رسالة جامعية

Exploring the environments and host galaxies of SGRB progenitors in the era of multi-messenger astronomy

التفاصيل البيبلوغرافية
العنوان: Exploring the environments and host galaxies of SGRB progenitors in the era of multi-messenger astronomy
المؤلفون: Mandhai, Soheb
بيانات النشر: University of Leicester, 2022.
سنة النشر: 2022
المجموعة: University of Leicester
مصطلحات موضوعية: astronomy, host galaxies, Space Science, compact binaries, cosmos, gravitational waves, SGRBs, short gamma-ray bursts, neutron stars, GW170817, giant flares, soft gamma-ray repeaters, black holes, multi-messenger astrophysics, GW detectors, binaries, Cosmological simulation, trace galaxy dynamics, galaxies, redshifts, electromagnetic counterparts, Local Universe, kilonovae, Neutron Star mergers, universe, astrophysics, Gravitational wave sources, Thesis
الوصف: The in-spiral of compact binary systems consisting of a neutron star paired with either a black-hole or another neutron star produces distortions in space-time known as gravitational waves (GW). In the presence of sufficient ejecta, electromagnetic phenomena such as short-duration gamma-ray bursts (SGRBs) or kilonovae can be produced. In this thesis, I explore the environments, redshifts, and host galaxy demographics of these compact binaries. Using my Redshift Electromagnetic Localisation and Deduction Algorithm (zELDA), I seed BPASS and COSMIC evolved binaries into hydro-dynamical galaxies from the EAGLE simulation. I then trace the orbits of the binaries until they merge. I apply a selection criterion to a simulated SGRB sample to gauge the consistency with observations. I find agreements with the observed redshifts, host galaxy demographics, and offsets. I predict 16 -40% of SGRB events would appear "host-less", i.e. sources that merge with high impact parameters or have faint hosts (H > 26). Given the close proximity of GW170817 at ~ 40Mpc, I consider the constraints on a local population of low-luminosity SGRBs. I gauge the likelihood of SGRBs with host galaxies within < 200Mpc. I get an all-sky rate of < 6 yr⁻¹ using well-localised bursts (with precisions of ~ arcmin - arcsec) from 'Swift'/BAT, corresponding to ~ 8% of 'Swift' SGRBs. By cross-correlating poorly localised bursts from the CGRO/BATSE and Fermi/GBM with galaxies within < 100Mpc, I find a weaker constraint of £ 12 yr⁻¹ for the all-sky rate. I conduct a separate search to constrain the rate of nearby (d < 11Mpc) giant flares from Soft Gamma-Ray Repeaters (SGRs) and place an upper limit of < 3 yr⁻¹. I conclude this thesis by commenting on the implications of our findings on future studies.
نوع الوثيقة: Electronic Thesis or Dissertation
اللغة: English
DOI: 10.25392/leicester.data.19345469.v1
الوصول الحر: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.850051Test
رقم الانضمام: edsble.850051
قاعدة البيانات: British Library EThOS
الوصف
DOI:10.25392/leicester.data.19345469.v1