Publications (77)
Bulk flow in the combined 2MTF and 6dFGSv surveys
Fei Qin, Cullan Howlett, Lister Staveley-Smith +1
We create a combined sample of 10,904 late and early-type galaxies from the 2MTF and 6dFGSv surveys in order to accurately measure bulk flow in the local Universe. Galaxies and gro…
2MTF - VII. 2MASS Tully-Fisher survey final data release: distances for 2,062 nearby spiral galaxies
Tao Hong, Lister Staveley-Smith, Karen L. Masters +8
We present the final distance measurements for the 2MASS Tully-Fisher (2MTF) survey. The final 2MTF catalogue contains 2,062 nearby spiral galaxies in the CMB frame velocity range…
Dynamical Dark Energy in light of the DESI DR2 Baryonic Acoustic Oscillations Measurements
Gan Gu, Xiaoma Wang, Yuting Wang +57
Understanding whether cosmic acceleration arises from a cosmological constant or a dynamical component is a central goal of cosmology, and the Dark Energy Spectroscopic Instrument…
HI HOD -- I. The Halo Occupation Distribution of HI Galaxies
Fei Qin, Cullan Howlett, Adam R. H. Stevens +1
The next generation of galaxy surveys will provide more precise measurements of galaxy clustering than have previously been possible. The 21-cm radio signals that are emitted from…
L-PICOLA: A parallel code for fast dark matter simulation
Cullan Howlett, Marc Manera, Will J. Percival
Robust measurements based on current large-scale structure surveys require precise knowledge of statistical and systematic errors. This can be obtained from large numbers of realis…
Enhancing DESI DR1 Full-Shape analyses using HOD-informed priors
Hanyu Zhang, Marco Bonici, Antoine Rocher +57
We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based o…
Cosmology with the MaunaKea Spectroscopic Explorer
Will J. Percival, Christophe Yèche, Maciej Bilicki +11
This document summarizes the science cases related to cosmology studies with the MaunaKea Spectroscopic Explorer (MSE), a highly-multiplexed (4332 fibers), wide FOV (1.5 sq deg), l…
The Detailed Science Case for the Maunakea Spectroscopic Explorer, 2019 edition
The MSE Science Team, Carine Babusiaux, Maria Bergemann +258
(Abridged) The Maunakea Spectroscopic Explorer (MSE) is an end-to-end science platform for the design, execution and scientific exploitation of spectroscopic surveys. It will unvei…
Cosmological Forecasts for Combined and Next Generation Peculiar Velocity Surveys
Cullan Howlett, Lister Staveley-Smith, Chris Blake
Peculiar velocity surveys present a very promising route to measuring the growth rate of large-scale structure and its scale dependence. However, individual peculiar velocity surve…
The Redshift-Space Momentum Power Spectrum III: measuring the growth rate from the SDSSv survey using auto- and cross- power spectrum of the galaxy density and momentum fields
Fei Qin, Cullan Howlett, David Parkinson
The large-scale structure of the Universe and its evolution over time contains an abundance of cosmological information. One way to unlock this is by measuring the density and mome…
Cross-correlating radial peculiar velocities and CMB lensing convergence
Leonardo Giani, Cullan Howlett, Rossana Ruggeri +3
We study, for the first time, the cross correlation between the angular distribution of radial peculiar velocities (PV) and the lensing convergence of cosmic microwave background (…
Revisiting GW170817 at milliarcsecond scale: high-precision constraints on jet geometry and
Kelly Gourdji, Adam T. Deller, Chris Flynn +4
The historic detection of gravitational waves from the electromagnetically bright binary neutron star merger GW170817 enabled the first standard siren measurement of Hubble's const…
Full-Shape Galaxy Power Spectra and the Curvature Tension
Aaron Glanville, Cullan Howlett, Tamara M. Davis
With recent evidence for a possible "curvature tension" among early and late universe cosmological probes, Effective Field Theories of Large Scale Structure (EFTofLSS) have emerged…
Using peculiar velocity surveys to constrain neutrino masses
Abbe M. Whitford, Cullan Howlett, Tamara M. Davis
The presence of massive neutrinos in the early Universe is expected to have influenced the observed distribution of galaxies, and their observed motions. In this work, we explore w…
Forward modeling fluctuations in the DESI LRGs target sample using image simulations
Hui Kong, Ashley J. Ross, Klaus Honscheid +50
We use the forward modeling pipeline, Obiwan, to study the imaging systematics of the Luminous Red Galaxies (LRGs) targeted by the Dark Energy Spectroscopic Instrument (DESI). We u…
