Skip to main content

Research Repository

Advanced Search

Professor Alastair Edge's Outputs (335)

Does absorption against AGN reveal supermassive black hole accretion? (2022)
Journal Article
Rose, T., McNamara, B., Combes, F., Edge, A., Fabian, A., Gaspari, M., Russell, H., Salomé, P., Tremblay, G., & Ferland, G. (2023). Does absorption against AGN reveal supermassive black hole accretion?. Monthly Notices of the Royal Astronomical Society, 518(1), 878 - 892. https://doi.org/10.1093/mnras/stac3194

Galaxies often contain large reservoirs of molecular gas that shape their evolution. This can be through cooling of the gas – which leads to star formation, or accretion on to the central supermassive black hole – which fuels active galactic nucleus... Read More about Does absorption against AGN reveal supermassive black hole accretion?.

Molecular Flows in Contemporary Active Galaxies and the Efficacy of Radio-Mechanical Feedback (2022)
Journal Article
Tamhane, P. D., McNamara, B. R., Russell, H. R., Edge, A. C., Fabian, A. C., Nulsen, P. E., & Babyk, I. V. (2022). Molecular Flows in Contemporary Active Galaxies and the Efficacy of Radio-Mechanical Feedback. Monthly Notices of the Royal Astronomical Society, 516(1), https://doi.org/10.1093/mnras/stac2168

Molecular gas flows are analysed in 14 cluster galaxies (BCGs) centred in cooling hot atmospheres. The BCGs contain 109−1011 M⊙ of molecular gas, much of which is being moved by radio jets and lobes. The molecular flows and radio jet powers are compa... Read More about Molecular Flows in Contemporary Active Galaxies and the Efficacy of Radio-Mechanical Feedback.

Circumnuclear Medium around the Central AGN in a Cool-core Cluster, Abell 1644-South (2022)
Journal Article
Baek, J., Chung, A., Edge, A., Rose, T., Kim, J.-W., & Jung, T. (2022). Circumnuclear Medium around the Central AGN in a Cool-core Cluster, Abell 1644-South. Astrophysical Journal, 932(1), Article 64. https://doi.org/10.3847/1538-4357/ac6de6

We present the circumnuclear multiphase gas properties of the brightest cluster galaxy (BCG) in the center of Abell 1644-South (A1644-S). A1644-S is the main cluster in a merging system, which is well known for X-ray hot gas sloshing in its core. The... Read More about Circumnuclear Medium around the Central AGN in a Cool-core Cluster, Abell 1644-South.

Pilot-WINGS: An extended MUSE view of the structure of Abell 370 (2022)
Journal Article
Lagattuta, D. J., Richard, J., Bauer, F. E., Cerny, C., Claeyssens, A., Guaita, L., Jauzac, M., Jeanneau, A., Koekemoer, A. M., Mahler, G., Prieto Lyon, G., Acebron, A., Meneghetti, M., Niemiec, A., Zitrin, A., Bianconi, M., Connor, T., Cen, R., Edge, A., Faisst, A. L., …Weaver, J. R. (2022). Pilot-WINGS: An extended MUSE view of the structure of Abell 370. Monthly Notices of the Royal Astronomical Society, 514(1), 497-517. https://doi.org/10.1093/mnras/stac418

We investigate the strong-lensing cluster Abell 370 (A370) using a wide Integral Field Unit (IFU) spectroscopic mosaic from the Multi-Unit Spectroscopic Explorer (MUSE). IFU spectroscopy provides significant insight into the structure and mass conten... Read More about Pilot-WINGS: An extended MUSE view of the structure of Abell 370.

