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Home All issues Volume 629 (September 2019) A&A, 629 (2019) A72 Full HTML

Table 8.

Parameters of our best-fit LTE model of acetone and its 13C isotopologs toward Sgr B2(N2).

Molecule Status (a) Ndet(b) Size (c) Trot(d) N(e) Fvib(f) ΔV(g) Voff(h) (i)
(″) (K) (cm−2) (km s−1) (km s−1)
CH3C(O)CH3, v = 0⋆ d 122 1.2 140 4.0 (17) 1.00 5.0 0.0 1
v12 = 1 d 33 1.2 140 4.0 (17) 1.00 5.0 0.0 1
v17 = 1 d 13 1.2 140 4.0 (17) 1.00 5.0 0.0 1
13CH3C(O)CH3, v = 0 t 1 1.2 140 3.0 (16) 1.00 5.0 0.0 13
CH3 13C(O)CH3, v = 0 n 0 1.2 140 < 1.5 (16) 1.00 5.0 0.0 > 27

Notes.

(a)

d: detection, t: tentative detection, n: nondetection.

(b)

Number of detected lines (conservative estimate, see Sect. 3 of Belloche et al. 2016). One line of a given species may mean a group of transitions of that species that are blended together.

(c)

Source diameter (FWHM).

(d)

Rotational temperature.

(e)

Total column density of the molecule. X (Y) means X × 10Y. An identical value for all listed vibrational states of a molecule means that LTE is an adequate description of the vibrational excitation.

(f)

Correction factor that was applied to the column density to account for the contribution of vibrationally excited states, in the cases where this contribution was not included in the partition function of the spectroscopic predictions.

(g)

Linewidth (FWHM).

(h)

Velocity offset with respect to the assumed systemic velocity of Sgr B2(N2), Vsys = 74 km s−1.

(i)

Column density ratio, with Nref the column density of the previous reference species marked with a ⋆.

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