Table 1.
Properties of NGC 6946.
| Parameter | Value | Notes |
|---|---|---|
| Morphology | SAB(rs)cd | (1) |
| Nuclear type | Star-forming, H II | (2) |
| Age of starburst | 7 − 20 Myr | (3) |
| Distance | 7.72 Mpc | (4) |
| Linear scale | 37 pc/arcsec | |
| Inclination | 33° | (5) |
| PA major axis | 242° | (6) |
| PA minor axis | 152° | (6) |
| VLSR | 50 km s−1 | (7) |
| Dynamical centre | (7) | |
| RA (J2000) | 20 : 34 : 52.35 | |
| Dec (J2000) | +60 : 09 : 14.58 | |
| Inner bar | ||
| Length | 6.5 − 8″ | (7) |
| NBE, RA | 20 : 34 : 51.71 | This work |
| NBE, Dec | +60 : 09 : 17.21 | This work |
| SBE, RA | 20 : 34 : 52.67 | This work |
| SBE, Dec | +60 : 09 : 11.53 | This work |
Notes. (1) de Vaucouleurs et al. (1991); (2) Goulding & Alexander (2009); (3) Engelbracht et al. (1996); (4) Anand et al. (2018); they applied the tip of the red giant branch method to measure the distance to NGC 6946. The brightest red giant stars in the outer regions of NGC 6946 were adopted as standard candles. Research on NGC 6946 carried out before 2018 used smaller values for its distance, ranging from 5 Mpc (e.g. Schinnerer et al. 2006) to about 7 Mpc (e.g. Murphy et al. 2011). Where necessary, we convert measurements from the literature to our adopted distance. (5) de Blok et al. (2008); (6) Crosthwaite (2002); (7) Schinnerer et al. (2006).
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