Possible origins of anomalous H I gas around MHONGOOSE galaxy, NGC 5068

被引：5

作者：

Healy, J. ^{[1
]}

de Blok, W. J. G. ^{[1
,2
,3
]}

Maccagni, F. M. ^{[1
,4
]}

Amram, P. ^{[5
]}

Chemin, L. ^{[6
]}

Combes, F. ^{[7
,8
]}

Holwerda, B. W. ^{[9
]}

Kamphuis, P. ^{[10
]}

Pisano, D. J. ^{[3
]}

Schinnerer, E. ^{[11
]}

Spekkens, K. ^{[12
,13
]}

Verdes-Montenegro, L. ^{[14
]}

Walter, F. ^{[11
]}

Adams, E. A. K. ^{[1
,2
]}

Gibson, B. K. ^{[15
]}

Kleiner, D. ^{[1
,4
]}

Veronese, S. ^{[1
,2
]}

Zabel, N. ^{[3
]}

English, J. ^{[16
]}

Carignan, C. ^{[3
,17
,18
]}

机构：

[1] Netherlands Inst Radio Astron ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[2] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[3] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa

[4] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[5] Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frederic Joliot Curie, F-13338 Marseille, France

[6] Univ Andres Bello, Fac Ciencias Exactas, Inst Astrofis, Talcahuano, Chile

[7] Sorbonne Univ, PSL Res Univ, LERMA, Observ Paris,CNRS, F-75104 Paris, France

[8] Coll France, 11,Pl Marcelin Berthelot, F-75005 Paris, France

[9] Univ Louisville, Dept Phys & Astron, 102 Nat Sci Bldg, Louisville, KY 40292 USA

[10] Ruhr Univ Bochum, Astron Inst AIRUB, Fac Phys & Astron, D-44780 Bochum, Germany

[11] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[12] Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000 Stn Forces, Kingston, ON K7K 7B4, Canada

[13] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[14] Inst Astrofis Andalucia CSIC, Glorieta Astron S-N, Granada 18008, Spain

[15] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[16] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[17] Univ Montreal, Dept Phys, Complexe Sci MIL, 1375 Ave Therese-Lavoie-Roux, Montreal, PQ H2V 0B3, Canada

[18] Observ Astrophys Univ Ouaga I Pr Joseph Ki Zerbo O, Lab Phys & Chim Environm, BP 7021, Ouaga, Burkina Faso

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 687卷

基金：

欧洲研究理事会; 新加坡国家研究基金会; 加拿大自然科学与工程研究理事会;

关键词：

galaxies: evolution; galaxies: ISM; galaxies: individual: NGC 5068; radio lines: ISM; HIGH-VELOCITY CLOUDS; STAR-FORMATION; NEUTRAL GAS; CALIBRATION ARTIFACTS; RADIO INTERFEROMETRY; EXTRAPLANAR GAS; ROTATION CURVES; NEARBY GALAXIES; MINOR MERGERS; DARK-MATTER;

D O I：

10.1051/0004-6361/202347475

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The existing reservoirs of neutral atomic hydrogen gas (H I) in galaxies are insufficient to have maintained the observed levels of star formation without some kind of replenishment. This refuelling of the H I reservoirs is likely to occur at column densities an order of magnitude lower than previous observational limits (NH I, limit similar to 1019 cm(-2) at a 30 '' resolution over a linewidth of 20 km s(-1)). In this paper, we present recent deep H I observations of NGC 5068, a nearby isolated star-forming galaxy observed by MeerKAT as part of the MHONGOOSE survey. With these new data, we were able to detect low column density H I around NGC 5068 with a 3 sigma detection limit of NH I = 6.4 x 10(17 )cm(-2) at a 90 '' resolution over a 20 km s(-1) linewidth. The high sensitivity and resolution of the MeerKAT data reveal a complex morphology of the H I in this galaxy - a regularly rotating inner disk coincident with the main star-forming disk of the galaxy, a warped outer disk of low column density gas (NH I < 9 x 10(19 )cm(-2)), in addition to clumps of gas on the north-western side of the galaxy. We employed a simple two disk model that described the inner and outer disks, which enabled us to identify anomalous gas that deviates from the rotation of the main galaxy. The morphology and the kinematics of the anomalous gas suggest a possible extra-galactic origin. We explore a number of possible origin scenarios that may explain the anomalous gas, and conclude that fresh accretion is the most likely scenario.

引用

页数：16

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