Christopher C. Lovell
YOU?
Author Swipe
View article: How Does Feedback Affect the Star Formation Histories of Galaxies?
How Does Feedback Affect the Star Formation Histories of Galaxies? Open
Star formation in galaxies is regulated by the interplay of a range of processes that shape the multiphase gas in the interstellar and circumgalactic media. Using the Cosmology and Astrophysics with MachinE Learning Simulations (CAMELS) su…
View article: Learning the Universe: cosmological and astrophysical parameter inference with galaxy luminosity functions and colours
Learning the Universe: cosmological and astrophysical parameter inference with galaxy luminosity functions and colours Open
We perform the first direct cosmological and astrophysical parameter inference from the combination of galaxy luminosity functions and colours using a simulation-based inference approach. Using the synthesizer code, we simulate the dust at…
View article: <tt>Cloudy-Maraston</tt> : integrating nebular continuum and line emission with the Maraston stellar population synthesis models
Cloudy-Maraston : integrating nebular continuum and line emission with the Maraston stellar population synthesis models Open
The James Webb Space Telescope has ushered in an era of abundant high-redshift observations of young stellar populations characterized by strong emission lines, motivating us to integrate nebular emission into the new Maraston stellar popu…
View article: Synthesizer: a Software Package for Synthetic Astronomical Observables
Synthesizer: a Software Package for Synthetic Astronomical Observables Open
We present Synthesizer, a fast, flexible, modular and extensible platform for modelling synthetic astrophysical observables. Synthesizer can be used for a number of applications, but is predominantly designed for generating mock observable…
View article: First light and reionization epoch simulations (FLARES) – XIX. Supermassive black hole mergers in the early Universe and their environmental dependence
First light and reionization epoch simulations (FLARES) – XIX. Supermassive black hole mergers in the early Universe and their environmental dependence Open
The upcoming space-based gravitational wave (GW) observatory, Laser Interferometer Space Antenna (LISA), is expected to detect GW signals from supermassive black hole (SMBH) mergers occurring at high redshifts. However, understanding the o…
View article: The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES
The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES Open
RUBIES-UDS-QG-z7 (RQG) is the earliest massive quiescent galaxy identified to date, inferred to have formed its abundant stellar mass in a single burst that ceases rapidly before $z \sim 8$. An object of such extreme nature challenges our …
View article: Learning the Universe: Physically Motivated Priors for Dust Attenuation Curves
Learning the Universe: Physically Motivated Priors for Dust Attenuation Curves Open
Understanding the impact of dust on the spectral energy distributions (SEDs) of galaxies is crucial for inferring their physical properties and for studying the nature and evolution of interstellar dust. In this study, we analyze dust atte…
View article: How does feedback affect the star formation histories of galaxies?
How does feedback affect the star formation histories of galaxies? Open
Star formation in galaxies is regulated by the interplay of a range of processes that shape the multiphase gas in the interstellar and circumgalactic media. Using the CAMELS suite of cosmological simulations, we study the effects of varyin…
View article: Behind the spotlight: a systematic assessment of outshining using NIRCam medium bands in the JADES Origins Field
Behind the spotlight: a systematic assessment of outshining using NIRCam medium bands in the JADES Origins Field Open
The spatial resolution and sensitivity of James Webb Space Telescope’s NIRCam instrument have revolutionized our ability to probe the internal structure of early galaxies. By leveraging deep medium-band imaging in the Jades Origins Field, …
View article: Explaining Ultramassive Quiescent Galaxies at 3 < <i>z</i> < 5 in the Context of Their Environments
Explaining Ultramassive Quiescent Galaxies at 3 < <i>z</i> < 5 in the Context of Their Environments Open
The swift assembly of the earliest galaxies poses a significant challenge to our understanding of galaxy formation. Ultramassive quiescent galaxies at intermediate redshifts (3 < z < 5) currently present one of the most pressing problems f…
