Ionized gas in quiescent galaxies: Temperature measurement and constraint on the ionization source

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Volume 690 (October 2024)

A&A, 690 (2024) A83

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Table 5.

Density and temperature derived from different line ratios.

Indicators (Unit: cm⁻³ for n and 10⁴ for T)	High [N II]/Hα	Mid [N II]/Hα	Low [N II]/Hα
n_e from [S II] λ6731/[S II] λ6716	45.20 $_{- 9.68}^{+ 12.32}$ $^{+12.32}_{-9.68}$	57.52 $_{- 12.32}^{+ 9.53}$ $^{+9.53}_{-12.32}$	42.33 $_{- 10.49}^{+ 10.37}$ $^{+10.37}_{-10.49}$
T_[O III] from [O III] λ4363/[O III] λ5007	3.17 $_{- 0.51}^{+ 0.63}$ $^{+0.63}_{-0.51}$	2.19 $_{- 0.48}^{+ 0.56}$ $^{+0.56}_{-0.48}$	< 1.54
T_[N II] from [N II] λ5755/[N II] λ6583	< 0.9	< 0.99	< 1.18
T_[S II] from [S II] λλ4068, 4076/[S II] λλ6716, 6731	0.94 $_{- 0.04}^{+ 0.04}$ $^{+0.04}_{-0.04}$	0.98 $_{- 0.04}^{+ 0.04}$ $^{+0.04}_{-0.04}$	1.02 $_{- 0.06}^{+ 0.06}$ $^{+0.06}_{-0.06}$
T_[O II] from [O II] λλ7320, 7330/[O II] λλ3727, 3729	1.38 $_{- 0.11}^{+ 0.12}$ $^{+0.12}_{-0.11}$	1.33 $_{- 0.05}^{+ 0.06}$ $^{+0.06}_{-0.05}$	1.33 $_{- 0.06}^{+ 0.07}$ $^{+0.07}_{-0.06}$

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