124 citations · 249 across the 4 of their papers we have counts for
4 papers
Hydrostatic Gas Constraints on Supermassive Black Hole Masses: Implications for Hydrostatic Equilibrium and Dynamical Modelling in a Sample of Early-Type Galaxies
Philip J. Humphrey, David A. Buote, Fabrizio Brighenti +2
We present new mass measurements for the supermassive black holes (SMBHs) in the centres of three early-type galaxies. The gas pressure in the surrounding, hot interstellar medium…
Chi-square and Poissonian Data: Biases Even in the High-Count Regime and How to Avoid them
Philip J. Humphrey, Wenhao Liu, David A. Buote
We demonstrate that two approximations to the chi^2 statistic as popularly employed by observational astronomers for fitting Poisson-distributed data can give rise to intrinsically…
Low-Mass X-ray Binaries and Globular Clusters in Early-Type Galaxies. II. Globular Cluster Candidates and their Mass-Metallicity Relation
Philip J Humphrey
We present an astrometry and photometry catalogue of globular cluster (GC) candidates detected with HST WFPC2 in a sample of 19 early-type galaxies, appropriate for comparison to t…
Weighing the Quiescent Central Black Hole in an Elliptical Galaxy with X-ray Emitting Gas
Philip J. Humphrey, David A. Buote, Fabrizio Brighenti +2
We present a Chandra study of the hot ISM in the giant elliptical galaxy NGC4649. In common with other group-centred ellipticals, its temperature profile rises with radius in the o…