Explanipedia

WALLABY Pilot Survey: Characterizing Low-rotation Kinematically Modeled Galaxies Open

Nathan Deg, Kristine Spekkens, Nikhil Arora, R. M. Dudley, H. Peter White , et al. · 2025

Many of the tensions in cosmological models of the Universe lie in the low-mass, low-velocity regime. Probing this regime requires a statistically significant sample of galaxies with well-measured kinematics and robustly measured uncertain…

WALLABY: an untargeted search for H i -bearing ultra-diffuse galaxies uncovers the first known ultra-diffuse galaxy pair Open

T. O’Beirne, V. A. Kilborn, M. E. Cluver, O. Ivy Wong, Nathan Deg , et al. · 2025

Using the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY), we performed an untargeted search for H i-bearing ultra-diffuse galaxies (UDGs). We identified a core sample of 10 UDGs defined by $\mu _{0,g}\ge 24$ mag arcsec$^{-2}$…

WALLABY Pilot Survey: Characterizing Low Rotation Kinematically Modelled Galaxies Open

Nathan Deg, Kristine Spekkens, Nikhil Arora, R. M. Dudley, H. Peter White , et al. · 2025

Many of the tensions in cosmological models of the Universe lie in the low mass, low velocity regime. Probing this regime requires a statistically significant sample of galaxies with well measured kinematics and robustly measured uncertain…

WALLABY Pilot Survey: the extensive interaction of NGC 4532 and DDO 137 with the Virgo cluster Open

L. Staveley‐Smith, Kenji Bekki, A. Boselli, L. Cortese, Nathan Deg , et al. · 2025

As part of the pilot survey of the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY), high-resolution neutral atomic hydrogen (HI) observations of the dwarf galaxy pair NGC 4532/DDO 137 (WALLABY J123424+062511) have revealed a huge (4…

WALLABY pilot survey: the extensive interaction of NGC 4532 and DDO 137 with the Virgo cluster Open

L. Staveley‐Smith, Kenji Bekki, A. Boselli, L. Cortese, Nathan Deg , et al. · 2025

As part of the pilot survey of the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY), high-resolution neutral atomic hydrogen (HI) observations of the dwarf galaxy pair NGC 4532/DDO 137 (WALLABY J123424+062511) have revealed a huge (4…

Simulating the Milky Way bar and bulge with an initially Sérsic disc Open

Nathan Deg, Victor P. Debattista, Lawrence M. Widrow, Stuart Robert Anderson, O. A. González , et al. · 2025

Physics

We model the formation of a bar plus box/peanut bulge (BP bulge) component in a Milky Way-like disc galaxy using simulations of isolated multi-component systems that evolve from equilibrium initial conditions. The simulations are designed …

The Distribution of Atomic Hydrogen in the Host Galaxies of FRBs Open

H. L. Roxburgh, Marcin Glowacki, C. James, Nathan Deg, Qifeng Huang , et al. · 2025

We probe the atomic hydrogen (HI) emission from the host galaxies of fast radio bursts (FRBs) to investigate the emerging trend of disturbance and asymmetry in the population. Quadrupling the sample size, we detect 16 out of 17 new hosts i…

Investigating the H I distribution and kinematics of ESO444-G084 and [KKS2000]23: New insights from the MHONGOOSE survey Open

B. Namumba, Roger Ianjamasimanana, B. Koribalski, A. Bosma, E. Athanassoula , et al. · 2025

Physics

We present the neutral atomic hydrogen (H I ) distribution, kinematics, mass modelling, and gravitational stability of the dwarf irregular galaxies ESO444–G084 and [KKS2000]23 using high spatial, spectral, and column density sensitivity da…

Investigating the HI distribution and kinematics of ESO444-G084 and [KKS2000]23: New insights from the MHONGOOSE survey Open

B. Namumba, Roger Ianjamasimanana, B. Koribalski, A. Bosma, E. Athanassoula , et al. · 2025

We present the HI distribution, kinematics, mass modeling, and disk stability of the dwarf irregular galaxies ESO444-G084 and [KKS2000]23 using high-resolution, high-sensitivity MHONGOOSE survey data from MeerKAT. ESO444-G084 shows central…

H i asymmetries in spatially resolved simba galaxies Open

N Hank, Marc Verheijen, S.-L. Blyth, Romeel Davé, Kyle A. Oman , et al. · 2025

Physics

We present a study of the neutral atomic hydrogen (H i) content of spatially resolved, low-redshift galaxies in the simba cosmological simulations. We create synthetic H i data cubes designed to match observations from the Apertif Medium-D…

WALLABY pilot survey: properties of HI-selected dark sources and low surface brightness galaxies Open

T. O’Beirne, L. Staveley‐Smith, V. A. Kilborn, O. Ivy Wong, T. Westmeier , et al. · 2025

We examine the optical counterparts of the 1829 neutral hydrogen (HI) detections in three pilot fields in the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) using data from the Dark Energy Spectroscopic Instrument (DESI) Lega…

WALLABY Pilot Survey and ASymba: Comparing H i Detection Asymmetries to the SIMBA Simulation Open

Mathieu Perron-Cormier, Nathan Deg, Kristine Spekkens, Mark L. A. Richardson, Marcin Glowacki , et al. · 2025

Computer science Mathematics

An avenue for understanding cosmological galaxy formation is to compare morphometric parameters in observations and simulations of galaxy assembly. In this second paper of the ASymba: Asymmetries of H i in SIMBA Galaxies series, we measure…

WALLABY Pilot Survey: Star Formation Enhancement and Suppression in Gas-rich Galaxy Pairs Open

Qifeng 齐丰 Huang 黄, Jing Wang, X. Lin, Se–Heon Oh, Xinkai Chen , et al. · 2025

Physics

Galaxy interactions can significantly affect the star formation in galaxies, but it remains a challenge to achieve a consensus on the star formation rate (SFR) enhancement in galaxy pairs. Here, we investigate the SFR enhancement of gas-ri…

WALLABY Pilot Survey: kNN identification of perturbed galaxies through HI morphometrics Open

Benne W. Holwerda, Helga Dénes, J. Rhee, D. A. Leahy, B. Koribalsky , et al. · 2025

Biology Geography Physics

Galaxy morphology in stellar light can be described by a series of "non-parametric" or "morphometric" parameters, such as concentration-asymmetry-smoothness, Gini, $M_{20}$, and Sersic fit. These parameters can be applied to column density…

WALLABY Pilot Survey: kNN identification of perturbed galaxies through H 1 morphometrics Open

Benne W. Holwerda, Helga Dénes, J. Rhee, D. A. Leahy, B. Koribalski , et al. · 2025

Physics Biology

Galaxy morphology in stellar light can be described by a series of ‘non-parametric’ or ‘morphometric’ parameters, such as concentration-asymmetry-smoothness, Gini, $M_{20}$ , and Sérsic fit. These parameters can be applied to column densit…

WALLABY Pilot Survey: HI source-finding with a machine learning framework Open

Li Wang, O. Ivy Wong, T. Westmeier, C. Murugeshan, K. Lee-Waddell , et al. · 2025

Physics Computer science

The data volumes generated by theWidefield ASKAP L-band Legacy All-sky Blind surveY atomic hydrogen ( Hi ) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) necessitate greater automation and reliable automation in the …

WALLABY pilot survey: Properties of H i-selected dark sources and low surface brightness galaxies Open

T. O’Beirne, L. Staveley‐Smith, V. A. Kilborn, O. Ivy Wong, T. Westmeier , et al. · 2025

Physics

We examine the optical counterparts of the 1 829 neutral hydrogen (H i ) detections in three pilot fields in the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) using data from the Dark Energy Spectroscopic Instrument (DESI) L…

WALLABY pilot survey: Spatially resolved gas scaling relations within the stellar discs of nearby galaxies Open

Seona Lee, Barbara Catinella, T. Westmeier, L. Cortese, Jing Wang , et al. · 2025

Physics Mathematics

The scatter in global atomic hydrogen (H i ) scaling relations is partly attributed to differences in how H i and stellar properties are measured, with H i reservoirs typically extending beyond the inner regions of galaxies where star form…

The distribution of atomic hydrogen in the host galaxies of FRBs Open

H. L. Roxburgh, Marcin Glowacki, Apurba Bera, C. James, Nathan Deg , et al. · 2025

We probe the atomic hydrogen (H i ) emission from the host galaxies of fast radio bursts (FRBs) to investigate the emerging trend of disturbance and asymmetry in the population. Quadrupling the sample size, we detect 16 out of 17 new hosts…

WALLABY Pilot Survey: Gas-rich Galaxy Scaling Relations from Marginally Resolved Kinematic Models Open

Nathan Deg, Nikhil Arora, K. Spekkens, R. Halloran, Barbara Catinella , et al. · 2024

Physics Mathematics

We present the first set of galaxy scaling relations derived from kinematic models of the Widefield Australian Square Kilometer Array Pathfinder (ASKAP) L -band Legacy All-sky Blind surveY (WALLABY) pilot phase observations. Combining the …

WALLABY Pilot Survey: Star Formation Enhancement and Suppression in Gas-rich Galaxy Pairs Open

