Computer Science – Numerical Analysis
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280...33s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 1, p. 33-56
Computer Science
Numerical Analysis
9
Astronomical Models, Distribution Functions, Galactic Bulge, Galactic Evolution, Galactic Structure, Kinematics, Numerical Analysis, Spiral Galaxies, Stellar Motions, Absorption Spectroscopy, Astronomical Photometry, Astronomical Spectroscopy, Charge Coupled Devices, Mathematical Models
Scientific paper
This paper presents detailed multi-color CCD photometry and absorption-line spectroscopy of the edgeon Sa/Sab galaxy NGC 1055. The box/peanut isophotal distortions within the bulge component are spatially extensive, extending to 8.3 kpc in galactocentric distance and 9.7 kpc in Z-height at an estimated surface brightness of 26-26.5 (B) mag/sq arcsec. The bulge displays a constant circular velocity to the limiting Z-heights in the spectra (2.1 and 4.1 kpc along positions aligned perpendicular to the major axis). The high degree of ordered motion inferred from this 'cylindrical rotation' velocity field also concurs with the highly centrally concentrated velocity dispersion distribution. The derived kinematic profiles show evidence for 'cylindrical rotation' even in those regions of the observed luminosity distribution in which the bulge appears neither boxy nor peanut-shaped. These data are modeled using a self-consistent numerical scheme which utilities a distribution function dependent upon the two classical integrals of the motion (total stellar energy and the component of angular momentum about the rotation axis). The optimum solutions thus determined are found to provide a good description of the box/peanut bulge in NGC 1055, confirming previous conclusions that the distribution functions for such bulges do not require the presence of a third integral of the motion nor a significant degree of triaxiality. The general conclusions derived from numerical modeling of the Sab NGC 1055 and the Sbc NGC 3079 (Shaw et al. 1993) are equivalent despite the grossly dissimilar structural scale of the box/peanut bulges in these systems.
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