The VST ATLAS Quasar Survey – III. Halo mass function via quasar clustering and quasar-CMB lensing cross-clustering
(2024)
Journal Article
Eltvedt, A. M., Shanks, T., Metcalfe, N., Ansarinejad, B., Barrientos, L. F., Murphy, D. N. A., & Alexander, D. M. (2024). The VST ATLAS Quasar Survey – III. Halo mass function via quasar clustering and quasar-CMB lensing cross-clustering. Monthly Notices of the Royal Astronomical Society, 535(3), 2105-2114. https://doi.org/10.1093/mnras/stae2467
Dr Nigel Metcalfe's Outputs (167)
The VST ATLAS Quasar Survey – II. Halo mass profiles of galaxies, LRGs and galaxy clusters via quasar and CMB lensing (2024)
Journal Article
Eltvedt, A. M., Shanks, T., Metcalfe, N., Ansarinejad, B., Barrientos, L. F., Murphy, D. N. A., & Alexander, D. M. (2024). The VST ATLAS Quasar Survey – II. Halo mass profiles of galaxies, LRGs and galaxy clusters via quasar and CMB lensing. Monthly Notices of the Royal Astronomical Society, 535(3), 2092-2104. https://doi.org/10.1093/mnras/stae2466We cross-correlate a low-contamination subset of the VST ATLAS g < 22.5 quasar catalogue with g < 21.5 galaxy clusters, r < 21 galaxies and r < 19.5 luminous red galaxies (LRGs) to probe their halo mass profiles via quasar magnification bias caused b... Read More about The VST ATLAS Quasar Survey – II. Halo mass profiles of galaxies, LRGs and galaxy clusters via quasar and CMB lensing.
The VST ATLAS quasar survey I: Catalogue of photometrically selected quasar candidates (2023)
Journal Article
Eltvedt, A. M., Shanks, T., Metcalfe, N., Ansarinejad, B., Barrientos, L., Sharp, R., Malik, U., Murphy, D., Irwin, M., Wilson, M., Alexander, D., Kovacs, A., Garcia-Bellido, J., Ahlen, S., Brooks, D., de la Macorra, A., Font-Ribera, A., Gontcho a Gontcho, S., Honscheid, K., Meisner, A., …Zhou, Z. (2023). The VST ATLAS quasar survey I: Catalogue of photometrically selected quasar candidates. Monthly Notices of the Royal Astronomical Society, 521(3), 3384-3404. https://doi.org/10.1093/mnras/stad516We present the VST ATLAS Quasar Survey, consisting of ∼1229 000 quasar (QSO) candidates with 16 < g < 22.5 over ∼4700 deg2. The catalogue is based on VST ATLAS+NEOWISE imaging surveys and aims to reach a QSO sky density of 130 deg−2 for z < 2.2 and ∼... Read More about The VST ATLAS quasar survey I: Catalogue of photometrically selected quasar candidates.
VST ATLAS galaxy cluster catalogue I: cluster detection and mass calibration (2023)
Journal Article
Ansarinejad, B., Murphy, D., Shanks, T., & Metcalfe, N. (2023). VST ATLAS galaxy cluster catalogue I: cluster detection and mass calibration. Monthly Notices of the Royal Astronomical Society, 520(1), 1371-1389. https://doi.org/10.1093/mnras/stac3815Taking advantage of ∼4700 deg2 optical coverage of the Southern sky offered by the VST ATLAS survey, we construct a new catalogue of photometrically selected galaxy groups and clusters using the ORCA cluster detection algorithm. The catalogue contain... Read More about VST ATLAS galaxy cluster catalogue I: cluster detection and mass calibration.
The local hole: a galaxy underdensity covering 90 per cent of sky to ≈200 Mpc (2022)
Journal Article
Wong, J. H., Shanks, T., Metcalfe, N., & Whitbourn, J. (2022). The local hole: a galaxy underdensity covering 90 per cent of sky to ≈200 Mpc. Monthly Notices of the Royal Astronomical Society, 511(4), 5742-5755. https://doi.org/10.1093/mnras/stac396We investigate the ‘Local Hole’, an anomalous underdensity in the local galaxy environment, by extending our previous galaxy K-band number-redshift and number-magnitude counts to ≈90 per cent of the sky. Our redshift samples are taken from the 2MASS... Read More about The local hole: a galaxy underdensity covering 90 per cent of sky to ≈200 Mpc.
