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: 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…

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…

Looking at the Distant Universe with the MeerKAT Array: The H i Mass Function in the Local Universe Open

Amir Kazemi-Moridani, A. J. Baker, Marc Verheijen, Eric Gawiser, S.-L. Blyth , et al. · 2025

Physics Biology

We present measurements of the neutral atomic hydrogen (H i ) mass function (H i MF) and cosmic H i density (Ω H I ) at 0 ≤ z ≤ 0.088 from the Looking at the Distant Universe with MeerKAT Array (LADUMA) survey. Using LADUMA Data Release 1 …

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…

The CRAFT coherent (CRACO) upgrade I: System description and results of the 110-ms radio transient pilot survey Open

Ziteng Wang, K. W. Bannister, Vivek Gupta, Xiao-Dong Deng, M. A. Pilawa , et al. · 2025

Physics Computer science History

We present the first results from a new backend on the Australian Square Kilometre Array Pathfinder, the Commensal Realtime ASKAP Fast Transient COherent (CRACO) upgrade. CRACO records millisecond time resolution visibility data, and searc…

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 first large absorption survey in H i (FLASH): II. Pilot survey data release and first results Open

Hyein Yoon, E. M. Sadler, E. K. Mahony, J. N. H. S. Aditya, J. R. Allison , et al. · 2025

Physics

The First Large Absorption Survey in H i (FLASH) is a large-area radio survey for neutral hydrogen in and around galaxies in the intermediate redshift range $0.4\lt z\lt1.0$ , using the 21-cm H i absorption line as a probe of cold neutral …

Looking At the Distant Universe with the MeerKAT Array: the HI Mass Function in the Local Universe Open

Amir Kazemi-Moridani, A. J. Baker, Marc Verheijen, Eric Gawiser, S.-L. Blyth , et al. · 2024

Physics Biology

We present measurements of the neutral atomic hydrogen (HI) mass function (HIMF) and cosmic HI density ($Ω_{\rm HI}$) at $0 \leq z \leq 0.088$ from the Looking at the Distant Universe with MeerKAT Array (LADUMA) survey. Using LADUMA Data R…

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: 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 …

The First Large Absorption Survey in HI (FLASH): II. Pilot Survey data release and first results Open

Hyein Yoon, E. M. Sadler, E. K. Mahony, J. N. H. S. Aditya, J. R. Allison , et al. · 2024

Environmental science Chemistry Computer science

The First Large Absorption Survey in HI (FLASH) is a large-area radio survey for neutral hydrogen in the redshift range 0.41$, and appear to be a mixture of intervening and associated systems. Interestingly, around two-thirds of the lines …

MHONGOOSE: A MeerKAT nearby galaxy H I survey Open

W. J. G. de Blok, J. Healy, F. M. Maccagni, D. J. Pisano, A. Bosma , et al. · 2024

Physics

The MHONGOOSE (MeerKAT H I Observations of Nearby Galactic Objects: Observing Southern Emitters) survey maps the distribution and kinematics of the neutral atomic hydrogen (H I ) gas in and around 30 nearby star-forming spiral and dwarf ga…

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…

The Detection of an Extremely Bright Fast Radio Burst in a Phased Array Feed Survey Open

K. W. Bannister, R. M. Shannon, Jean‐Pierre Macquart, Chris Flynn, P. G. Edwards , et al. · 2024

Computer science

We report the detection of an ultra-bright fast radio burst (FRB) from a modest, 3.4-day pilot survey with the Australian Square Kilometre Array Pathfinder. The survey was conducted in a wide-field fly's-eye configuration using the phased-…

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…

WALLABY pre-pilot survey: ultra-diffuse galaxies in the Eridanus supergroup Open

Bi‐Qing For, Kristine Spekkens, L. Staveley‐Smith, Kenji Bekki, Ananthan Karunakaran , et al. · 2023

Physics Mathematics

We present a pilot study of the atomic neutral hydrogen gas (H i) content of ultra-diffuse galaxy (UDG) candidates. In this paper, we use the pre-pilot Eridanus field data from the Widefield ASKAP L-band Legacy All-sky Blind Survey to sear…

WALLABY Pre-Pilot Survey: Ultra-Diffuse Galaxies in the Eridanus Supergroup Open

Bi‐Qing For, Kristine Spekkens, L. Staveley‐Smith, Kenji Bekki, Ananthan Karunakaran , et al. · 2023

Physics Mathematics

We present a pilot study of the atomic neutral hydrogen gas (HI) content of ultra-diffuse galaxy (UDG) candidates. In this paper, we use the pre-pilot Eridanus field data from the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY…

WALLABY pilot survey: the potential polar ring galaxies NGC 4632 and NGC 6156 Open

Nathan Deg, R Palleske, Kristine Spekkens, Jing Wang, T. H. Jarrett , et al. · 2023

Physics

We report on the discovery of two potential polar ring galaxies (PRGs) in the WALLABY Pilot Data Release 1 (PDR1). These untargeted detections, cross-matched to NGC 4632 and NGC 6156, are some of the first galaxies where the H i observatio…

On the origin of the anomalous gas, non-declining rotation curve, and disc asymmetries in NGC 253 Open

Xuanyi Lyu, T. Westmeier, G. R. Meurer, D. J. Hanish · 2023

Physics Biology Mathematics

We present a multiwavelength (from far-ultraviolet to ${\rm H}\, \rm {\small I}$ emission) study of star formation feedback on the kinematics of the interstellar medium in the Sculptor galaxy, NGC 253. Its three well-known features (a disr…

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