Imperial College London
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Prof. Christina Fotopoulou

Faculty of Medicine, Department of Surgery & Cancer

Chair in Gynaecological Cancer Surgery
 
 
 
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Contact

 

c.fotopoulou

 
 
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Location

 

Institute of Reproductive and Developmental BiologyHammersmith Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bisbas:2022:1538-4357/ac7960,
author = {Bisbas, TG and Walch, S and Naab, T and Lahén, N and Herrera-Camus, R and Steinwandel, UP and Fotopoulou, CM and Hu, CY and Johansson, PH},
doi = {1538-4357/ac7960},
journal = {Astrophysical Journal},
title = {The Origin of the [C ii] Deficit in a Simulated Dwarf Galaxy Merger-driven Starburst},
url = {http://dx.doi.org/10.3847/1538-4357/ac7960},
volume = {934},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present [C ii] synthetic observations of smoothed particle hydrodynamics (SPH) simulations of a dwarf galaxy merger. The merging process varies the star formation rate (SFR) by more than three orders of magnitude. Several star clusters are formed, the feedback of which disperses and unbinds the dense gas through expanding H ii regions and supernova (SN) explosions. For galaxies with properties similar to the modeled ones, we find that the [C ii] emission remains optically thin throughout the merging process. We identify the warm neutral medium ( 3 < log T gas < 4 with χ HI > 2χ H2) to be the primary source of [C ii] emission (∼58% contribution), although at stages when the H ii regions are young and dense (during star cluster formation or SNe in the form of ionized bubbles), they can contribute 50% to the total [C ii] emission. We find that the [C ii]/far-IR (FIR) ratio decreases owing to thermal saturation of the [C ii] emission caused by strong far-UV radiation fields emitted by the massive star clusters, leading to a [C ii] deficit medium. We investigate the [C ii]−SFR relation and find an approximately linear correlation that agrees well with observations, particularly those from the Dwarf Galaxy Survey. Our simulation reproduces the observed trends of [C ii]/FIR versus ΣSFR and ΣFIR, and it agrees well with the Kennicutt relation of SFR−FIR luminosity. We propose that local peaks of [C ii] in resolved observations may provide evidence for ongoing massive cluster formation.
AU  - Bisbas,TG
AU  - Walch,S
AU  - Naab,T
AU  - Lahén,N
AU  - Herrera-Camus,R
AU  - Steinwandel,UP
AU  - Fotopoulou,CM
AU  - Hu,CY
AU  - Johansson,PH
DO  - 1538-4357/ac7960
PY  - 2022///
SN  - 0004-637X
TI  - The Origin of the [C ii] Deficit in a Simulated Dwarf Galaxy Merger-driven Starburst
T2  - Astrophysical Journal
UR  - http://dx.doi.org/10.3847/1538-4357/ac7960
VL  - 934
ER  -
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