Professor Leah Morabito's Outputs (16)

Measuring cavity powers of active galactic nuclei in clusters using a hybrid X-ray–radio method. A new window on feedback opened by subarcsecond LOFAR-VLBI observations (2022)
Journal Article
Timmerman, R., van Weeren, R., Botteon, A., Röttgering, H., McNamara, B., Sweijen, F., Bîrzan, L., & Morabito, L. (2022). Measuring cavity powers of active galactic nuclei in clusters using a hybrid X-ray–radio method. A new window on feedback opened by subarcsecond LOFAR-VLBI observations. Astronomy & Astrophysics, 668, Article A65. https://doi.org/10.1051/0004-6361/202243936

Measurements of the quantity of radio-mode feedback injected by an active galactic nucleus into the cluster environment have mostly relied on X-ray observations, which reveal cavities in the intracluster medium excavated by the radio lobes. However,... Read More about Measuring cavity powers of active galactic nuclei in clusters using a hybrid X-ray–radio method. A new window on feedback opened by subarcsecond LOFAR-VLBI observations.

MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star-forming galaxies and active galactic nuclei (2022)
Journal Article
Hale, C., Whittam, I., Jarvis, M., Best, P., Thomas, N., Heywood, I., Prescott, M., Adams, N., Afonso, J., An, F., Bowler, R., Collier, J., Cook, R., Davé, R., Frank, B., Glowacki, M., Hatfield, P., Kolwa, S., Lovell, C., Maddox, N., …Taylor, A. (2023). MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star-forming galaxies and active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 520(2), 2668 - 2691. https://doi.org/10.1093/mnras/stac3320

We present deep 1.4 GHz source counts from ∼5 deg2 of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration survey down to S1.4GHz ∼15 μ Jy. Using observations over two extragalactic fields (... Read More about MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star-forming galaxies and active galactic nuclei.

A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems (2022)
Journal Article
Andonie, C., Alexander, D. M., Rosario, D., Laloux, B., Georgakakis, A., Morabito, L. K., Villforth, C., Avirett-Mackenzie, M., Rivera, G. C., Del Moro, A., Fotopoulou, S., Harrison, C., Lapi, A., Petley, J., Petter, G., & Shankar, F. (2022). A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems. Monthly Notices of the Royal Astronomical Society, 517(2), 2577-2598. https://doi.org/10.1093/mnras/stac2800

To understand the active galactic nuclei (AGNs) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive mul... Read More about A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems.

MIGHTEE: the nature of the radio-loud AGN population (2022)
Journal Article
Whittam, I., Jarvis, M., Hale, C., Prescott, M., Morabito, L., Heywood, I., Adams, N., Afonso, J., An, F., Ao, Y., Bowler, R., Collier, J., Deane, R., Delhaize, J., Frank, B., Glowacki, M., Hatfield, P., Maddox, N., Marchetti, L., Matthews, A., …Vaccari, M. (2022). MIGHTEE: the nature of the radio-loud AGN population. Monthly Notices of the Royal Astronomical Society, 516(1), 245-263. https://doi.org/10.1093/mnras/stac2140

We study the nature of the faint radio source population detected in the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data in the COSMOS field, focusing on the properties of the radio-loud active galactic nuclei... Read More about MIGHTEE: the nature of the radio-loud AGN population.

Identifying active galactic nuclei via brightness temperature with sub-arcsecond international LOFAR Telescope observations (2022)
Journal Article
Morabito, L. K., Sweijen, F., Radcliffe, J., Best, P., Kondapally, R., Bondi, M., Bonato, M., Duncan, K., Prandoni, I., Shimwell, T., Williams, W., van Weeren, R., Conway, J., & Rivera, G. C. (2022). Identifying active galactic nuclei via brightness temperature with sub-arcsecond international LOFAR Telescope observations. Monthly Notices of the Royal Astronomical Society, 515(4), 5758-5774. https://doi.org/10.1093/mnras/stac2129

Identifying active galactic nuclei (AGNs) and isolating their contribution to a galaxy’s energy budget is crucial for studying the co-evolution of AGNs and their host galaxies. Brightness temperature (Tb) measurements from high-resolution radio obser... Read More about Identifying active galactic nuclei via brightness temperature with sub-arcsecond international LOFAR Telescope observations.

Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273 (2022)
Journal Article
Kukreti, P., Morganti, R., Bondi, M., Oosterloo, T., Tadhunter, C., Morabito, L. K., Adams, E., Adebahr, B., de Blok, W., de Gasperin, F., Drabent, A., Hess, K., Ivashina, M., Kutkin, A., Mika, Á. M., Oostrum, L., Shimwell, T., van der Hulst, J., van Leeuwen, J., van Weeren, R., …Ziemke, J. (2022). Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273. Astronomy & Astrophysics, 664, Article A25. https://doi.org/10.1051/0004-6361/202243174

Galaxy mergers have been observed to trigger nuclear activity by feeding gas to the central supermassive black hole. One such class of objects are Ultra Luminous InfraRed Galaxies (ULIRGs), which are mostly late stage major mergers of gas-rich galaxi... Read More about Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273.

Connecting radio emission to AGN wind properties with Broad Absorption Line Quasars (2022)
Journal Article
Petley, J., Morabito, L., Alexander, D., Rankine, A., Fawcett, V., Rosario, D., Matthews, J., Shimwell, T., & Drabent, A. (2022). Connecting radio emission to AGN wind properties with Broad Absorption Line Quasars. Monthly Notices of the Royal Astronomical Society, 515(4), 5159-5174. https://doi.org/10.1093/mnras/stac2067

Broad Absorption Line Quasars (BALQSOs) show strong signatures of powerful outflows, with the potential to alter the cosmic history of their host galaxies. These signatures are only seen in ∼10% of optically selected quasars, although the fraction si... Read More about Connecting radio emission to AGN wind properties with Broad Absorption Line Quasars.

Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope (2022)
Journal Article
Kappes, A., Burd, P., Kadler, M., Ghisellini, G., Perucho, M., Brüggen, M., Cheung, C., Ciardi, B., Gallo, E., Haardt, F., Morabito, L., Sbarrato, T., Bonnassieux, E., Drabent, A., Harwood, J., Jackson, N., & Moldon, J. (2022). Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope. Astronomy & Astrophysics, 663, Article A44. https://doi.org/10.1051/0004-6361/202141720

Context. Studies of the most distant active galactic nuclei (AGNs) allow us to test our current understanding of the physics present in radio-jetted AGNs across a range of environments, and probe their interactions with these environments. The decrea... Read More about Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope.

Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter (2022)
Journal Article
Fawcett, V., Alexander, D., Rosario, D., Klindt, L., Lusso, E., Morabito, L., & Calistro Rivera, G. (2022). Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter. Monthly Notices of the Royal Astronomical Society, 513(1), 1254-1274. https://doi.org/10.1093/mnras/stac945

We have recently found fundamental differences in the radio properties of red quasars when compared to typical blue quasars. In this paper, we use data from the X-shooter spectrograph on the Very Large Telescope, providing spectral coverage from ∼300... Read More about Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter.

The LOFAR Two-metre Sky Survey (2022)
Journal Article
Shimwell, T., Hardcastle, M., Tasse, C., Best, P., Röttgering, H., Williams, W., Botteon, A., Drabent, A., Mechev, A., Shulevski, A., van Weeren, R., Bester, L., Brüggen, M., Brunetti, G., Callingham, J., Chyży, K., Conway, J., Dijkema, T., Duncan, K., de Gasperin, F., …Zheng, J. (2022). The LOFAR Two-metre Sky Survey. Astronomy & Astrophysics, 659, Article A1. https://doi.org/10.1051/0004-6361/202142484

In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120–168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44◦300 and 1h00m +28◦000 an... Read More about The LOFAR Two-metre Sky Survey.

Deep sub-arcsecond wide-field imaging of the Lockman Hole field at 144 MHz (2022)
Journal Article
Sweijen, F., van Weeren, R., Röttgering, H., Morabito, L., Jackson, N., Offringa, A., van der Tol, S., Veenboer, B., Oonk, J., Best, P., Bondi, M., Shimwell, T., Tasse, C., & Thomson, A. (2022). Deep sub-arcsecond wide-field imaging of the Lockman Hole field at 144 MHz. Nature Astronomy, 6(3), 350-356. https://doi.org/10.1038/s41550-021-01573-z

Recent observations of the radio sky show that the vast majority of sources detected at 144 MHz are unresolved at the typical resolution of a few arcseconds1, demonstrating the need for sub-arcsecond-resolution surveys to make detailed studies. At lo... Read More about Deep sub-arcsecond wide-field imaging of the Lockman Hole field at 144 MHz.

Pushing sub-arcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope (2022)
Journal Article
Groeneveld, C., van Weeren, R., Miley, G., Morabito, L., de Gasperin, F., Callingham, J., Sweijen, F., Brüggen, M., Botteon, A., Offringa, A., Brunetti, G., Moldon, J., Bondi, M., Kappes, A., & Röttgering, H. (2022). Pushing sub-arcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope. Astronomy & Astrophysics, 658, Article A9. https://doi.org/10.1051/0004-6361/202141352

Relatively little information is available about the Universe at ultra-low radio frequencies (ULF; i.e., below 50 MHz), although the ULF spectral window contains a wealth of unique diagnostics for studying galactic and extragalactic phenomena. Subarc... Read More about Pushing sub-arcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope.

The resolved jet of 3C 273 at 150 MHz: Sub-arcsecond imaging with the LOFAR international baselines (2022)
Journal Article
Harwood, J., Mooney, S., Morabito, L., Quinn, J., Sweijen, F., Groeneveld, C., Bonnassieux, E., Kappes, A., & Moldon, J. (2022). The resolved jet of 3C 273 at 150 MHz: Sub-arcsecond imaging with the LOFAR international baselines. Astronomy & Astrophysics, 658, Article A8. https://doi.org/10.1051/0004-6361/202141579

Context. Since its discovery in 1963, 3C 273 has become one of the most widely studied quasars with investigations spanning the electromagnetic spectrum. While much has therefore been discovered about this historically notable source, its low-frequen... Read More about The resolved jet of 3C 273 at 150 MHz: Sub-arcsecond imaging with the LOFAR international baselines.

High-resolution international LOFAR observations of 4C 43.15. Spectral ages and injection indices in a high-z radio galaxy (2022)
Journal Article
Sweijen, F., Morabito, L., Harwood, J., van Weeren, R., Röttgering, H., Callingham, J., Jackson, N., Miley, G., & Moldon, J. (2022). High-resolution international LOFAR observations of 4C 43.15. Spectral ages and injection indices in a high-z radio galaxy. Astronomy & Astrophysics, 658, Article A3. https://doi.org/10.1051/0004-6361/202039871

It has long been known that radio sources with the steepest spectra are preferentially associated with the most distant galaxies, the α − z relation, but the reason for this relation is an open question. The spatial distribution of spectra in high-z... Read More about High-resolution international LOFAR observations of 4C 43.15. Spectral ages and injection indices in a high-z radio galaxy.

Origin of the ring structures in Hercules A. Sub-arcsecond 144 MHz to 7 GHz observations (2022)
Journal Article
Timmerman, R., van Weeren, R., Callingham, J., Cotton, W., Perley, R., Morabito, L., Gizani, N., Bridle, A., O'Dea, C., Baum, S., Tremblay, G., Kharb, P., Kassim, N., Röttgering, H., Botteon, A., Sweijen, F., Tasse, C., Brüggen, M., Moldon, J., Shimwell, T., & Brunetti, G. (2022). Origin of the ring structures in Hercules A. Sub-arcsecond 144 MHz to 7 GHz observations. Astronomy & Astrophysics, 658, Article A5. https://doi.org/10.1051/0004-6361/202140880

The prominent radio source Hercules A features complex structures in its radio lobes. Although it is one of the most comprehensively studied sources in the radio sky, the origin of the ring structures in the Hercules A radio lobes remains an open que... Read More about Origin of the ring structures in Hercules A. Sub-arcsecond 144 MHz to 7 GHz observations.

Sub-arcsecond imaging with the International LOFAR Telescope (2022)
Journal Article
Jackson, N., Badole, S., Morgan, J., Chhetri, R., Prūsis, K., Nikolajevs, A., Morabito, L., Brentjens, M., Sweijen, F., Iacobelli, M., Orrù, E., Sluman, J., Blaauw, R., Mulder, H., van Dijk, P., Mooney, S., Deller, A., Moldon, J., Callingham, J., Harwood, J., …Zucca, P. (2022). Sub-arcsecond imaging with the International LOFAR Telescope. Astronomy & Astrophysics, 658, Article A2. 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.