The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms (2022)
Journal Article
Ansarinejad, B., Shanks, T., Bielby, R., Metcalfe, N., Infante, L., Murphy, D., Rosario, D., & Stach, S. (2022). The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms. Monthly Notices of the Royal Astronomical Society, 510(4), 4976-4991. https://doi.org/10.1093/mnras/stac002We compare the contribution of active galactic nuclei (AGNs) and star formation towards dust heating in sub-mm galaxies (SMGs). We have used ALMA at 0.1-arcsec resolution to image a complete flux-limited sample of seven sub-mm sources previously show... Read More about The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms.
The nature of sub-millimetre galaxies I: a comparison of AGN and star-forming galaxy SED fits (2021)
Journal Article
Shanks, T., Ansarinejad, B., Bielby, R., Heywood, I., Metcalfe, N., & Wang, L. (2021). The nature of sub-millimetre galaxies I: a comparison of AGN and star-forming galaxy SED fits. Monthly Notices of the Royal Astronomical Society, 505(1), 1509-1529. https://doi.org/10.1093/mnras/stab1226High-redshift sub-millimetre galaxies (SMGs) are usually assumed to be powered by star formation. However, it has been clear for some time that >20 per cent of such sourcesbrighter than ≈3 mJy host quasars. Here, we analyse a complete sample of 12 su... Read More about The nature of sub-millimetre galaxies I: a comparison of AGN and star-forming galaxy SED fits.
SuperRAENN: A Semisupervised Supernova Photometric Classification Pipeline Trained on Pan-STARRS1 Medium-Deep Survey Supernovae (2020)
Journal Article
Villar, V. A., Hosseinzadeh, G., Berger, E., Ntampaka, M., Jones, D. O., Challis, P., Chornock, R., Drout, M. R., Foley, R. J., Kirshner, R. P., Lunnan, R., Margutti, R., Milisavljevic, D., Sanders, N., Pan, Y.-C., Rest, A., Scolnic, D. M., Magnier, E., Metcalfe, N., Wainscoat, R., & Waters, C. (2020). SuperRAENN: A Semisupervised Supernova Photometric Classification Pipeline Trained on Pan-STARRS1 Medium-Deep Survey Supernovae. Astrophysical Journal, 905(2), Article 94. https://doi.org/10.3847/1538-4357/abc6fdAutomated classification of supernovae (SNe) based on optical photometric light-curve information is essential in the upcoming era of wide-field time domain surveys, such as the Legacy Survey of Space and Time (LSST) conducted by the Rubin Observator... Read More about SuperRAENN: A Semisupervised Supernova Photometric Classification Pipeline Trained on Pan-STARRS1 Medium-Deep Survey Supernovae.
Photometric Classification of 2315 Pan-STARRS1 Supernovae with Superphot (2020)
Journal Article
Hosseinzadeh, G., Dauphin, F., Villar, V. A., Berger, E., Jones, D. O., Challis, P., Chornock, R., Drout, M. R., Foley, R. J., Kirshner, R. P., Lunnan, R., Margutti, R., Milisavljevic, D., Pan, Y.-C., Rest, A., Scolnic, D. M., Magnier, E., Metcalfe, N., Wainscoat, R., & Waters, C. (2020). Photometric Classification of 2315 Pan-STARRS1 Supernovae with Superphot. Astrophysical Journal, 905(2), Article 93. https://doi.org/10.3847/1538-4357/abc42bThe classification of supernovae (SNe) and its impact on our understanding of explosion physics and progenitors have traditionally been based on the presence or absence of certain spectral features. However, current and upcoming wide-field time-domai... Read More about Photometric Classification of 2315 Pan-STARRS1 Supernovae with Superphot.
The Pan-STARRS1 Database and Data Products (2020)
Journal Article
Flewelling, H., Magnier, E., Chambers, K., Heasley, J., Holmberg, C., Huber, M., Sweeney, W., Waters, C., Calamida, A., Casertano, S., Chen, X., Farrow, D., Hasinger, G., Henderson, R., Long, K., Metcalfe, N., Narayan, G., Nieto-Santisteban, M., Norberg, P., Rest, A., …Shiao, B. (2020). The Pan-STARRS1 Database and Data Products. Astrophysical Journal Supplement, 251(1), Article 7. https://doi.org/10.3847/1538-4365/abb82dThis paper describes the organization of the database and the catalog data products from the Pan-STARRS1 3π Steradian Survey. The catalog data products are available in the form of an SQL-based relational database from MAST, the Mikulski Archive for... Read More about The Pan-STARRS1 Database and Data Products.
Pan-STARRS Pixel Processing: Detrending, Warping, Stacking (2020)
Journal Article
Waters, C., Magnier, E., Price, P., Chambers, K., Burgett, W., Draper, P., Flewelling, H., Hodapp, K., Huber, M., Jedicke, R., Kaiser, N., Kudritzki, R.-P., Lupton, R., Metcalfe, N., Rest, A., Sweeney, W., Tonry, J., Wainscoat, R., & Wood-Vasey, W. (2020). Pan-STARRS Pixel Processing: Detrending, Warping, Stacking. Astrophysical Journal Supplement, 251(1), Article 4. https://doi.org/10.3847/1538-4365/abb82bThe Pan-STARRS1 (PS1) Science Consortium has carried out a set of imaging surveys using the 1.4 gigapixel GPC1 camera on the PS1 telescope. As this camera is composed of many individual electronic readouts and covers a very large field of view, great... Read More about Pan-STARRS Pixel Processing: Detrending, Warping, Stacking.
Pan-STARRS Photometric and Astrometric Calibration (2020)
Journal Article
Magnier, E. A., Schlafly, E. F., Finkbeiner, D. P., Tonry, J., Goldman, B., Röser, S., Schilbach, E., Casertano, S., Chambers, K., Flewelling, H., Huber, M., Price, P., Sweeney, W., Waters, C., Denneau, L., Draper, P., Hodapp, K., Jedicke, R., Kaiser, N., Kudritzki, R.-P., …Wainscoat, R. (2020). Pan-STARRS Photometric and Astrometric Calibration. Astrophysical Journal Supplement, 251(1), Article 6. https://doi.org/10.3847/1538-4365/abb82aWe present the details of the photometric and astrometric calibration of the Pan-STARRS1 3π Survey. The photometric goals were to reduce the systematic effects introduced by the camera and detectors, and to place all of the observations onto a photom... Read More about Pan-STARRS Photometric and Astrometric Calibration.
The Pan-STARRS Data-processing System (2020)
Journal Article
Magnier, E. A., Chambers, K., Flewelling, H., Hoblitt, J., Huber, M., Price, P., Sweeney, W., Waters, C., Denneau, L., Draper, P., Hodapp, K., Jedicke, R., Kaiser, N., Kudritzki, R.-P., Metcalfe, N., Stubbs, C., & Wainscoat, R. (2020). The Pan-STARRS Data-processing System. Astrophysical Journal Supplement, 251(1), Article 3. https://doi.org/10.3847/1538-4365/abb829The Pan-STARRS data-processing system is responsible for the steps needed to downloaded, archive, and process all images obtained by the Pan-STARRS telescopes, including real-time detection of transient sources such as supernovae and moving objects i... Read More about The Pan-STARRS Data-processing System.
Pan-STARRS Pixel Analysis: Source Detection and Characterization (2020)
Journal Article
Magnier, E. A., Sweeney, W., Chambers, K., Flewelling, H., Huber, M., Price, P., Waters, C., Denneau, L., Draper, P., Farrow, D., Jedicke, R., Hodapp, K., Kaiser, N., Kudritzki, R.-P., Metcalfe, N., Stubbs, C., & Wainscoat, R. (2020). Pan-STARRS Pixel Analysis: Source Detection and Characterization. Astrophysical Journal Supplement, 251(1), Article 5. https://doi.org/10.3847/1538-4365/abb82cOver 3 billion astronomical sources have been detected in the more than 22 million orthogonal transfer CCD images obtained as part of the Pan-STARRS1 3π survey. Over 85 billion instances of those sources have been automatically detected and character... Read More about Pan-STARRS Pixel Analysis: Source Detection and Characterization.
