All Outputs (15)

GOODS-ALMA: Using IRAC and VLA to probe fainter millimeter galaxies (2020)
Journal Article
Franco, M., Elbaz, D., Zhou, L., Magnelli, B., Schreiber, C., Ciesla, L., Dickinson, M., Nagar, N., Magdis, G., Alexander, D., Béthermin, M., Demarco, R., Daddi, E., Wang, T., Mullaney, J., Inami, H., Shu, X., Bournaud, F., Chary, R., Coogan, R., …Xiao, M. (2020). GOODS-ALMA: Using IRAC and VLA to probe fainter millimeter galaxies. Astronomy & Astrophysics, 643, Article A53. https://doi.org/10.1051/0004-6361/202038310

In this paper, we extend the source detection in the GOODS-ALMA field (69 arcmin2, 1σ ≃ 0.18 mJy beam−1) to deeper levels than presented in our previous work. Using positional information at 3.6 and 4.5 μm (from Spitzer-IRAC) as well as the Very Larg... Read More about GOODS-ALMA: Using IRAC and VLA to probe fainter millimeter galaxies.

GOODS-ALMA: The slow downfall of star formation in z = 2–3 massive galaxies (2020)
Journal Article
Franco, M., Elbaz, D., Zhou, L., Magnelli, B., Schreiber, C., Ciesla, L., Dickinson, M., Nagar, N., Magdis, G., Alexander, D., Béthermin, M., Demarco, R., Daddi, E., Wang, T., Mullaney, J., Sargent, M., Inami, H., Shu, X., Bournaud, F., Chary, R., …Xiao, M. (2020). GOODS-ALMA: The slow downfall of star formation in z = 2–3 massive galaxies. Astronomy & Astrophysics, 643, Article A30. https://doi.org/10.1051/0004-6361/202038312

We investigate the properties of a sample of 35 galaxies, detected with the Atacama Large Millimeter/Submillimeter Array (ALMA) at 1.1 mm in the GOODS-ALMA field (area of 69 arcmin2, resolution = 0.60″, rms ≃ 0.18 mJy beam−1). Using the ultraviolet-t... Read More about GOODS-ALMA: The slow downfall of star formation in z = 2–3 massive galaxies.

The Chandra Deep Wide-field Survey: A New Chandra Legacy Survey in the Boötes Field. I. X-Ray Point Source Catalog, Number Counts, and Multiwavelength Counterparts (2020)
Journal Article
Masini, A., Hickox, R. C., Carroll, C. M., Aird, J., Alexander, D. M., Assef, R. J., Bower, R., Brodwin, M., Brown, M. J., Chatterjee, S., Chen, C.-T. J., Dey, A., DiPompeo, M. A., Duncan, K. J., Eisenhardt, P. R., Forman, W. R., Gonzalez, A. H., Goulding, A. D., Hainline, K. N., Jannuzi, B. T., …Murray, S. S. (2020). The Chandra Deep Wide-field Survey: A New Chandra Legacy Survey in the Boötes Field. I. X-Ray Point Source Catalog, Number Counts, and Multiwavelength Counterparts. Astrophysical Journal Supplement, 251(1), Article 2. https://doi.org/10.3847/1538-4365/abb607

We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg2 Boötes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the universe at high redshift. The Chandra... Read More about The Chandra Deep Wide-field Survey: A New Chandra Legacy Survey in the Boötes Field. I. X-Ray Point Source Catalog, Number Counts, and Multiwavelength Counterparts.

GOODS-ALMA: Optically dark ALMA galaxies shed light on a cluster in formation at z = 3.5 (2020)
Journal Article
Zhou, L., Elbaz, D., Franco, M., Magnelli, B., Schreiber, C., Wang, T., Ciesla, L., Daddi, E., Dickinson, M., Nagar, N., Magdis, G., Alexander, D., Béthermin, M., Demarco, R., Mullaney, J., Bournaud, F., Ferguson, H., Finkelstein, S., Giavalisco, M., Inami, H., …Silverman, J. (2020). GOODS-ALMA: Optically dark ALMA galaxies shed light on a cluster in formation at z = 3.5. Astronomy & Astrophysics, 642, Article A155. https://doi.org/10.1051/0004-6361/202038059

Thanks to its outstanding angular resolution, the Atacama Large Millimeter/submillimeter Array (ALMA) has recently unambiguously identified a population of optically dark galaxies with redshifts greater than z = 3, which play an important role in the... Read More about GOODS-ALMA: Optically dark ALMA galaxies shed light on a cluster in formation at z = 3.5.

High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets (2020)
Journal Article
Jarvis, M., Harrison, C., Mainieri, V., Rivera, G. C., Jethwa, P., Zhang, Z.-Y., Alexander, D., Circosta, C., Costa, T., De Breuck, C., Kakkad, D., Kharb, P., Lansbury, G., & Thomson, A. (2020). High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets. Monthly Notices of the Royal Astronomical Society, 498(2), 1560-1575. https://doi.org/10.1093/mnras/staa2196

We use a sample of powerful z≈0.1 type 2 quasars (‘obscured’; log [LAGN/erg s−1]≳45), which host kiloparsec-scale ionized outflows and jets, to identify possible signatures of AGN feedback on the total molecular gas reservoirs of their host galaxies.... Read More about High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets.

