The JCMT Spectral Legacy Survey: physical structure of the molecular envelope of the high-mass protostar AFGL2591

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Table 1

Molecular lines with observed spatially extended emission.

Molecule

Transition

Frequency^a

ΔRA^b

ΔDec^b

Angular extent (Gaussian FWHM)^c

Position angle^d

(MHz)

(″)

Major axis (″)

Minor axis (″)

(degrees)

J = 3−2

345796.0

1.0 ± 0.2

4.7 ± 0.4

84.6 ± 1.6

53.9 ± 0.6

94.65 ± 0.02

¹³CO

J = 3−2

330588.0

2.7 ± 0.2

−1.4 ± 0.2

53.9 ± 0.6

46.6 ± 0.5

121.88 ± 0.05

C¹⁷O

J = 3−2

337061.2^e

−2.9 ± 0.2

−2.6 ± 0.2

42.4 ± 0.6

30.5 ± 0.4

78.05 ± 0.03

C₂H

N_J = 4_9/2 − 3_7/2

349338.3^f

−2.5 ± 0.2

−1.3 ± 0.1

30.7 ± 0.5

22.0 ± 0.3

105.91 ± 0.03

C₂H

N_J = 4_7/2 − 3_5/2

349340.0^g

−2.8 ± 0.2

−0.9 ± 0.1

29.1 ± 0.4

20.6 ± 0.3

108.54 ± 0.03

CH₃OH

J_K = 7₁ − 6₁ A⁺

335582.0

0.2 ± 0.4

−3.4 ± 0.4

23.8 ± 1.1

13.7 ± 0.6

135.41 ± 0.06

CH₃OH

J_K = 12₁ − 12₀ A^∓

336865.1

−1.7 ± 0.7

−1.7 ± 0.6

21.2 ± 1.8

13.1 ± 1.1

118.79 ± 0.12

CH₃OH

J_K = 7₀ − 6₀ E

338124.5

1.3 ± 0.3

−2.6 ± 0.3

21.5 ± 0.8

17.5 ± 0.7

34.25 ± 0.13

CH₃OH

J_K = 7_-1 − 6_-1 E

338344.6

3.2 ± 0.4

−2.2 ± 0.3

30.3 ± 1.0

20.6 ± 0.7

89.08 ± 0.06

CH₃OH

J_K = 7₀ − 6₀ A⁺

338408.7

4.7 ± 0.4

−2.3 ± 0.3

31.2 ± 0.9

23.0 ± 0.7

70.66 ± 0.07

CH₃OH

J_K = 7₂ − 6₂ E^h

338722.3^h

0.7 ± 0.3

−3.2 ± 0.3

19.6 ± 0.8

15.5 ± 0.6

114.61 ± 0.12

CH₃OH

J_K = 4₀ − 3_-1 E

350687.7

1.8 ± 0.3

−1.4 ± 0.3

34.6 ± 0.8

25.3 ± 0.6

72.59 ± 0.05

CH₃OH

J_K = 1₁ − 0₀ A⁺

350905.1

2.3 ± 0.3

−0.6 ± 0.3

33.1 ± 0.8

26.5 ± 0.6

75.68 ± 0.07

CH₃OH

J_K = 4₁ − 3₀ E

358605.8

1.0 ± 0.3

−2.1 ± 0.2

24.5 ± 0.8

15.9 ± 0.5

0.36 ± 0.05

CH₃OH

J_K = 7₂ − 6₁ E

363739.8

1.7 ± 0.3

−0.4 ± 0.3

19.0 ± 0.8

15.1 ± 0.6

143.75 ± 0.13

N_J = 3_7/2 − 2_5/2 ΔF=0

340263.7ⁱ

−1.3 ± 0.4

−5.4 ± 0.3

22.3 ± 1.1

17.3 ± 0.8

3.03 ± 0.13

N_J = 3_5/2 − 2_3/2 ΔF=1

340033.5^j

−1.4 ± 0.1

−4.8 ± 0.1

24.0 ± 0.3

19.4 ± 0.2

105.12 ± 0.04

N_J = 3_7/2 − 2_5/2 ΔF=1

340248.2^k

0.2 ± 0.2

−5.7 ± 0.1

27.5 ± 0.4

20.7 ± 0.3

93.23 ± 0.03

J = 7−6

342882.9

0.1 ± 0.1

1.3 ± 0.1

31.3 ± 0.4

21.1 ± 0.2

82.87 ± 0.02

C³⁴S

J = 7−6

337396.5

−4.0 ± 0.4

0.7 ± 0.3

20.9 ± 1.0

13.0 ± 0.6

117.48 ± 0.07

o-H₂CO

J_{K_a,K_c} = 5_1,5 − 4_1,4

351768.6

−0.8 ± 0.2

−2.7 ± 0.1

28.1 ± 0.4

19.9 ± 0.3

179.56 ± 0.03

p-H₂CO

J_{K_a,K_c} = 5_0,5 − 4_0,4

362736.0

−0.6 ± 0.2

−2.7 ± 0.1

22.8 ± 0.4

16.1 ± 0.3

169.49 ± 0.04

p-H₂CO

J_{K_a,K_c} = 5_2,3 − 4_2,2

365363.4

1.4 ± 0.2

−1.5 ± 0.2

21.1 ± 0.5

14.0 ± 0.3

20.99 ± 0.04

HCN

J = 4−3

354505.6^l

1.9 ± 0.1

−0.9 ± 0.1

26.5 ± 0.3

19.4 ± 0.3

95.18 ± 0.03

H¹³CN

J = 4−3

345339.7^m

2.4 ± 0.1

−3.3 ± 0.1

17.0 ± 0.2

14.0 ± 0.2

127.44 ± 0.05

