Hannah Dalgleish
A5080107425- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Conferences and Exhibitions Management
- Impact of Light on Environment and Health
- Stellar, planetary, and galactic studies
- History and Developments in Astronomy
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Space exploration and regulation
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Space Science and Extraterrestrial Life
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- COVID-19 Clinical Research Studies
- Cruise Tourism Development and Management
- Pulsars and Gravitational Waves Research
- Career Development and Diversity
- Conservation, Ecology, Wildlife Education
- CCD and CMOS Imaging Sensors
- Diverse Aspects of Tourism Research
- Thermal Regulation in Medicine
University of Oxford
2019-2024
University of Southampton
2024
Manchester University NHS Foundation Trust
2024
University of Namibia
2019-2022
Heidelberg University
2021
Deutsches Elektronen-Synchrotron DESY
2021
Friedrich-Alexander-Universität Erlangen-Nürnberg
2021
North-West University
2021
Max Planck Institute for Astronomy
2021
Liverpool John Moores University
2018-2020
We compare the results of a large grid N-body simulations with surface brightness and velocity dispersion profiles globular clusters $\omega$ Cen NGC 6624. Our models include varying stellar-mass black hole retention fractions masses central intermediate-mass (IMBH). find that an $\sim 45,000$ M$_\odot$ IMBH, whose presence has been suggested based on measured profile Cen, predicts existence about 20 fast-moving, $m>0.5$ main-sequence stars (1D) $v>60$ km/sec in arcsec Cen. However no such...
Cosmological and astrophysical observations suggest that 85% of the total matter Universe is made Dark Matter (DM). However, its nature remains one most challenging fundamental open questions particle physics. Assuming DM, this exotic form cannot consist Standard Model (SM) particles. Many models have been developed to attempt unraveling DM such as Weakly Interacting Massive Particles (WIMPs), favored candidates. WIMP annihilations decay could produce SM particles which in turn hadronize...
Using data from the WiFeS Atlas of Galactic Globular cluster Spectra we study behaviour calcium triplet (CaT), a popular metallicity indicator in extragalactic stellar population studies. A major caveat these studies is that potential sensitivity to other parameters such as age, abundance and initial mass function has not yet been empirically evaluated. Here present measurements strength CaT feature for 113 globular clusters Milky Way its satellite galaxies. We derive empirical calibrations...
Observed mass-to-light ratios (M/L) of metal-rich globular clusters (GCs) disagree with theoretical predictions. This discrepancy is fundamental importance since stellar population models provide the masses that underpin most extragalactic astronomy, near and far. We have derived radial velocities for 1,622 stars located in centres 59 Milky Way GCs - twelve which no previous kinematic information using integral-field unit data from WAGGS project. Using N-body models, we then determine...
Stellar feedback plays a fundamental role in shaping the evolution of galaxies. Here we explore use ionised gas kinematics young, bipolar H II regions as probe early these star-forming environments. We have undertaken multiwavelength study region Galactic disc, G$316.81-0.06$, which lies at centre massive ($\sim10^3$ M$_{\odot}$) infrared-dark cloud filament. It is still accreting molecular well driving $\sim 0.2$ pc outflow perpendicular to Intriguingly, observe large velocity gradient...
Primordial Black Holes are expected to be formed in the early Universe by gravitational collapse of overdense regions, among other mechanisms. They also loose their mass over time Hawking radiation process. As rates this increase with temperature, PBH evaporation should result a violent explosion. The current upper limits on explosion order $10^4-10^5 pc^{-3}yr^{-1}$. In contribution we'll present results search for TeV $\gamma$-ray burst within timescale few seconds, using nearly 5000 hours...
Abstract Hannah Dalgleish examines ways in which astronomy can help to forge a sustainable future for life on Earth.
Highly extended gamma-ray emission around the Geminga pulsar was discovered by Milagro and verified HAWC. Despite many observations with Imaging Atmospheric Cherenkov Telescopes (IACTs), detection of on angular scales exceeding IACT field-of-view has proven challenging. Recent developments in analysis techniques have enabled significant archival data H.E.S.S.. In 2019, further region were obtained an adapted observation strategy. Following announcement TeV data, this contribution we present...
In October 2019 the central 28m telescope of H.E.S.S. experiment has been upgraded with a new camera. The camera is based on FlashCam design which developed in view possible future implementation medium-sized telescopes Cherenkov Telescope Array (CTA). We report here results science verification program that performed after commissioning camera, to show and software pipelines are working up expectations.