Target Selection for the DESI Peculiar Velocity Survey
Christoph Saulder, Cullan Howlett, Kelly A. Douglass +35
We describe the target selection and characteristics of the DESI Peculiar Velocity Survey, the largest survey of peculiar velocities (PVs) using both the fundamental plane (FP) and…
Detection of the Pairwise Kinematic Sunyaev-Zel'dovich Effect and Pairwise Velocity with DESI DR1 Galaxies and ACT DR6 and Planck CMB Data
Yulin Gong, Patricio A. Gallardo, Rachel Bean +50
We present a 9.3-sigma detection of the pairwise kinematic Sunyaev-Zeldovich (kSZ) effect by combining a sample of 913,286 Luminous Red Galaxies (LRGs) from the Dark Energy Spectro…
ELG Spectroscopic Systematics Analysis of the DESI Data Release 1
Jiaxi Yu, Ashley J. Ross, Antoine Rocher +58
Dark Energy Spectroscopic Instrument (DESI) uses more than 2.4 million Emission Line Galaxies (ELGs) for 3D large-scale structure (LSS) analyses in its Data Release 1 (DR1). Such l…
CMB power spectrum parameter degeneracies in the era of precision cosmology
Cullan Howlett, Antony Lewis, Alex Hall +1
Cosmological parameter constraints from the CMB power spectra alone suffer several well-known degeneracies. These degeneracies can be broken by numerical artefacts and also a varie…
A Short Research Note on Calculating Exact Distribution Functions and Random Sampling for the 3D NFW Profile
A. S. G. Robotham, Cullan Howlett
In this short note we publish the analytic quantile function for the Navarro, Frenk & White (NFW) profile. All known published and coded methods for sampling from the 3D NFW PDF us…
Cosmic Flow Measurement and Mock Sampling Algorithm of Cosmicflows-4 Tully-Fisher Catalogue
Fei Qin, David Parkinson, Cullan Howlett +1
Measurements of cosmic flows enable us to test whether cosmological models can accurately describe the evolution of the density field in the nearby Universe. In this paper, we meas…
Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups
Erik R. Peterson, Bastien Carreres, Anthony Carr +9
At the low-redshift end () of the Hubble diagram with Type Ia Supernovae (SNe Ia), the contribution to Hubble residual scatter from peculiar velocities is of similar size t…
DESIVAST: A Catalog of Low-Redshift Voids using Data from the DESI DR1 Bright Galaxy Survey
Hernan Rincon, Segev BenZvi, Kelly Douglass +37
We present three separate void catalogs created using a volume-limited sample of the DESI Year 1 Bright Galaxy Survey. We use the algorithms VoidFinder and V2 to construct void cat…
The Redshift Space Momentum Power Spectrum II: measuring the growth rate from the combined 2MTF and 6dFGSv surveys
Fei Qin, Cullan Howlett, Lister Staveley-Smith
Measurements of the growth rate of structure, in the low-redshift Universe allow stringent tests of the cosmological model. In this work, we provide new constraints on $fÏ…
Exploring binary black hole mergers and host galaxies with Shark and COMPAS
Liana Rauf, Cullan Howlett, Tamara M. Davis +1
We explore the connection between the gravitational wave (GW) merger rates of stellar-mass binary black holes (BBH) and galaxy properties. We do this by generating populations of s…
Cosmicflows-4
R. Brent Tully, Ehsan Kourkchi, Hélène M. Courtois +14
With Cosmicflows-4, distances are compiled for 55,877 galaxies gathered into 38,065 groups. Eight methodologies are employed, with the largest numbers coming from the correlations…
Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6
Noah Sailer, Joshua Kim, Simone Ferraro +63
We infer the growth of large scale structure over the redshift range from the cross-correlation of spectroscopically calibrated Luminous Red Galaxies (LR…
Illuminating the Physics of Cosmic Origin and Evolution: A UK Space Frontiers 2035 White Paper
Florian Beutler, Eva-Maria Mueller, Seshadri Nadathur +61
Understanding the Universe's origins and evolution remains one of the most fundamental challenges in modern cosmology. This white paper explores three key science priorities in thi…
The Effect of Systematic Redshift Biases in BAO Cosmology
Aaron Glanville, Cullan Howlett, Tamara M. Davis
With the remarkable increase in scale and precision provided by upcoming galaxy redshift surveys, systematic errors that were previously negligible may become significant. In this…
Analytical and EZmock covariance validation for the DESI 2024 results
Daniel Forero-Sánchez, Michael Rashkovetskyi, Otávio Alves +44
The estimation of uncertainties in cosmological parameters is an important challenge in Large-Scale-Structure (LSS) analyses. For standard analyses such as Baryon Acoustic Oscillat…
Cosmological implications of baryon acoustic oscillation (BAO) measurements
Ãric Aubourg, Stephen Bailey, Julian E. Bautista +90
We derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave backgr…
The Hubble Tension in our own Backyard: DESI and the Nearness of the Coma Cluster
Daniel Scolnic, Adam G. Riess, Yukei S. Murakami +8
The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant () and the distance to the Coma cluster using the fundament…
Bulk flow and shear in the local Universe: 2MTF and COSMICFLOWS-3
Fei Qin, Cullan Howlett, Lister Staveley-Smith +1
The low-order kinematic moments of galaxies, namely bulk flow and shear, enables us to test whether theoretical models can accurately describe the evolution of the mass density fie…
Baryon Acoustic Oscillation Theory and Modelling Systematics for the DESI 2024 results
Shi-Fan Chen, Cullan Howlett, Martin White +58
This paper provides a comprehensive overview of how fitting of Baryon Acoustic Oscillations (BAO) is carried out within the upcoming Dark Energy Spectroscopic Instrument's (DESI) 2…
The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
Ashley J. Ross, Lado Samushia, Cullan Howlett +3
We create a sample of spectroscopically identified galaxies with from the Sloan Digital Sky Survey (SDSS) Data Release 7, covering 6813 deg. Galaxies are chosen to sa…
Limits of self-interacting neutrinos from the BAO and CMB phase shift
Abbé M. Whitford, Cullan Howlett, Tamara M. Davis +2
Neutrinos with Standard Model interactions free-stream in the early Universe, leaving a distinct phase shift in the pattern of baryon acoustic oscillations (BAO). When isolated, th…
Using peculiar velocity surveys to constrain the growth rate of structure with the wide-angle effect
Yan Lai, Cullan Howlett, Tamara M. Davis
Amongst the most popular explanations for dark energy are modified theories of gravity. The galaxy overdensity and peculiar velocity fields help us to constrain the growth rate of…
Cosmological Constraints from Fourier Phase Statistics
Kamran Ali, Danail Obreschkow, Cullan Howlett +4
Most statistical inference from cosmic large-scale structure relies on two-point statistics, i.e.\ on the galaxy-galaxy correlation function (2PCF) or the power spectrum. These sta…
Constraining the phase shift of relativistic species in DESI BAOs
Abbé M. Whitford, Hugo Rivera-Morales, Cullan Howlett +36
In the early Universe, neutrinos decouple quickly from the primordial plasma and propagate without further interactions. The impact of free-streaming neutrinos is to create a tempo…
Measuring the growth rate of structure with Type IA Supernovae from LSST
Cullan Howlett, Aaron S. G. Robotham, Claudia D. P. Lagos +1
We investigate measuring the peculiar motions of galaxies up to using Type Ia supernovae (SNe Ia) from LSST, and predict the subsequent constraints on the growth rate of st…
The Galaxy Number Density Profile of Haloes
Fei Qin, David Parkinson, Adam R. H. Stevens +1
More precise measurements of galaxy clustering will be provided by the next generation of galaxy surveys such as DESI, WALLABY and SKA. To utilize this information to improve our u…
The MOST Hosts Survey: spectroscopic observation of the host galaxies of ~40,000 transients using DESI
Maayane T. Soumagnac, Peter Nugent, Robert A. Knop +54
We present the MOST Hosts survey (Multi-Object Spectroscopy of Transient Hosts). The survey is planned to run throughout the five years of operation of the Dark Energy Spectroscopi…
Multi-wavelength consensus of large-scale linear bias
Hengxing Pan, Danail Obreschkow, Cullan Howlett +4
We model the large-scale linear galaxy bias as a function of redshift and observed absolute magnitude threshold for broadband continuum emission from the far inf…
The Sloan Digital Sky Survey Peculiar Velocity Catalogue
Cullan Howlett, Khaled Said, John R. Lucey +5
We present a new catalogue of distances and peculiar velocities (PVs) of early-type galaxies derived from Fundamental Plane (FP) measurements using data from the Sloan Dig…
Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies
R. Henry Liu, Simone Ferraro, Emmanuel Schaan +54
Cosmic Microwave Background (CMB) photons scatter off the free-electron gas in galaxies and clusters, allowing us to use the CMB as a backlight to probe the gas in and around low-r…
Can a multi-tracer approach improve the constraints on the turnover scale at low redshift?
