Dr Nigel Metcalfe's Outputs (10)

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/sly239

There 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.

Cepheids in M31: The PAndromeda Cepheid Sample (2018)
Journal Article
Kodric, M., Riffeser, A., Hopp, U., Goessl, C., Seitz, S., Bender, R., …Wainscoat, R. (2018). Cepheids in M31: The PAndromeda Cepheid Sample. Astronomical Journal, 156(3), Article 130. https://doi.org/10.3847/1538-3881/aad40f

We present the largest Cepheid sample in M31 based on the complete Pan-STARRS1 survey of Andromeda (PAndromeda) in the r P1, i P1, and g P1 bands. We find 2686 Cepheids with 1662 fundamental-mode Cepheids, 307 first-overtone Cepheids, 278 type II Cep... Read More about Cepheids in M31: The PAndromeda Cepheid Sample.

Galactic reddening in 3D from stellar photometry – an improved map (2018)
Journal Article
Green, G. M., Schlafly, E. F., Finkbeiner, D., Rix, H., Martin, N., Burgett, W., …Waters, C. (2018). Galactic reddening in 3D from stellar photometry – an improved map. Monthly Notices of the Royal Astronomical Society, 478(1), 651-666. https://doi.org/10.1093/mnras/sty1008

We present a new 3D map of interstellar dust reddening, covering three quarters of the sky (declinations of δ ≳ −30°) out to a distance of several kiloparsecs. The map is based on high-quality stellar photometry of 800 million stars from Pan-STARRS 1... Read More about Galactic reddening in 3D from stellar photometry – an improved map.

The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs (2018)
Journal Article
Zhang, Z., Liu, M., Best, W., Magnier, E., Aller, K., Chambers, K., …Waters, C. (2018). The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs. Astrophysical Journal, 858(1), Article 41. https://doi.org/10.3847/1538-4357/aab269

We are conducting a proper-motion survey for young brown dwarfs in the Taurus-Auriga molecular cloud based on the Pan-STARRS1 3π Survey. Our search uses multi-band photometry and astrometry to select candidates, and is wider (370 deg2) and deeper (do... Read More about The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs.

Charge Diffusion Variations in Pan-STARRS1 CCDs (2018)
Journal Article
Magnier, E., Tonry, J., Finkbeiner, D., Schlafly, E., Burgett, W., Chambers, K., …Waters, C. (2018). Charge Diffusion Variations in Pan-STARRS1 CCDs. Publications of the Astronomical Society of the Pacific, 130(988), Article 065002. https://doi.org/10.1088/1538-3873/aaaad8

Thick back-illuminated deep-depletion CCDs have superior quantum efficiency over previous generations of thinned and traditional thick CCDs. As a result, they are being used for wide-field imaging cameras in several major projects. We use observation... Read More about Charge Diffusion Variations in Pan-STARRS1 CCDs.

Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters (2018)
Journal Article
Jones, D., Scolnic, D., Riess, A., Rest, A., Kirshner, R., Berger, E., …Smith, K. (2018). Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters. Astrophysical Journal, 857(1), Article 51. https://doi.org/10.3847/1538-4357/aab6b1

We use 1169 Pan-STARRS supernovae (SNe) and 195 low-z (z < 0.1) SNe Ia to measure cosmological parameters. Though most Pan-STARRS SNe lack spectroscopic classifications, in a previous paper we demonstrated that photometrically classified SNe can be u... Read More about Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters.

Two more, bright, z > 6 quasars from VST ATLAS and WISE (2018)
Journal Article
Chehade, B., Carnall, A., Shanks, T., Diener, C., Fumagalli, M., Findlay, J., …Gonzalez-Solares, E. (2018). Two more, bright, z > 6 quasars from VST ATLAS and WISE. Monthly Notices of the Royal Astronomical Society, 478(2), 1649-1659. https://doi.org/10.1093/mnras/sty690

Recently, Carnall et al. discovered two bright high redshift quasars using the combination of the VST ATLAS and WISE surveys. The technique involved using the 3-D colour plane i − z: z − W1: W1 − W2 with the WISE W1(3.4 micron) and W2 (4.5 micron) ba... Read More about Two more, bright, z > 6 quasars from VST ATLAS and WISE.

Color Variabilities of Spectrally Defined Red QSOs at z = 0.3–1.2 (2018)
Journal Article
Chen, I., Hwang, C., Kaiser, N., Magnier, E., Metcalfe, N., & Waters, C. (2018). Color Variabilities of Spectrally Defined Red QSOs at z = 0.3–1.2. Theory and Decision, 855(1), Article 66. https://doi.org/10.3847/1538-4357/aaab5b

We study the brightness and the color variabilities of 34 red and 122 typical quasi-stellar objects (QSOs) at z = 0.3–1.2 using data from the Pan-STARRS Medium Deep Survey. The red and the typical QSOs are selected based on the ratios of the flux den... Read More about Color Variabilities of Spectrally Defined Red QSOs at z = 0.3–1.2.

A Color-locus Method for Mapping R V Using Ensembles of Stars (2018)
Journal Article
Lee, A., Green, G. M., Schlafly, E. F., Finkbeiner, D. P., Burgett, W., Chambers, K., …Waters, C. (2018). A Color-locus Method for Mapping R V Using Ensembles of Stars. Astrophysical Journal, 854(2), Article 79. https://doi.org/10.3847/1538-4357/aaaa6d

We present a simple but effective technique for measuring angular variation in R V across the sky. We divide stars from the Pan-STARRS1 catalog into Healpix pixels and determine the posterior distribution of reddening and R V for each pixel using two... Read More about A Color-locus Method for Mapping R V Using Ensembles of Stars.

Hydrogen-poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey (2018)
Journal Article
Lunnan, R., Chornock, R., Berger, E., Jones, D., Rest, A., Czekala, I., …Willman, M. (2018). Hydrogen-poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey. Astrophysical Journal, 852(2), Article 81. https://doi.org/10.3847/1538-4357/aa9f1a

We present light curves and classification spectra of 17 hydrogen-poor superluminous supernovae (SLSNe) from the Pan-STARRS1 Medium Deep Survey (PS1 MDS). Our sample contains all objects from the PS1 MDS sample with spectroscopic classification that... Read More about Hydrogen-poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey.