) is a part of the IAU Executive Committee that supports the needs and endeavours of women astronomers and initiates actions to advance equality of opportun…

Characterising the Extended Morphologies of BL Lacertae Objects at 144 MHz with LOFAR Open

S. Mooney, F. Massaro, J. Quinn, A. Capetti, R. D. Baldi , et al. · 2021

We present a morphological and spectral study of a sample of 99 BL Lac objects using the LOFAR Two-Metre Sky Survey Second Data Release (LDR2). Extended emission has been identified at gigahertz frequencies around BL Lac objects, but with …

Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline Open

L. K. Morabito, N. Jackson, S. Mooney, Frits Sweijen, Shruti Badole , et al. · 2021

[abridged] The International LOFAR Telescope is an interferometer with stations spread across Europe. With baselines of up to ~2,000 km, LOFAR has the unique capability of achieving sub-arcsecond resolution at frequencies below 200 MHz, al…

Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey Open

N. Jackson, Shruti Badole, John Morgan, Rajan Chhetri, K. Prūsis , et al. · 2021

The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In this paper we present the complete survey, building on the …

Sub-arcsecond imaging with the International LOFAR Telescope Open

N. Jackson, Shruti Badole, John Morgan, R. Chhetri, K. Prūsis , et al. · 2021

The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In this paper, we present the complete survey, building on the…

Sub-arcsecond imaging with the International LOFAR Telescope Open

L. K. Morabito, N. Jackson, S. Mooney, Frits Sweijen, Shruti Badole , et al. · 2021

The International LOFAR Telescope is an interferometer with stations spread across Europe. With baselines of up to ~2000 km, LOFAR has the unique capability of achieving sub-arcsecond resolution at frequencies below 200 MHz. However, it is…

The Evolutionary Map of the Universe pilot survey Open

R. P. Norris, Joshua Marvil, J. D. Collier, A. D. Kapińska, Andrew O’Brien , et al. · 2021

We present the data and initial results from the first pilot survey of the Evolutionary Map of the Universe (EMU), observed at 944 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The survey covers $270 \,\mathr…

Molecular gas in CLASH brightest cluster galaxies at z ∼ 0.2 – 0.9 Open

G. Castignani, M. Pandey-Pommier, S. Hamer, F. Combes, P. Salomé , et al. · 2020

Brightest cluster galaxies (BCGs) are excellent laboratories for the study of galaxy evolution in dense Mpc-scale environments. We used the IRAM-30 m to observe, in CO(1→0), CO(2→1), CO(3→2), or CO(4→3), 18 BCGs at z ∼ 0.2 − 0.9 drawn from…

LOFAR 144-MHz follow-up observations of GW170817 Open

J. W. Broderick, T. W. Shimwell, K. Gourdji, A. Rowlinson, S. Nissanke , et al. · 2020

We present low-radio-frequency follow-up observations of AT 2017gfo, the electromagnetic counterpart of GW170817, which was the first binary neutron star merger to be detected by Advanced LIGO–Virgo. These data, with a central frequency of…

Cassiopeia A, Cygnus A, Taurus A, and Virgo A at ultra-low radio frequencies Open

F. de Gasperin, Jacco Vink, J. P. McKean, A. Asgekar, I. M. Avruch , et al. · 2020

Context. The four persistent radio sources in the northern sky with the highest flux density at metre wavelengths are Cassiopeia A, Cygnus A, Taurus A, and Virgo A; collectively they are called the A-team. Their flux densities at ultra-low…

Exploration of the Potential of the Radio-Detection Technique for the Detection of High-Energy Gamma Rays Open

H.-P. Dembinski, L. Bondonneau, A. Coffre, S. Corbel, Laurent Denis , et al. · 2019

