Table 3
Observed and modeled properties of the dwarfs and normal galaxies.
| IRS line ratio | Metal-rich sample | Compact DGS sample | |
|
|
|||
| [S iii]33/[S iii]18 | 1.43 (0.14 dex) | 1.53 (0.12 dex) | |
| [S iv]10/[S iii]18 | 0.18 (0.38 dex) | 1.30 (0.42 dex) | |
| [Ne iii]15/[Ne ii]12 | 0.17 (0.35 dex) | 4.90 (0.48 dex) | |
|
|
|||
| Metallicity | 2 ZISM | 0.25 ZISM | |
| Reference ISM abundances (ZISM): | |||
| O/H = 3.2 × 10-4, C/H = 1.4 × 10-4, N/H = 8 × 10-5 | |||
| Ne/H = 1.2 × 10-4, S/H = 3.2 × 10-5 | |||
|
|
|||
| H ii region fiducial model | |||
|
|
|||
| density [cm-3] | 102.5 | 102.0 | |
| log U | − 3.0 | − 2.5 | |
| RS, eff [pc] | 16 | 46 | |
|
|
|||
| PDR fiducial model | |||
|
|
|||
| density [cm-3] | 103.5 | 104.0 | |
| log G0 | 3.3 | 2.7 | |
Notes. Median IRS line ratios with their dispersions in parenthesis, measured as 1.5 times the median absolute deviation in logarithmic space (Dale et al. 2009 and Inami et al. 2013 for the metal-rich galaxies; this work for the low-metallicity, DGS galaxies). ISM abundances are taken from Cowie & Songaila (1986), Savage & Sembach (1996), Meyer et al. (1998). The model parameters of the metal-rich sample are from Dale et al. (2009) and Inami et al. (2013) for the H ii region, and from Malhotra et al. (2001) and Negishi et al. (2001) for the PDR. RS, eff is the effective radius of the H ii region.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.