Dr Nigel Metcalfe's Outputs (4)

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/stz2863

We 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., …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/ab40cb

We 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/ab05e2

Active 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., Magnier, E., Metcalfe, N., Wainscoat, R., …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/aaf388

We 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.