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Near-IR Imaging of Elliptical Galaxies

Pahre, M. A. and Djorgovski, S. and Matthews, K. and Shupe, D. and de Carvalho, R. and Mould, J. R. (1995) Near-IR Imaging of Elliptical Galaxies. In: Stellar Populations. International Astronomical Union Symposium (IAUS). No.164. Springer , Dordrecht, p. 443. ISBN 9780792335382.

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We have imaged more than thirty early-type galaxies in the K-band to investigate their stellar populations. Our surface brightness fluctuations (SBF) measurements for the nearest 14 galaxies produce a mean fluctuations magnitude in the K-band of M_K = −5.8 ± 0.2 mag. The scatter in the Virgo cluster is small at 0.18 mag, which implies that infrared SBF is potentially a good distance indicator (Pahre & Mould 1994). Inspection of the simple stellar population tracks of Worthey (1994) suggests that a plot of the fluctuation color (Ī— K) against broadband color (V — I) might be useful in discriminating between age and metallicity effects in elliptical galaxies. We have measured (r — K) color gradients for the entire sample utilizing three methods, two of them independent of sky-subtraction errors, as found in Sparks & Jørgensen (1993). Our color gradients are consistent with a mean metallicity gradient of 0.14 mag dex^(-1), which is somewhat smaller than that implied by optical color and line gradients alone, suggesting that age gradients may also be important. Finally, we have constructed an infrared Fundamental Plane (FP) which is consistent with its optical counterpart; continued work will determine if there is a significant change in the tilt of the FP between the optical and infrared.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Djorgovski, S.0000-0002-0603-3087
Shupe, D.0000-0003-4401-0430
de Carvalho, R.0000-0002-1283-3363
Mould, J. R.0000-0003-3820-1740
Additional Information:© Springer Science+Business Media Dordrecht 1995. MAP acknowledges a AAS travel grant for this meeting, and SGD acknowledges NSF PYI award AST-9157412.
Funding AgencyGrant Number
American Astronomical SocietyUNSPECIFIED
Series Name:International Astronomical Union Symposium (IAUS)
Issue or Number:164
Record Number:CaltechAUTHORS:20190530-103644055
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95958
Deposited By: George Porter
Deposited On:30 May 2019 18:08
Last Modified:16 Nov 2021 17:17

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