MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group

B. Namumba; B. S. Koribalski; G. I. G. Józsa; K. Lee-Waddell; M. G. Jones; C. Carignan; L. Verdes-Montenegro; R. Ianjamasimanana; W. J. G. de Blok; M. Cluver; J. Garrido; S. Sánchez-Expósito; A. J. T. Ramaila; K. Thorat; L. A. L. Andati; B. V. Hugo; D. Kleiner; P. Kamphuis; P. Serra; O. M. Smirnov; F. M. Maccagni; S. Makhathini; D. Cs. Molnár; S. Perkins; M. Ramatsoku; S. V. White; F. Loi

doi:10.1093/mnras/stab1524

MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group

B. Namumba, B. S. Koribalski, G. I. G. Józsa, K. Lee-Waddell, M. G. Jones, C. Carignan, L. Verdes-Montenegro, R. Ianjamasimanana, W. J. G. de Blok, M. Cluver, J. Garrido, S. Sánchez-Expósito, A. J. T. Ramaila, K. Thorat, L. A. L. Andati, B. V. Hugo, D. Kleiner, P. Kamphuis, P. Serra, O. M. SmirnovF. M. Maccagni, S. Makhathini, D. Cs. Molnár, S. Perkins, M. Ramatsoku, S. V. White, F. Loi

Western Sydney University

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H I) around the core triplet galaxies in the nearby NGC 7232 galaxy group with MeerKAT. With a physical resolution of âˆ¼1 kpc, we detect a complex web of low-surface-brightness HI emission down to a 4Ïƒ column density level of âˆ¼1 ÃƒÂ— 1019 cm-2 (over 44 km s-1). The newly discovered HI streams extend over âˆ¼20 arcmin corresponding to 140 kpc in projection. This is approximately three times the HI extent of the galaxy triplet (52 kpc). The HI debris has an HI mass of âˆ¼6.6 ÃƒÂ— 109 MâŠ™, more than 50 per cent of the total HI mass of the triplet. Within the galaxy triplet, NGC 7233 and NGC 7232 have lost a significant amount of HI while NGC 7232B appears to have an excess of HI. TheHI deficiency in NGC 7232 and NGC 7233 indicates that galaxÃƒÂ¿Cgalaxy interaction in the group concentrates on this galaxy pair while the other disc galaxies have visited them over time. In comparison to the AMIGA sample of isolated galaxies, we find that with regards to its total HI mass the NGC 7232/3 galaxy triplet is not HI-deficient. Despite the many interactions associated to the triplet galaxies, no HI seems to have been lost from the group (yet).

Original language	English
Pages (from-to)	3795-3809
Number of pages	15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	505
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stab1524
Publication status	Published - 2021

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10.1093/mnras/stab1524

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Namumba, B., Koribalski, B. S., Józsa, G. I. G., Lee-Waddell, K., Jones, M. G., Carignan, C., Verdes-Montenegro, L., Ianjamasimanana, R., de Blok, W. J. G., Cluver, M., Garrido, J., Sánchez-Expósito, S., Ramaila, A. J. T., Thorat, K., Andati, L. A. L., Hugo, B. V., Kleiner, D., Kamphuis, P., Serra, P., ... Loi, F. (2021). MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group. Monthly Notices of the Royal Astronomical Society, 505(3), 3795-3809. https://doi.org/10.1093/mnras/stab1524

@article{e3811955c686482b85bd9f5260d4a2f5,

title = "MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group",

abstract = "We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H I) around the core triplet galaxies in the nearby NGC 7232 galaxy group with MeerKAT. With a physical resolution of {\^a}ˆ¼1 kpc, we detect a complex web of low-surface-brightness HI emission down to a 4{\"I}ƒ column density level of {\^a}ˆ¼1 {\~A}ƒ{\^A}— 1019 cm-2 (over 44 km s-1). The newly discovered HI streams extend over {\^a}ˆ¼20 arcmin corresponding to 140 kpc in projection. This is approximately three times the HI extent of the galaxy triplet (52 kpc). The HI debris has an HI mass of {\^a}ˆ¼6.6 {\~A}ƒ{\^A}— 109 M{\^a}{\v S}{\texttrademark}, more than 50 per cent of the total HI mass of the triplet. Within the galaxy triplet, NGC 7233 and NGC 7232 have lost a significant amount of HI while NGC 7232B appears to have an excess of HI. TheHI deficiency in NGC 7232 and NGC 7233 indicates that galax{\~A}ƒ{\^A}¿Cgalaxy interaction in the group concentrates on this galaxy pair while the other disc galaxies have visited them over time. In comparison to the AMIGA sample of isolated galaxies, we find that with regards to its total HI mass the NGC 7232/3 galaxy triplet is not HI-deficient. Despite the many interactions associated to the triplet galaxies, no HI seems to have been lost from the group (yet).",

