The observed chemical structure of L1544 | Astronomy & Astrophysics (A&A)

Free Access

Table 1

Spectroscopic parameters of the observed lines, divided depending on the position of their emission peaks.

Molecule	Transition	Rest frequency		E _up		A		rms^a
		(MHz)		(K)		(×10^-5 s^-1)		(mK)

c-C₃H₂ peak
c-¹³C₃H₂^*	J_{K_a,K_c} = 2_1,2–1_0,1	84 185	634	6	30	2	17	6
c-C₃H₂^*	J_{K_a,K_c} = 3_2,2–3_1,3	84 727	688	16	10	1	04	21
c-C₃H₂	J_{K_a,K_c} = 2_0,2–1_1,1	82 093	544	6	40	1	89	17
H₂CCC	J_{K_a,K_c} = 5_1,5–4_1,4	102 992	379	28	19	9	32	16
H₂CCC^*	J_{K_a,K_c} = 4_1,3–3_1,2	83 933	699	23	43	4	82	13
C₃H^* (Λ = b^b)	J = 9/2–7/2 F = 5–4	97 995	166	12	54	6	12	7
C₃H (Λ = b^b)	J = 9/2–7/2 F = 4–3	97 995	913	12	54	5	95	7
C₄H^*	N = 12–11 J = 25/2–23/2 F = 12–11 & 13–12	114 182	510	35	62	0	63	10
H₂CCO^*	J_{K_a,K_c} = 5_1,5–4_1,4	100 094	514	27	46	1	03	7
H₂CCO	J_{K_a,K_c} = 5_1,4–4_1,3	101 981	429	27	73	1	09	18
HCCNC^*	J = 9–8	89 419	300	21	46	3	38	16
H₂CS^*	J_{K_a,K_c} = 3_0,3–2_0,2	103 040	452	9	89	1	48	16
HCS⁺^*	J = 2–1	85 347	890	6	14	0	11	15
C³⁴S^*	J = 2–1	96 412	949	6	94	1	60	32
CCS	N,J = 8, 7–7, 6	99 866	521	28	14	4	40	11
CCS	N,J = 7, 6–6, 5	86 181	391	23	34	2	78	14
CCS	N,J = 7, 7–6, 6	90 686	381	26	12	3	29	15
CCS^*	N,J = 8, 9–7, 8	106 347	726	25	00	5	48	16
CH₃CN^*	J_K = 6₀–5₀	110 383	500	18	54	11	11	17
HCC¹³CN^*	J = 10–9	90 601	777	23	92	5	74	10

Dust peak
¹³CN^*	N = 1–0 F₁ = 2–1 F₂ = 2–1 F = 3–2	108 780	201	5	25	1	05	4
H¹³CN^*	J = 1–0 F = 2–1	86 340	168	4	14	2	25	20
N₂H⁺^*	J = 1–0 F₁ = 0–1 F = 1–2	93 176	265	4	47	2	01	20

Methanol peak
CH₃OH^*	J_{K_a,K_c} = 2_1,2–1_1,1 (E₂)	96 739	362	12	53^c	0	26	37
CH₃OH	J_{K_a,K_c} = 0_0,0–1_1,1 (E₁-E₂)	108 893	963	13	12^c	1	47	9
SO^*	N,J = 2, 2–1, 1	86 093	950	19	31	0	52	27
SO	N,J = 3, 2–2, 1	109 252	220	21	05	1	08	23
³⁴SO^*	N,J = 2, 3–1, 2	97 715	317	9	09	1	07	10
SO₂^*	J_{K_a,K_c} = 3_1,3–2_0,2	104 029	418	7	74	1	01	18
OCS^*	J = 7–6	85 139	103	16	34	0	17	14
HCO^*	N_{K_a,K_c} = 1_0,1–0_0,0J = 3/2–1/2 F = 2–1	86 670	760	4	18	0	47	14

HNCO peak
CH₂DCCH^*	J_{K_a,K_c} = 6_0,6–5_0,5	97 080	728	16	31	0	30	7
CH₃CCD^*	J_K = 6₁–5₁	93 454	331	22	92	0	26	7
CH₃CCH^*	J_K = 5₀–4₀	102 546	024	17	30	0	20	32
CH₃CCH	J_K = 6₁–5₁	85 457	300	24	45	0	35	20
HNCO^*	J_{K_a,K_c} = 4_0,4–3_0,3	87 925	237	10	55	0	88	20
HNCO	J_{K_a,K_c} = 5_0,5–4_0,4	109 905	749	15	82	1	75	6

Other
¹³CS^*	J = 2–1	92 494	308	6	66	1	41	18
HC¹⁸O⁺^*	J = 1–0	85 162	223	4	09	3	64	15

Notes.

^(*)

Molecular transitions included in the principal component analysis;

^(a)

average rms of the map;

^(b)

a transition between lambda doublets of lower energy is designated as an a component and between upper doublets as a b component (Brown et al. 1975);

^(c)

energy relative to the ground 0_0,0, A rotational state.

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.