Outputs (14)

Unmasking the history of 3C 293 with LOFAR sub‐arcsecond imaging (2021)
Presentation / Conference Contribution
Kukreti, P., Morganti, R., Shimwell, T. W., Morabito, L. K., Beswick, R. J., Brienza, M., …Gasperin, F. D. (2021). Unmasking the history of 3C 293 with LOFAR sub‐arcsecond imaging. . https://doi.org/10.1002/asna.20210107

Active galactic nuclei show episodic activity, which can be evident in galaxies that exhibit restarted radio jets. These restarted jets can interact with their environment, leaving signatures in the radio spectral energy distribution. Tracing these s... Read More about Unmasking the history of 3C 293 with LOFAR sub‐arcsecond imaging.

Spectral analysis of spatially resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope (2021)
Journal Article
Bonnassieux, E., Sweijen, F., Brienza, M., Rajpurohit, K., Riseley, C., Bonafede, A., …van Weeren, R. (2022). Spectral analysis of spatially resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope. Astronomy & Astrophysics, 658, Article A10. https://doi.org/10.1051/0004-6361/202141731

3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectral studies have been limited due to a lack of high resolution images at... Read More about Spectral analysis of spatially resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope.

High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434 (2021)
Journal Article
Badole, S., Venkattu, D., Jackson, N., Wallace, S., Dhandha, J., Hartley, P., …McKean, J. (2022). High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434. Astronomy & Astrophysics, 658, Article A7. https://doi.org/10.1051/0004-6361/202141227

We present Low-Frequency Array (LOFAR) telescope observations of the radio-loud gravitational lens systems MG 0751+2716 and CLASS B1600+434. These observations produce images at 300 milliarcseconds (mas) resolution at 150 MHz. In the case of MG 0751+... Read More about High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434.

Unmasking the history of 3C 293 with LOFAR sub-arcsecond imaging (2021)
Journal Article
Kukreti, P., Morganti, R., Shimwell, T., Morabito, L., Beswick, R., Brienza, M., …de Gasperin, F. (2022). Unmasking the history of 3C 293 with LOFAR sub-arcsecond imaging. Astronomy & Astrophysics, 658, Article A6. https://doi.org/10.1051/0004-6361/202140814

Active galactic nuclei (AGNs) show episodic activity, which can be evident in galaxies that exhibit restarted radio jets. These restarted jets can interact with their environment, leaving signatures on the radio spectral energy distribution. Tracing... Read More about Unmasking the history of 3C 293 with LOFAR sub-arcsecond imaging.

The radio loudness of SDSS quasars from the LOFAR Two-metre Sky Survey: ubiquitous jet activity and constraints on star formation (2021)
Journal Article
Macfarlane, C., Best, P., Sabater, J., Gürkan, G., Jarvis, M., Röttgering, H., …Retana-Montenegro, E. (2021). The radio loudness of SDSS quasars from the LOFAR Two-metre Sky Survey: ubiquitous jet activity and constraints on star formation. Monthly Notices of the Royal Astronomical Society, 506(4), 5888-5907. https://doi.org/10.1093/mnras/stab1998

Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN (2021)
Journal Article
Rosario, D., Alexander, D., Moldon, J., Klindt, L., Thomson, A., Morabito, L., …Harrison, C. (2021). Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN. Monthly Notices of the Royal Astronomical Society, 505(4), 5283-5300. https://doi.org/10.1093/mnras/stab1653

Red quasi-stellar objects (QSOs) are a subset of the quasar population with colours consistent with reddening due to intervening dust. Recent work has demonstrated that red QSOs show special radio properties that fundamentally distinguish them from n... Read More about Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN.

Sub-arcsecond imaging with the International LOFAR Telescope II. Completion of the LOFAR Long-Baseline Calibrator Survey (2021)
Journal Article
Jackson, N., Badole, S., Morgan, J., Chhetri, R., Prūsis, K., Nikolajevs, A., …Zucca, P. (2022). Sub-arcsecond imaging with the International LOFAR Telescope II. Completion of the LOFAR Long-Baseline Calibrator Survey. Astronomy & Astrophysics, 658, Article A2. https://doi.org/10.1051/0004-6361/202140756

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 preliminar... Read More about Sub-arcsecond imaging with the International LOFAR Telescope II. Completion of the LOFAR Long-Baseline Calibrator Survey.

