Dr Kyle Oman's Outputs (33)

WALLABY Pilot Survey and ASymba: Comparing H i Detection Asymmetries to the SIMBA Simulation (2025)
Journal Article
Perron-Cormier, M., Deg, N., Spekkens, K., Richardson, M. L. A., Glowacki, M., Oman, K. A., Verheijen, M. A. W., Hank, N. A. N., Blyth, S., Dénes, H., Rhee, J., Elagali, A., Shen, A. X., Raja, W., Lee-Waddell, K., Cortese, L., Catinella, B., & Westmeier, T. (2025). WALLABY Pilot Survey and ASymba: Comparing H i Detection Asymmetries to the SIMBA Simulation. Astronomical Journal, 169(2), Article 114. https://doi.org/10.3847/1538-3881/ada567

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 atomic gas... Read More about WALLABY Pilot Survey and ASymba: Comparing H i Detection Asymmetries to the SIMBA Simulation.

MHONGOOSE discovery of a gas-rich low surface brightness galaxy in the Dorado group (2024)
Journal Article
Maccagni, F. M., de Blok, W. J. G., Mancera Piña, P. E., Ragusa, R., Iodice, E., Spavone, M., McGaugh, S., Oman, K. A., Oosterloo, T. A., Koribalski, B. S., Kim, M., Adams, E. A. K., Amram, P., Bosma, A., Bigiel, F., Brinks, E., Chemin, L., Combes, F., Gibson, B., Healy, J., …Zijlstra, A. (2024). MHONGOOSE discovery of a gas-rich low surface brightness galaxy in the Dorado group. Astronomy & Astrophysics, 690, A69. https://doi.org/10.1051/0004-6361/202449441

We present the discovery of a low-mass, gas-rich low surface brightness galaxy in the Dorado group, at a distance of 17.7 Mpc. Combining deep MeerKAT 21-cm observations from the MeerKAT H I Observations of Nearby Galactic Objects: Observing Southern... Read More about MHONGOOSE discovery of a gas-rich low surface brightness galaxy in the Dorado group.

MHONGOOSE: A MeerKAT nearby galaxy H I survey (2024)
Journal Article
de Blok, W. J. G., Healy, J., Maccagni, F. M., Pisano, D. J., Bosma, A., English, J., Jarrett, T., Marasco, A., Meurer, G. R., Veronese, S., Bigiel, F., Chemin, L., Fraternali, F., Holwerda, B. W., Kamphuis, P., Klöckner, H. R., Kleiner, D., Leroy, A. K., Mogotsi, M., Oman, K. A., …Zijlstra, A. (2024). MHONGOOSE: A MeerKAT nearby galaxy H I survey. Astronomy & Astrophysics, 688, A109. https://doi.org/10.1051/0004-6361/202348297

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 galaxies to ex... Read More about MHONGOOSE: A MeerKAT nearby galaxy H I survey.

A warm dark matter cosmogony may yield more low-mass galaxy detections in 21-cm surveys than a cold dark matter one (2024)
Journal Article
Oman, K. A., Frenk, C. S., Crain, R. A., Lovell, M. R., & Pfeffer, J. (2024). A warm dark matter cosmogony may yield more low-mass galaxy detections in 21-cm surveys than a cold dark matter one. Monthly Notices of the Royal Astronomical Society, 533(1), 67-78. https://doi.org/10.1093/mnras/stae1772

The 21-cm spectral line widths, w50, of galaxies are an approximate tracer of their dynamical masses, such that the dark matter halo mass function is imprinted in the number density of galaxies as a function of w50. Correcting observed number counts... Read More about A warm dark matter cosmogony may yield more low-mass galaxy detections in 21-cm surveys than a cold dark matter one.

MARTINI: Mock Array Radio Telescope Interferometry ofthe Neutral ISM (2024)
Journal Article
Oman, K. A. (2024). MARTINI: Mock Array Radio Telescope Interferometry ofthe Neutral ISM. The Journal of Open Source Software, 9(98), Article 6860. https://doi.org/10.21105/joss.06860

MARTINI is a modular Python package that takes smoothed-particle hydrodynamics (SPH) simulations of galaxies as input and creates synthetic spatially- and/or spectrally-resolved observations of the 21-cm radio emission line of atomic hydrogen (data c... Read More about MARTINI: Mock Array Radio Telescope Interferometry ofthe Neutral ISM.

ARTEMIS emulator: exploring the effect of cosmology and galaxy formation physics on Milky Way-mass haloes and their satellites (2024)
Journal Article
Brown, S. T., Fattahi, A., McCarthy, I. G., Font, A. S., Oman, K. A., & Riley, A. H. (2024). ARTEMIS emulator: exploring the effect of cosmology and galaxy formation physics on Milky Way-mass haloes and their satellites. Monthly Notices of the Royal Astronomical Society, 532(2), 1223-1240. https://doi.org/10.1093/mnras/stae1378

We present the new ARTEMIS emulator suite of high-resolution (baryon mass of 2.23 × 104h−1 M⊙) zoom-in simulations of Milky Way-mass systems. Here, three haloes from the original ARTEMIS sample have been rerun multiple times, systematically varying p... Read More about ARTEMIS emulator: exploring the effect of cosmology and galaxy formation physics on Milky Way-mass haloes and their satellites.

