SIMBAD references

We report Very Large Array B-configuration observations of the atomic hydrogen 21 cm line emission from the barred disk galaxy NGC 5597 at an angular resolution of ∼ 7.″1 × 4.″2. Using the resonance method, and assuming the ratio of the corotation radius to the semimajor axis of the stellar bar is unity (${ \mathcal R }\equiv {R}_{\mathrm{CR}}/{a}_{\mathrm{bar}}=1$), we estimate the angular pattern speed of the stellar bar to be, Ω_bar ∼ 15.3 km s^–1 kpc^–1. This constant value for Ω_bar crosses Ω_gas + κ(R)/4 at a distance ∼6.73 kpc, which would correspond to the spatial location of the north spiral structure near an outer m = 4 resonance. This value of Ω_bar is similar to the values estimated for other bright nearby barred galaxies that exhibit circumnuclear rings (near inner Lindblad resonance) or outer rings (near outer Lindblad resonance).