T. M. Brown
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View article: Comparison of Two Miniaturized, Rectifiable Aerosol Photometers for Personal PM2.5 Monitoring in a Dusty Occupational Environment
Comparison of Two Miniaturized, Rectifiable Aerosol Photometers for Personal PM2.5 Monitoring in a Dusty Occupational Environment Open
Wearable, rectifiable aerosol photometers (WRAPs), instruments with combined nephelometer and on-board filter-based sampling capabilities, generally show strong correlations with reference instruments across a range of ambient and househol…
View article: Broad-spectrum antibacterial properties of a Pseudomonas field isolate and potential rhizomicrobiome implications
Broad-spectrum antibacterial properties of a Pseudomonas field isolate and potential rhizomicrobiome implications Open
Plant growth promoting bacteria (PGPB) such as Pseudomonas have been widely acclaimed for their roles in sustainable food production and consumption of pollutants in contaminated soils. Yet, we still have much to learn about how dynamics o…
View article: OGLE-2011-BLG-0462: An Isolated Stellar-mass Black Hole Confirmed Using New HST Astrometry and Updated Photometry
OGLE-2011-BLG-0462: An Isolated Stellar-mass Black Hole Confirmed Using New HST Astrometry and Updated Photometry Open
The long-duration Galactic-bulge microlensing event OGLE-2011-BLG-0462 produced relativistic astrometric deflections of the source star, which we measured using Hubble Space Telescope (HST) observations taken at eight epochs over ∼6 yr. An…
View article: The Hubble Space Telescope Survey of M31 Satellite Galaxies. IV. Survey Overview and Lifetime Star Formation Histories
The Hubble Space Telescope Survey of M31 Satellite Galaxies. IV. Survey Overview and Lifetime Star Formation Histories Open
From >1000 orbits of HST imaging, we present deep homogeneous resolved star color–magnitude diagrams that reach the oldest main-sequence turnoff and uniformly measured star formation histories (SFHs) of 36 dwarf galaxies (−6 ≥ M V ≥ −17) a…
Groups of type $FP$ via graphical small cancellation Open
We construct an uncountable family of groups of type FP . In contrast to every previous construction of non-finitely presented groups of type FP , we do not use Morse theory on cubical complexes; instead, we use Gromov’s graphical small ca…
View article: Shift and night work in the fourth decade is associated with reduced brain volume in late life independent of amyloidogenic pathways: an Insight 46 study
Shift and night work in the fourth decade is associated with reduced brain volume in late life independent of amyloidogenic pathways: an Insight 46 study Open
Background Sleep and circadian disruption are associated with increased dementia risk, yet the mechanism remains poorly understood. We examined the relationship between night/shift working in the fourth decade and late‐life brain health. W…
Updating the study protocol: Insight 46 – a longitudinal neuroscience sub-study of the MRC National Survey of Health and Development – phases 2 and 3 Open
Background Although age is the biggest known risk factor for dementia, there remains uncertainty about other factors over the life course that contribute to a person’s risk for cognitive decline later in life. Furthermore, the pathological…
View article: White matter hyperintensity volume changes are associated with progressive hippocampal atrophy in Insight 46: the neuroscience sub‐study of the MRC National Survey of Health and Development, the British 1946 birth cohort
White matter hyperintensity volume changes are associated with progressive hippocampal atrophy in Insight 46: the neuroscience sub‐study of the MRC National Survey of Health and Development, the British 1946 birth cohort Open
Background White matter hyperintensity volume (WMHV) is a presumed marker of cerebrovascular disease associated with ageing, Alzheimer’s disease (AD) and vascular dementia. Higher baseline WMHV is associated with increased brain atrophy ra…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIV. Differences in Internal Kinematics of Multiple Stellar Populations Open
Our understanding of the kinematic properties of multiple stellar populations (mPOPs) in Galactic globular clusters (GCs) is still limited compared to what we know about their chemical and photometric characteristics. Such limitation arise…
Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO<sub>3</sub>–BaTiO<sub>3</sub> ceramics Open
Re-entrant relaxor ferroelectric behaviour is identified in BiFeO 3 –BaTiO 3 ceramics, yielding anomalous thermal variations in structural distortion and functional properties.