An overlooked source of uncertainty in the mass of the Milky Way (2024)
Journal Article
Oman, K. A., & Riley, A. H. (2024). An overlooked source of uncertainty in the mass of the Milky Way. Monthly Notices of the Royal Astronomical Society: Letters, 532(1), L48-L55. https://doi.org/10.1093/mnrasl/slae042

Gas and Star Formation in Satellites of Milky Way Analogs (2024)
Journal Article
Jones, M. G., Sand, D. J., Karunakaran, A., Spekkens, K., Oman, K. A., Bennet, P., …Mutlu-Pakdil, B. (2024). Gas and Star Formation in Satellites of Milky Way Analogs. Astrophysical Journal, 966(1), Article 93. https://doi.org/10.3847/1538-4357/ad3076

We have imaged the entirety of eight (plus one partial) Milky Way (MW)–like satellite systems, a total of 42 (45) satellites, from the Satellites Around Galactic Analogs II catalog in both Hα and H i with the Canada–France–Hawaii Telescope and the Ja... Read More about Gas and Star Formation in Satellites of Milky Way Analogs.

Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity (2024)
Journal Article
Sirks, E. L., Harvey, D., Massey, R., Oman, K. A., Robertson, A., Frenk, C., Everett, S., Gill, A. S., Lagattuta, D., & McCleary, J. (2024). Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity. Monthly Notices of the Royal Astronomical Society, 530(3), 3160-3170. https://doi.org/10.1093/mnras/stae1012

Terrestrial particle accelerators collide charged particles, then watch the trajectory of outgoing debris – but they cannot manipulate dark matter. Fortunately, dark matter is the main component of galaxy clusters, which are continuously pulled toget... Read More about Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity.

KURVS: the outer rotation curve shapes and dark matter fractions of z ∼ 1.5 star-forming galaxies (2023)
Journal Article
Puglisi, A., Dudzevičiūtė, U., Swinbank, M., Gillman, S., Tiley, A. L., Bower, R. G., …Sharples, R. M. (2023). KURVS: the outer rotation curve shapes and dark matter fractions of z ∼ 1.5 star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 524(2), 2814-2835. https://doi.org/10.1093/mnras/stad1966

We present first results from the KMOS Ultra-deep Rotation Velocity Survey (KURVS), aimed at studying the outer rotation curves shape and dark matter content of 22 star-forming galaxies at z ∼1.5. These galaxies represent ’typical’ star-forming discs... Read More about KURVS: the outer rotation curve shapes and dark matter fractions of z ∼ 1.5 star-forming galaxies.

The north–south asymmetry of the ALFALFA H i velocity width function (2023)
Journal Article
Brooks, R. A. N., Oman, K. A., & Frenk, C. S. (2023). The north–south asymmetry of the ALFALFA H i velocity width function. Monthly Notices of the Royal Astronomical Society, 522(3), 4043-4058. https://doi.org/10.1093/mnras/stad1191

The number density of extragalactic 21-cm radio sources as a function of their spectral line widths - the HI width function (HIWF) - is a sensitive tracer of the dark matter halo mass function (HMF). The Lambda cold dark matter model predicts that th... Read More about The north–south asymmetry of the ALFALFA H i velocity width function.

Constraining quenching time-scales in galaxy clusters by forward-modelling stellar ages and quiescent fractions in projected phase space (2023)
Journal Article
Reeves, A. M. M., Hudson, M. J., & Oman, K. A. (2023). Constraining quenching time-scales in galaxy clusters by forward-modelling stellar ages and quiescent fractions in projected phase space. Monthly Notices of the Royal Astronomical Society, 522(2), 1779-1799. https://doi.org/10.1093/mnras/stad1069

We forward-model mass-weighted stellar ages (MWAs) and quiescent fractions (fQ) in projected phase space (PPS), using data from the Sloan Digital Sky Survey, to jointly constrain an infall quenching model for galaxies in log (Mvir/M⊙) > 14 galaxy clu... Read More about Constraining quenching time-scales in galaxy clusters by forward-modelling stellar ages and quiescent fractions in projected phase space.

The many reasons that the rotation curves of low-mass galaxies can fail as tracers of their matter distributions (2023)
Journal Article
Downing, E. R., & Oman, K. A. (2023). The many reasons that the rotation curves of low-mass galaxies can fail as tracers of their matter distributions. Monthly Notices of the Royal Astronomical Society, 522(3), 3318-3336. https://doi.org/10.1093/mnras/stad868

It is routinely assumed that galaxy rotation curves are equal to their circular velocity curves (modulo some corrections) such that they are good dynamical mass tracers. We take a visualization-driven approach to exploring the limits of the validity... Read More about The many reasons that the rotation curves of low-mass galaxies can fail as tracers of their matter distributions.

