A new measurement of the Galactic 12C/13C gradient from sensitive HCO+ absorption observations

Open Access

Table C.1

Source name, velocity, galactocentric distance, integrated optical depths, isotopic ratios, and RMS of the absorption spectra.

Source	V_lsr	R_GC	$\int τ_{H^{12} {C O}^{+}} d v$ $\[\int \tau_{\mathrm{H}^{12} \mathrm{CO}^{+}} d v\]$	$\int τ_{H^{13} {C O}^{+}} d v$ $\[\int \tau_{\mathrm{H}^{13} \mathrm{CO}^{+}} d v\]$	$N_{H^{12} {C O}^{+}} / N_{H^{13} {C O}^{+}}$ $\[N_{\mathrm{H}^{12} \mathrm{CO}^{+}} / N_{\mathrm{H}^{13} \mathrm{CO}^{+}}\]$	RMS
	km s⁻¹	kpc	km s⁻¹	km s⁻¹		10⁻³
I15254-5621	-54.0±0.7	${6.0}_{- 0.2}^{+ 0.2}$ $\[6.0_{-0.2}^{+0.2}\]$	1.944±0.017	0.019±0.007	101.8±37.4	11.7
I15254-5621	-30.4±0.3	${6.8}_{- 0.2}^{+ 0.2}$ $\[6.8_{-0.2}^{+0.2}\]$	3.166±0.023	0.038±0.010	82.1±21.5	11.7
I15502-5302	-75.3±0.8	${5.1}_{- 0.2}^{+ 0.1}$ $\[5.1_{-0.2}^{+0.1}\]$	1.787±0.013	0.038±0.003	46.0±4.0	9.0
I15502-5302	-40.0±0.3	${6.3}_{- 0.2}^{+ 0.2}$ $\[6.3_{-0.2}^{+0.2}\]$	8.526±0.048	0.127±0.006	65.1±3.0	9.0
I15567-5236	-86.6±2.3	${4.7}_{- 0.2}^{+ 0.1}$ $\[4.7_{-0.2}^{+0.1}\]$	7.101±0.130	0.072±0.026	96.6±35.0	30.9
I15567-5236	-65.9±1.4	${5.3}_{- 0.1}^{+ 0.2}$ $\[5.3_{-0.1}^{+0.2}\]$	3.254±0.047	0.060±0.021	52.9±18.2	30.9
I15567-5236	-46.0±1.6	${6.0}_{- 0.2}^{+ 0.2}$ $\[6.0_{-0.2}^{+0.2}\]$	12.476±0.307	0.197±0.024	61.6±7.7	30.9
I15567-5236	-16.4±1.0	${7.3}_{- 0.2}^{+ 0.2}$ $\[7.3_{-0.2}^{+0.2}\]$	11.112±0.489	0.091±0.026	118.4±34.0	30.9
I16060-5146	-80.0±0.5	${4.7}_{- 0.2}^{+ 0.2}$ $\[4.7_{-0.2}^{+0.2}\]$	2.381 ±0.011	0.037±0.003	62.6±4.7	4.5
I16060-5146	-56.7±0.2	${5.5}_{- 0.2}^{+ 0.2}$ $\[5.5_{-0.2}^{+0.2}\]$	10.094±0.022	0.159±0.005	62.0±2.0	4.5
I16164-5046	-48.0±1.5	${5.7}_{- 0.2}^{+ 0.2}$ $\[5.7_{-0.2}^{+0.2}\]$	5.727±0.126	0.106±0.005	52.5±2.7	8.9
I16164-5046	-38.7±0.3	${6.1}_{- 0.2}^{+ 0.2}$ $\[6.1_{-0.2}^{+0.2}\]$	2.976±0.016	0.043±0.005	67.5±8.3	8.9
I16164-5046	-22.5±0.2	${6.8}_{- 0.2}^{+ 0.2}$ $\[6.8_{-0.2}^{+0.2}\]$	1.676±0.009	0.032±0.004	50.9±7.1	8.9
I16172-5028	-41.3±0.4	${5.9}_{- 0.2}^{+ 0.2}$ $\[5.9_{-0.2}^{+0.2}\]$	6.853±0.043	0.096±0.006	69.5±4.4	8.0
I18479-0005	70.8±0.6	${5.2}_{- 0.1}^{+ 0.2}$ $\[5.2_{-0.1}^{+0.2}\]$	6.478±0.036	0.113±0.012	55.7±6.1	11.7
I18507+0110	11.6±0.2	${7.6}_{- 0.2}^{+ 0.2}$ $\[7.6_{-0.2}^{+0.2}\]$	4.714±0.056	0.074±0.006	62.0±4.8	11.4
I18507+0110	27.3±0.4	${6.9}_{- 0.2}^{+ 0.2}$ $\[6.9_{-0.2}^{+0.2}\]$	2.579±0.027	0.029±0.005	87.7±14.2	11.4
I18507+0110	48.3±0.4	${6.0}_{- 0.2}^{+ 0.2}$ $\[6.0_{-0.2}^{+0.2}\]$	3.619±0.021	0.043±0.006	82.5±12.1	11.4
