Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio

Details Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1310f&link_type=abstract

American Astronomical Society Meeting 206, #13.10; Bulletin of the American Astronomical Society, Vol. 37, p.791

Astronomy and Astrophysics

Astronomy

Scientific paper

We complement our HST observations of the inner ring of the galaxy NGC 3081 using an analytical approach and n-body simulations. We find that the inner ring forms under a rotating bar perturbation with very strong azimuthal cloud crowding where the ring crosses the bar major axis. Thus, star formation results "downstream" of the major axis. From the dust distribution and radial velocities, the disk turns counterclockwise on the sky, the same as the bar pattern speed. The inner ring at the bar major axis has an orbital rate equal to the pattern speed. From the ring shapes and spacing, the NGC 3081 bar strength(maximum tangential/radial force)appears to be constant from 7 through 14 kpc. We derive how the perturbation, the fractional long wavelength two-fold intensity and the rotation curve can be used to calculate that the NGC 3081 disk surface density at 7 kpc is 13 solar masses/square pc rising to 19 at 13 kpc. The latter is insufficient by a factor of seven to generate the rotation curve (halo domination). The surface density may have been reduced at 7 kpc due to inner ring gas cloud scattering. Surface density plus the observed surface brightness gives a disk M/L which increases from 7 kpc through 13 kpc. The ring lifetime of several Gyr in our simulations is consistent with our 400 Myr HST estimates. With a sufficiently low halo, our simulations form gas cloud "associations" near the ends of the bar as observed. Too low a halo results in a chaotic non-ring disk.
NASA/STScI GO grant 8707 to the University of Alabama and NSF Grant AST 020177 to Bevill State College in Fayette, Alabama

Affiliated with

Also associated with

No associations

Rating

Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inner Resonance Ring of NGC 3081 => Bar Strength => Disk Surface Mass Density and M/L Ratio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1300312