The diversity of rotation curves of simulated galaxies with cusps and cores (2023)
Journal Article
Roper, F. A., Oman, K. A., Frenk, C. S., Benítez-Llambay, A., Navarro, J. F., & Santos-Santos, I. M. E. (2023). The diversity of rotation curves of simulated galaxies with cusps and cores. Monthly Notices of the Royal Astronomical Society, 521(1), 1316-1336. https://doi.org/10.1093/mnras/stad549

We use ΛCDM cosmological hydrodynamical simulations to explore the kinematics of gaseous discs in late-type dwarf galaxies. We create high-resolution 21-cm ’observations’ of simulated dwarfs produced in two variations of the EAGLE galaxy formation mo... Read More about The diversity of rotation curves of simulated galaxies with cusps and cores.

The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package* (2022)
Journal Article
Collaboration, T. A., Price-Whelan, A. M., Lim, P. L., Earl, N., Starkman, N., Bradley, L., Shupe, D. L., Patil, A. A., Corrales, L., Brasseur, C., Nöthe, M., Donath, A., Tollerud, E., Morris, B. M., Ginsburg, A., Vaher, E., Weaver, B. A., Tocknell, J., Jamieson, W., van Kerkwijk, M. H., …Zonca, A. (2022). The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package*. Astrophysical Journal, 935(2), Article 167. https://doi.org/10.3847/1538-4357/ac7c74

The Astropy Project supports and fosters the development of open-source and openly developed Python packages that provide commonly needed functionality to the astronomical community. A key element of the Astropy Project is the core package astropy, w... Read More about The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package*.

Using eagle simulations to study the effect of observational constraints on the determination of H i asymmetries in galaxies (2022)
Journal Article
Bilimogga, P. V., Oman, K. A., Verheijen, M. A., & van der Hulst, T. (2022). Using eagle simulations to study the effect of observational constraints on the determination of H i asymmetries in galaxies. Monthly Notices of the Royal Astronomical Society, 513(4), 5310-5327. https://doi.org/10.1093/mnras/stac1213

We investigate the effect of observational constraints such as signal-to-noise (S/N) ratio, resolution, and column density level on the H I morphological asymmetry (Amod) and the effect of noise on the H I global profile (Aflux) asymmetry indices. Us... Read More about Using eagle simulations to study the effect of observational constraints on the determination of H i asymmetries in galaxies.

The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters (2022)
Journal Article
Sirks, E. L., Oman, K. A., Robertson, A., Massey, R., & Frenk, C. (2022). The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters. Monthly Notices of the Royal Astronomical Society, 511(4), 5927-5935. https://doi.org/10.1093/mnras/stac406

We use the Cluster-EAGLE (C-EAGLE) hydrodynamical simulations to investigate the effects of self-interacting dark matter (SIDM) on galaxies as they fall into clusters. We find that SIDM galaxies follow similar orbits to their cold dark matter (CDM) c... Read More about The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters.

No need for dark matter: resolved kinematics of the ultra-diffuse galaxy AGC 114905 (2021)
Journal Article
Mancera Piña, P. E., Fraternali, F., Oosterloo, T., Adams, E. A., Oman, K. A., & Leisman, L. (2022). No need for dark matter: resolved kinematics of the ultra-diffuse galaxy AGC 114905. Monthly Notices of the Royal Astronomical Society, 512(3), 3230-3242. https://doi.org/10.1093/mnras/stab3491

We present new H I interferometric observations of the gas-rich ultra-diffuse galaxy AGC 114905, which previous work, based on low-resolution data, identified as an outlier of the baryonic Tully–Fisher relation. The new observations, at a spatial res... Read More about No need for dark matter: resolved kinematics of the ultra-diffuse galaxy AGC 114905.

The ALFALFA HI velocity width function (2021)
Journal Article
Oman, K. A. (2022). The ALFALFA HI velocity width function. Monthly Notices of the Royal Astronomical Society, 509(3), 3268-3284. https://doi.org/10.1093/mnras/stab3164

We make the most precise determination to date of the number density of extragalactic 21-cm radio sources as a function of their spectral line widths – the H I velocity width function (H I WF) – based on 21 827 sources from the final 7000deg2 data re... Read More about The ALFALFA HI velocity width function.

Star formation histories of Coma cluster galaxies matched to simulated orbits hint at quenching around first pericenter (2021)
Journal Article
Upadhyay, A., Oman, K., & Trager, S. (2021). Star formation histories of Coma cluster galaxies matched to simulated orbits hint at quenching around first pericenter. Astronomy & Astrophysics, 652, Article A16. https://doi.org/10.1051/0004-6361/202141036

Context. The star formation in galaxies in present-day clusters has almost entirely been shut down, but the exact mechanism that quenched these galaxies is still uncertain. Aims. By tracing the orbital and star formation histories of galaxies within... Read More about Star formation histories of Coma cluster galaxies matched to simulated orbits hint at quenching around first pericenter.