Travel to academic conferences -- where international flights are the norm is responsible for a sizeable fraction of greenhouse gas (GHG) emissions associated with work. In order provide benchmark comparison other fields, as well future reduction strategies and assessments, we estimate CO2-equivalent conference travel in field astronomy prepandemic year 2019. The GHG emission astronomical community's 362 schools 2019 amounted 42,500 tCO2e, assuming radiative-forcing index factor 1.95 air...
The Fermi Bubbles were discovered about a decade ago in the Fermi-LAT data as double-lobe structure extending up to 55° Galactic latitudes above and below Center. At moment their origin is still unknown. H.E.S.S. collaboration currently performing first ever survey TeV gamma rays of Milky Way inner region: Inner Galaxy Survey. This intended achieve best sensitivity faint diffuse emissions region several degrees around Centre. It provides an unprecedented dark matter signals, new emissions,...
Abstract Cosmological N -body simulations show that Milky Way–sized galaxies harbor a population of unmerged dark matter (DM) subhalos. These subhalos could shine in gamma-rays and eventually be detected gamma-ray surveys as unidentified sources. We performed thorough selection among Fermi-Large Area Telescope Objects (UFOs) to identify them possible tera-electron-volt-scale DM subhalo candidates. search for very-high-energy (E ≳ 100 GeV) emissions using H.E.S.S. observations toward four...
The identification of active PeVatrons, hadronic particle accelerators reaching the knee cosmic-ray spectrum (at energy few PeV), is crucial to understand origin cosmic rays in Galaxy. In this context, we report on new H.E.S.S. observations PeVatron candidate HESS J1702-420, which bring evidence for presence γ-rays up 100 TeV. This first time history that photons with such high are observed. Remarkably, deep allowed discovery a γ-ray source component, called J1702-420A, was previously hidden...
Namibia is world-renowned for its incredibly dark skies by the astronomy community, and yet, country not well recognised as a sky destination tourists travellers. Forged collaboration between Universities of Oxford Namibia, together we are using means capacity-building sustainable socio-economic growth via educating tour guides promoting tourism to relevant stakeholders.
Kepler’s supernova remnant (SNR) which is produced by the most recent naked-eye in our Galaxy one of best studied SNRs, but its gamma-ray detection has eluded us so far. Observations with modern imaging atmospheric Cherenkov telescopes (IACT) have enlarged knowledge about nearby SNRs ages younger than 500 years establishing Cassiopeia A and Tycho’s as very high energy (VHE) sources setting a lower limit on distance to SNR. This SNR significantly more distant other two expected be faintest...
Cosmic Ray (CR) interactions with the dense gas inside Giant Molecular Clouds (GMCs) produce neutral pions, which in turn decay into gamma rays. Thus, ray emission from GMCs is a direct tracer of cosmic density and matter clouds. Detection enhanced TeV GMCs, i.e., an significantly larger than what expected average Galactic rays illuminating cloud, can imply variation local density, due to, for example, presence recent accelerator proximity to cloud. Such gamma-ray observations be crucial...
Detecting and studying galactic gamma-ray sources emitting very-high energy photons sheds light on the acceleration propagation of cosmic rays presumably created in these sources. Currently, there are few with energies exceeding 100 TeV. In this work we revisit unidentified source MGRO J1908+06, initially detected by Milagro, using an updated H.E.S.S. dataset analysis pipeline. The vicinity contains a supernova remnant pulsars as well molecular clouds. This makes identification primary...
Astrotourism brings new opportunities to generate sustainable socio-economic development, preserve cultural heritage, and inspire educate the citizens of globe. This form tourism can involve many different activities, such as visiting observatories or travelling remote areas experience an evening under a pristine, dark night sky. Together, our UK-Namibian collaboration is working develop showcase astrotourism in Namibia, enhance possibility for worldwide.
Abstract The International Astronomical Youth Camp (IAYC) is an astronomy education outreach event with more than 50 yr of history and over 1700 unique participants from 81 nationalities. Workshop for Astronomy e.V. the non-profit organization behind IAYC, established in 1979 based Germany. IAYC’s unprecedented longevity a rapidly globalizing world has meant that financial inequities decreases reach camp to people Global South compared North countries. Though nationalities represented per...