Shock-induced HCNH+ abundance enhancement in the heart of the starburst galaxy NGC 253 unveiled by ALCHEMI

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Volume 696 (April 2025)

A&A, 696 (2025) A31

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Table 2

Physical parameters of the selected GMCs.

		LTE			RADEX

Target (1)	$N_{H_{2}}$ ${N_{{{\rm{H}}_2}}}$ (cm−2) (2)	T_rot (K) (3)	$N_{{HCHN}^{+}}$ ${N_{{\rm{HCH}}{{\rm{N}}^ + }}}$ (cm⁻²) (4)	$X_{{HCHN}^{+}}$ ${X_{{\rm{HCH}}{{\rm{N}}^ + }}}$ (5)	$N_{{HCHN}^{+}}$ ${N_{{\rm{HCH}}{{\rm{N}}^ + }}}$ (cm⁻²) (6)	$X_{{HCHN}^{+}}$ ${X_{{\rm{HCH}}{{\rm{N}}^ + }}}$ (7)	T_K (K) (8)	$\log_{10} [n_{H_{2}}]$ ${\log _{10}}\left[ {{n_{{{\rm{H}}_2}}}} \right]$ (cm⁻³) (9)
GMC1	(5.0 ± 1.1) × 10²²	17.4 ± 2.5	(1.0 ± 0.1) × 10¹⁵	(2.0 ± 0.5) × 10⁻⁸	${4.0}_{- 0.7}^{+ 0.9} \times 10^{14}$ $4.0_{ - 0.7}^{ + 0.9} \times {10^{14}}$	${8.6}_{- 2.5}^{+ 2.4} \times 10^{- 9}$ $8.6_{ - 2.5}^{ + 2.4} \times {10^{ - 9}}$	${249.83}_{- 117.63}^{+ 101.35}$ $249.83_{ - 117.63}^{ + 101.35}$	${3.10}_{- 0.16}^{+ 0.17}$ $3.10_{ - 0.16}^{ + 0.17}$
GMC2	(6.5 ± 1.2) × 10²²	12.9 ± 1.8	(8.3 ± 1.3) × 10¹⁴	(1.3 ± 0.3) × 10⁻⁸	${3.2}_{- 0.7}^{+ 1.1} \times 10^{14}$ $3.2_{ - 0.7}^{ + 1.1} \times {10^{14}}$	${5.4}_{- 1.7}^{+ 1.7} \times 10^{- 9}$ $5.4_{ - 1.7}^{ + 1.7} \times {10^{ - 9}}$	${240.34}_{- 121.93}^{+ 110.20}$ $240.34_{ - 121.93}^{ + 110.20}$	${3.01}_{- 0.23}^{+ 0.23}$ $3.01_{ - 0.23}^{ + 0.23}$
GMC3	(2.2 ± 0.5) × 10²³	17.7 ± 1.4	(3.0 ± 0.2) × 10¹⁵	(1.4 ± 0.3) × 10⁻⁸	${9.8}_{- 1.0}^{+ 1.2} \times 10^{14}$ $9.8_{ - 1.0}^{ + 1.2} \times {10^{14}}$	${4.8}_{- 1.2}^{+ 1.1} \times 10^{- 9}$ $4.8_{ - 1.2}^{ + 1.1} \times {10^{ - 9}}$	${278.12}_{- 106.70}^{+ 83.78}$ $278.12_{ - 106.70}^{ + 83.78}$	${3.23}_{- 0.11}^{+ 0.12}$ $3.23_{ - 0.11}^{ + 0.12}$
GMC4	(4.3 ± 0.8) × 10²³	19.0 ± 1.5	(2.9 ± 0.2) × 10¹⁵	(6.7 ± 1.3) × 10⁻⁹	${7.2}_{- 0.6}^{+ 0.8} \times 10^{14}$ $7.2_{ - 0.6}^{ + 0.8} \times {10^{14}}$	${1.8}_{- 0.4}^{+ 0.4} \times 10^{- 9}$ $1.8_{ - 0.4}^{ + 0.4} \times {10^{ - 9}}$	${252.49}_{- 132.07}^{+ 102.07}$ $252.49_{ - 132.07}^{ + 102.07}$	${3.55}_{- 0.15}^{+ 0.22}$ $3.55_{ - 0.15}^{ + 0.22}$