View article: First Light and Reionization Epoch Simulations (FLARES) -- XVIII: the ionising emissivities and hydrogen recombination line properties of early AGN
First Light and Reionization Epoch Simulations (FLARES) -- XVIII: the ionising emissivities and hydrogen recombination line properties of early AGN Open
One of the most remarkable results from the \emph{James Webb Space Telescope} has been the discovery of a large population of compact sources exhibiting strong broad H$α$ emission, typically interpreted to be low-luminosity broad-line (Typ…
View article: Probing the co-evolution of Supermassive Black Holes and their hosts from scaling relations pairwise residuals: dominance of stellar velocity dispersion and host halo mass
Probing the co-evolution of Supermassive Black Holes and their hosts from scaling relations pairwise residuals: dominance of stellar velocity dispersion and host halo mass Open
The correlations between supermassive black holes (SMBHs) and their host galaxies still defy our understanding from both the observational and theoretical perspectives. Here, we perform pairwise residual analysis on the latest sample of lo…
View article: Probing the co-evolution of SMBHs and their hosts from scaling relations pairwise residuals: dominance of stellar velocity dispersion and host halo mass
Probing the co-evolution of SMBHs and their hosts from scaling relations pairwise residuals: dominance of stellar velocity dispersion and host halo mass Open
The correlations between Supermassive Black Holes (SMBHs) and their host galaxies still defy our understanding from both the observational and theoretical perspectives. Here we perform pairwise residual analysis on the latest sample of loc…
View article: Euclid Quick Data Release (Q1). Extending the quest for little red dots to z<4
Euclid Quick Data Release (Q1). Extending the quest for little red dots to z<4 Open
Recent James Webb Space Telescope (JWST) observations have revealed a population of sources with a compact morphology and a characteristic `v-shaped' continuum, namely blue at rest-frame $λ<4000$A and red at longer wavelengths. The nature …
View article: Euclid Quick Data Release (Q1): The evolution of the passive-density and morphology-density relations between $z=0.25$ and $z=1$
Euclid Quick Data Release (Q1): The evolution of the passive-density and morphology-density relations between $z=0.25$ and $z=1$ Open
The extent to which the environment affects galaxy evolution has been under scrutiny by researchers for decades. With the first data from Euclid, we can begin to study a wide range of environments and their effects as a function of redshif…
View article: Euclid Quick Data Release (Q1). An investigation of optically faint, red objects in the Euclid Deep Fields
Euclid Quick Data Release (Q1). An investigation of optically faint, red objects in the Euclid Deep Fields Open
Our understanding of cosmic star-formation at $z>3$ used to largely rely on rest-frame UV observations. However, these observations overlook dusty and massive sources, resulting in an incomplete census of early star-forming galaxies. Recen…
View article: First Light and Reionization Epoch Simulations (FLARES) – XV: The physical properties of super-massive black holes and their impact on galaxies in the early universe
First Light and Reionization Epoch Simulations (FLARES) – XV: The physical properties of super-massive black holes and their impact on galaxies in the early universe Open
Understanding the co-evolution of super-massive black holes (SMBHs) and their host galaxies remains a key challenge of extragalactic astrophysics, particularly the earliest stages at high-redshift. However, studying SMBHs at high-redshift …
View article: First Light And Reionisation Epoch Simulations (FLARES)
First Light And Reionisation Epoch Simulations (FLARES) Open
We used the First Light And Reionisation Epoch Simulations (F LARES ) suite to study the evolution of the rest-frame ultraviolet (UV) and far-infrared (FIR) sizes for a statistical sample of massive (≳10 9 M ⊙ ) high-redshift galaxies ( z …
View article: On the Significance of Rare Objects at High Redshift: The Impact of Cosmic Variance
On the Significance of Rare Objects at High Redshift: The Impact of Cosmic Variance Open
The discovery of extremely luminous galaxies at ultra-high redshifts ( z ≳ 8) has challenged galaxy formation models. Most analyses of this tension have not accounted for the variance due to field-to-field clustering, which causes the numb…
View article: First Light and Reionization Epoch Simulations (FLARES) – XVII. Learning the galaxy–halo connection at high redshifts
