Table 1.
Global properties of IC 342.
| Property | Value | Reference |
|---|---|---|
| Hubble type | SABcd | NED/LEDA |
| Distance | 3.45 ± 0.13 Mpc | Anand et al. (2021) |
| Scale | 1″ ∼ 16.7 pc | For above distance |
| Center RA | 03h 46m 48.50s | NED |
| Center Dec | +68 ° 05′ 46.9″ | NED |
| Systemic Vel. | 30 ± 2 km s−1 | Meidt et al. (2009) |
| Systemic Vel. | 32 ± 2 km s−1 | this work |
| Inclination | 31 ± 5deg | Meidt et al. (2009) |
| Position angle | 42 ± 3deg | Meidt et al. (2009) |
| R25 | 9.98′±0.46′ | LEDA |
| Effective radius | 4.28′≈4.3 kpc | This work for above distance |
| E(B − V)foreground | 0.494 mag | Schlafly & Finkbeiner (2011) |
| E(B − V)internal | 0.507 mag | This work |
| 12 + log(O/H)R0 | 8.83 ± 0.04 dex | Pilyugin et al. (2014) |
| Δlog(O/H)/Rgal(a) | −0.513 ± 0.087 dex/R25 | Pilyugin et al. (2014) |
| Mstar | 1.8 × 1010 M⊙ | This work |
| Matom | 8.5 × 109 M⊙ | Crosthwaite et al. (2000) |
| Mmol(b) | (4.2 ± 0.8)×109 M⊙ | This work |
| Mdust | (4.5 ± 0.9)×107 M⊙ | Aniano et al. (2020) |
| SFR(22 μm) or SFR(TIR) | 1.75 ± 0.25 M⊙ yr−1 | This work/Sanders et al. (2003) |
Notes. Morphological Hubble type, distance, and kinematic orientation parameters of IC 342 according to the reference provided, the NASA/IPAC Extragalactic Database (NED; https://ned.ipac.caltech.edu), or LEDA (https://leda.univ-lyon1.fr). R25 is the 25 mag arcsec−2B-band isophotal radius, while the effective radius contains half of the light. E(B − V) represents optical extinction, 12 + log(O/H)R0 is the gas-phase metallicity, and Δlog(O/H)/Rgal is the metallicity radial gradient (where Rgal is galactocentric radius). Mstar, Matom, Mmol, and Mdust represent the total stellar, atomic, molecular, and dust mass in this galaxy. SFR is the total star formation rate. All masses were scaled to our adopted distance.
Oxygen abundance gradient constrained by only five H II regions (McCall et al. 1985).
We estimated the molecular gas mass using our short-spacing-corrected NOEMA data (total CO luminosity multiplied by the Galactic αCO). Since the NOEMA field of view is limited, we extrapolated to the whole galaxy according to the proportion of the total WISE 22 μm luminosity that falls within the NOEMA field of view; as WISE 22 μm is a SFR tracer, it should roughly scale according to the molecular mass at each radius.
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