Publications (27)
Evolutionary phases of merging clusters as seen by LOFAR
Amanda Wilber, Marcus Brüggen, Annalisa Bonafede +13
Massive, merging galaxy clusters often host giant, diffuse radio sources that arise from shocks and turbulence; hence, radio observations can be useful for determining the merger s…
A shock front at the radio relic of Abell 2744
Dominique Eckert, Mathilde Jauzac, Franco Vazza +5
Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxy clusters which are thought to trace outgoing merger shocks. We present XMM-Newton and Suzaku observati…
Average radio spectral energy distribution of highly star-forming galaxies
KreÅ¡imir TisaniÄ, Vernesa SmolÄiÄ, Jacinta Delhaize +5
The infrared-radio correlation (IRRC) offers a way to assess star formation from radio emission. Multiple studies found the IRRC to decrease with increasing redshift. This may in p…
Detailed study of ELAIS N1 field with the uGMRT -- II. Source Properties and Spectral Variation Of Foreground Power Spectrum from 300-500 MHz Observations
Arnab Chakraborty, Nirupam Roy, Abhirup Datta +8
Understanding the low-frequency radio sky in depth is necessary to subtract foregrounds in order to detect the redshifted 21 cm signal of neutral hydrogen from the Cosmic Dawn, Epo…
Measurements of the Sunyaev-Zel'dovich Effect in MACS J0647.7+7015 and MACS J1206.2-0847 at High Angular Resolution with MUSTANG
Alexander H. Young, Tony Mroczkowski, Charles Romero +18
We present high resolution (9) imaging of the Sunyaev-Zel'dovich Effect (SZE) toward two massive galaxy clusters, MACS J0647.7+7015 () and MACS J1206.2-0…
The case of 3C326: VLA 74 MHz observations during a geomagnetic storm
Emanuela Orrú, Huib Intema
Reaching the thermal noise at low frequencies with the next generation of instruments (e.g. SKA, LOFAR etc.) is going to be a challenge. It requires the development of more advance…
Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies
Martin W. Sommer, Kaustuv Basu, Huib Intema +4
Radio halos are diffuse synchrotron sources on scales of ~1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by the me…
Advanced spectral analysis of ionospheric waves observed with sparse arrays
Joseph Helmboldt, Huib Intema
This paper presents a case study from a single, six-hour observing period to illustrate the application of techniques developed for interferometric radio telescopes to the spectral…
The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430
Tony Mroczkowski, Megan Donahue, Joshiwa van Marrewijk +8
We present a multiwavelength study of RXC J2014.8-2430, the most extreme cool-core cluster in the Representative Cluster Structure Survey (REXCESS), using X-…
The Complete Local Volume Groups Sample -- III. Characteristics of group central radio galaxies in the Local Universe
Konstantinos Kolokythas, Ewan O'Sullivan, Huib Intema +4
Using new 610 MHz and 235 MHz observations from the Giant Metrewave Radio Telescope (GMRT) in combination with archival GMRT and Very Large Array (VLA) survey data we present the r…
A LOFAR study of non-merging massive galaxy clusters
Federica Savini, Annalisa Bonafede, Marcus Brueggen +15
Centrally located diffuse radio emission has been observed in both merging and non-merging galaxy clusters. Depending on their morphology and size, we distinguish between giant rad…
GMRT Archive Processing Project
Shubhankar Deshpande, Yogesh Wadadekar, Huib Intema +7
The GMRT Online Archive now houses over 120 terabytes of interferometric observations obtained with the GMRT since the observatory began operating as a facility in 2002. The utilit…
The XXL Survey: XXIX. GMRT 610 MHz continuum observations
Vernesa Smolcic, Huib Intema, Bruno Slaus +18
We present the 25 square-degree GMRT-XXL-N 610 MHz radio continuum survey, conducted at 50~cm wavelength with the Giant Metrewave Radio Telescope (GMRT) towards the XXL Northern fi…
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog
Paula Benaglia, C. H. Ishwara-Chandra, Huib Intema +2
Context: Observations at the radio continuum band below the gigahertz band are key when the nature and properties of nonthermal sources are investigated because their radio radiati…
Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555-2908
Paul S. Ray, Lars Nieder, Colin J. Clark +21
We report the discovery of PSR J1555-2908, a 1.79 ms radio and gamma-ray pulsar in a 5.6 hr binary system with a minimum companion mass of 0.052 . This fast and energetic…
Very Large Array Observations of Disturbed Ion Flow from the Plasmasphere to the Nighttime Ionosphere
Joseph Helmboldt, Huib Intema
We present the results of a multi-scale analysis of TEC fluctuations using a roughly five-hour observation of the bright radio source Virgo A with the Very Large Array (VLA) at 74…
Diffuse radio source candidate in CIZA J1358.9-4750
Kohei Kurahara, Takuya Akahori, Ruta Kale +11
We report on results of our upgraded Giant Metrewave Radio Telescope (uGMRT) observations for an early-stage merging galaxy cluster, CIZA J1358.9-4750 (CIZA1359), in Band-3 (300--5…
ATCA observations of the MACS-Planck Radio Halo Cluster Project - I. New detection of a radio halo in PLCK G285.0-23.7
Gerardo Martinez Aviles, Chiara Ferrari, Melanie Johnston-Hollitt +12
We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z=0.39, M_500 = 8.39 x 10^(14) M_Sun). Our 16cm-band…
Detailed study of the ELAIS N1 field with the uGMRT - I. Characterizing the 325 MHz foreground for redshifted 21 cm observations
Arnab Chakraborty, Abhirup Datta, Samir Choudhuri +8
In this first paper of the series, we present initial results of newly upgraded Giant Meterwave Radio Telescope (uGMRT) observation of European Large-Area ISO Survey-North 1 (ELAIS…
Spectroscopic Confirmation of an Ultra Massive and Compact Galaxy at z=3.35: A Detailed Look at an Early Progenitor of Local Most Massive Ellipticals
Z. Cemile Marsan, Danilo Marchesini, Gabriel B. Brammer +10
We present the first spectroscopic confirmation of an ultra-massive galaxy at redshift z>3 using data from Keck-NIRSPEC, VLT-Xshooter, and GTC-Osiris. We detect strong [OIII] and L…
The Curious Case of Abell 2256
Tracy E. Clarke, Torsten EnÃlin, Alexis Finoguenov +5
Abell 2256 is a rich, nearby (z=0.0594) galaxy cluster that has significant evidence of merger activity. We present new radio and X-ray observations of this system. The low-frequen…
ASKAP reveals giant radio halos in two merging SPT galaxy clusters -- Making the case for a direction-dependent pipeline --
Amanda G. Wilber, Melanie Johnston-Hollitt, Stefan W. Duchesne +4
Early science observations from the Australian Square Kilometre Array Pathfinder (ASKAP) have revealed clear signals of diffuse radio emission associated with two clusters detected…
First evidence of diffuse ultra-steep-spectrum radio emission surrounding the cool core of a cluster
Federica Savini, Annalisa Bonafede, Marcus Brueggen +14
Diffuse synchrotron radio emission from cosmic-ray electrons is observed at the center of a number of galaxy clusters. These sources can be classified either as giant radio halos,…
Evidence of AGN feedback and sloshing in the X-ray luminous NGC 1550 galaxy group
Konstantinos Kolokythas, Ewan O'Sullivan, Simona Giacintucci +6
We present results from GMRT and Chandra observations of the NGC 1550 galaxy group. Although previously thought of as relaxed, we show evidence that gas sloshing and active galacti…
GMRT 610 MHz observations of galaxy clusters in the ACT equatorial sample
Kenda Knowles, Andrew J. Baker, J. Richard Bond +11
We present Giant Metrewave Radio Telescope 610 MHz observations of 14 Atacama Cosmology Telescope (ACT) clusters, including new data for nine. The sample includes 73\% of ACT equat…
A study of diffuse radio sources and X-ray emission in six massive clusters
Viral Parekh, K. S. Dwarakanath, Ruta Kale +1
The goal of the present study is to extend our current knowledge of the diffuse radio source (halo and relic) populations to 0.3. Here we report GMRT and EVLA radio observa…
Megahertz emission of massive early-type stars in the Cygnus region
Paula Benaglia, Michäel De Becker, C. H. Ishwara-Chandra +2
Massive, early type stars have been detected as radio sources for many decades. Their thermal winds radiate free-free continuum and in binary systems hosting a colliding-wind regio…