First Light and Reionization Epoch Simulations (FLARES) – XVII. Learning the galaxy–halo connection at high redshifts Open
Understanding the galaxy–halo relationship is not only key for elucidating the interplay between baryonic and dark matter, it is essential for creating large mock galaxy catalogues from N-body simulations. High-resolution hydrodynamical si…
View article: The Spectral Energy Distributions of Galaxies
The Spectral Energy Distributions of Galaxies Open
The spectral energy distribution (SED) of a galaxy represents the distribution of electromagnetic radiation emitted across all wavelengths, from radio waves to gamma rays. The galaxy SED is akin to its fingerprint, and serves as a fundamen…
View article: Learning the Universe: physically-motivated priors for dust attenuation curves
Learning the Universe: physically-motivated priors for dust attenuation curves Open
Understanding the impact of dust on the spectral energy distributions (SEDs) of galaxies is crucial for inferring their physical properties and for studying the nature of interstellar dust. We analyze dust attenuation curves for $\sim 6400…
View article: Like a candle in the wind: the embers of once aflame, now smouldering galaxies at 5 &lt; <i>z</i> &lt; 8
Like a candle in the wind: the embers of once aflame, now smouldering galaxies at 5 < <i>z</i> < 8 Open
We develop a photometric search method for identifying smouldering galaxies at $5\lt z \lt 8$, which are defined to have weak emission lines and thus generally have low specific star formation rates and may even be in a state of (temporary…
View article: Cloudy-Maraston: Integrating nebular continuum and line emission with the Maraston stellar population synthesis models
Cloudy-Maraston: Integrating nebular continuum and line emission with the Maraston stellar population synthesis models Open
The James Webb Space Telescope has ushered in an era of abundant high-redshift observations of young stellar populations characterized by strong emission lines, motivating us to integrate nebular emission into the new Maraston stellar popu…
View article: Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects
Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects Open
It has been recently shown that a powerful way to constrain cosmological parameters from galaxy redshift surveys is to train graph neural networks to perform field-level likelihood-free inference without imposing cuts on scale. In particul…
View article: EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations
EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations Open
We utilize deep JWST Near Infrared Camera (NIRCam) observations for the first direct constraints on the Galaxy Stellar Mass Function (GSMF) at z > 10. Our EPOCHS v1 sample includes 1120 galaxy candidates at 6.5 < z < 13.5 taken from a cons…
View article: Learning the Universe: Cosmological and Astrophysical Parameter Inference with Galaxy Luminosity Functions and Colours
Learning the Universe: Cosmological and Astrophysical Parameter Inference with Galaxy Luminosity Functions and Colours Open
We perform the first direct cosmological and astrophysical parameter inference from the combination of galaxy luminosity functions and colours using a simulation based inference approach. Using the Synthesizer code we simulate the dust att…
View article: First Light and Reionisation Epoch Simulations (FLARES) XVII: Learning the galaxy-halo connection at high redshifts
First Light and Reionisation Epoch Simulations (FLARES) XVII: Learning the galaxy-halo connection at high redshifts Open
Understanding the galaxy-halo relationship is not only key for elucidating the interplay between baryonic and dark matter, it is essential for creating large mock galaxy catalogues from N-body simulations. High-resolution hydrodynamical si…
View article: The <i>JWST</i> EXCELS survey: too much, too young, too fast? Ultra-massive quiescent galaxies at 3 &lt; z &lt; 5
The <i>JWST</i> EXCELS survey: too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5 Open
We report ultra-deep, medium-resolution spectroscopic observations for four quiescent galaxies with log$_{10}(M_*/\mathrm{M_\odot })\gt 11$ at $3 \lt z \lt 5$. These data were obtained with JWST NIRSpec as part of the Early eXtragalactic C…
View article: Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web
Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web Open
We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin 2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared …