Table 1.
Methanol line parameters.
| Source | αJ2000 | δJ2000 | Transition | ν | ∫SdV | VLSR | ΔV1/2 | Speak | LCH3OH |
|---|---|---|---|---|---|---|---|---|---|
| (GHz) | (mJy km s−1) | (km s−1) | (km s−1) | (mJy) | (L⊙) | ||||
| Maffei 2 | 02:41:55.2 | +59:36:12 | 4−1 → 30 | 36.169261 | 422 ± 45 | –99.3 ± 1.9 | 35.0 ± 3.9 | 11.3 ± 1.9 | 0.53 ± 0.06 |
| 4−1 → 30 | 36.169261 | 1181 ± 60 | 7.5 ± 1.5 | 61.1 ± 3.4 | 18.1 ± 1.5 | 1.47 ± 0.07 | |||
| 70 → 61 | 44.069419 | < 12.0 | |||||||
| IC 342 | 03:46:48.6 | +68:05:46 | 4−1 → 30 | 36.169261 | 641 ± 64 | 29.7 ± 3.6 | 70.6 ± 8.0 | 8.5 ± 1.4 | 0.26 ± 0.03 |
| 70 → 61 | 44.069419 | < 10.0 | |||||||
| M 82 | 09:55:52.2 | +69:40:47 | 4−1 → 30 | 36.169261 | < 4.4 | ||||
| NGC 4388 | 12:25:46.7 | +12:39:41 | 4−1 → 30 | 36.169261 | < 4.6 | ||||
| NGC 5728 | 14:42:23.9 | –17:15:11 | 4−1 → 30 | 36.169261 | < 4.5 | ||||
| Arp 220 | 15:34:57.3 | +23:30:11 | 4−1 → 30 | 36.169261 | < 4.2 |
Notes. Obtained from Gaussian fits to the average spectra displayed in Fig. 2. Column 1: sources; Cols. 2 and 3: J2000 coordinates; Col. 4: methanol transition; Col. 5: rest frequency; Cols. 6–8: integrated flux densities, local standard of rest velocities, and full width at half power line widths. Given errors include standard deviations from Gaussian fits but do not include the calibration uncertainty (Sect. 2.2); Col. 9: peak flux densities; Col. 10: methanol line luminosities. Adopted distances: 5.73 Mpc for Maffei 2 and 3.28 Mpc for IC 342 (see Sect. 4). For M 82, NGC 4388, NGC 5728, and Arp 220, 1σ upper limits are given for 9.7 km s−1 wide channels. For the 44 GHz transition towards Maffei 2 and IC 342, 1σ upper limits are given for 8.0 km s−1 wide channels. To convert the local standard of rest velocities given here into heliocentric values, use VHEL = VLSR − 3.1 km s−1 for Maffei 2 and VHEL = VLSR − 3.9 km s−1 for IC 342.
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