Search Results for author: Daniel J. Mortlock

Found 7 papers, 7 papers with code

Bayesian constraints on the astrophysical neutrino source population from IceCube data

1 code implementation5 May 2020 Francesca Capel, Daniel J. Mortlock, Chad Finley

We present constraints on an astrophysical population of neutrino sources imposed by recent data from the IceCube neutrino observatory.

High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics

Unbiased Hubble constant estimation from binary neutron star mergers

1 code implementation28 Nov 2018 Daniel J. Mortlock, Stephen M. Feeney, Hiranya V. Peiris, Andrew R. Williamson, Samaya M. Nissanke

Gravitational wave (GW) observations of binary neutron star (BNS) mergers can be used to measure luminosity distances and hence, when coupled with estimates for the mergers' host redshifts, infer the Hubble constant, $H_0$.

Cosmology and Nongalactic Astrophysics

Impact of using the ultra-high-energy cosmic ray arrival energies to constrain source associations

1 code implementation15 Nov 2018 Francesca Capel, Daniel J. Mortlock

We present a Bayesian hierarchical model which enables a joint fit of the ultra-high-energy cosmic ray (UHECR) energy spectrum and arrival directions within the context of a physical model for the UHECR phenomenology.

High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics

Inferring properties of the local white dwarf population in astrometric and photometric surveys

1 code implementation1 Aug 2018 Axel Widmark, Daniel J. Mortlock, Hiranya V. Peiris

With such a large data set, it is possible to infer properties of the WD population using only astrometric and photometric information.

Solar and Stellar Astrophysics

Prospects for resolving the Hubble constant tension with standard sirens

1 code implementation9 Feb 2018 Stephen M. Feeney, Hiranya V. Peiris, Andrew R. Williamson, Samaya M. Nissanke, Daniel J. Mortlock, Justin Alsing, Dan Scolnic

The Hubble constant ($H_0$) estimated from the local Cepheid-supernova (SN) distance ladder is in 3-$\sigma$ tension with the value extrapolated from cosmic microwave background (CMB) data assuming the standard cosmological model.

Cosmology and Nongalactic Astrophysics

Clarifying the Hubble constant tension with a Bayesian hierarchical model of the local distance ladder

1 code implementation30 Jun 2017 Stephen M. Feeney, Daniel J. Mortlock, Niccolò Dalmasso

Estimates of the Hubble constant, $H_0$, from the distance ladder and the cosmic microwave background (CMB) differ at the $\sim$3-$\sigma$ level, indicating a potential issue with the standard $\Lambda$CDM cosmology.

Cosmology and Nongalactic Astrophysics

Hierarchical Bayesian inference of galaxy redshift distributions from photometric surveys

1 code implementation18 Feb 2016 Boris Leistedt, Daniel J. Mortlock, Hiranya V. Peiris

We illustrate this technique on simulated galaxy survey data, and demonstrate that it delivers correct posterior distributions on the underlying type and redshift distributions, as well as on the individual types and redshifts of galaxies.

Cosmology and Nongalactic Astrophysics

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