An optical and H I study of NGC 5850 - Victim of a high-speed encounter?

Details An optical and H I study of NGC 5850 - Victim of a high-speed encounter? An optical and H I study of NGC 5850 - Victim of a high-speed encounter?

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115...80h&link_type=abstract

Astronomical Journal, vol. 115, p. 80

Mathematics

Logic

23

Spiral Galaxies, Galactic Structure, Charge Coupled Devices, Astronomical Photometry, Broadband, Morphology

Scientific paper

We present optical CCD surface photometry and VLA H I observations of NGC 5850, one of the largest and brightest barred spirals of the inner ring variety in the sky. The broadband images reveal numerous morphological peculiarities, particularly in the spiral arms. Structural asymmetries are more obvious in H I, the most pronounced being a large-scale displacement of gas to the west and northwest of the nucleus. Most of the atomic hydrogen is concentrated in the prominent optical ring and faint spiral arms, with very low H I surface densities in the bulge and interarm regions. The H I surface density drops rapidly outside the arms, and we find no evidence for either large-scale tidal features or an extended gas disk above 0.05 M(solar)/sq pc. Overall, the intensity-weighted H I velocity field appears fairly regular, yet still shows clear deviations from circular rotation that we attribute to a warped oval disk and streaming motions across the arms. Radio continuum emission at 20 cm is dominated by a faint bulge component that peaks at the optical nucleus. The spiral arms are not detected. The absence of extended X-ray emission throughout the NGC 5846 group and the close similarity between NGC 5850's optical and H I morphologies argue against ram pressure stripping through a dense intergalactic medium as the cause of the galaxy's peculiar morphology. We attribute it instead to a high-speed encounter with the massive elliptical galaxy NGC 5846.

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