Anomalous gas in ESO 149-G003: a MeerKAT-16 view

Józsa, G. I. G.; Thorat, K.; Kamphuis, P.; Sebokolodi, Lerato; Maina, Eric; Wang, Jing; Pieterse, D. L. A.; Groot, P.; Ramaila, A. J. T.; Serra, P.; Andati, Lexy A. L.; Blok, W. J. G. de; Hugo, B.; Kleiner, D.; Maccagni, F. M.; Makhathini, S.; Molnár, D. Cs.; Ramatsoku, M.; Smirnov, O.; Bloemen, S.; Paterson, K.; Vreeswijk, P.M.; McBride, V. A.; Klein-Wolt, M.; Woudt, P. A.; Körding, Elmar; Poole, R. Le; Goedhart, S.; Passmoor, S. S.; Serylak, M.; Dettmar, R.-J.

doi:10.1093/mnras/staa3770

Cited by 12 publications

(6 citation statements)

References 117 publications

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“…3D techniques have two main advantages relative to 2D ones: first, they allow for more complicated morphological and kinematic models to be applied to deep, high-resolution data (e.g. Józsa et al 2009;Khoperskov et al 2014;Di Teodoro & Peek 2021;Józsa et al 2021); and second, they can be robustly applied at lower spatial resolutions and across a wider range of disk geometries than in 2D (e.g. Kamphuis et al 2015;Di Teodoro & Fraternali 2015;Lewis 2019;Jones et al 2021).…”

Section: Tilted-ring Modellingmentioning

confidence: 99%

WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

Deg

Spekkens

Westmeier

et al. 2022

Publ. Astron. Soc. Aust.

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We present the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) Pilot Phase I Hi kinematic models. This first data release consists of Hi observations of three fields in the direction of the Hydra and Norma clusters, and the NGC 4636 galaxy group. In this paper, we describe how we generate and publicly release flat-disk tilted-ring kinematic models for 109/592 unique Hi detections in these fields. The modelling method adopted here—which we call the WALLABY Kinematic Analysis Proto-Pipeline (WKAPP) and for which the corresponding scripts are also publicly available—consists of combining results from the homogeneous application of the FAT and 3DBarolo algorithms to the subset of 209 detections with sufficient resolution and $S/N$ in order to generate optimised model parameters and uncertainties. The 109 models presented here tend to be gas rich detections resolved by at least 3–4 synthesised beams across their major axes, but there is no obvious environmental bias in the modelling. The data release described here is the first step towards the derivation of similar products for thousands of spatially resolved WALLABY detections via a dedicated kinematic pipeline. Such a large publicly available and homogeneously analysed dataset will be a powerful legacy product that that will enable a wide range of scientific studies.

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Section: Tilted-ring Modellingmentioning

confidence: 99%

WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

Deg

Spekkens

Westmeier

et al. 2022

Publ. Astron. Soc. Aust.

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“…The centre of the model, the systemic velocity, and the dispersion were fitted to be constant with radius. After attempting several combinations of parameters, and calculating errors as described in Józsa et al (2021), we arrive at a slightly warped disk with a parametrization as shown in Fig. 7.…”

Section: Line Of Sight Absorption Towards Pks 2020-370mentioning

confidence: 99%

Mapping H i 21-cm in the Klemola 31 group at z = 0.029: emission and absorption towards PKS 2020−370

Maina

Mohapatra

Józsa

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present MeerKAT Absorption Line Survey (MALS) observations of the H i gas in the Klemola 31 galaxy group (z = 0.029), located along the line of sight to the radio-loud quasar PKS 2020-370 (z = 1.048). Four galaxies of the group are detected in H i emission, and H i absorption is also detected in front of PKS 2020-370 in Klemola 31A. The emission and absorption are somewhat compensating on the line of sight of the quasar, and the derived column density of the absorption appears under-estimated, with respect to the neighbouring emission. A symmetric tilted-ring model of Klemola 31A, assuming the absorbing gas in regular rotation in the plane, yields a rather high spin temperature of 530 K. An alternative interpretation is that the absorbing gas is extra-planar, which will also account for its non-circular motion. The Na i/Ca ii ratio also suggests that the absorbing gas is unrelated to cold H i disk. Two of the galaxies in the Klemola group are interacting with a small companion, and reveal typical tidal tails, and velocity perturbations. Only one of the galaxies, ESO 400-13, reveals a strong H i deficiency, and a characteristic ram-pressure stripping, with a total asymmetry in the distribution of its gas. Since a small galaxy group as Klemola 31 is not expected to host a dense intra-group gas, this galaxy must be crossing the group at a very high velocity, mostly in the sky plane.

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“…Although CARACal was initially developed to reduce data from MeerKAT, its scope has been broadened to allow data processing from any other radio telescopes. Examples of peer-reviewed papers using CARACal include Ianjamasimanana et al (2020), de Blok et al (2020, Józsa et al (2021).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

The extended HI halo of NGC 4945 as seen by MeerKAT

Ianjamasimanana,

Koribalski,

Józsa

et al. 2022

Preprint

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Observations of the neutral atomic hydrogen (H i) in the nuclear starburst galaxy NGC 4945 with MeerKAT are presented. We find a large amount of halo gas, previously missed by H i observations, accounting for 6.8% of the total H i mass. This is most likely gas blown into the halo by star formation. Our maps go down to a 3σ column density level of 5 × 10 18 cm −2 . We model the H i distribution using tilted-ring fitting techniques and find a warp on the galaxy's approaching and receding sides. The H i in the northern side of the galaxy appears to be suppressed. This may be the result of ionisation by the starburst activity in the galaxy, as suggested by a previous study. The origin of the warp is unclear but could be due to past interactions or ram pressure stripping. Broad, asymmetric H i absorption lines extending throughout the H i emission velocity channels are present towards the nuclear region of NGC 4945. Such broad lines suggest the existence of a nuclear ring moving at a high circular velocity. This is supported by the clear rotation patterns in the H i absorption velocity field. The asymmetry of the absorption spectra can be caused by outflows or inflows of gas in the nuclear region of NGC 4945. The continuum map shows small extensions on both sides of the galaxy's major axis that might be signs of outflows resulting from the starburst activity.

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Anomalous gas in ESO 149-G003: a MeerKAT-16 view

Cited by 12 publications

References 117 publications

WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

WALLABY Pilot Survey: Public release of HI kinematic models for more than 100 galaxies from phase 1 of ASKAP pilot observations

Mapping H i 21-cm in the Klemola 31 group at z = 0.029: emission and absorption towards PKS 2020−370

The extended HI halo of NGC 4945 as seen by MeerKAT

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