The Star-Formation Properties of the Observed and Simulated AGN Universe: BAT vs EAGLE (2020)
Journal Article
Jackson, T. M., Rosario, D., Alexander, D., Scholtz, J., McAlpine, S., & Bower, R. (2020). The Star-Formation Properties of the Observed and Simulated AGN Universe: BAT vs EAGLE. Monthly Notices of the Royal Astronomical Society, 498(2), 2323-2338. https://doi.org/10.1093/mnras/staa2414

In this paper we present data from 72 low redshift, hard X-ray selected AGN taken from the Swift-BAT 58 month catalogue. We utilise spectral energy distribution fitting to the optical to IR photometry in order to estimate host galaxy properties. We c... Read More about The Star-Formation Properties of the Observed and Simulated AGN Universe: BAT vs EAGLE.

NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration? (2020)
Journal Article
Zappacosta, L., Stern, D., Ricci, C., Nardini, E., Masini, A., Marchesi, S., Lanz, L., Koss, M., Harrison, F., Farrah, D., Moro, A. D., Chen, C.-T., Brightman, M., Brandt, W., Boorman, P., Bauer, F., Ballantyne, D., Baloković, M., Asmus, D., Lansbury, G., …Annuar, A. (2020). NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?. Monthly Notices of the Royal Astronomical Society, 497(1), 229-245. https://doi.org/10.1093/mnras/staa1820

We present NuSTAR observations of four active galactic nuclei (AGN) located within 15 Mpc. These AGN, namely ESO 121-G6, NGC 660, NGC 3486 and NGC 5195, have observed X-ray luminosities of L2-10 keV, obs ≲ 1039 erg s−1, classifying them as low lumino... Read More about NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?.

Searching for obscured AGN in z ∼ 2 submillimetre galaxies (2020)
Journal Article
Chen, H., Garrett, M., Chi, S., Thomson, A., Barthel, P., Alexander, D., Muxlow, T., Beswick, R., Radcliffe, J., Wrigley, N., Guidetti, D., Bondi, M., Prandoni, I., Smail, I., McHardy, I., & Argo, M. (2020). Searching for obscured AGN in z ∼ 2 submillimetre galaxies. Astronomy & Astrophysics, 638, Article A113. https://doi.org/10.1051/0004-6361/201937162

Aims. Submillimetre-selected galaxies (SMGs) at high redshift (z ∼ 2) are potential host galaxies of active galactic nuclei (AGN). If the local Universe is a good guide, ∼50% of the obscured AGN amongst the SMG population could be missed even in the... Read More about Searching for obscured AGN in z ∼ 2 submillimetre galaxies.

X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields (2020)
Journal Article
Lehmer, B. D., Ferrell, A. P., Doore, K., Eufrasio, R. T., Monson, E. B., Alexander, D. M., Basu-Zych, A., Brandt, W. N., Sivakoff, G. R., Tzanavaris, P., Yukita, M., Fragos, T., & Ptak, A. (2020). X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields. Astrophysical Journal Supplement, 248(2), Article 31. https://doi.org/10.3847/1538-4365/ab9175

We investigate X-ray binary (XRB) luminosity function (XLF) scaling relations for Chandra-detected populations of low-mass XRBs (LMXBs) within the footprints of 24 early-type galaxies. Our sample includes Chandra and Hubble Space Telescope observed g... Read More about X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields.

The Bolometric Quasar Luminosity Function at z = 0 − 7 (2020)
Journal Article
Hickox, R., Ross, N. P., Richards, G. T., Alexander, D., Faucher-Giguère, C.-A., Hopkins, P. F., & Shen, X. (2020). The Bolometric Quasar Luminosity Function at z = 0 − 7. Monthly Notices of the Royal Astronomical Society, 495(3), 3252-3275. https://doi.org/10.1093/mnras/staa1381

In this paper, we provide updated constraints on the bolometric quasar luminosity function (QLF) from 푧 = 0 to 푧 = 7. The constraints are based on an observational compilation that includes observations in the rest-frame IR, B band, UV, soft and ha... Read More about The Bolometric Quasar Luminosity Function at z = 0 − 7.

A binning-free method reveals a continuous relationship between galaxies’ AGN power and offset from main sequence (2020)
Journal Article
Walters, K., Masoura, V., Stanley, F., Alexander, D., Harrison, C., Bernhard, E., Mullaney, J., & Grimmett, L. (2020). A binning-free method reveals a continuous relationship between galaxies’ AGN power and offset from main sequence. Monthly Notices of the Royal Astronomical Society, 495(1), 1392-1402. https://doi.org/10.1093/mnras/staa1255

Studies investigating the relationship between AGN power and the star formation rates (SFRs) of their host galaxies often rely on averaging techniques – such as stacking – to incorporate information from non-detections. However, averages, and especia... Read More about A binning-free method reveals a continuous relationship between galaxies’ AGN power and offset from main sequence.

Galaxy mergers in eagle do not induce a significant amount of black hole growth yet do increase the rate of luminous AGN (2020)
Journal Article
Patton, D. R., Johansson, P. H., Ellison, S. L., Alexander, D. M., Rosario, D. J., Harrison, C. M., & McAlpine, S. (2020). Galaxy mergers in eagle do not induce a significant amount of black hole growth yet do increase the rate of luminous AGN. Monthly Notices of the Royal Astronomical Society, 494(4), 5713–5733. https://doi.org/10.1093/mnras/staa1123

We investigate the connection between galaxy–galaxy mergers and enhanced black hole (BH) growth using the cosmological hydrodynamical eagle simulation. We do this via three methods of analysis, investigating: the merger fraction of AGN, the AGN fract... Read More about Galaxy mergers in eagle do not induce a significant amount of black hole growth yet do increase the rate of luminous AGN.

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.