GMC6	(6.3 ± 1.8) × 10²³	20.9 ± 1.7	(4.0 ± 0.2) × 10¹⁵	(6.3 ± 1.8) × 10⁻⁹	${1.2}_{- 0.1}^{+ 0.1} \times 10^{15}$ $1.2_{ - 0.1}^{ + 0.1} \times {10^{15}}$	${2.1}_{- 0.6}^{+ 0.6} \times 10^{- 9}$ $2.1_{ - 0.6}^{ + 0.6} \times {10^{ - 9}}$	${256.86}_{- 123.33}^{+ 99.19}$ $256.86_{ - 123.33}^{ + 99.19}$	${3.46}_{- 0.11}^{+ 0.17}$ $3.46_{ - 0.11}^{ + 0.17}$
GMC7	(1.8 ± 0.3) × 10²³	19.2 ± 2.0	(2.1 ± 0.2) × 10¹⁵	(1.2 ± 0.2) × 10⁻⁸	${6.7}_{- 0.7}^{+ 0.8} \times 10^{14}$ $6.7_{ - 0.7}^{ + 0.8} \times {10^{14}}$	${3.9}_{- 0.8}^{+ 0.7} \times 10^{- 9}$ $3.9_{ - 0.8}^{ + 0.7} \times {10^{ - 9}}$	${250.09}_{- 117.32}^{+ 102.97}$ $250.09_{ - 117.32}^{ + 102.97}$	${3.35}_{- 0.13}^{+ 0.17}$ $3.35_{ - 0.13}^{ + 0.17}$
GMC8	(5.9 ± 1.1) × 10²²	13.1 ± 1.7	(9.5 ± 1.2) × 10¹⁴	(1.6 ± 0.4) × 10⁻⁸	${4.5}_{- 1.5}^{+ 3.6} \times 10^{14}$ $4.5_{ - 1.5}^{ + 3.6} \times {10^{14}}$	${9.4}_{- 4.5}^{+ 4.9} \times 10^{- 9}$ $9.4_{ - 4.5}^{ + 4.9} \times {10^{ - 9}}$	${254.10}_{- 118.16}^{+ 103.16}$ $254.10_{ - 118.16}^{ + 103.16}$	${2.80}_{- 0.33}^{+ 0.27}$ $2.80_{ - 0.33}^{ + 0.27}$
GMC9	(5.4 ± 1.1) × 10²²	13.9 ± 2.1	(9.9 ± 1.5) × 10¹⁴	(1.8 ± 0.5) × 10⁻⁸	${3.1}_{- 0.7}^{+ 1.1} \times 10^{14}$ $3.1_{ - 0.7}^{ + 1.1} \times {10^{14}}$	${6.3}_{- 2.1}^{+ 2.1} \times 10^{- 9}$ $6.3_{ - 2.1}^{ + 2.1} \times {10^{ - 9}}$	${245.05}_{- 119.90}^{+ 107.46}$ $245.05_{ - 119.90}^{ + 107.46}$	${3.16}_{- 0.23}^{+ 0.25}$ $3.16_{ - 0.23}^{ + 0.25}$

Notes. (1) Selected GMC. (2) Beam-averaged H₂ column density for a circular beam of 1.″6, taken from Tanaka et al. (2024). (3) Rotational temperature. (4) Beam-averaged HCNH⁺ column density, again for a circular beam of 1.″6. (5) HCNH⁺ abundance. (6) Beam-averaged HCNH⁺ column density. (7) Non-LTE HCNH⁺ abundance. (8) Kinetic temperature. (9) H₂ number density.

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