J. Loveday
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View article: The 4MOST-Cosmology Redshift Survey: target selection of bright galaxies and luminous red galaxies
The 4MOST-Cosmology Redshift Survey: target selection of bright galaxies and luminous red galaxies Open
The Cosmology Redshift Survey of the 4-metre Multi-Object Spectroscopic Telescope (4MOST-CRS) will provide redshift measurements of galaxies and quasars over 5800 $\rm {deg^{2}}$ in the Southern hemisphere. As targets for the 4MOST-CRS, we…
View article: 4MOST Cosmology Redshift Survey (CRS): Clustering properties of CRS BG and LRG target catalogues
4MOST Cosmology Redshift Survey (CRS): Clustering properties of CRS BG and LRG target catalogues Open
The 4MOST Cosmology Redshift Survey (CRS) will obtain nearly 5.4 million spectroscopic redshifts over $\sim5700$\,deg$^2$ to map large-scale structure and enable measurements of baryon acoustic oscillations (BAOs), growth rates via redshif…
View article: Galaxy Spectra Networks (GaSNet) – III. Reconstructive pre-trained network for spectrum reconstruction, redshift estimate, and anomaly detection
Galaxy Spectra Networks (GaSNet) – III. Reconstructive pre-trained network for spectrum reconstruction, redshift estimate, and anomaly detection Open
Classification of spectra (1) and anomaly detection (2) are fundamental steps to guarantee the highest accuracy in redshift measurements (3) in modern all-sky spectroscopic surveys. We introduce a new Galaxy Spectra Neural Network (GaSNet-…
View article: The 4MOST-Cosmology Redshift Survey: Target Selection of Bright Galaxies and Luminous Red Galaxies
The 4MOST-Cosmology Redshift Survey: Target Selection of Bright Galaxies and Luminous Red Galaxies Open
The Cosmology Redshift Survey of the 4-metre Multi-Object Spectroscopic Telescope (4MOST-CRS) will provide redshift measurements of galaxies and quasars over 5700{\degsq} in the southern hemisphere. As targets for the 4MOST-CRS, we present…
View article: Galaxy Spectra Networks (GaSNet). III. Generative pre-trained network for spectrum reconstruction, redshift estimate and anomaly detection
Galaxy Spectra Networks (GaSNet). III. Generative pre-trained network for spectrum reconstruction, redshift estimate and anomaly detection Open
Classification of spectra (1) and anomaly detection (2) are fundamental steps to guarantee the highest accuracy in redshift measurements (3) in modern all-sky spectroscopic surveys. We introduce a new Galaxy Spectra Neural Network (GaSNet-…
View article: Wide Area VISTA Extra-galactic Survey (WAVES): unsupervised star-galaxy separation on the WAVES-Wide photometric input catalogue using UMAP and <scp>hdbscan</scp>
Wide Area VISTA Extra-galactic Survey (WAVES): unsupervised star-galaxy separation on the WAVES-Wide photometric input catalogue using UMAP and <span>hdbscan</span> Open
Star-galaxy separation is a crucial step in creating target catalogues for extragalactic spectroscopic surveys. A classifier biased towards inclusivity risks including high numbers of stars, wasting fibre hours, while a more conservative c…
View article: Galaxy Spectra neural Network (GaSNet). II. Using deep learning for spectral classification and redshift predictions
Galaxy Spectra neural Network (GaSNet). II. Using deep learning for spectral classification and redshift predictions Open
The size and complexity reached by the large sky spectroscopic surveys require efficient, accurate, and flexible automated tools for data analysis and science exploitation. We present the Galaxy Spectra Network/GaSNet-II, a supervised mult…
View article: Wide Area VISTA Extra-galactic Survey (WAVES): Unsupervised star-galaxy separation on the WAVES-Wide photometric input catalogue using UMAP and ${\rm{\scriptsize HDBSCAN}}$
Wide Area VISTA Extra-galactic Survey (WAVES): Unsupervised star-galaxy separation on the WAVES-Wide photometric input catalogue using UMAP and ${\rm{\scriptsize HDBSCAN}}$ Open
Star-galaxy separation is a crucial step in creating target catalogues for extragalactic spectroscopic surveys. A classifier biased towards inclusivity risks including spurious stars, wasting fibre hours, while a more conservative classifi…
View article: Do galaxy mergers prefer under-dense environments?
