Sophia R. Flury
A5015374398- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Radioactive contamination and transfer
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Nuclear physics research studies
- Impact of Light on Environment and Health
- Relativity and Gravitational Theory
- Nuclear Physics and Applications
- Isotope Analysis in Ecology
- Space Exploration and Technology
- Astrophysics and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Pulsars and Gravitational Waves Research
- Astronomical and nuclear sciences
Ludwig-Maximilians-Universität München
2024
Pennsylvania State University
2024
University of Massachusetts Amherst
2020-2024
Abstract The origins of Lyman continuum (LyC) photons responsible for the reionization universe are as yet unknown and highly contested. Detecting LyC from Epoch Reionization is not possible due to absorption by intergalactic medium, which has prompted development several indirect diagnostics infer rate at galaxies contribute reionize studying lower-redshift analogs. We present Low-redshift Continuum Survey (LzLCS) comprising measurements made with Hubble Space Telescope Cosmic Origins...
The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z {\gtrsim} 6) due to intergalactic H I absorption. To identify emitters (LCEs) and infer fraction escaping LyC, astronomers have developed various indirect diagnostics LyC escape. Using measurements from Low-redshift Continuum Survey (LzLCS), we present first statistical test these diagnostics. While optical depth indicators based on Lyα, such as peak velocity separation equivalent width, perform well, also find that...
ABSTRACT Most of the hydrogen in intergalactic medium (IGM) was rapidly ionized at high redshifts. While observations have established that reionization occurred, observational constraints on high-redshift ionizing emissivity remain elusive. Here, we present a new analysis Low-redshift Lyman Continuum Survey (LzLCS) and literature observations, combined sample 89 star-forming galaxies redshifts near 0.3 with Hubble Space Telescope their continua (or Continuum, LyC). We find strong (6σ...
Combining 66 ultraviolet (UV) spectra and ancillary data from the Low-Redshift Lyman Continuum Survey (LzLCS) 23 LyC observations by earlier studies, we form a statistical sample of star-forming galaxies at $z \sim 0.3$ to study role cold interstellar medium (ISM) gas in leakage ionizing radiation. We first constrain massive star content (ages metallicities) UV attenuation, fitting stellar continuum with combination simple population models. The models, together accurate flux measurements,...
ABSTRACT We present an analysis of the ultraviolet (UV) continuum slopes (β) for a sample 172 galaxy candidates at 8 < zphot 16 selected from combination JWST NIRCam imaging and COSMOS/UltraVISTA ground-based near-infrared imaging. Focusing primarily on new 121 galaxies 〈z〉 ≃ 11 320 arcmin2 public data across 15 independent sets, we investigate evolution β in population z ≥ 9. find significant trend between redshift, with inverse-variance weighted mean UV slope evolving 〈β〉 = −2.17 ±...
Context. One of the surprising early findings with JWST has been discovery a strong “roll-over” or softening absorption edge Ly α in large number galaxies at z ≳ 6, addition to systematic offsets from photometric redshift estimates and fundamental galaxy scaling relations. This interpreted as cumulative damped (DLA) wings high column densities neutral atomic hydrogen (H I ), signifying major gas accretion events formation these galaxies. Aims. To explore this new phenomenon systematically,...
We report observational evidence of highly turbulent ionized gas kinematics in a sample 20 Lyman continuum (LyC) emitters (LCEs) at low redshift ( z ∼ 0.3). Detailed Gaussian modeling optical emission line profiles high-dispersion spectra consistently shows that both bright recombination and collisionally excited lines can be fitted as one or two narrow components with intrinsic velocity dispersion σ 40 − 100 km s −1 , addition to broader component 300 which contributes up ∼40% the total...
Abstract Ultraviolet absorption line spectroscopy is a sensitive diagnostic for the properties of interstellar and circumgalactic gas. Down-the-barrel observations, where measured against galaxy itself, are commonly used to study feedback from galactic outflows make predictions about leakage H i ionizing photons into intergalactic medium. Nonetheless, interpretation these observations challenging, observational compromises often made in terms signal-to-noise ratio, spectral resolution, or...
Abstract Star-forming galaxies are considered the likeliest source of H i ionizing Lyman continuum (LyC) photons that reionized intergalactic medium at high redshifts. However, above z ≳ 6, neutral prevents direct observations LyC. Therefore, recent years have seen development indirect indicators for LyC can be calibrated lower redshifts and applied in epoch reionization. Emission from Mg ii λλ 2796, 2803 doublet has been proposed as a promising proxy. In this paper, we present new Hubble...
The geometry of the neutral gas in and around galaxies is a key regulator escape ionizing photons. We present first statistical study aimed at linking ionized distributions to Lyman continuum (LyC) fraction ( f esc LyC ) sample 22 confirmed leakers non-leakers z ≈ 0.35 using Keck Cosmic Web Imager (Keck/KCWI) Low Resolution Spectrograph 2 (HET/LRS2). Our integral field unit data enable detection low-ionization gas, as traced by Mg II , [O ], extending beyond stellar for seven ten objects,...
Abstract To understand how galaxies reionized the Universe, we must determine escape fraction of Lyman continuum (LyC) photons ( f esc ) depends on galaxy properties. Using z ∼ 0.3 Low-redshift Continuum Survey (LzLCS), develop and analyze new multivariate predictors . These predictions use Cox proportional hazards model, a survival analysis technique that incorporates both detections upper limits. Our best model predicts LzLCS with an rms scatter 0.31 dex, better than single-variable...
ABSTRACT Here, we present high spectral resolution ${\it JWST}$ NIRSpec observations of GN 42437, a low-mass (log(M$_\ast /{\rm M}_\odot)=7.9$), compact ($r_e \lt 500$pc), extreme starburst galaxy at $z=5.59$ with 13 emission-line detections. 42437 has low metallicity (5–10 per cent Z$_\odot$) and its rest-frame H$\alpha$ equivalent width suggests nearly all the observed stellar mass formed within last 3 Myr. an extraordinary 7$\sigma$ significant [Ne v] 3427 Å detection. The line $11\pm...
Abstract JWST is uncovering the properties of ever-increasing numbers galaxies at z > 6, during epoch reionization. Connecting these observed populations to process reionization requires understanding how efficiently they produce Lyman continuum (LyC) photons and what fraction ( f esc ) escape into intergalactic medium. By applying Cox proportional hazards model, a survival analysis technique, Low-redshift Continuum Survey (LzLCS), we develop new, empirical, multivariate predictions for ....
Abstract Feedback is widely recognized as an essential condition for Lyman continuum (LyC) escape in star-forming galaxies. However, the mechanisms by which galactic outflows clear neutral gas and dust remain unclear. In this paper, we model Mg ii 2796 Å, 2804 Å absorption emission lines 29 galaxies taken from Low- z LyC Survey to investigate impact of (radiation mechanical) feedback on escape. Using constraints + photoionization models, map outflows’ hydrogen content predict <mml:math...
For the first time, sulphur abundance relative to hydrogen (S/H) in Narrow Line Regions of a sample Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation electron temperature. emission line intensities from SDSS DR17 [in wavelength range 3000 < $\lambda$ 9100] and literature for 45 nearby ($z$ 0.08) Sy 2s were considered. Our estimates indicate that have similar temperatures gas region where most S+ ions are located comparison with star-forming regions (SFs). However, present...
The Sloan Digital Sky Survey (SDSS) has proved to be a powerful resource for understanding the physical properties and chemical composition of star-forming galaxies in local universe. SDSS population active galactic nuclei (AGN) remains as yet less explored this capacity. To extend rigorous study \ion{H}{ii} regions AGN, we adapt methods computing direct-method abundances application narrow-line (NLR) AGN. By accounting triply-ionized oxygen, are able more completely estimate total oxygen...
The properties that govern the production and escape of hydrogen ionizing photons (Lyman continuum, LyC; with energies >13.6 eV) in star-forming galaxies are still poorly understood, but they key to identifying characterizing sources reionized Universe. Here we empirically explore relationship between hardness radiation LyC leakage a large sample low-$z$ from recent Hubble Space Telescope Low-$z$ Lyman Continuum Survey. Using Sloan Digital Sky Survey stacks deep XShooter observations,...
One of the surprising early findings with JWST has been discovery a strong "roll-over" or softening absorption edge Ly$\alpha$ in large number galaxies at ($z\gtrsim 6$), addition to systematic offsets from photometric redshift estimates and fundamental galaxy scaling relations. This interpreted as damped (DLA) wings high column densities neutral atomic hydrogen (HI), signifying major gas accretion events formation these galaxies. To explore this new phenomenon systematically, we assemble...
Context. Sources that leak Lyman continuum (LyC) photons and lead to the reionisation of universe are an object intense study using multiple observing facilities. Recently, Low-redshift LyC Survey (LzLCS) has presented first large sample emitting galaxies at low redshift ( z ∼ 0.3) with Hubble Space Telescope Cosmic Origins Spectrograph. The LzLCS contains a robust estimate escape fraction f esc ) for 66 galaxies, spanning wide range values. Aims. Here, we aim dependence on radio (RC)...
We derive the nitrogen and oxygen abundances in Narrow Line Regions (NLRs) of a sample 38 local ($z \: < 0.4$) Seyfert~2 nuclei. For that, we consider narrow optical emission line intensities direct estimates electron temperatures ($T_{\rm e}$-method). find range $7.6 \rm 12+log(N/H) 8.6$ (mean value $8.06\pm0.22$) or $\rm 0.4 (N/N_{\odot}) 4.7$, metallicity regime $8.3 12+log(O/H) 9.0$. Our results indicate that dispersion N/H abundance for fixed O/H AGNs is agreement with disc \ion{H}{ii}...
The fraction of ionizing photons escaping from galaxies, $f_{esc}$, is at the same time a crucial parameter in modelling reionization and very poorly known quantity, especially high redshift. Recent observations are starting to constrain values $f_{esc}$ low-z star-forming but validity this comparison remains be verified. Applying high-z empirical relation between UV slope trends derived Low-z Lyman Continuum Survey, we use DELPHI semi-analytical galaxy formation model estimate global...
We report observational evidence of highly turbulent ionized gas kinematics in a sample 20 Lyman continuum (LyC) emitters (LCEs) at low redshift ($z\sim 0.3$). Detailed Gaussian modeling optical emission line profiles high-dispersion spectra consistently shows that both bright recombination and collisionally excited lines can be fitted as one or two narrow components with intrinsic velocity dispersion $σ\sim$40-100 km s$^{-1}$, on top broader component $σ\sim$100-300 which contributes up to...
The geometry of the neutral gas in and around galaxies is a key regulator escape ionizing photons. We present first statistical study aiming at linking ionized distributions to Lyman continuum (LyC) fraction (fesc(LyC)) sample 22 confirmed LyC leakers non-leakers z~0.35 using Keck Cosmic Web Imager (Keck/KCWI) Low Resolution Spectrograph 2 (HET/LRS2). Our integral field unit data enable detection low-ionization gas, as traced by Mg II, [O II], extending beyond stellar for 7 10 objects,...