Outputs (374)

Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars (2020)
Journal Article
Fawcett, V., Alexander, D., Rosario, D., Klindt, L., Fotopoulou, S., Lusso, E., Morabito, L., & Calistro Rivera, G. (2020). Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars. Monthly Notices of the Royal Astronomical Society, 494(4), 4802-4818. https://doi.org/10.1093/mnras/staa954

We have recently used the Faint Images of the Radio Sky at Twenty-centimeters (FIRST) survey to show that red quasars have fundamentally different radio properties to typical blue quasars: a significant (factor ≈3) enhancement in the radio-detection... Read More about Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars.

Local AGN Survey (LASr): I. Galaxy sample, infrared colour selection and predictions for AGN within 100 Mpc (2020)
Journal Article
Asmus, D., Greenwell, C., Gandhi, P., Boorman, P., Aird, J., Alexander, D., Assef, R., Baldi, R., Davies, R., Hönig, S., Ricci, C., Rosario, D., Salvato, M., Shankar, F., & Stern, D. (2020). Local AGN Survey (LASr): I. Galaxy sample, infrared colour selection and predictions for AGN within 100 Mpc. Monthly Notices of the Royal Astronomical Society, 494(2), 1784-1816. https://doi.org/10.1093/mnras/staa766

To answer major questions on supermassive black hole (SMBH) and galaxy evolution, a complete census of SMBH growth, i.e., active galactic nuclei (AGN), is required. Thanks to all-sky surveys by the Wide-field Infrared Survey Explorer (WISE) and the S... Read More about Local AGN Survey (LASr): I. Galaxy sample, infrared colour selection and predictions for AGN within 100 Mpc.

KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6 (2020)
Journal Article
Scholtz, J., Harrison, C., Rosario, D., Alexander, D., Chen, C.-C., Kakkad, D., Mainieri, V., Tiley, A., Turner, O., Cirasuolo, M., Sharples, R., & Stach, S. (2020). KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6. Monthly Notices of the Royal Astronomical Society, 492(3), 3194-3216. https://doi.org/10.1093/mnras/staa030

As part of our KMOS AGN Survey at High-redshift (KASHz), we present spatially-resolved VLT/KMOS and VLT/SINFONI spectroscopic data and ALMA 870μm continuum imaging of eight z=1.4–2.6 moderate AGN (⁠L 2−10kev L2−10kev = 1042 − 1045 ergs s−1). We map [... Read More about KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6.

Planck Far-infrared Detection of Hyper Suprime-Cam Protoclusters at z ∼ 4: Hidden AGN and Star Formation Activity (2019)
Journal Article
Kubo, M., Toshikawa, J., Kashikawa, N., Chiang, Y.-K., Overzier, R., Uchiyama, H., Clements, D. L., Alexander, D. M., Matsuda, Y., Kodama, T., Ono, Y., Goto, T., Cheng, T.-A., & Ito, K. (2019). Planck Far-infrared Detection of Hyper Suprime-Cam Protoclusters at z ∼ 4: Hidden AGN and Star Formation Activity. Astrophysical Journal, 887(2), https://doi.org/10.3847/1538-4357/ab5a80

We perform a stacking analysis of Planck, AKARI, Infrared Astronomical Satellite, Wide-field Infrared Survey Explorer, and Herschel images of the largest number of (candidate) protoclusters at z ∼ 3.8 selected from the Hyper Suprime-Cam Subaru Strate... Read More about Planck Far-infrared Detection of Hyper Suprime-Cam Protoclusters at z ∼ 4: Hidden AGN and Star Formation Activity.

Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei (2019)
Journal Article
Zanisi, L., Villforth, C., Suh, H., Sheth, R. K., Rodighiero, G., Ricci, F., Mezcua, M., Menci, N., Lu, Y., Lapi, A., La Franca, F., Duras, F., Delvecchio, I., Daddi, E., Civano, F., Calderone, G., Bongiorno, A., Ananna, T. T., Allevato, V., Alexander, D. M., …Shankar, F. (2020). Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 493(1), 1500-1511. https://doi.org/10.1093/mnras/stz3522

The masses of supermassive black holes at the centres of local galaxies appear to be tightly correlated with the mass and velocity dispersions of their galactic hosts. However, the local Mbh–Mstar relation inferred from dynamically measured inactive... Read More about Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei.

