3-D CMZ IV: Distinguishing Near vs. Far Distances in the Galactic Center Using Spitzer and Herschel
arXiv:2410.17321 · doi:10.3847/1538-4357/adb5ee
Abstract
A comprehensive 3-D model of the central 300 pc of the Milky Way, the Central Molecular Zone (CMZ) is of fundamental importance in understanding energy cycles in galactic nuclei, since the 3-D structure influences the location and intensity of star formation, feedback, and black hole accretion. Current observational constraints are insufficient to distinguish between existing 3-D models. Dust extinction is one diagnostic tool that can help determine the location of dark molecular clouds relative to the bright Galactic Center emission. By combining Herschel and Spitzer observations, we developed three new dust extinction techniques to estimate the likely near/far locations for each cloud in the CMZ. We compare our results to four geometric CMZ orbital models. Our extinction methods show good agreement with each other, and with results from spectral line absorption analysis from Walker et al. (submitted). Our near/far results for CMZ clouds are inconsistent with a projected version of the Sofue (1995) two spiral arms model, and show disagreement in position-velocity space with the Molinari et al. (2011) closed elliptical orbit. Our results are in reasonable agreement with the Kruijssen et al. (2015) open streams. We find that a simplified toy-model elliptical orbit which conserves angular momentum shows promising fits in both position-position and position-velocity space. We conclude that all current CMZ orbital models lack the complexity needed to describe the motion of gas in the CMZ, and further work is needed to construct a complex orbital model to accurately describe gas flows in the CMZ.
Accepted by ApJ; 38 pages; Project series website with relevant code, data, and results: https://centralmolecularzone.github.io/3D_CMZ/
References in corpus (28)
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- MAMBO Mapping of Spitzer c2d Small Clouds and Cores
- Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
- The dynamical evolution of molecular clouds near the Galactic Centre - I. Orbital structure and evolutionary timeline
- Herschel-Planck dust optical-depth and column-density maps: I. Method description and results for Orion
- Turbulence sets the initial conditions for star formation in high-pressure environments
- Mapping the Milky Way bulge at high resolution: the 3D dust extinction, CO, and X factor maps
- Mass inflow rate into the Central Molecular Zone: observational determination and evidence of episodic accretion
- Seeding the Galactic Centre gas stream: gravitational instabilities set the initial conditions for the formation of protocluster clouds
- Ubiquitous velocity fluctuations throughout the molecular interstellar medium
- Dynamically Driven Inflow onto the Galactic Center and its Effect upon Molecular Clouds
- Dense molecular gas properties on 100 pc scales across the disc of NGC 3627
- The ALMOND Survey: Molecular cloud properties and gas density tracers across 25 nearby spiral galaxies with ALMA
- The Comparison of Physical Properties Derived from Gas and Dust in a Massive Star-Forming Region
- Magnetic field morphology and evolution in the Central Molecular Zone and its effect on gas dynamics
- 3D shape explains star formation mystery of California and Orion A
- Three-Dimensional Observations of H_2 Emission around Sgr A East - I. Structure in the Central 10 Parsecs of Our Galaxy
- Distance to three molecular clouds in the central molecular zone
- Three-Dimensional Structure of the Central Molecular Zone
- AzTEC Survey of the Central Molecular Zone: Data Reduction, Analysis, and Preliminary Results
- ALMA uncovers highly filamentary structure towards the Sgr E region
- Evidence of a Cloud-Cloud Collision from Overshooting Gas in the Galactic Center
- Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
- A new distance to the Brick, the dense molecular cloud G0.253+0.016
- Distance to the Brick cloud using stellar kinematics
- Dust extinction map of the Galactic plane based on the VVV survey data
- A high-resolution extinction mapping technique for face-on disc galaxies
- Determination of the mass function of extra-galactic GMCs via NIR color maps. Testing the method in a disk-like geometry