Qifeng Huang, Jing Wang, X. Lin, Se–Heon Oh, Xinkai Chen , et al. · 2024

Physics Geography

Galaxy interactions can significantly affect the star formation in galaxies, but it remains a challenge to achieve a consensus on the star formation rate (SFR) enhancement in galaxy pairs. Here, we investigate the SFR enhancement of gas-ri…

WALLABY Pilot Survey: Public data release of ~1800 HI sources and high-resolution cut-outs from Pilot Survey Phase 2 Open

C. Murugeshan, Nathan Deg, T. Westmeier, Ao Shen, B. -Q. For , et al. · 2024

Environmental science Computer science Geography

We present the Pilot Survey Phase 2 data release for the Wide-field ASKAP L-band Legacy All-sky Blind surveY (WALLABY), carried-out using the Australian SKA Pathfinder (ASKAP). We present 1760 HI detections (with a default spatial resoluti…

WALLABY Pilot Survey: HI source-finding with a machine learning framework Open

Li Wang, O. Ivy Wong, T. Westmeier, C. Murugeshan, K. Lee-Waddell , et al. · 2024

Computer science Psychology

The data volumes generated by the WALLABY atomic Hydrogen (HI) survey using the Australiian Square Kilometre Array Pathfinder (ASKAP) necessitate greater automation and reliable automation in the task of source-finding and cataloguing. To …

WALLABY pilot survey: the Tully–Fisher relation in the NGC 4808, Vela, and NGC 5044 fields Open

J. R. Mould, T. H. Jarrett, H. M. Courtois, A. Bosma, Nathan Deg , et al. · 2024

Physics

The Tully–Fisher Relation (TFR) is a well-known empirical relationship between the luminosity of a spiral galaxy and its circular velocity, allowing us to estimate redshift independent distances. Here we use high signal-to-noise H i 21-cm …

WALLABY Pilot Survey: the Tully-Fisher relation in the NGC 4808, Vela and NGC 5044 fields Open

J. R. Mould, T. H. Jarrett, H. M. Courtois, A. Bosma, Nathan Deg , et al. · 2024

Physics Computer science

The Tully-Fisher Relation (TFR) is a well-known empirical relationship between the luminosity of a spiral galaxy and its circular velocity, allowing us to estimate redshift independent distances. Here we use high signal-to-noise HI 21-cm i…

WALLABY pilot survey: an ‘almost’ dark cloud near the Hydra cluster Open

T. O’Beirne, L. Staveley‐Smith, O. Ivy Wong, T. Westmeier, G. Batten , et al. · 2024

Physics Geography Computer science

We explore the properties of an ‘almost’ dark cloud of neutral hydrogen (H i) using data from the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY). Until recently, WALLABY J103508 − 283427 (also known as H1032 − 2819 or LEDA 2793457)…

WALLABY Pilot Survey: An 'Almost' Dark Cloud near the Hydra Cluster Open

T. O’Beirne, L. Staveley‐Smith, O. Ivy Wong, T. Westmeier, G. Batten , et al. · 2024

Biology Physics Computer science

We explore the properties of an 'almost' dark cloud of neutral hydrogen (HI) using data from the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY). Until recently, WALLABY J103508-283427 (also known as H1032-2819 or LEDA 2793457) was …

WALLABY Pilot Survey: Public data release of ∼ 1800 H i sources and high-resolution cut-outs from Pilot Survey Phase 2 Open

C. Murugeshan, Nathan Deg, T. Westmeier, Ao Shen, Bi‐Qing For , et al. · 2024

Physics Geology

We present the Pilot Survey Phase 2 data release for the Wide-field ASKAP L-band Legacy All-sky Blind surveY (WALLABY), carried-out using the Australian SKA Pathfinder (ASKAP). We present 1760 H i detections (with a default spatial resolut…

FAST-ASKAP Synergy: Quantifying Coexistent Tidal and Ram Pressure Strippings in the NGC 4636 Group Open

X. Lin, Jing Wang, V. A. Kilborn, Eric W. Peng, L. Cortese , et al. · 2023

Physics Engineering

Combining new H i data from a synergetic survey of Australian Square Kilometre Array Pathfinder (ASKAP) Widefield ASKAP L -band Legacy All-sky Blind surveY and Five-hundred-meter Aperture Spherical radio Telescope with the Arecibo Legacy F…

Orbital Support and Evolution of Flat Profiles of Bars (Shoulders) Open

Leandro Beraldo e Silva, Victor P. Debattista, Stuart Robert Anderson, Monica Valluri, Peter Erwin , et al. · 2023

Physics Medicine

Many barred galaxies exhibit upturns (shoulders) in their bar-major-axis density profile. Simulation studies have suggested that shoulders are supported by looped x 1 orbits, occur in growing bars, and can appear after bar buckling. We inv…

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