HCO⁺

J = 4−3

356734.2

−1.2 ± 0.1

−1.5 ± 0.1

31.3 ± 0.3

22.2 ± 0.2

75.62 ± 0.02

H¹³CO⁺

J = 4−3

346998.3

0.6 ± 0.1

−0.8 ± 0.1

23.7 ± 0.3

18.2 ± 0.3

93.28 ± 0.04

HNC

J = 4−3

362630.3

−2.1 ± 0.1

−4.1 ± 0.1

25.8 ± 0.2

17.4 ± 0.1

75.90 ± 0.01

N₂H⁺

J = 4−3

372672.5

−3.4 ± 0.3

−3.1 ± 0.2

40.1 ± 0.9

17.7 ± 0.4

69.61 ± 0.02

SO₂

J_{K_a,K_c} = 23_3,21 − 23_2,22

336089.2

2.1 ± 0.4

−2.1 ± 0.5

18.8 ± 1.2

12.8 ± 0.8

55.95ⁿ ± 0.11

SO₂

J_{K_a,K_c} = 5_3,3 − 4_2,2

351257.2

−0.3 ± 0.1

−3.1 ± 0.1

18.0 ± 0.2

13.8 ± 0.2

141.41 ± 0.04

SO₂

J_{K_a,K_c} = 23_2,22 − 23_1,23

363925.8

0.8 ± 0.4

0.9 ± 0.5

21.4 ± 1.3

10.5 ± 0.6

58.52ⁿ ± 0.05

N_J = 7₈ − 6₇

340714.2

3.1 ± 0.1

−5.3 ± 0.1

17.8 ± 0.3

15.2 ± 0.3

118.64 ± 0.08

N_J = 8₈ − 7₇

344310.6

2.0 ± 0.1

−2.8 ± 0.1

18.7 ± 0.2

16.9 ± 0.2

152.92 ± 0.07

N_J = 9₈ − 8₇

346528.5

1.3 ± 0.1

−1.7 ± 0.1

22.0 ± 0.3

17.5 ± 0.2

109.09 ± 0.03

Continuum

850 μm

(N/A)

−1.2 ± 0.1

−1.0 ± 0.1

36.6 ± 0.2

27.4 ± 0.2

65.51 ± 0.01

Notes. Spatial extent determined from two-dimensional Gaussian fit to integrated intensity map of each transition. Uncertainties for peak position, major and minor axes, and position angle quoted here are formal fitting errors and do not include systematic errors due to pointing uncertainties.

^(a)

Laboratory frequency of line transition from CDMS (Müller et al. 2005).

^(b)

Offsets in right ascension (ΔRA) and declination (ΔDec) with respect to the reference position 20^h29^m249, 40°11′19″ (J2000).

^(c)

No beam deconvolution is applied before determining angular sizes.

^(d)

Position angle of the fitted major axis, expressed from north to east.

^(e)

Blend of fourteen hyperfine components (total separation 1.6 MHz).

^(f)

Blend of F = 5–4 and 4–3 hyperfine components (separation 1.3 MHz).

^(g)

Blend of F = 4–3 and 3–2 hyperfine components (separation 1.4 MHz).

^(h)

Blended with 7_-2 − 6_-2 transition (separation 1.3 MHz). The frequency listed in the table is the average.

⁽ⁱ⁾

Blended with OS¹⁸O. Listed frequency is the average for the OS¹⁸O 5_3,3–4_2,2 transition and the F = 5/2–5/2 and 7/2–7/2 hyperfine components of CN 3_7/2 − 2_5/2 (total separation 3.2 MHz).

^(j)

Blend of F = 7/2–5/2, 3/2–1/2 and 5/2–3/2 hyperfine components (total separation 4 MHz).

^(k)

Blend of F = 7/2–5/2, 9/2–7/2 and 5/2–3/2 hyperfine components (total separation 0.8 MHz).

^(l)

Blend of F = 4–4, 3–2, 4–3, 5–4, 3–4 and 3–3 hyperfine components (total separation 3.6 MHz).

^(m)

Blend of SO₂ 13_2,12 − 12_1,11 and hyperfine components F = 4–4, 3–2, 4–3, 5–4, 3–4 and F = 3–3 of H¹³CN 4–3 (total separation 3.6 MHz).

⁽ⁿ⁾

Position angle poorly represent actual morphology of the map (see Fig. 3).

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