The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design (2022)
Journal Article
Allison, J. R., Sadler, E., Amaral, A., An, T., Curran, S., Darling, J., Edge, A., Ellison, S., Emig, K., Gaensler, B., Garratt-Smithson, L., Glowacki, M., Grasha, K., Koribalski, B., Lagos, C. D. P., Lah, P., Mahony, E., Mao, S., Morganti, R., Moss, V., …Zwaan, M. (2022). The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design. Publications of the Astronomical Society of Australia, 39, https://doi.org/10.1017/pasa.2022.3

A LOFAR view into the stormy environment of the galaxy cluster 2A0335+096 (2022)
Journal Article
Ignesti, A., Brunetti, G., Shimwell, T., Gitti, M., Birzan, L., Botteon, A., Brüggen, M., de Gasperin, F., Di Gennaro, G., Edge, A., Riseley, C., Röttgering, H., & van Weeren, R. (2022). A LOFAR view into the stormy environment of the galaxy cluster 2A0335+096. Astronomy & Astrophysics, 659, Article A20. https://doi.org/10.1051/0004-6361/202142549

Context. Radio observations represent a powerful probe of the physics occurring in the intracluster medium (ICM) because they trace the relativistic cosmic rays in the cluster magnetic fields, or within galaxies themselves. By probing the low-energy... Read More about A LOFAR view into the stormy environment of the galaxy cluster 2A0335+096.

Quasar feedback survey: multiphase outflows, turbulence, and evidence for feedback caused by low power radio jets inclined into the galaxy disc (2022)
Journal Article
Girdhar, A., Harrison, C., Mainieri, V., Bittner, A., Costa, T., Kharb, P., Mukherjee, D., Arrigoni Battaia, F., Alexander, D., Calistro Rivera, G., Circosta, C., De Breuck, C., Edge, A., Farina, E., Kakkad, D., Lansbury, G., Molyneux, S., Mullaney, J., S, S., Thomson, A., & Ward, S. (2022). Quasar feedback survey: multiphase outflows, turbulence, and evidence for feedback caused by low power radio jets inclined into the galaxy disc. Monthly Notices of the Royal Astronomical Society, 512(2), 1608-1628. https://doi.org/10.1093/mnras/stac073

We present a study of a luminous, z = 0.15, type-2 quasar (L[OIII] = 1042.8 erg s−1) from the Quasar Feedback Survey. It is classified as ‘radio-quiet’ (L1.4 GHz = 1023.8 W Hz−1); however, radio imaging reveals ∼ 1 kpc low-power radio jets (Pjet = 10... Read More about Quasar feedback survey: multiphase outflows, turbulence, and evidence for feedback caused by low power radio jets inclined into the galaxy disc.

The variability of brightest cluster galaxies at high radio frequencies (2021)
Journal Article
Rose, T., Edge, A., Kiehlmann, S., Baek, J., Chung, A., Jung, T.-H., Kim, J.-W., Readhead, A. C., & Sedgewick, A. (2022). The variability of brightest cluster galaxies at high radio frequencies. Monthly Notices of the Royal Astronomical Society, 509(2), 2869-2884. https://doi.org/10.1093/mnras/stab3217

Variability of a galaxy’s core radio source can be a significant consequence of active galactic nucleus accretion. However, this variability has not been well studied, particularly at high radio frequencies. As such, we report on a campaign monitorin... Read More about The variability of brightest cluster galaxies at high radio frequencies.

The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz (2021)
Journal Article
Biava, N., de Gasperin, F., Bonafede, A., Edler, H., Giacintucci, S., Mazzotta, P., Brunetti, G., Botteon, A., Brüggen, M., Cassano, R., Drabent, A., Edge, A., Enßlin, T., Gastaldello, F., Riseley, C., Rossetti, M., Rottgering, H., Shimwell, T., Tasse, C., & van Weeren, R. (2021). The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz. Monthly Notices of the Royal Astronomical Society, 508(3), 3995-4007. https://doi.org/10.1093/mnras/stab2840

Diffuse radio emission at the centre of galaxy clusters has been observed both in merging clusters on scales of Mpc, called giant radio haloes, and in relaxed systems with a cool-core on smaller scales, named mini haloes. Giant radio haloes and mini... Read More about The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz.

An extreme case of galaxy and cluster co-evolution at z  = 0.7 (2021)
Journal Article
Ebeling, H., Richard, J., Smail, I., Edge, A., Koekemoer, A., & Zalesky, L. (2021). An extreme case of galaxy and cluster co-evolution at z  = 0.7. Monthly Notices of the Royal Astronomical Society, 508(3), 3663-3671. https://doi.org/10.1093/mnras/stab2725

We report the discovery of eMACS J0252.4−2100 (eMACS J0252), a massive and highly evolved galaxy cluster at z = 0.703. Our analysis of Hubble Space Telescope imaging and VLT/MUSE and Keck/DEIMOS spectroscopy of the system finds a high-velocity disper... Read More about An extreme case of galaxy and cluster co-evolution at z  = 0.7.

Excitation mechanisms in the intracluster filaments surrounding brightest cluster galaxies (2021)
Journal Article
Polles, F., Salomé, P., Guillard, P., Godard, B., Pineau des Forêts, G., Olivares, V., Beckmann, R., Canning, R., Combes, F., Dubois, Y., Edge, A., Fabian, A., Ferland, G., Hamer, S., & Lehnert, M. (2021). Excitation mechanisms in the intracluster filaments surrounding brightest cluster galaxies. Astronomy & Astrophysics, 651, Article A13. https://doi.org/10.1051/0004-6361/202039730

Context. The excitation of the filamentary gas structures surrounding giant elliptical galaxies at the center of cool-core clusters, also known as brightest cluster galaxies (BCGs), is key to our understanding of active galactic nucleus (AGN) feedbac... Read More about Excitation mechanisms in the intracluster filaments surrounding brightest cluster galaxies.

Constraining the AGN duty cycle in the cool-core cluster MS 0735.6+7421 with LOFAR data (2021)
Journal Article
Biava, N., Brienza, M., Bonafede, A., Gitti, M., Bonnassieux, E., Harwood, J., Edge, A. C., Riseley, C. J., & Vantyghem, A. (2021). Constraining the AGN duty cycle in the cool-core cluster MS 0735.6+7421 with LOFAR data. Astronomy & Astrophysics, 650, Article A170. https://doi.org/10.1051/0004-6361/202040063

Context. MS 0735.6+7421 is a galaxy cluster that hosts a central radio galaxy with a very steep spectrum. The spectrum is produced by one of the most powerful known jetted active galactic nuclei (AGN). The radio plasma, ejected at nearly light speed... Read More about Constraining the AGN duty cycle in the cool-core cluster MS 0735.6+7421 with LOFAR data.

A Massive, Clumpy Molecular Gas Distribution and Displaced AGN in Zw 3146 (2021)
Journal Article
Vantyghem, A., McNamara, B., O’Dea, C., Baum, S., Combes, F., Edge, A., Fabian, A., McDonald, M., Nulsen, P., Russell, H., & Salomé, P. (2021). A Massive, Clumpy Molecular Gas Distribution and Displaced AGN in Zw 3146. Astrophysical Journal, 910(1), Article 53. https://doi.org/10.3847/1538-4357/abe306

We present a recent Atacama Large Millimeter/submillimeter Array observation of the CO(1−0) line emission in the central galaxy of the Zw 3146 galaxy cluster (z = 0.2906). We also present updated X-ray cavity measurements from archival Chandra observ... Read More about A Massive, Clumpy Molecular Gas Distribution and Displaced AGN in Zw 3146.

The quasar feedback survey: discovering hidden Radio-AGN and their connection to the host galaxy ionized gas (2021)
Journal Article
Jarvis, M., Harrison, C., Mainieri, V., Alexander, D., Arrigoni Battaia, F., Calistro Rivera, G., Circosta, C., Costa, T., De Breuck, C., Edge, A., Girdhar, A., Kakkad, D., Kharb, P., Lansbury, G., Molyneux, S., Mukherjee, D., Mullaney, J., Farina, E., S, S., Thomson, A., & Ward, S. (2021). The quasar feedback survey: discovering hidden Radio-AGN and their connection to the host galaxy ionized gas. Monthly Notices of the Royal Astronomical Society, 503(2), 1780-1797. https://doi.org/10.1093/mnras/stab549

We present the first results from the Quasar Feedback Survey, a sample of 42 z < 0.2, [O III] luminous AGNs ( L[O III] > 1042.1 ergs s−1) with moderate radio luminosities (i.e. L1.4GHz > 1023.4 W Hz−1; median L1.4GHz = 5.9 × 1023 W Hz−1). Using high... Read More about The quasar feedback survey: discovering hidden Radio-AGN and their connection to the host galaxy ionized gas.

A Multiwavelength Study of the Cool Core Cluster MACS J1447.4+0827 (2020)
Journal Article
Prasow-Émond, M., Hlavacek-Larrondo, J., Rhea, C., Latulippe, M., Gendron-Marsolais, M.-L., Richard-Laferrière, A., Sanders, J., Edge, A., Allen, S., Mantz, A., & Linden, A. V. D. (2020). A Multiwavelength Study of the Cool Core Cluster MACS J1447.4+0827. Astronomical Journal, 160(3), Article 103. https://doi.org/10.3847/1538-3881/ab9ff3

Clusters of galaxies are outstanding laboratories for understanding the physics of supermassive black hole (SMBH) feedback. Here we present the first Chandra, Karl G. Jansky Very Large Array, and Hubble Space Telescope analysis of MACS J1447.4+0827 (... Read More about A Multiwavelength Study of the Cool Core Cluster MACS J1447.4+0827.

Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters (2020)
Journal Article
Martz, C., McNamara, B., Nulsen, P., Vantyghem, A., Gingras, M.-J., Babyk, I. V., Russell, H., Edge, A., McDonald, M., Tamhane, P., Fabian, A., & Hogan, M. (2020). Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters. Astrophysical Journal, 897(1), Article 57. https://doi.org/10.3847/1538-4357/ab96cd

Chandra X-ray observations are analyzed for five galaxy clusters whose atmospheric cooling times, entropy parameters, and ratios of cooling time to freefall time within the central galaxies lie below 1 Gyr, below 30 keV cm2, and between 20 lesssim mi... Read More about Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters.

LOFAR observations of X-ray cavity systems (2020)
Journal Article
Shimwell, T., Röttgering, H., Morganti, R., Edge, A., Cuciti, V., Brunetti, G., Botteon, A., Brüggen, M., Rafferty, D., & Bîrzan, L. (2020). LOFAR observations of X-ray cavity systems. Monthly Notices of the Royal Astronomical Society, 496(3), 2613-2635. https://doi.org/10.1093/mnras/staa1594

We present LOFAR observations at 120–168 MHz of 42 systems with possible X-ray cavities in their hot atmosphere, of which 17 are groups or ellipticals, 19 are nearby clusters (z < 0.3), and six are higher redshift clusters (z > 0.3). The X-ray caviti... Read More about LOFAR observations of X-ray cavity systems.

A molecular absorption line survey toward the AGN of Hydra-A (2020)
Journal Article
Peck, A., Oonk, J., O’Dea, C., Nesvadba, N., Ferland, G., Fabian, A., Donahue, M., Bremer, M., Baum, S., Tremblay, G., Sarazin, C., Salomé, P., Gaspari, M., Russell, H., McNamara, B., Hamer, S., Combes, F., Edge, A., & Rose, T. (2020). A molecular absorption line survey toward the AGN of Hydra-A. Monthly Notices of the Royal Astronomical Society, 496(1), 364-380. https://doi.org/10.1093/mnras/staa1474

We present Atacama Large Millimeter/submillimeter Array observations of the brightest cluster galaxy Hydra-A, a nearby (z = 0.054) giant elliptical galaxy with powerful and extended radio jets. The observations reveal CO(1-0), CO(2-1), 13CO(2-1), CN(... Read More about A molecular absorption line survey toward the AGN of Hydra-A.

Decoherence in LOFAR-VLBI beamforming (2020)
Journal Article
Bonnassieux, E., Edge, A., Morabito, L., & Bonafede, A. (2020). Decoherence in LOFAR-VLBI beamforming. Astronomy & Astrophysics, 637, Article A51. https://doi.org/10.1051/0004-6361/202037486

We show that the use of a superstation (a phased array created using multiple stations of an interferometric array) created in post-processing for LOFAR-VLBI observations introduces a direction-dependent loss of signal in the image. We show this effe... Read More about Decoherence in LOFAR-VLBI beamforming.