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An ALMA Comprehensive High-resolution Extragalactic Molecular Inventory of NGC253
Image Credit: NAOJ: Subaru, NASA & ESA: Hubble, ESO: VLT & Danish 1.5-m;
The ALCHEMI Project
The ALCHEMI Project
The ALMA Comprehensive High-Resolution Extragalactic Molecular Inventory (ALCHEMI) was an ALMA Cycle 5 Large Programme designed to image the circumnuclear zone (CMZ: 850x340 pc) of the nearby starburst galaxy NGC253 from 84 to 163 GHz (Bands 3 and 4) and from 211 to 373 GHz (Bands 6 and 7) at 1.6 arcsec (27pc) spatial resolution. An ALMA Cycle 6 project was added to ALCHEMI to augment its capabilities with 1.6 arcsec imaging of the NGC253 CMZ at ALMA Band 5 (163 to 211 GHz: ALMA Project 2018.1.00162.S).
A Sampling of ALCHEMI Results
A Sampling of ALCHEMI Results
Neural Network Modeling of the NGC253 CMZ
Neural Network Modeling of the NGC253 CMZ
Erica Behrens (UVa/NRAO) has developed a neural network model of the HCN and HNC physics and chemistry in the NGC253 CMZ.
The H3O+/SO Abundance Ratio as a Tracer of Cosmic Rays
The H3O+/SO Abundance Ratio as a Tracer of Cosmic Rays
Jon Holdship (Leiden Observatory) led this effort to characterize the sensitivity of the H3O+ and SO abundances to changes in the cosmic ray ionization rate.
Shock-Induced HCNH+ Abundance Enhancement
Shock-Induced HCNH+ Abundance Enhancement
Yang Gong (Purple Mountain Observatory) modeled the physics and chemistry in the NGC253 CMZ to show that shock excitation enhances the abundance of this molecular ion in NGC253.
Reconstructing the Shock History of the NGC253 CMZ
Reconstructing the Shock History of the NGC253 CMZ
Monica Huang (Leiden Observatory) developed a physical and chemical model of the HNCO and SiO emission in NGC253 which points to the importance of shock excitation at various epochs in the history of the star NGC253 CMZ.
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