Timing the r-Process Enrichment of the Ultra-Faint Dwarf Galaxy Reticulum II Open
The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with 72 +10/-12% of its stars strongly enhanced in r-process elements. We present deep Hubble Space Telescope photometry of Ret II and analyze…
View article: An isolated stellar-mass black hole detected through astrometric microlensing
An isolated stellar-mass black hole detected through astrometric microlensing Open
We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (tE ≃ 270 days), h…
Relative Ages of Nine Inner Milky Way Globular Clusters from Proper-motion-cleaned Color–Magnitude Diagrams* Open
Our picture of the age–metallicity relation for Milky Way globular clusters (MWGCs) is still highly incomplete, and the majority of MWGCs lack self-consistent age measurements. Here, we exploit deep, homogenous multiepoch Hubble Space Tele…
Eridanus II: A Fossil from Reionization with an Off-center Star Cluster Open
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of M V = −7.1, is located at a distance of 339 kpc, just beyond the virial radius of the …
Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters* Open
This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located toward the inner Milky Way bulge and disk. Here, we focus on internal kinematics of nine GGCs, obtained from space-…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters – XXI. Binaries among multiple stellar populations Open
A number of scenarios for the formation of multiple populations in globular clusters (GCs) predict that second generation (2G) stars form in a compact and dense subsystem embedded in a more extended first-generation (1G) system. If these s…
Astro2020 Science White Paper: Construction of an L* Galaxy: the\n Transformative Power of Wide Fields for Revealing the Past, Present and\n Future of the Great Andromeda System Open
The Great Andromeda Galaxy (M31) is the nexus of the near-far galaxy\nevolution connection and a principal data point for near-field cosmology. Due\nto its proximity (780 kpc), M31 can be resolved into individual stars like the\nMilky Way …
Astro2020 Science White Paper: Construction of an L* Galaxy: the Transformative Power of Wide Fields for Revealing the Past, Present and Future of the Great Andromeda System Open
The Great Andromeda Galaxy (M31) is the nexus of the near-far galaxy evolution connection and a principal data point for near-field cosmology. Due to its proximity (780 kpc), M31 can be resolved into individual stars like the Milky Way (MW…
View article: Star cluster catalogues for the LEGUS dwarf galaxies
Star cluster catalogues for the LEGUS dwarf galaxies Open
We present the star cluster catalogues for 17 dwarf and irregular galaxies in the HST Treasury Program ‘Legacy ExtraGalactic UV Survey’ (LEGUS). Cluster identification and photometry in this sub-sample are similar to that of the entire LEG…
The Hubble Space Telescope UV legacy survey of galactic globular clusters – XVI. The helium abundance of multiple populations Open
Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy\nSurvey of Galactic Globular Clusters (GCs), has revealed that all the analyzed\nclusters host two groups of first- (1G) and second-generation (2G) stars. In\nmost …
A High-precision Trigonometric Parallax to an Ancient Metal-poor Globular Cluster<sup>∗</sup> Open
Using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope ( HST ), we have obtained a direct trigonometric parallax for the nearest metal-poor globular cluster, NGC 6397. Although trigonometric parallaxes have been previously meas…
Analysis of models for viscoelastic wave propagation Open
We consider the problem of waves propagating in a viscoelastic solid. For the material properties of the solid we consider both classical and fractional differentiation in time versions of the Zener, Maxwell, and Voigt models, where the co…
View article: Extinction Maps and Dust-to-gas Ratios in Nearby Galaxies with LEGUS
Extinction Maps and Dust-to-gas Ratios in Nearby Galaxies with LEGUS Open
We present a study of the dust-to-gas ratios in five nearby galaxies: NGC 628 (M74), NGC 6503, NGC 7793, UGC 5139 (Holmberg I), and UGC 4305 (Holmberg II). Using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Tre…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters – XIII. ACS/WFC parallel-field catalogues Open
As part of the Hubble Space Telescope UV Legacy Survey of Galactic Globular\nClusters, 110 parallel fields were observed with the Wide Field Channel of the\nAdvanced Camera for Surveys, in the outskirts of 48 globular clusters, plus the\no…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters – XII. The RGB bumps of multiple stellar populations Open
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters is providing a major breakthrough in our knowledge of globular clusters (GCs) and their stellar populations. Among the main results, we discovered that all the studi…
Relativistic deflection of background starlight measures the mass of a nearby white dwarf star Open
General relativity weighs a white dwarf Light from a background star is deflected by the gravitational field of the Sun. This effect was used in 1919 to provide some of the first evidence for general relativity. Sahu et al. applied the con…