Table 4
Line measurements for the stacking detection shown in Fig. 7, based on the red (v> −300 km s-1) velocities of both regions (excluding the M31-I (3) detection and M31-2c-a(1) tentative 13CO(2–1) detection).
| Pos. | V Stack | ⟨ V0 ⟩ (km s-1) | Δv (km s-1) | TPeak (mK) | Iline (K km s-1) | ||||
|
|
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| 13CO | C18O | 13CO | C18O | 13CO | C18O | 13CO | C18O | ||
| (2–1) | (2–1) | (2–1) | (2–1) | (2–1) | (2–1) | (2–1) | (2–1) | ||
|
|
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| Stack (red) | –144.2 | –212 | –212 | 50* | 50* | 1.65 | 0.95 | 0.088 ± 0.015 | 0.051 ± 0.015 |
| 31 | 0.15 ± 0.03 | ||||||||
| SE stack (red) | –226. | –218. | –218. | 39* | 39* | 2.26 | 1.28 | 0.094 ± 0.015 | 0.053 ± 0.015 |
| 39 | 0.14 ± 0.04 | ||||||||
|
|
|||||||||
| Pos. | V Stack | ⟨ V0 ⟩ (km s-1) | Δv (km s-1) | TPeak (mK) | Iline (K km s-1) | ||||
|
|
|||||||||
| HCO+ | HCN | HCO+ | HCN | HCO+ | HCN | HCO+ | HCN | ||
| (1–0) | (1–0) | (1–0) | (1–0) | (1–0) | (1–0) | (1–0) | (1–0) | ||
|
|
|||||||||
| SE Stack (blue) | –523 | − | –524.5 | 89∗ | 89 ± 25 | − | 1.17 | < 0.075 | 0.11 ± 0.03 |
| SE Stack (red) | –234 | –231 | –231 | 78 ± 29 | 78∗ | 0.74 | 0.85 | 0.061 ± 0.026 | 0.070 ± 0.024 |
Notes. We present the central velocities, velocity dispersions, peak temperatures, and integrated lines. ⟨ V0 ⟩ is the averaged velocity of the spectra used for each stacking. Similar stacking based on the 12CO(2–1) velocities is performed for HCN and HCO+ spectra of the south-east (SE) positions. As shown in Fig. A.2, redshifted (blueshifted) velocities are considered separately.
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