Star Formation and ISM Properties in Local U/ LIRGs at GMC scales with ALMA
| Main Author: | Barcos-Munoz, Loreto |
|---|---|
| Format: | Proceeding poster |
| Terbitan: |
, 2019
|
| Online Access: |
https://zenodo.org/record/3585346 |
Daftar Isi:
- Luminous and ultra luminous infrared galaxies (LIRGs and ULIRGs) are one of the best local laboratories to study physics at an extreme regime, potentially helping us understand similar processes happening in the early universe where high physical resolution observations are hard to achieve. U/LIRGs show star formation rates of up to a few 100 solar masses per year concentrated into their central kpc. Due to the large amounts of gas and dust surrounding their central regions, direct observations of the nuclei are often impossible at many wavelengths. Radio and sub-mm emission are key to study their star formation and ISM properties. I will show high resolution (<40 pc), resolved ALMA Band 3 observations of the closest and most iconic ULIRG, Arp 220. I will show the distribution of dense molecular gas tracers (HCN and HCO+), and other gas tracers such as HC3N, H13CN, etc., from each nuclei of Arp 220, and the new challenges these detailed observations bring into the field. I will include results from cloud identification and analysis, along with kinematic modeling of the dense gas emission. With HCN and HCO+ in hand, I will show the distribution of their ratio as a function of radius and the implications of its use as an AGN diagnostic. Finally, I will present the first 3D morphology of the molecular outflow present in the western nucleus, and its properties. I will complement the findings in Arp 220 with recent results from high angular resolution observations of CO (1-0) and 3mm continuum emission from other six U/LIRGs, from which we also have high angular resolution JVLA 33 GHz continuum data that serve as an aid for the interpretation of our ALMA observations.