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Date and Time of the Query: 2019-08-22 T12:20:27 PDT
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For refcode 1991A&A...249..312R:
Retrieve 124 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1991A&A...249..312R The manifold of early-type galaxies from IR photometry in clusters of galaxies. The Virgo cluster E. Recillas-Cruz, L. Carrasco, A. Serrano P.G., and I. Cruz-Gonzalez Instituto de Astronomia, UNAM, Apartado Postal 70-264, C.U., Mexico, D.F. CP 04510 Observatorio Astronomico Nacional, UNAM, P.O. Box 439027, San Ysidro, CA 92143-9027, USA Received September 17, accepted December 18, 1990 Abstract. In the present paper 124 galaxies of all morphological types members of the Virgo cluster are studied via accurate near infrared JHK photometry. Apparent fixed aperture magnitudes and colors, corrected for galactic extinction and redshift, for a sample of early-type galaxies are used to construct color-color (J - H) vs. (H - K) diagrams. Color- magnitude (J - H), (H - K), (J - K) and (V - K) versus K_T_ diagrams are established for the galaxies with measured diameters in our sample. The (J - K) and (V- K) versus K_T_ diagrams show a color-luminosity relationship. From published velocity dispersion data and the IR luminosities for 26 early-type galaxies the L -{sigma} and L-{sigma}-1 relationships are investigated for IR wavelengths and compared with similar relationships in other bands. Our results are the following: (i) As previously found for the early-type galaxies in the Coma cluster, the L is proportional to {sigma}^n^ relationship presents systematic slope variations that depend on the wavelength of the photometric bandpass from which L is inferred, the power n increasing towards longer wavelengths. (ii) The relationship for the Virgo galaxies with log {sigma}> 2.0 shows a significantly smaller value of the velocity dispersion exponent for both the optical and IR bands, as compared with the corresponding values found in Coma. (iii) The L_K_ is proportional to {sigma}^n^ and L_K_ is proportional to {sigma}^{alpha}^I^-{beta}^_e_ relationships in our sample, yield exponent values n and {alpha} smaller than those found for the Coma cluster, while the values of {beta} are similar for both clusters. The differences in slope of the L - {sigma} relationships in Virgo as compared to Coma, are to be interpreted in terms of either: (a) an increase of the fraction of kinetic energy invested in rotation for the galaxies in the Virgo cluster with respect to Coma, or (b) a difference in the stellar content of the galaxies in the clusters; or a combination of both effects, and finally (iv) the mass-to-light ratio (M/L) for the early-type galaxies in Virgo presents a stronger dependence on total luminosity than their counterparts in Coma. Key words: near-IR photometry - galaxies - clusters of galaxies - observations
Retrieve 124 NED objects in this reference.
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