Do Post-Starburst Galaxies Host Compact Molecular Gas Reservoirs?
arXiv:2210.06522 · doi:10.1093/mnrasl/slac128
Abstract
We analysed the high-resolution (up to 0.2") ALMA CO (2-1) and 1.3 mm dust continuum data of eight gas-rich post-starburst galaxies (PSBs) in the local Universe, six of which had been studied by Smercina et al. (2022). In contrast to this study reporting the detections of extraordinarily compact (i.e., unresolved) reservoirs of molecular gas in the six PSBs, our visibility-plane analysis resolves the CO (2-1) emission in all eight PSBs with effective radii () of kpc, typically consisting of gaseous components at both circumnuclear and extended disc scales. With this new analysis, we find that the CO sizes of gas-rich PSBs are compact with respect to their stellar sizes (median ratio ), but comparable to the sizes of the gas discs seen in local luminous infrared galaxies (LIRGs) and early-type galaxies. We also find that the CO-to-stellar size ratio of gas-rich PSBs is potentially correlated with the gas depletion time scale, placing them as transitional objects between LIRGs and early-type galaxies from an evolutionary perspective. Finally, the star formation efficiency of the observed PSBs appear consistent with those of star-forming galaxies on the Kennicutt-Schmidt relation, showing no sign of suppressed star formation from turbulent heating.
arXiv comment6 pages, 4 figures, accepted for publication in MNRAS Letter
References in corpus (28)
- On the variation of the Initial Mass Function
- The Global Schmidt Law in Star Forming Galaxies
- Star Formation in the Milky Way and Nearby Galaxies
- The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
- A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
- Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
- Molecular Gas at High Redshift
- Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
- The CALIFA survey across the Hubble sequence: Spatially resolved stellar population properties in galaxies
- Cloud-Scale Molecular Gas Properties in 15 Nearby Galaxies
- The Atlas3D project - XIV. The extent and kinematics of molecular gas in early-type galaxies
- The molecular gas in Luminous Infrared Galaxies I: CO lines, extreme physical conditions, and their drivers
- The star formation history of CALIFA galaxies: Radial structures
- The EDGE-CALIFA Survey: Interferometric Observations of 126 Galaxies with CARMA
- The total infrared luminosity may significantly overestimate the star formation rate of recently quenched galaxies
- Revisiting the Integrated Star Formation Law. Paper I: Non-Starbursting Galaxies
- Discovery of Large Molecular Gas Reservoirs in Post-Starburst Galaxies
- Revisiting the Integrated Star Formation Law. II. Starbursts and the Combined Global Schmidt Law
- VLT/VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: 2D kinematic properties
- The evolution of the cold interstellar medium in galaxies following a starburst
- Clocking the Evolution of Post-Starburst Galaxies: Methods and First Results
- Massive Compact Galaxies with High-Velocity Outflows: Morphological Analysis and Constraints on AGN Activity
- Evolution Through the Post-Starburst Phase: Using Post-Starburst Galaxies as Laboratories for Understanding the Processes that Drive Galaxy Evolution
- After The Fall: The Dust and Gas in E+A Post-Starburst Galaxies
- Post-Starburst Galaxies in SDSS-IV MaNGA
- After The Fall: Resolving the Molecular Gas in Post-Starburst Galaxies
- The Evolution of the Interstellar Medium in Post-Starburst Galaxies
- ALMA 1.3 mm Survey of Lensed Submillimeter Galaxies (SMGs) Selected by Herschel: Discovery of Spatially Extended SMGs and Implications