I18507+0110	52.2±0.9	${5.9}_{- 0.2}^{+ 0.1}$ $\[5.9_{-0.2}^{+0.1}\]$	8.472±0.109	0.123±0.006	67.3±3.5	11.4
I19078+0901	39.4±2.8	${6.7}_{- 0.2}^{+ 0.2}$ $\[6.7_{-0.2}^{+0.2}\]$	8.199±0.404	0.154±0.008	52.0±3.8	11.4
I19078+0901	59.6±0.6	${6.0}_{- 0.1}^{+ 0.2}$ $\[6.0_{-0.1}^{+0.2}\]$	15.748±0.106	0.188±0.012	81.6±5.3	11.4
J1603-4904	-27.0±0.2	${6.7}_{- 0.2}^{+ 0.2}$ $\[6.7_{-0.2}^{+0.2}\]$	5.195±0.026	0.072±0.010	70.4±9.6	6.0
J1603-4904	2.8±0.1	${8.5}_{- 0.2}^{+ 0.2}$ $\[8.5_{-0.2}^{+0.2}\]$	3.352±0.043	0.036±0.007	91.6±16.9	6.0
J1720-3552	-181.4±1.6	${1.37}_{- 0.04}^{+ 0.04}$ $\[1.37_{-0.04}^{+0.04}\]$ ^a	0.927±0.005	<0.047^b	> 19	3.4
J1720-3552	-161.9±2.4	${1.37}_{- 0.04}^{+ 0.04}$ $\[1.37_{-0.04}^{+0.04}\]$ ^a	0.679±0.007	<0.021	> 31	3.4
J1720-3552	-140.9±1.0	${1.37}_{- 0.04}^{+ 0.04}$ $\[1.37_{-0.04}^{+0.04}\]$ ^a	1.426±0.007	0.037±0.006	37.5±6.5.5	3.4
J1720-3552	-104.6±1.3	${1.3}_{- 0.0}^{+ 0.0}$ $\[1.3_{-0.0}^{+0.0}\]$	6.219±0.056	0.144±0.005	42.2±1.7	3.4
J1720-3552	-31.7±0.1	${4.2}_{- 0.2}^{+ 0.2}$ $\[4.2_{-0.2}^{+0.2}\]$	10.925±0.019	0.227±0.011	46.8±2.3	3.4
J1720-3552	-22.0±0.2	${5.0}_{- 0.2}^{+ 0.2}$ $\[5.0_{-0.2}^{+0.2}\]$	2.321 ±0.018	0.178±0.004	12.7±0.3	3.4
J1720-3552	-7.9±0.0	${6.8}_{- 0.3}^{+ 0.3}$ $\[6.8_{-0.3}^{+0.3}\]$	34.042±0.124	0.784±0.012	42.3±0.7	3.4
J1720-3552	6.3±0.1	${6.9}_{- 0.1}^{+ 0.1}$ $\[6.9_{-0.1}^{+0.1}\]$	3.447±0.021	0.043±0.005	78.6±9.5	3.4
J1832-1035	7.1±0.2	${7.6}_{- 0.2}^{+ 0.2}$ $\[7.6_{-0.2}^{+0.2}\]$	6.393±0.136	0.045±0.013	139.4±41.9	3.7
J1832-1035	70.9±0.3	${4.3}_{- 0.1}^{+ 0.1}$ $\[4.3_{-0.1}^{+0.1}\]$	10.348±0.032	0.140±0.018	72.1±9.2	3.7
J1851+0035	14.5±0.2	${7.5}_{- 0.2}^{+ 0.2}$ $\[7.5_{-0.2}^{+0.2}\]$	9.555±0.077	0.093±0.021	99.6±22.7	5.5
J1851+0035	32.5±0.4	${6.6}_{- 0.2}^{+ 0.2}$ $\[6.6_{-0.2}^{+0.2}\]$	1.971 ±0.017	0.023±0.011	82.6±40.8	5.5
J1851+0035	55.6±1.1	${5.8}_{- 0.2}^{+ 0.2}$ $\[5.8_{-0.2}^{+0.2}\]$	11.614±0.162	0.136±0.019	83.4±11.8	5.5
J1922+1530	5.8±0.1	${8.0}_{- 0.2}^{+ 0.2}$ $\[8.0_{-0.2}^{+0.2}\]$	3.135±0.024	0.025±0.010	123.7±47.7	6.9
J1922+1530	40.9±1.1	${6.8}_{- 0.2}^{+ 0.2}$ $\[6.8_{-0.2}^{+0.2}\]$	8.187±0.156	0.116±0.009	68.8±5.3	6.9
J1922+1530	55.9±1.1	${6.3}_{- 0.1}^{+ 0.2}$ $\[6.3_{-0.1}^{+0.2}\]$	3.238±0.044	0.042±0.007	75.2±13.4	6.9

Notes.^(a) Estimation through tilted-disk model near the GC (see Sec. 3.2). ^(b) H¹³CO⁺ is contaminated with HCO, thus, it is an upper limit.

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