Cross-correlating Planck with VST ATLAS LRGs: a new test for the ISW effect in the Southern Hemisphere (2020)
Journal Article
Ansarinejad, B., Mackenzie, R., shanks, T., & Metcalfe, N. (2020). Cross-correlating Planck with VST ATLAS LRGs: a new test for the ISW effect in the Southern Hemisphere. Monthly Notices of the Royal Astronomical Society, 493(4), 4830-4844. https://doi.org/10.1093/mnras/staa592The Integrated Sachs-Wolfe (ISW) effect probes the late-time expansion history of the universe, offering direct constraints on dark energy. Here we present our measurements of the ISW signal at redshifts of z¯=0.35, 0.55 and 0.68, using the cross-co... Read More about Cross-correlating Planck with VST ATLAS LRGs: a new test for the ISW effect in the Southern Hemisphere.
Local Hole revisited: evidence for bulk motions and self-consistent outflow (2019)
Journal Article
Shanks, T., Hogarth, L., Metcalfe, N., & Whitbourn, J. (2019). Local Hole revisited: evidence for bulk motions and self-consistent outflow. Monthly Notices of the Royal Astronomical Society, 490(4), 4715-4720. https://doi.org/10.1093/mnras/stz2863We revisit our mapping of the ‘Local Hole’, a large underdensity in the local galaxy redshift distribution that extends out to redshift, z ≈ 0.05 and a potential source of outflows that may perturb the global expansion rate and thus help mitigate the... Read More about Local Hole revisited: evidence for bulk motions and self-consistent outflow.
Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey (2019)
Journal Article
Liu, T., Gezari, S., Ayers, M., Burgett, W., Chambers, K., Hodapp, K., Huber, M., Kudritzki, R.-P., Metcalfe, N., Tonry, J., Wainscoat, R., & Waters, C. (2019). Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey. Astrophysical Journal, 884(1), Article 36. https://doi.org/10.3847/1538-4357/ab40cbWe present a systematic search for periodically varying quasar and supermassive black hole binary (SMBHB) candidates in the Pan-STARRS1 Medium Deep Survey (MDS). From ~9000 color-selected quasars in an ~50 °2 sky area, we initially identify 26 candid... Read More about Supermassive Black Hole Binary Candidates from the Pan-STARRS1 Medium Deep Survey.
Changing-look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars (2019)
Journal Article
MacLeod, C. L., Green, P. J., Anderson, S. F., Bruce, A., Eracleous, M., Graham, M., …Metcalfe, N. (2019). Changing-look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars. Astrophysical Journal, 874(1), Article 8. https://doi.org/10.3847/1538-4357/ab05e2Active galactic nuclei (AGNs) that show strong rest-frame optical/UV variability in their blue continuum and broad line emission are classified as changing-look AGN, or at higher luminosities, changing-look quasars (CLQs). These surprisingly large an... Read More about Changing-look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars.
Precision Distances to Dwarf Galaxies and Globular Clusters from Pan-STARRS1 3π RR Lyrae (2019)
Journal Article
Hernitschek, N., Cohen, J. G., Rix, H.-W., Magnier, E., Metcalfe, N., Wainscoat, R., Waters, C., Kudritzki, R.-P., & Burgett, W. (2019). Precision Distances to Dwarf Galaxies and Globular Clusters from Pan-STARRS1 3π RR Lyrae. Astrophysical Journal, 871(1), Article 49. https://doi.org/10.3847/1538-4357/aaf388We present new spatial models and distance estimates for globular clusters and dwarf spheroidals orbiting our Galaxy based on RR Lyrae (RRab) stars in the Pan-STARRS1 (PS1) 3π survey. Using the PS1 sample of RRab stars from Sesar et al. in 16 globula... Read More about Precision Distances to Dwarf Galaxies and Globular Clusters from Pan-STARRS1 3π RR Lyrae.
Gaia Cepheid parallaxes and ‘Local Hole’ relieve H0 tension (2018)
Journal Article
Shanks, T., Hogarth, L., & Metcalfe, N. (2019). Gaia Cepheid parallaxes and ‘Local Hole’ relieve H0 tension. Monthly Notices of the Royal Astronomical Society: Letters, 484(1), L64-L68. https://doi.org/10.1093/mnrasl/sly239There is an ≈9 ± 2.5 per cent tension between the value of Hubble’s Constant, H0 = 67.4 ± 0.5 km s−1 Mpc−1, implied by the Planck microwave background power spectrum and that given by the distance scale of H0 = 73.4 ± 1.7 km s−1Mpc−1. But with a plau... Read More about Gaia Cepheid parallaxes and ‘Local Hole’ relieve H0 tension.