Yan Lai, Cullan Howlett, Tamara Davis
The turnover scale of the power spectrum is related to the size of the particle horizon at the matter-radiation equality, which can be used as a standard ruler to constrain cosmolo…
Barry and the BAO Model Comparison
Samuel R. Hinton, Cullan Howlett, Tamara M. Davis
We compare the performance of four state-of-the-art models for extracting isotropic measurements of the Baryon Acoustic Oscillation (BAO) scale. To do this, we created a new, publi…
The Atacama Cosmology Telescope DR6 and DESI: Structure formation over cosmic time with a measurement of the cross-correlation of CMB Lensing and Luminous Red Galaxies
Joshua Kim, Noah Sailer, Mathew S. Madhavacheril +70
We present a high-significance cross-correlation of CMB lensing maps from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) with spectroscopically calibrated luminous red…
CosmoBit: A GAMBIT module for computing cosmological observables and likelihoods
The GAMBIT Cosmology Workgroup, :, Janina J. Renk +13
We introduce , a module within the open-source software framework for exploring connections between cosmology and particle physics with joint global fi…
Reconstruction in Fourier space
Angela Burden, Will J. Percival, Cullan Howlett
We present a fast iterative FFT-based reconstruction algorithm that allows for non- parallel redshift-space distortions (RSD). We test our algorithm on both N-body dark matter simu…
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: mock galaxy catalogues for the low-redshift sample
Marc Manera, Lado Samushia, Rita Tojeiro +7
We present one thousand mock galaxy catalogues for the analysis of the Low Redshift Sample (LOWZ, effective redshift z ~ 10.32) of the Baryon Oscillation Spectroscopic Survey Data…
Detection of the large-scale tidal field with galaxy multiplet alignment in the DESI Y1 spectroscopic survey
Claire Lamman, Daniel Eisenstein, Jaime E. Forero-Romero +36
We explore correlations between the orientations of small galaxy groups, or "multiplets", and the large-scale gravitational tidal field. Using data from the Dark Energy Spectroscop…
Standard Siren Speeds: Improving velocities in gravitational-wave measurements of
Cullan Howlett, Tamara M. Davis
We re-analyze data from the gravitational-wave event GW170817 and its host galaxy NGC4993 to demonstrate the importance of accurate total and peculiar velocities when measuring the…
Dark sirens and the impact of redshift precision
Madeline L. Cross-Parkin, Cullan Howlett, Tamara M. Davis +1
With the growing number of gravitational wave detections, achieving a competitive measurement of with dark sirens is becoming increasingly feasible. The expansion of the Ligo…
Cosmology with Peculiar Velocities: Observational Effects
Per Andersen, Tamara M. Davis, Cullan Howlett
In this paper we investigate how observational effects could possibly bias cosmological inferences from peculiar velocity measurements. Specifically, we look at how bulk flow measu…
Nonlinear Information from DESI Luminous Red Galaxies: An Emulator-Based Analysis of Pre- and Post-Reconstruction Power Spectra
Yuting Wang, Gong-Bo Zhao, Kazuya Koyama +61
We present joint measurements of the pre- and post-reconstruction power spectra, and , together with their cross-power spectrum, , for th…
Can redshift errors bias measurements of the Hubble Constant?
Tamara M. Davis, Samuel R. Hinton, Cullan Howlett +1
Redshifts have been so easy to measure for so long that we tend to neglect the fact that they too have uncertainties and are susceptible to systematic error. As we strive to measur…
Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments
The GAMBIT Cosmology Workgroup, :, Patrick Stöcker +12
We determine the upper limit on the mass of the lightest neutrino from the most robust recent cosmological and terrestrial data. Marginalizing over possible effective relativistic…
Dark siren cross-correlations and the sensitivity of to methodological choices
Madeline L. Cross-Parkin, Cullan Howlett, Leonardo Giani +2
Gravitational wave sources act as absolute distance indicators, making them powerful probes of the present-day expansion rate of the Universe, . The cross-correlation method c…
The velocity coherence scale: a novel probe of cosmic homogeneity and a potential standard ruler
Leonardo Giani, Cullan Howlett, Chris Blake +2
We introduce the velocity coherence scale , the scale at which the spherical volume average of the trace of the velocity correlation tensor transitions from scaling faster tha…
A Trifecta of Modelling Tools: A Bayesian Binary Black Hole Model Selection combining Population Synthesis and Galaxy Formation Models
Liana Rauf, Cullan Howlett, Simon Stevenson +2
Gravitational waves (GWs) have revealed surprising properties of binary black hole (BBH) populations, but there is still mystery surrounding how these compact objects evolve. We ap…
The Taipan Galaxy Survey: Scientific Goals and Observing Strategy
Elisabete da Cunha, Andrew M. Hopkins, Matthew Colless +37
Taipan is a multi-object spectroscopic galaxy survey starting in 2017 that will cover 2pi steradians over the southern sky, and obtain optical spectra for about two million galaxie…
The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4
Frank J. Qu, Qianjun Hang, Gerrit Farren +51
We measure the growth of cosmic density fluctuations on large scales and across the redshift range through the cross-correlation of the ACT DR6 CMB lensing map and gala…
Can Einstein (rings) surf Gravitational Waves?