The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening (2021)
Journal Article
Calistro Rivera, G., Alexander, D., Rosario, D., Harrison, C., Stalevski, M., Rakshit, S., …Kondapally, R. (2021). The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening. Astronomy & Astrophysics, 649, Article A102. https://doi.org/10.1051/0004-6361/202040214

Fundamental differences in the radio properties of red quasars (QSOs), as compared to blue QSOs, have been recently discovered, positioning them as a potential key population in the evolution of galaxies and black holes across cosmic time. To elucida... Read More about The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening.

The LOFAR LBA Sky Survey: I. Survey description and preliminary data release (2021)
Journal Article
de Gasperin, F., Williams, W., Best, P., Brüggen, M., Brunetti, G., Cuciti, V., …Röttgering, H. (2021). The LOFAR LBA Sky Survey: I. Survey description and preliminary data release. Astronomy & Astrophysics, 648, Article A104. https://doi.org/10.1051/0004-6361/202140316

Context. The LOw Frequency ARray (LOFAR) is the only radio telescope that is presently capable of high-sensitivity, high-resolution (i.e. < 1 mJy beam−1 and < 15″) observations at ultra-low frequencies (< 100 MHz). To utilise these capabilities, the... Read More about The LOFAR LBA Sky Survey: I. Survey description and preliminary data release.

The LOFAR Two-metre Sky Survey Deep Fields -- Data Release 1: IV. Photometric redshifts and stellar masses (2021)
Journal Article
Duncan, K., Kondapally, R., Brown, M., Bonato, M., Best, P., Röttgering, H., …Wołowska, A. (2021). The LOFAR Two-metre Sky Survey Deep Fields -- Data Release 1: IV. Photometric redshifts and stellar masses. Astronomy & Astrophysics, 648, Article A4. https://doi.org/10.1051/0004-6361/202038809

The Low Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120-168 MHz survey split across multiple tiers over the northern sky. The first LoTSS Deep Fields data release consists of deep radio continuum imaging at 15... Read More about The LOFAR Two-metre Sky Survey Deep Fields -- Data Release 1: IV. Photometric redshifts and stellar masses.

The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging (2021)
Journal Article
Tasse, C., Shimwell, T., Hardcastle, M., O'Sullivan, S., van Weeren, R., Best, P., …Wiaux, Y. (2021). The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging. Astronomy & Astrophysics, 648, Article A1. https://doi.org/10.1051/0004-6361/202038804

The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic surveys. It has a large field of view and is sensitive to large-scale and compact emission. It is, however, very challenging to synthesize thermal noise limited maps... Read More about The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging.

Placing LOFAR-detected quasars in C iv emission space: implications for winds, jets and star formation (2021)
Journal Article
Rankine, A. L., Matthews, J. H., Hewett, P. C., Banerji, M., Morabito, L. K., & Richards, G. T. (2021). Placing LOFAR-detected quasars in C iv emission space: implications for winds, jets and star formation. Monthly Notices of the Royal Astronomical Society, 502(3), 4154-4169. https://doi.org/10.1093/mnras/stab302

We present an investigation of the low-frequency radio and ultraviolet properties of a sample of ≃10 500 quasars from the Sloan Digital Sky Survey Data Release 14, observed as part of the first data release of the Low-Frequency-Array Two-metre Sky Su... Read More about Placing LOFAR-detected quasars in C iv emission space: implications for winds, jets and star formation.

Extended X-ray emission around FR II radio galaxies: hotspots, lobes and galaxy clusters (2021)
Journal Article
Jimenez-Gallardo, A., Massaro, F., Paggi, A., D'Abrusco, R., Prieto, M. A., Peña-Herazo, H. A., …Morabito, L. K. (2021). Extended X-ray emission around FR II radio galaxies: hotspots, lobes and galaxy clusters. Astrophysical Journal Supplement, 252(2), Article 31. https://doi.org/10.3847/1538-4365/abcecd

We present a systematic analysis of the extended X-ray emission discovered around 35 FR II radio galaxies from the revised Third Cambridge catalog (3CR) Chandra Snapshot Survey with redshifts between 0.05 to 0.9. We aimed to (i) test for the presence... Read More about Extended X-ray emission around FR II radio galaxies: hotspots, lobes and galaxy clusters.

Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline (2021)
Journal Article
Morabito, L., Jackson, N., Mooney, S., Sweijen, F., Badole, S., Kukreti, P., …Zucca, P. (2021). Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline. Astronomy & Astrophysics, 658, Article A1. https://doi.org/10.1051/0004-6361/202140649

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 technicall... Read More about Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline.