Outputs (10)

How Are Red and Blue Quasars Different? The Radio Properties (2021)
Journal Article
Fawcett, V. A., Alexander, D. M., Rosario, D. J., & Klindt, L. (2021). How Are Red and Blue Quasars Different? The Radio Properties. Galaxies, 9(4), Article 107. https://doi.org/10.3390/galaxies9040107

A non-negligible fraction of quasars are red at optical wavelengths, indicating (in the majority of cases) that the accretion disc is obscured by a column of dust which extinguishes the shorter-wavelength blue emission. In this paper, we summarize re... Read More about How Are Red and Blue Quasars Different? The Radio Properties.

SUPER V. ALMA continuum observations of z ∼ 2 AGN and the elusive evidence of outflows influencing star formation (2021)
Journal Article
Lamperti, I., Harrison, C., Mainieri, V., Kakkad, D., Perna, M., Circosta, C., Scholtz, J., Carniani, S., Cicone, C., Alexander, D., Bischetti, M., Calistro Rivera, G., Chen, C.-C., Cresci, G., Feruglio, C., Fiore, F., Mannucci, F., Marconi, A., Martínez-Ramírez, L., Netzer, H., …Zappacosta, L. (2021). SUPER V. ALMA continuum observations of z ∼ 2 AGN and the elusive evidence of outflows influencing star formation. Astronomy & Astrophysics, 654, Article A90. https://doi.org/10.1051/0004-6361/202141363

We study the impact of active galactic nuclei (AGN) ionised outflows on star formation in high-redshift AGN host galaxies, by combining near-infrared integral field spectroscopic (IFS) observations, mapping the Hα emission and [O III]λ5007 outflows,... Read More about SUPER V. ALMA continuum observations of z ∼ 2 AGN and the elusive evidence of outflows influencing star formation.

The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field (2021)
Journal Article
Zhao, X., Civano, F., Fornasini, F., Alexander, D., Cappelluti, N., Chen, C., Cohen, S., Elvis, M., Gandhi, P., Grogin, N., Hickox, R., Jansen, R., Koekemoer, A., Lanzuisi, G., Maksym, W., Masini, A., Rosario, D., Ward, M., Willmer, C., & Windhorst, R. (2021). The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field. Monthly Notices of the Royal Astronomical Society, 508(4), 5176-5195. https://doi.org/10.1093/mnras/stab2885

We present the NuSTAR extragalactic survey of the James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-Domain Field. The survey covers a ∼0.16 deg2 area with a total exposure of 681 ks acquired in a total of nine observations from three e... Read More about The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field.

On the Nature of AGN and Star Formation Enhancement in the z = 3.1 SSA22 Protocluster: The HST WFC3 IR View (2021)
Journal Article
Monson, E. B., Lehmer, B. D., Doore, K., Eufrasio, R. T., Bonine, B., Alexander, D. M., Harrison, C. M., Kubo, M., Mantha, K. B., Saez, C., Straughn, A., & Umehata, H. (2021). On the Nature of AGN and Star Formation Enhancement in the z = 3.1 SSA22 Protocluster: The HST WFC3 IR View. Astrophysical Journal, 919(1), Article 51. https://doi.org/10.3847/1538-4357/ac0f84

We examine possible environmental sources of the enhanced star formation and active galactic nucleus (AGN) activity in the z = 3.09 SSA22 protocluster using Hubble WFC3 F160W (∼1.6 μm) observations of the SSA22 field, including new observations cente... Read More about On the Nature of AGN and Star Formation Enhancement in the z = 3.1 SSA22 Protocluster: The HST WFC3 IR View.

The XMM-SERVS Survey: XMM-Newton Point-source Catalogs for the W-CDF-S and ELAIS-S1 Fields (2021)
Journal Article
Ni, Q., Brandt, W., Chen, C.-T., Luo, B., Nyland, K., Yang, G., Zou, F., Aird, J., Alexander, D. M., Bauer, F. E., Lacy, M., Lehmer, B. D., Mallick, L., Salvato, M., Schneider, D. P., Tozzi, P., Traulsen, I., Vaccari, M., Vignali, C., Vito, F., …Trump, J. R. (2021). The XMM-SERVS Survey: XMM-Newton Point-source Catalogs for the W-CDF-S and ELAIS-S1 Fields. Astrophysical Journal Supplement, 256(1), Article 21. https://doi.org/10.3847/1538-4365/ac0dc6

We present the X-ray point-source catalogs in two of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields, W-CDF-S (4.6 deg2) and ELAIS-S1 (3.2 deg2), aiming to fill the gap between deep pencil-beam X-ray surveys and shallow... Read More about The XMM-SERVS Survey: XMM-Newton Point-source Catalogs for the W-CDF-S and ELAIS-S1 Fields.

Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales? (2021)
Journal Article
Yan, W., Hickox, R. C., Chen, C.-T. J., Ricci, C., Masini, A., Bauer, F. E., & Alexander, D. M. (2021). Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?. Astrophysical Journal, 914(2), Article 83. https://doi.org/10.3847/1538-4357/abfaa0

In active galactic nuclei (AGNs), fluorescent Fe Kα (iron) line emission is generally interpreted as originating from obscuring material around a supermassive black hole on the scale of a few parsecs. However, recent Chandra studies indicate the exis... Read More about Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?.

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., Fawcett, V., & 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.

The impact of ionized outflows from z ∼ 2.5 quasars is not through instantaneous in situ quenching: the evidence from ALMA and VLT/SINFONI (2021)
Journal Article
Scholtz, J., Harrison, C., Rosario, D., Alexander, D., Knudsen, K., Stanley, F., Chen, C.-C., Kakkad, D., Mainieri, V., & Mullaney, J. (2021). The impact of ionized outflows from z ∼ 2.5 quasars is not through instantaneous in situ quenching: the evidence from ALMA and VLT/SINFONI. Monthly Notices of the Royal Astronomical Society, 505(4), 5469-5487. https://doi.org/10.1093/mnras/stab1631

We present high-resolution (∼2.4 kpc) ALMA band 7 observations (rest-frame λ ∼ 250 μm) of three powerful z ∼ 2.5 quasars (Lbol = 1047.3–1047.5 erg s−1). These targets have previously been reported as showing evidence for suppressed star formation bas... Read More about The impact of ionized outflows from z ∼ 2.5 quasars is not through instantaneous in situ quenching: the evidence from ALMA and VLT/SINFONI.

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., Fawcett, V., Morabito, L., Klindt, L., Best, P., Bonato, M., Bowler, R., Costa, T., & 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 post-Herschel view of intrinsic AGN emission: constructing templates for galaxy and AGN emission at IR wavelengths (2021)
Journal Article
Bernhard, E., Tadhunter, C., Mullaney, J., Grimmett, L., Rosario, D., & Alexander, D. (2021). The post-Herschel view of intrinsic AGN emission: constructing templates for galaxy and AGN emission at IR wavelengths. Monthly Notices of the Royal Astronomical Society, 503(2), 2598-2621. https://doi.org/10.1093/mnras/stab419

Measuring the star-forming properties of active galactic nucleus (AGN) hosts is key to our understanding of galaxy formation and evolution. However, this topic remains debated, partly due to the difficulties in separating the infrared (i.e. 1–1000 μm... Read More about The post-Herschel view of intrinsic AGN emission: constructing templates for galaxy and AGN emission at IR wavelengths.