Starbursts in barred spiral galaxies. VI. HI observations and the K-band Tully-Fisher relation

TL;DR

This study examines how bars affect HI content in starburst and Seyfert galaxies and assesses their adherence to the Tully-Fisher relation, revealing that bars funnel HI inward and that some galaxies deviate due to ongoing formation processes.

Contribution

It provides new insights into the impact of bars on HI distribution and the deviations of starburst galaxies from the Tully-Fisher relation compared to normal galaxies.

Findings

Barred galaxies have lower HI masses than unbarred galaxies.

Starburst galaxies show significant deviations from the Tully-Fisher relation.

Some galaxies are still forming, with external HI gas not yet stabilized.

Abstract

This paper is primarily a study of the effect of a bar on the neutral hydrogen (HI) content of starburst and Seyfert galaxies. We also make comparisons with a sample of ``normal'' galaxies and investigate how well starburst and Seyfert galaxies follow the fundamental scaling Tully-Fisher (TF) relation defined for normal galaxies. 111 Markarian (Mrk) IRAS galaxies were observed at the Nancay radiotelescope. These measurements are complemented by data from the literature to form a sample of 105 unbarred and 113 barred Mrk IRAS galaxies. Barred galaxies have lower total and bias-corrected HI masses than unbarred galaxies, and this is true for both Mrk IRAS and normal galaxies. This robust result suggests that bars funnel the HI gas toward the center of the galaxy where it becomes molecular before forming new stars. The Mrk IRAS galaxies have higher bias-corrected HI masses than normal galaxies. They also show significant departures from the TF relation, both in the B and K bands. The most deviant points from the TF relation tend to have a strong far-infrared luminosity and a low oxygen abundance. These results suggest that a fraction of our Mrk IRAS galaxies are still in the process of formation, and that their neutral HI gas, partly of external origin, has not yet reached a stationary state.