Do galaxy mergers prefer under-dense environments? Open
Context. Galaxy mergers play a crucial role in galaxy evolution. However, the correlation between mergers and the local environment of galaxies is not fully understood. Aims. We aim to address the question of whether galaxy mergers prefer …
View article: Galaxy Spectra neural Network (GaSNet). II. Using Deep Learning for Spectral Classification and Redshift Predictions
Galaxy Spectra neural Network (GaSNet). II. Using Deep Learning for Spectral Classification and Redshift Predictions Open
Large sky spectroscopic surveys have reached the scale of photometric surveys in terms of sample sizes and data complexity. These huge datasets require efficient, accurate, and flexible automated tools for data analysis and science exploit…
View article: Galaxy And Mass Assembly (GAMA): The group H <scp>i</scp> mass as a function of halo mass
Galaxy And Mass Assembly (GAMA): The group H <span>i</span> mass as a function of halo mass Open
We determine the atomic hydrogen (H i) to halo mass relation (HIHM) using Arecibo Legacy Fast ALFA survey H i data at the location of optically selected groups from the Galaxy And Mass Assembly (GAMA) survey. We make direct H i detections …
View article: Galaxy And Mass Assembly (GAMA): The group HI mass as a function of halo mass
Galaxy And Mass Assembly (GAMA): The group HI mass as a function of halo mass Open
We determine the atomic hydrogen (HI) to halo mass relation (HIHM) using Arecibo Legacy Fast ALFA survey HI data at the location of optically selected groups from the Galaxy and Mass Assembly (GAMA) survey. We make direct HI detections for…
View article: Red riding on hood: exploring how galaxy colour depends on environment
Red riding on hood: exploring how galaxy colour depends on environment Open
Galaxy populations are known to exhibit a strong colour bimodality, corresponding to blue star-forming and red quiescent subpopulations. The relative abundance of the two populations has been found to vary with stellar mass and environment…
View article: Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors
Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors Open
We explore the properties of galaxies in the proximity (within a ∼2 Mpc radius sphere) of Type I quasars at 0.1 < z <0.35, to check whether and how an active galaxy influences the properties of its neighbors. We further compare these with …
View article: Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors
Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors Open
We explore the properties of galaxies in the proximity (within a $\sim$2 Mpc radius sphere) of Type I quasars at 0.1
View article: Galaxy and Mass Assembly (GAMA)
Galaxy and Mass Assembly (GAMA) Open
Aims. We investigate how different mid-infrared (mid-IR) properties of galaxies are correlated with the environment in which the galaxies are located. For this purpose, we first study the dependence of galaxy clustering on the absolute mag…
View article: Deep investigation of neutral gas origins (DINGO): H <scp>i</scp> stacking experiments with early science data
Deep investigation of neutral gas origins (DINGO): H <span>i</span> stacking experiments with early science data Open
We present early science results from Deep Investigation of Neutral Gas Origins (DINGO), an $\rm H$i survey using the Australian Square Kilometre Array Pathfinder (ASKAP). Using ASKAP subarrays available during its commissioning phase, DIN…
View article: Galaxy and Mass Assembly (GAMA): probing galaxy-group correlations in redshift space with the halo streaming model
Galaxy and Mass Assembly (GAMA): probing galaxy-group correlations in redshift space with the halo streaming model Open
We have studied the galaxy-group cross-correlations in redshift space for the Galaxy And Mass Assembly (GAMA) Survey. We use a set of mock GAMA galaxy and group catalogues to develop and test a novel ‘halo streaming’ model for redshift-spa…
View article: 4MOST: the 4-metre multi-object spectroscopic telescope project in the assembly, integration, and test phase
4MOST: the 4-metre multi-object spectroscopic telescope project in the assembly, integration, and test phase Open
4MOST is a new high-multiplex, wide-field spectroscopic survey facility under construction for ESO's 4m-VISTA telescope at Paranal, Chile. Its key specifications are: a large field of view of 4.4 square degrees, a high multiplex fibre posi…
View article: The galaxy power spectrum on the lightcone: deep, wide-angle redshift surveys and the turnover scale
The galaxy power spectrum on the lightcone: deep, wide-angle redshift surveys and the turnover scale Open