Does black hole growth depend fundamentally on host-galaxy compactness? (2019)
Journal Article
Ni, Q., Yang, G., Brandt, W., Alexander, D., Chen, C.-T., Luo, B., Vito, F., & Xue, Y. (2019). Does black hole growth depend fundamentally on host-galaxy compactness?. Monthly Notices of the Royal Astronomical Society, 490(1), 1135-1155. https://doi.org/10.1093/mnras/stz2623

Possible connections between central black hole (BH) growth and host-galaxy compactness have been found observationally, which may provide insight into BH–galaxy coevolution: compact galaxies might have large amounts of gas in their centres due to th... Read More about Does black hole growth depend fundamentally on host-galaxy compactness?.

Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation (2019)
Journal Article
Klindt, L., Alexander, D., Rosario, D., Lusso, E., & Fotopoulou, S. (2019). Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation. Monthly Notices of the Royal Astronomical Society, 488(3), 3109-3128. https://doi.org/10.1093/mnras/stz1771

A minority of the optically selected quasar population are red at optical wavelengths due to the presence of dust along the line of sight. A key focus of many red quasar studies is to understand their relationship with the overall quasar population:... Read More about Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation.

Evident black hole-bulge coevolution in the distant universe (2019)
Journal Article
Yang(杨光), G., Brandt, W., Alexander, D., Chen(陳建廷), C.-T., Ni(倪清泠), Q., Vito, F., & Zhu(朱飞凡), F.-F. (2019). Evident black hole-bulge coevolution in the distant universe. Monthly Notices of the Royal Astronomical Society, 485(3), 3721-3737. https://doi.org/10.1093/mnras/stz611

Observations in the local universe show a tight correlation between the masses of supermassive black holes (SMBHs; MBH) and host-galaxy bulges (Mbulge), suggesting a strong connection between SMBH and bulge growth.However, direct evidence for such a... Read More about Evident black hole-bulge coevolution in the distant universe.

Prevalence of radio jets associated with galactic outflows and feedback from quasars (2019)
Journal Article
Jarvis, M., Harrison, C., Thomson, A., Circosta, C., Mainieri, V., Alexander, D., Edge, A., Lansbury, G., Molyneux, S., & Mullaney, J. (2019). Prevalence of radio jets associated with galactic outflows and feedback from quasars. Monthly Notices of the Royal Astronomical Society, 485(2), 2710-2730. https://doi.org/10.1093/mnras/stz556

We present 1–7 GHz high-resolution radio imaging (VLA and e-MERLIN) and spatially resolved ionized gas kinematics for 10 z < 0.2 type 2 ‘obscured’ quasars (log [LAGN/erg s−1] 45) with moderate radio luminosities (log[L1.4 GHz/W Hz−1] = 23.3–24.4). Th... Read More about Prevalence of radio jets associated with galactic outflows and feedback from quasars.

NuSTAR and Keck Observations of Heavily Obscured Quasars Selected by WISE (2019)
Journal Article
Yan, W., Hickox, R. C., Hainline, K. N., Stern, D., Lansbury, G., Alexander, D. M., Hviding, R. E., Assef, R. J., Ballantyne, D. R., Dipompeo, M. A., Lanz, L., Carroll, C. M., Koss, M., Lamperti, I., Civano, F., Moro, A. D., Gandhi, P., & Myers, A. D. (2019). NuSTAR and Keck Observations of Heavily Obscured Quasars Selected by WISE. Astrophysical Journal, 870(1), Article 33. https://doi.org/10.3847/1538-4357/aaeed4

A primary aim of the ${Nuclear}\,{Spectroscopic}\,{Telescope}\,{Array}$ (NuSTAR) mission is to find and characterize heavily obscured Active Galactic Nuclei (AGNs). Based on mid-infrared photometry from the Wide-Field Infrared Survey Explorer (WISE)... Read More about NuSTAR and Keck Observations of Heavily Obscured Quasars Selected by WISE.