Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1610m&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1610-1618
Astronomy and Astrophysics
Astronomy
23
Galactic Bulge, Galactic Evolution, Galactic Structure, Gas Dynamics, Interstellar Gas, Ionized Gases, Planetary Nebulae, Stellar Evolution, Stellar Luminosity, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Spectroscopy, Fabry-Perot Spectrometers, H Alpha Line, Ultraviolet Spectroscopy
Scientific paper
We present the results of an investigation into the morphology and dynamics of ionized gas in the bulge of the gas-rich S0 galaxy NGC 5102. We show that the bulge of NGC 5102 contains a ring of ionized gas, approximately 1.3 kpc in diameter, which is centered well away from the nucleus. Through spectroscopy and (O III) lambda-5007 imaging, we show that the gas is excited by a low-velocity shock, which varies from approximately 50 to approximately 70 km/s along the ring. Fabry-Perot images in H-alpha confirm that the gas is moving slowly, and suggest that the structure is a supershell, approximately 107 yr old. This age is significantly younger than the galaxy's nuclear starburst, which is approximately 2 x 108 yr old. We also use our (O III) lambda-5007 images to identify planetary nebulae (PNs) in the bulge and inner disk of NGC 5102. Using the planetary nebula luminosity function, we derive a distance modulus to the galaxy of (m - M)0 = 27.47+0.18-0.27, or 3.1+0.3-0.4 Mpc, confirming its membership in the NGC 5128 group. Our derived value of 47.2+12.2-9.2 x 10-9 for the bolometric luminosity-specific PN density, alpha2.5, is higher than that observed for the bulge of M31 or the giant ellipticals of the Virgo Cluster, but not significantly different from that found for the small, normal ellipticals NGC 3377 or M32. The high value for alpha2.5 suggests that virtually all of NGC 5102's stars will someday evolve through the planetary nebula stage.
Ciardullo Robin
Jacoby George H.
McMillan Russet
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