MeerKAT HI imaging of the jellyfish galaxy ESO 137-001

We present MeerKAT observations of ESO,137-001, a quintessential jellyfish galaxy with long multi-phase tails formed due to the interaction with the intra-cluster medium of its host galaxy cluster, ACO,3627. Our observations reveal the presence of in both the disc and outer regions of the galaxy for...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2025-01
Hauptverfasser: Ramatsoku, M., Serra, P., Sun, M., Smirnov, O.M., Makhathini, S.
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Sprache:eng
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Zusammenfassung:We present MeerKAT observations of ESO,137-001, a quintessential jellyfish galaxy with long multi-phase tails formed due to the interaction with the intra-cluster medium of its host galaxy cluster, ACO,3627. Our observations reveal the presence of in both the disc and outer regions of the galaxy for the first time, with a total mass of ($3.5 ± 0.4) ESO,137-001 is at an advanced stage of gas stripping; it is extremely deficient and seems to have lost 90% of its initial mass; about 2/3 of the surviving is found at larger radius than expected for a normal disc and forms ∼40,kpc tail coincident with the tail detected at other wavelengths. Only ∼10% of the surviving is still found within the stellar disc, consistent with the expectation of an outside-in truncation due to ram pressure. Similarly to other jellyfish galaxies, ESO137-001 has a high star formation rate for the low amount of detected. We measure an depletion time of 0.29 Gyr. However, when taking into account the total gas ( + H_2) content, the depletion time is consistent with typical values measured in nearby spiral galaxies. This suggests that ESO,137-001 is at its current stage of ram pressure interaction characterised by an efficient stripping, rather than an enhanced conversion of to H_2, which was recently observed in some other jellyfish galaxies.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/202451050