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Hubble Space Telescope Planetary Camera Images of NGC 1316 | | Edward J. Shaya
; Daniel M. Dowling
; Douglas G. Currie
; S.M. Faber
; Edward A. Ajhar
; Tod R. Lauer
; Edward J. Groth
; Carl J. Grillmair
; C. Roger Lynds
; Earl J. O’Neil, Jr
; | | Date: |
13 Mar 1996 | | Abstract: | We present HST Planetary Camera V and I~band images of the central region of the peculiar giant elliptical galaxy NGC~1316. The inner profile is well fit by a nonisothermal core model with a core radius of 0.41" +/- 0.02" (34 pc). At an assumed distance of 16.9 Mpc, the deprojected luminosity density reaches $sim 2.0 imes 10^3 L_{sun}$ pc$^{-3}$.
Outside the inner two or three arcseconds, a constant mass-to-light ratio of $sim 2.2 pm 0.2$ is found to fit the observed line width measurements. The line width measurements of the center indicate the existence of either a central dark object of mass $2 imes 10^9 M_{sun}$, an increase in the stellar mass-to-light ratio by at least a factor of two for the inner few arcseconds, or perhaps increasing radial orbit anisotropy towards the center. The mass-to-light ratio run in the center of NGC~1316 resembles that of many other giant ellipticals, some of which are known from other evidence to harbor central massive dark objects (MDO’s).
We also examine twenty globular clusters associated with NGC~1316 and report their brightnesses, colors, and limits on tidal radii. The brightest cluster has a luminosity of $9.9 imes 10^6 L_{sun}$ ($M_V = -12.7$), and the faintest detectable cluster has a luminosity of $2.4 imes 10^5 L_{sun}$ ($M_V = -8.6$). The globular clusters are just barely resolved, but their core radii are too small to be measured. The tidal radii in this region appear to be $le$ 35~pc. Although this galaxy seems to have undergone a substantial merger in the recent past, young globular clusters are not detected. | | Source: | arXiv, astro-ph/9603056 | | Services: | Forum | Review | PDF | Favorites | |
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