ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)

@misc{lipman2026aces,
  title = {{ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)}},
  author = {Dani R. Lipman and Jakub Poznanski and Savannah R. Gramze and Claire E. Cook and Cara Battersby and Jennifer Wallace and Pablo García and Samantha Adams and Xinyu Mai and Kai Smith and Natalie Butterfield and Sophia Kempe and Adam Ginsburg and Rojita Buddhacharya and Tomoharu Oka and Danya Alboslani and Jairo Armijos-Abendaño and John Bally and Ashley T. Barnes and Nazar Budaiev and Alyssa Bulatek and Laura Colzi and Christoph Federrath and Zi-Xuan Feng and Jonathan D. Henshaw and Paul Ho and Pei-Ying Hsieh and Katharina Immer and Izaskun Jiménez-Serra and Ralf S. Klessen and Steven N. Longmore and Xing Lu and Elisabeth A. C. Mills and N. Bijas and Francisco Nogueras-Lara and Dylan M. Paré and Maya A. Petkova and Jaime E. Pineda and Marc W. Pound and Víctor M. Rivilla and Álvaro Sánchez-Monge and Miriam G. Santa-Maria and Anika Schmiedeke and Yoshiaki Sofue and Mattia C. Sormani and Howard A. Smith and Robin G. Tress and Daniel Walker and Qizhou Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.10472},
  eprint = {2609.10472},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.10472},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)
AU  - Dani R. Lipman
AU  - Jakub Poznanski
AU  - Savannah R. Gramze
AU  - Claire E. Cook
AU  - Cara Battersby
AU  - Jennifer Wallace
AU  - Pablo García
AU  - Samantha Adams
AU  - Xinyu Mai
AU  - Kai Smith
AU  - Natalie Butterfield
AU  - Sophia Kempe
AU  - Adam Ginsburg
AU  - Rojita Buddhacharya
AU  - Tomoharu Oka
AU  - Danya Alboslani
AU  - Jairo Armijos-Abendaño
AU  - John Bally
AU  - Ashley T. Barnes
AU  - Nazar Budaiev
AU  - Alyssa Bulatek
AU  - Laura Colzi
AU  - Christoph Federrath
AU  - Zi-Xuan Feng
AU  - Jonathan D. Henshaw
AU  - Paul Ho
AU  - Pei-Ying Hsieh
AU  - Katharina Immer
AU  - Izaskun Jiménez-Serra
AU  - Ralf S. Klessen
AU  - Steven N. Longmore
AU  - Xing Lu
AU  - Elisabeth A. C. Mills
AU  - N. Bijas
AU  - Francisco Nogueras-Lara
AU  - Dylan M. Paré
AU  - Maya A. Petkova
AU  - Jaime E. Pineda
AU  - Marc W. Pound
AU  - Víctor M. Rivilla
AU  - Álvaro Sánchez-Monge
AU  - Miriam G. Santa-Maria
AU  - Anika Schmiedeke
AU  - Yoshiaki Sofue
AU  - Mattia C. Sormani
AU  - Howard A. Smith
AU  - Robin G. Tress
AU  - Daniel Walker
AU  - Qizhou Zhang
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.10472
UR  - https://arxiv.org/abs/2609.10472
AB  - The extreme kinematics of the Milky Way's Central Molecular Zone (CMZ) are influenced by processes such as dynamical shearing, cloud collisions, and stellar feedback. These events are visible in molecular data as vertically spiked features in position-velocity (PV) diagrams referred to as high velocity dispersion compact clouds (HVCCs). Using ALMA CMZ Exploration Survey (ACES) CS (2-1) molecular data, we identify a total of 235 HVCC candidates, 163 of which are visually identified, and an additional 72 identified via automated dendrogram methods. For each HVCC we catalog and report the physical and kinematic properties, explore line ratios of the cold dense gas tracer \HNCO with C-shock tracers, classify the morphology of their PV diagrams, and view their position-position-velocity distribution. The sample includes structures which are compact (d<5 pc) and have large velocity extents (20 km/s <ΔV < 140 km/s), with most structures showing thin, `spiked' PV morphologies. We highlight areas of high ratios between HNCO and C-shock tracers along the edge of known orbital streams, implying a buildup of bar lane gas accreting onto the CMZ. We also find a collection of HVCCs overlapping with the 50 km/s cloud and known circumnuclear disk features. This catalog will be used for future investigation of nuclear inflow and determining dominant mechanisms disrupting average CMZ gas flows.
ER  -