| Title: |
The Fate of the Interstellar Medium in Early-type Galaxies. V. Active Galactic Nucleus Feedback from Optical Spectral Classification |
| Authors: |
Ryzhov, Oleh; Michalowski, Michal J.; Nadolny, J.; Hjorth, J.; Lesniewska, A.; Solar, M.; Nowaczyk, P.; Gall, C.; Takeuchi, T. T. |
| Source: |
Ryzhov , O , Michalowski , M J , Nadolny , J , Hjorth , J , Lesniewska , A , Solar , M , Nowaczyk , P , Gall , C & Takeuchi , T T 2025 , ' The Fate of the Interstellar Medium in Early-type Galaxies. V. Active Galactic Nucleus Feedback from Optical Spectral Classification ' , Astrophysical Journal , vol. 276 , no. 2 , 55 . https://doi.org/10.3847/1538-4365/ad93cd |
| Publication Year: |
2025 |
| Collection: |
University of Copenhagen: Research / Forskning ved Københavns Universitet |
| Subject Terms: |
Digital sky survey; Star-formation; Data release; Observational evidence; Retired galaxies; Bright galaxies; Manga galaxies; Host galaxies; Molecular gas; Black-holes |
| Description: |
Quenching of star formation plays a fundamental role in galaxy evolution. This process occurs due to the removal of the cold interstellar medium (ISM) or stabilization against collapse, so that gas cannot be used in the formation of new stars. In this paper, we study the effect of different mechanisms of ISM removal. In particular, we revised the well-known Baldwin-Philips-Terlevich (BPT) and EWH alpha versus [N ii]/H alpha (WHAN) emission-line ratio diagnostics, so that we could classify all galaxies, even those not detected at some emission lines, introducing several new spectral classes. We use spectroscopic data and several physical parameters of 2409 dusty early-type galaxies in order to find out the dominant ionization source (active galactic nuclei, AGNs, young massive stars, hot low-mass evolved stars, HOLMES) and its effect on the ISM. We find that strong AGNs can play a significant role in the ISM removal process only for galaxies with ages lower than 109.4 yr, but we cannot rule out the influence of weak AGNs at any age. For older galaxies, HOLMES/planetary nebulae contribute significantly to the ISM removal process. Additionally, we provide the BPT and WHAN classifications not only for the selected sample but also for all 300,000 galaxies in the Galaxy And Mass Assembly survey fields. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| DOI: |
10.3847/1538-4365/ad93cd |
| Availability: |
https://researchprofiles.ku.dk/da/publications/89fb429d-6608-493c-92b6-df12a98af6ea; https://doi.org/10.3847/1538-4365/ad93cd; https://curis.ku.dk/ws/files/514914477/Ryzhov_2025_ApJS_276_55.pdf |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.5860CCC8 |
| Database: |
BASE |