International audience

Needle-like structures discovered on positively charged lightning branches Open

B. M. Hare, O. Schölten, J. R. Dwyer, T. N. G. Trinh, S. Buitink , et al. · 2019

Low-frequency radio absorption in Cassiopeia A Open

M. Arias, Jacco Vink, F. de Gasperin, P. Salas, J. B. R. Oonk , et al. · 2018

Context. Cassiopeia A is one of the best-studied supernova remnants. Its bright radio and X-ray emission is due to shocked ejecta. Cas A is rather unique in that the unshocked ejecta can also be studied: through emission in the infrared, t…

Cas A LOFAR and VLA images Open

M. Arias, Fiamma Capitanio, F. de Gasperin, P.F. de Salas, J. B. R. Oonk , et al. · 2018

LOFAR LBA and VLA L-band images of supernova remnant Cassiopeia A. Data taken in 2015 (LOFAR) and 2017 (VLA). - VLA_lband2017.fits: images made from one night (August 13th) combining the two available continuum spectral windows (…

Tracking of an electron beam through the solar corona with LOFAR Open

G. Mann, F. Breitling, C. Vocks, H. Auraß, Matthias Steinmetz , et al. · 2017

The Sun’s activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in dynamic radio spe…

The association of aJ-burst with a solar jet Open

D. E. Morosan, P. T. Gallagher, R. A. Fallows, Hamish Reid, G. Mann , et al. · 2017

\n Contains fulltext :\n 178482.pdf (Publisher’s version ) (Open Access)\n

The Association of a J-burst with a Solar Jet Open

D. E. Morosan, P. T. Gallagher, R. A. Fallows, Hamish Reid, G. Mann , et al. · 2017

Context. The Sun is an active star that produces large-scale energetic events such as solar flares and coronal mass ejections and numerous smaller-scale events such as solar jets. These events are often associated with accelerated particle…

‘Zwicky's Nonet’: a compact merging ensemble of nine galaxies and 4C 35.06, a peculiar radio galaxy with dancing radio jets Open

K. G. Biju, J. Bagchi, C. H. Ishwara‐Chandra, M. Pandey-Pommier, Joe Jacob , et al. · 2017

We report the results of our radio, optical and infrared studies of a peculiar radio source 4C 35.06, an extended radio-loud active galactic nucleus (AGN) at the centre of galaxy cluster Abell 407 (z = 0.047). The central region of this cl…

LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group Open

A. O. Clarke, G. Heald, T. H. Jarrett, Justin D. Bray, M. J. Hardcastle , et al. · 2017

\n Contains fulltext :\n 173529.pdf (Author’s version preprint ) (Open Access)\n

Discovery of giant radio galaxies from NVSS: radio and infrared properties Open

Pratik Dabhade, Madhuri Gaikwad, J. Bagchi, M. Pandey-Pommier, Shishir Sankhyayan , et al. · 2017

Giant radio galaxies (GRGs) are one of the largest astrophysical sources in the Universe with an overall projected linear size of ∼0.7 Mpc or more. The last six decades of radio astronomy research has led to the detection of thousands of r…

LOFAR Bootes and 3C295 field sources Open

R. J. van Weeren, W. L. Williams, C. Tasse, H. J. A. Röttgering, D. A. Rafferty , et al. · 2017

Non-thermal emission and dynamical state of massive galaxy clusters from CLASH sample Open

M. Pandey-Pommier, Johan Richard, F. Combes, A. C. Edge, B. Guiderdoni , et al. · 2016

Massive galaxy clusters are the most violent large scale structures undergoing merger events in the Universe. Based upon their morphological properties in X-rays, they are classified as un-relaxed and relaxed clusters and often host (a fra…

The WEAVE-LOFAR Survey Open

D. J. B. Smith, P. N. Best, K. J. Duncan, N. A. Hatch, M. J. Jarvis , et al. · 2016

In these proceedings we highlight the primary scientific goals and design of the WEAVE-LOFAR survey, which will use the new WEAVE spectrograph on the 4.2m William Herschel Telescope to provide the primary source of spectroscopic informatio…

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