Buchumschlag

The Galactic Center arms inferred from the ALMA CMZ Exploration Survey (ACES)

Analyzing longitude-velocity diagrams (LVDs) in the CS (J = 2-1) and H$^{13}$CN (J = 1-0) molecular lines from the internal release data of the ALMA Central Molecular Zone (CMZ) Exploration Survey and in the $^{13}$CO (J = 1-0) line from the Nobeyama Galactic Center (GC) survey, we identify six GC a...

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Hauptverfasser: Sofue, Yoshiaki (VerfasserIn) , Oka, Tomoharu (VerfasserIn) , Longmore, Steven N (VerfasserIn) , Walker, Daniel (VerfasserIn) , Ginsburg, Adam (VerfasserIn) , Henshaw, Jonathan D (VerfasserIn) , Bally, John (VerfasserIn) , Barnes, Ashley T (VerfasserIn) , Battersby, Cara (VerfasserIn) , Colzi, Laura (VerfasserIn) , Ho, Paul (VerfasserIn) , Jimenez-Serra, Izaskun (VerfasserIn) , Kruijssen, J M Diederik (VerfasserIn) , Mills, Elizabeth (VerfasserIn) , Petkova, Maya A (VerfasserIn) , Sormani, Mattia C (VerfasserIn) , Wallace, Jen (VerfasserIn) , Armijos-Abendaño, Jairo (VerfasserIn) , Dutkowska, Katarzyna M (VerfasserIn) , Enokiya, Rei (VerfasserIn) , Fukui, Yasuo (VerfasserIn) , García, Pablo (VerfasserIn) , Guzman, Andres (VerfasserIn) , Henkel, Christian (VerfasserIn) , Hsieh, Pei-Ying (VerfasserIn) , Hu, Yue (VerfasserIn) , Immer, Katharina (VerfasserIn) , Jeff, Desmond (VerfasserIn) , Klessen, Ralf S. (VerfasserIn) , Kohno, Kotaro (VerfasserIn) , Krumholz, Mark R (VerfasserIn) , Lipman, Dani (VerfasserIn) , Morris, Mark R (VerfasserIn) , Nogueras-Lara, Francisco (VerfasserIn) , Nonhebel, M (VerfasserIn) , Ott, Jürgen (VerfasserIn) , Pineda, Jaime E (VerfasserIn) , Martín, Sergio (VerfasserIn) , Requena-Torres, Miguel Angel (VerfasserIn) , Rivilla, Víctor M (VerfasserIn) , Riquelme-Vásquez, Denise (VerfasserIn) , Sánchez-Monge, Álvaro (VerfasserIn) , Santa-Maria, Miriam G (VerfasserIn) , Smith, Howard A (VerfasserIn) , Tanvir, Tabassum S (VerfasserIn) , Tolls, Volker (VerfasserIn) , Wang, Q Daniel (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: August 2025
In: Publications of the Astronomical Society of Japan
Year: 2025, Jahrgang: 77, Heft: 4, Pages: 687-706
ISSN:2053-051X
DOI:10.1093/pasj/psaf034
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1093/pasj/psaf034
Volltext
Verfasserangaben:Yoshiaki Sofue, Tomoharu Oka, Steven N. Longmore, Daniel Walker, Adam Ginsburg, Jonathan D. Henshaw, John Bally, Ashley T. Barnes, Cara Battersby, Laura Colzi, Paul Ho, Izaskun Jimenez-Serra, J.M. Diederik Kruijssen, Elizabeth Mills, Maya A. Petkova, Mattia C. Sormani, Jen Wallace, Jairo Armijos-Abendaño, Katarzyna M. Dutkowska, Rei Enokiya, Yasuo Fukui, Pablo García, Andres Guzman, Christian Henkel, Pei-Ying Hsieh, Yue Hu, Katharina Immer, Desmond Jeff, Ralf S. Klessen, Kotaro Kohno, Mark R. Krumholz, Dani Lipman, Mark R. Morris, Francisco Nogueras-Lara, M. Nonhebel, Jürgen Ott, Jaime E. Pineda, Sergio Martín, Miguel Angel Requena-Torres, Víctor M. Rivilla, Denise Riquelme-Vásquez, Álvaro Sánchez-Monge, Miriam G. Santa-Maria, Howard A. Smith, Tabassum S. Tanvir, Volker Tolls, and Q. Daniel Wang
Beschreibung
Zusammenfassung:Analyzing longitude-velocity diagrams (LVDs) in the CS (J = 2-1) and H$^{13}$CN (J = 1-0) molecular lines from the internal release data of the ALMA Central Molecular Zone (CMZ) Exploration Survey and in the $^{13}$CO (J = 1-0) line from the Nobeyama Galactic Center (GC) survey, we identify six GC arms as prominent straight LV ridges. In addition to the currently known Arms I to IV, we identify a new inner arm, Arm V, and further highlight the circumnuclear disk (CND) as Arm VI. Integrated intensity maps of the arms on the sky suggest that most of the arms compose ring-like structures inclined from the Galactic plane. We determine the radii (curvatures) of the arms using the velocity-gradient ($dv/dl$) method, assuming that the arms are rotating in circular orbits at a constant velocity of $\sim$150 km s$^{-1}$. We show that Arms I and II compose the main ring structure of the CMZ with radii $\sim$100-120 pc; Arm III is a dense arm 42 pc from the GC; Arm IV is a clear and narrow arm 20 pc from the GC; and Arm V is a faint, long arm of 8.2 pc radius. We show that the CND comprises the sixth arm, Arm VI, of radius $\sim$2.3 pc associated with bifurcated spiral fins. We also discuss the association of the 20 and 50 km s$^{-1}$ clouds with these arms. The radii of the arms fall on an empirical relation $R\sim 630 (2/5)^N$ for $N=1$ (Arm I) to 6 (VI), suggesting discrete rings or a logarithmic spiral with pitch angle ${\sim }22^{\circ }$. The vertical full extent of the arm increases with radius and is represented by $z\sim 0.7 (R/1 {\rm \ pc} )^{0.7}$ pc. The tilt angle of the arms from the Galactic plane, or the warping, increases rapidly toward the GC.
Beschreibung:Veröffentlicht: 11. Juni 2025
Gesehen am 29.10.2025
Beschreibung:Online Resource
ISSN:2053-051X
DOI:10.1093/pasj/psaf034

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