ALMA Central molecular zone Exploration Survey (ACES) VI: ALMA Large Program Reveals a Highly Filamentary Central Molecular Zone
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ID: 316980
2026
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Abstract
Abstract The Central Molecular Zone (CMZ) of the Milky Way is the way station that primarily controls how much gas flows from the disk of the Galaxy towards the central nucleus. While this region is well documented to have extreme gas properties that clearly distinguish it from the rest of the Galaxy, the properties of the bulk molecular gas at high angular resolution are relatively unexplored. Band 3 data from the ALMA (Atacama Large Millimeter/Submillimeter Array) large program ACES (ALMA CMZ Exploration Survey) reveal the highly filamentary nature of CMZ molecular gas at high resolution (3″or ~0.1 pc) across the entire CMZ. Visual inspection of these data suggests that there are at least two general classes of elongated structures, which we identify as: i) large-scale (≳ 10 pc) filamentary structures (LFs) and ii) a ubiquitous population of small-scale (~1 pc) filamentary structures (SFs), both with widths (FWHM) of about 0.1 pc. We present detailed morphological and kinematic properties towards three structures in each category, as well as their association with magnetic fields and the correlation of HNCO 4(0,4)–3(0,3)with other molecular species. Our investigation reveals that these structures are largely coherent in position-position-velocity space. The alignment with the magnetic field structure is mixed, with some parallel, some perpendicular, and some intermediate alignments. We find that LFs likely trace pieces of contiguous CMZ orbital structures and are a manifestation of global CMZ dynamics. The second class, SFs, are pervasive and may be the result of complicated turbulence and shearing dynamics in the CMZ gas flows, as seen in numerical simulations.
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| Authors | Cara Battersby, Miriam G. Santa-Maria, Dani Lipman, Dylan M. Paré, R.C. Lee, P Garcia, Izaskun Jiménez-Serra, Xing Pan, Daniel L. Walker, Jack Sullivan, Danya Alboslani, H Perry Hatchfield, Yue Hu, Alex Lazarian, J. Wallace, Qizhou Zhang, Xing Lu, Elisabeth A C Mills, Adam Ginsburg, Ashley T Barnes, Pei-Ying Hsieh, Jonathan D Henshaw, S N Longmore, John Bally, Laura Colzi, Paul T P Ho, Maya A Petkova, Mattia C Sormani, N Bijas, Alyssa Bulatek, Natalie Butterfield, Christoph Federrath, Simon C O Glover, Mark Gorski, Savannah R. Gramze, C Henkel, Janik Karoly, Ralf S Klessen, S Martín, Francisco Nogueras-Lara, Jaime E Pineda, Denise Riquelme-Vásquez, Víctor M Rivilla, A. Sanchez-Monge, A. Schmiedeke, Yoshiaki Sofue, Volker Tolls |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1119
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| URL | |
| Keywords | Keywords not found |
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