We derive expressions for the survey-window convolved galaxy power spectrum in real space for a full sky and deep redshift survey, but taking into account the geometrical lightcone effect. We investigate the impact of using the standard me…
View article: Exploring the effect of baryons on the radial distribution of satellite galaxies with GAMA and IllustrisTNG
Exploring the effect of baryons on the radial distribution of satellite galaxies with GAMA and IllustrisTNG Open
We explore the radial distribution of satellite galaxies in groups in the Galaxy and Mass Assembly (GAMA) survey and the IllustrisTNG simulations. Considering groups with masses 12.0 ≤ log10(M/−1M) < 14.8 at < 0.267, we find a good agreeme…
View article: Exploring the effect of baryons on the radial distribution of satellite galaxies with GAMA and IllustrisTNG
Exploring the effect of baryons on the radial distribution of satellite galaxies with GAMA and IllustrisTNG Open
We explore the radial distribution of satellite galaxies in groups in the Galaxy and Mass Assembly (GAMA) survey and the IllustrisTNG simulations. Considering groups with masses $12.0 \le \log _{10} (\mathcal {M}_h / h^{-1} \, \mathrm{M}_{…
View article: The XXL Survey
The XXL Survey Open
Why are some galaxy groups pervaded by a hot X-ray emitting intracluster medium, whilst others have no detectable X-ray emission? Is the presence of hot gas a reliable indicator of dynamical maturity, and can some virialised groups contain…
View article: The XXL Survey XLV. Linking the ages of optically selected groups to their X-ray emission
The XXL Survey XLV. Linking the ages of optically selected groups to their X-ray emission Open
We investigate the properties of 232 optical spectroscopically selected groups from the Galaxy And Mass Assembly (GAMA) survey that overlap the XXL X-ray cluster survey. X-ray aperture flux measurements combined with GAMA group data provid…
View article: An empirical measurement of the Halo Mass Function from the combination of GAMA DR4, SDSS DR12, and REFLEX II data
An empirical measurement of the Halo Mass Function from the combination of GAMA DR4, SDSS DR12, and REFLEX II data Open
We construct the halo mass function (HMF) from the GAMA galaxy group catalogue over the mass range 10^12.7M_sol to 10^15.5M_sol, and find good agreement with the expectation from LambdaCDM. In comparison to previous studies, this result ex…
View article: An empirical measurement of the halo mass function from the combination of GAMA DR4, SDSS DR12, and REFLEX II data
An empirical measurement of the halo mass function from the combination of GAMA DR4, SDSS DR12, and REFLEX II data Open
We construct the halo mass function (HMF) from the GAMA (Galaxy And Mass Assembly) galaxy group catalogue over the mass range of 1012.7–1015.5 M⊙, and find good agreement with the expectation from Lambda cold dark matter. In comparison to …
View article: Galaxy And Mass Assembly (GAMA): Data Release 4 and the <i>z</i> &lt; 0.1 total and <i>z</i> &lt; 0.08 morphological galaxy stellar mass functions
Galaxy And Mass Assembly (GAMA): Data Release 4 and the <i>z</i> < 0.1 total and <i>z</i> < 0.08 morphological galaxy stellar mass functions Open
In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248 682 galaxy spectra, and, in combination with earlier surveys, results in 330 542 redshifts across five sky r…
View article: Galaxy And Mass Assembly (GAMA): <i>z</i> ~ 0 galaxy luminosity function down to <i>L</i> ~ 106 L⊙ via clustering based redshift inference
Galaxy And Mass Assembly (GAMA): <i>z</i> ~ 0 galaxy luminosity function down to <i>L</i> ~ 106 L⊙ via clustering based redshift inference Open
In this study, we present a new experimental design using clustering-based redshift inference to measure the evolving galaxy luminosity function (GLF) spanning 5.5 decades from L ∼ 1011.5 to 106 L⊙. We use data from the Galaxy And Mass Ass…
View article: The galaxy power spectrum on the lightcone: deep, wide-angle redshift surveys and the turnover scale
The galaxy power spectrum on the lightcone: deep, wide-angle redshift surveys and the turnover scale Open
We derive expressions for the survey-window convolved galaxy power spectrum in real space for a full sky and deep redshift survey, but taking into account the geometrical lightcone effect. We investigate the impact of using the standard me…
View article: Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data
Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data Open
We use the 21-cm emission-line data from the Deep Investigation of Neutral Gas Origin-Very Large Array (DINGO-VLA) project to study the atomic hydrogen gas H i of the Universe at redshifts z < 0.1. Results are obtained using a stacking …