Leonardo Giani, Cullan Howlett, Tamara M. Davis
How does the appearance of a strongly lensed system change if a gravitational wave is produced by the lens? In this work we address this question by considering a supermassive blac…
The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys
Cullan Howlett
Low redshift surveys of galaxy peculiar velocities provide a wealth of cosmological information. We revisit the idea of extracting this information by directly measuring the redshi…
Faster cosmological analysis with power spectrum without simulations
Yan Lai, Cullan Howlett, Tamara M. Davis
Future surveys could obtain tighter constraints on the cosmological parameters with the galaxy power spectrum than with the Cosmic Microwave Background. However, the inclusion o…
The Clustering of the SDSS Main Galaxy Sample II: Mock galaxy catalogues and a measurement of the growth of structure from Redshift Space Distortions at
Cullan Howlett, Ashley J. Ross, Lado Samushia +2
We measure Redshift-Space Distortions (RSD) in the two-point correlation function of a sample of spectroscopically identified galaxies with , an epoch where there…
DESI Peculiar Velocity Survey -- Fundamental Plane
Khaled Said, Cullan Howlett, Tamara Davis +52
The Dark Energy Spectroscopic Instrument (DESI) Peculiar Velocity Survey aims to measure the peculiar velocities of early and late type galaxies within the DESI footprint using bot…
WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields
Hélène M. Courtois, Khaled Said, Jeremy Mould +28
The WALLABY pilot survey has been conducted using the Australian SKA Pathfinder (ASKAP). The integrated 21-cm HI line spectra are formed in a very different manner compared to usua…
2MTF VI. Measuring the velocity power spectrum
Cullan Howlett, Lister Staveley-Smith, Pascal J. Elahi +7
We present measurements of the velocity power spectrum and constraints on the growth rate of structure , at redshift zero, using the peculiar motions of 2,062 galaxies in…
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
Lauren Anderson, Eric Aubourg, Stephen Bailey +62
We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations in the clustering of galaxies from the Baryon Oscillation…
Galaxy And Mass Assembly (GAMA): Stellar-to-Dynamical Mass Relation II. Peculiar Velocities
M. Burak Dogruel, Edward Taylor, Michelle Cluver +7
Empirical correlations connecting starlight to galaxy dynamics (e.g., the fundamental plane (FP) of elliptical/quiescent galaxies and the Tully--Fisher relation of spiral/star-form…
Galaxy 2-Point Covariance Matrix Estimation for Next Generation Surveys
Cullan Howlett, Will J. Percival
We perform a detailed analysis of the covariance matrix of the spherically averaged galaxy power spectrum and present a new, practical method for estimating this within an arbitrar…
Ho'oleilana: An Individual Baryon Acoustic Oscillation?
R. Brent Tully, Cullan Howlett, Daniel Pomarede
Theory of the physics of the early hot universe leads to a prediction of baryon acoustic oscillations that has received confirmation from the pair-wise separations of galaxies in s…
Effective Theories of Redshift-Space Galaxy Peculiar Velocities
Shi-Fan Chen, Cullan Howlett, Yan Lai +1
We present predictions for redshift-space peculiar velocity statistics in the Lagrangian and Eulerian formulations of the effective field theory (EFT) of large-scale structure. We…
Constraining the growth rate of structure with phase correlations
Joyce Byun, Felipe Oliveira Franco, Cullan Howlett +2
We show that correlations between the phases of the galaxy density field in redshift space provide additional information about the growth rate of large-scale structure that is com…
Skipping the rungs! Calibrating distance indicators through their clustering with galaxies
Madeline L. Cross-Parkin, Leonardo Giani, Cullan Howlett +1
We show that angular cross-correlations between distance indicators and galaxy redshift catalogues, when interpreted within an assumed cosmological model, can constrain potential b…