Hunting pre-stellar cores with APEX: Corona Australis 151, the densest pre-stellar core or the youngest protostar?

Open Access

Table D.1

Lines robustly detected (S/N > 3) in the spectral ranges covered by the observations.

Species	Transition	Rest frequency^a	W	V_lsr	FWHM
		MHz	K km/s	km/s	km/s
CN^b	$N J = 2 \frac{3}{2} - 1 \frac{3}{2}$ $N\ J=2 \frac{3}{2}-1 \frac{3}{2}$	226333.0904	1.004(4)	5.56691(3)	0.391(4)
CH₃OH^c	J_{K_a K_c} = 5₀₅ − 404 (A)	241791.3520	0.152(5)	5.491(7)	0.44(2)
	J_{K_aK_c}=5₁₅ − 4₁₄ (E)	241767.2340	0.133(6)	5.499(9)	0.46(3)
	J_{K_a K_c} = 5₀₅ − 4₀₄ (E)	241700.1590	0.024(17)	5.6(3)	1.3(1.6)
CH₃OH^c	J_{K_{a K_c}}=6₀₆ − 5₀₅ (A)	290110.637	0.019(3)	5.475(14)	0.17 (3)
	J_{K_{a K_c}} = 6₁₆ − 5₁₅ (E)	290069.7470	0.042(8)	5.56(5)	0.7(2)
CH₃OH	J_{K_{a K_c}} = 2₁₁ − 2₀₂ (A)	304208.348	0.098(8)	5.501(17)	0.46 (5)
CH₃OH	J_{K_{a K_c}} = 3₁₂ − 3₀₃ (A)	305473.491	0.074(10)	5.49(3)	0.53 (11)
CH₃OH	J_{K_{a K_c}} = 3₁₂ − 3₂₀₂ (E)	310192.994	0.050(8)	5.52(3)	0.35(7)
CHD₂OH	J_{K_{a K_c}} = 1₁₂ − 1₀₁(e₀ − o₀)	241353.127	0.012(2)	5.58(5)	0.56(9)
H₂CO	J_{K_{a K_c}} = 3₁₂ − 2₁₁	225697.7750	0.975(5)	5.4819(14)	0.552(3)
H₂CO	J_{K_{a K_c}} = 4₀₄ − 3₀₃	290623.405	0.340(11)	5.585(9)	0.66 (3)
HDCO	J_{K_{a K_c}} = 1₁₁ − 0₀₀	227668.453	0.017(3)	5.55(5)	0.54(14)
HDCO	J_{K_{a K_c}}=4₁₄ − 3₁₃	246924.600	0.0709(18)	5.496 (6)	0.519(16)
D₂CO	J_{K_{a K_c}} = 4₀₄ − 3₀₃	231410.234	0.087(2)	5.608(7)	0.485(17)
D₂CO	J_{K_{a K_c}} = 4₁₃ − 3₁₂	245532.752	0.0228(16)	5.62(2)	0.56(4)
H₃CO⁺	J_{K_{a K_c}} = 1₁₁ − 0₀₀	226746.308	0.0134(2)	5.68(4)	0.56(9)
c − C₃H₂	J_{K_{a K_c}} = 4₃₂ − 3₂₁	227169.1378	0.0879(19)	5.549(4)	0.331(10)
c − C₃H₂	J_{K_{a K_c}} = 3₂₁ − 2₁₂	244222.1505	0.159(2)	5.53(2)	0.321(5)
C¹⁷O^d	J = 2 − 1	224714.385	-	-	-
HNC	J = 3 − 2	271981.1420	1.39(4)	5.548(5)	0.450(15)
DCN	J = 4 − 3	289644.9170	0.101(6)	5.63(2)	0.71(5)
DNC	J = 3 − 2	228910.481	1.177(2)	5.5936(5)	0.5584(13)
DNC	J = 4 − 3	305206.219	0.372(9)	5.593(7)	0.596(16)
DCO⁺	J = 4 − 3	288143.3858	0.784(7)	5.594(3)	0.543(6)
CS	J = 5 − 4	244935.5565	0.546(9)	5.559(3)	0.449(10)
CS	J = 6 − 5	293912.0865	0.430(8)	5.696(10)	0.93(2)
C³⁴S	J = 5 − 4	241016.0892	0.033(2)	5.563(19)	0.55(5)
SO	N J = 32 − 23	246404.5881	0.0203(18)	5.559(10)	0.29(4)
SO	N J = 78 − 67	304077.844	0.150(11)	5.71(3)	0.93(9)
SO	N J =22 − 12	309502.444	0.219(10)	5.537(6)	0.296(17)
SO₂	J_{K_{a K_c}} = 5₂₄ − 4₁₃	241615.7967	0.062(2)	5.505(5)	0.306 (14)
HDS	J_{K_{a K_c}} = 1₀₁ − 0₀₀	244555.580	0.099(2)	5.666(3)	0.352(9)
ND₃^e	J_K = 1₀ − 0₀	309909.490	0.78(10)	5.748(9)	0.53(2)
HDO	J_{K_{a K_c}}=1₀₁ − 0₀₀	464924.520	0.129(6)	5.493(10)	0.42(2)

Notes. For each line, the species, the type of transition, and the rest frequency (taken from the CDMS and JPL catalogues, Müller et al. 2005; Pickett et al. 1998) are given. The last three columns report parameters obtained from the Gaussian fit performed in CLASS. Uncertainties on the last digit(-s) are written in brackets.

^(a)Rest frequencies are derived from the laboratory work in Bocquet et al. (1999); Bechtel et al. (2006); Clark & De Lucia (1976); Helminger & Gordy (1969); Messer et al. (1984); Cazzoli et al. (2002); Klapper et al. (2003); Dixon & Woods (1977); Caselli & Dore (2005); Helminger et al. (1971); Brünken et al. (2006); Saykally et al. (1976); Melosso et al. (2021); Zakharenko et al. (2015); Müller & Lewen (2017); Xu et al. (2008); Bogey et al. (1986).

^(b)We report the CLASS HFS fit results for the $N J = 2 \frac{3}{2} - 1 \frac{3}{2}$ $N\ J=2 \frac{3}{2}-1 \frac{3}{2}$ transition. The first best-fit parameter is the Σ T_ant × τ quantity.

^(c)The transitions are shown in a single panel in Fig. 5.

^(d)The hyperfine structure is barely resolved and the Gaussian fit is not performed.

^(e) The entire J_K = 1₀ − 0₀ is fit via the HFS fit of CLASS. The first best-fit parameter is the Σ T_ant × τ quantity.

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.