Best-fit parameters for our two-armed spiral emission model with different assumptions about the input parameters.
|Input parameters||Fitted parameters|
|Bar angle||Pitch angle||Bar radius||Pitch angle||26Al drop-off||26Al vel.||χ 2|
|α||i||r0 [kpc]||i||a||vbo [km s-1]|
|38°||4.4||7.7°||0.35||220 ± 60||1.63|
|38°||5.56°||4.6||0.40||225 ± 50||1.79|
|20°||5.56°||4.9||0.65||240 ± 60||2.00|
|38°||4.1||–0.19° / 10.25°||0.01||180 ± 75||1.01|
Notes. We have adopted the model with fixed α = 38° and i = 5.56°. The rightmost column shows reduced χ2 as a measure of fit quality. We also include our best-fit four-arm spiral in the bottom row.
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