author = "B. Namumba and Koribalski, {B. S.} and J{\'o}zsa, {G. I. G.} and K. Lee-Waddell and Jones, {M. G.} and C. Carignan and L. Verdes-Montenegro and R. Ianjamasimanana and {de Blok}, {W. J. G.} and M. Cluver and J. Garrido and S. S{\'a}nchez-Exp{\'o}sito and Ramaila, {A. J. T.} and K. Thorat and Andati, {L. A. L.} and Hugo, {B. V.} and D. Kleiner and P. Kamphuis and P. Serra and Smirnov, {O. M.} and Maccagni, {F. M.} and S. Makhathini and Moln{\'a}r, {D. Cs.} and S. Perkins and M. Ramatsoku and White, {S. V.} and F. Loi",

year = "2021",

doi = "10.1093/mnras/stab1524",

language = "English",

volume = "505",

pages = "3795--3809",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Namumba, B, Koribalski, BS, Józsa, GIG, Lee-Waddell, K, Jones, MG, Carignan, C, Verdes-Montenegro, L, Ianjamasimanana, R, de Blok, WJG, Cluver, M, Garrido, J, Sánchez-Expósito, S, Ramaila, AJT, Thorat, K, Andati, LAL, Hugo, BV, Kleiner, D, Kamphuis, P, Serra, P, Smirnov, OM, Maccagni, FM, Makhathini, S, Molnár, DC, Perkins, S, Ramatsoku, M, White, SV & Loi, F 2021, 'MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 3, pp. 3795-3809. https://doi.org/10.1093/mnras/stab1524

TY - JOUR

T1 - MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group

AU - Namumba, B.

AU - Koribalski, B. S.

AU - Józsa, G. I. G.

AU - Lee-Waddell, K.

AU - Jones, M. G.

AU - Carignan, C.

AU - Verdes-Montenegro, L.

AU - Ianjamasimanana, R.

AU - de Blok, W. J. G.

AU - Cluver, M.

AU - Garrido, J.

AU - Sánchez-Expósito, S.

AU - Ramaila, A. J. T.

AU - Thorat, K.

AU - Andati, L. A. L.

AU - Hugo, B. V.

AU - Kleiner, D.

AU - Kamphuis, P.

AU - Serra, P.

AU - Smirnov, O. M.

AU - Maccagni, F. M.

AU - Makhathini, S.

AU - Molnár, D. Cs.

AU - Perkins, S.

AU - Ramatsoku, M.

AU - White, S. V.

AU - Loi, F.

PY - 2021

Y1 - 2021

N2 - We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H I) around the core triplet galaxies in the nearby NGC 7232 galaxy group with MeerKAT. With a physical resolution of âˆ¼1 kpc, we detect a complex web of low-surface-brightness HI emission down to a 4Ïƒ column density level of âˆ¼1 ÃƒÂ— 1019 cm-2 (over 44 km s-1). The newly discovered HI streams extend over âˆ¼20 arcmin corresponding to 140 kpc in projection. This is approximately three times the HI extent of the galaxy triplet (52 kpc). The HI debris has an HI mass of âˆ¼6.6 ÃƒÂ— 109 MâŠ™, more than 50 per cent of the total HI mass of the triplet. Within the galaxy triplet, NGC 7233 and NGC 7232 have lost a significant amount of HI while NGC 7232B appears to have an excess of HI. TheHI deficiency in NGC 7232 and NGC 7233 indicates that galaxÃƒÂ¿Cgalaxy interaction in the group concentrates on this galaxy pair while the other disc galaxies have visited them over time. In comparison to the AMIGA sample of isolated galaxies, we find that with regards to its total HI mass the NGC 7232/3 galaxy triplet is not HI-deficient. Despite the many interactions associated to the triplet galaxies, no HI seems to have been lost from the group (yet).

AB - We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H I) around the core triplet galaxies in the nearby NGC 7232 galaxy group with MeerKAT. With a physical resolution of âˆ¼1 kpc, we detect a complex web of low-surface-brightness HI emission down to a 4Ïƒ column density level of âˆ¼1 ÃƒÂ— 1019 cm-2 (over 44 km s-1). The newly discovered HI streams extend over âˆ¼20 arcmin corresponding to 140 kpc in projection. This is approximately three times the HI extent of the galaxy triplet (52 kpc). The HI debris has an HI mass of âˆ¼6.6 ÃƒÂ— 109 MâŠ™, more than 50 per cent of the total HI mass of the triplet. Within the galaxy triplet, NGC 7233 and NGC 7232 have lost a significant amount of HI while NGC 7232B appears to have an excess of HI. TheHI deficiency in NGC 7232 and NGC 7233 indicates that galaxÃƒÂ¿Cgalaxy interaction in the group concentrates on this galaxy pair while the other disc galaxies have visited them over time. In comparison to the AMIGA sample of isolated galaxies, we find that with regards to its total HI mass the NGC 7232/3 galaxy triplet is not HI-deficient. Despite the many interactions associated to the triplet galaxies, no HI seems to have been lost from the group (yet).

UR - https://hdl.handle.net/1959.7/uws:66741

U2 - 10.1093/mnras/stab1524

DO - 10.1093/mnras/stab1524

M3 - Article

SN - 0035-8711

VL - 505

SP - 3795

EP - 3809

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group

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