Confirm whether the inner 13CO velocity-dispersion increase is real

Establish whether the observed increase in ¹³CO (3–2) velocity dispersion from approximately 0.05 km s⁻¹ at 1 arcsec from IRAM 04191+1522 to approximately 0.30 km s⁻¹ at the source position is a genuine physical effect rather than an artifact of insufficient spectral resolution.

Background

The ¹³CO (3–2) velocity-dispersion map shows an apparent increase in dispersion toward the central source. However, the reported change is comparable to the 0.22 km s⁻¹ spectral resolution of the ¹³CO data cube.

Because the signal is close to the instrumental resolution, the authors explicitly leave unresolved whether the apparent increase reflects real gas kinematics or an observational artifact. Higher spectral-resolution observations are required to distinguish these possibilities.

References

Further observations are needed to confirm if this observed increase is real or an effect due to insufficient spectral resolution.

— Complex morphology and kinematics at the heart of the very low luminosity object IRAM 04191+1522  (2608.17593 - Otten et al., 18 Aug 2026) in Section 3.2, subsection “¹³CO (3–2) Kinematics”