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arXiv:astro-ph/0504461 (astro-ph)
[Submitted on 21 Apr 2005]

Title:NIR observations of dEs in the Virgo cluster: a structural continuity with giant Ellipticals

Authors:Stefano Zibetti (MPE-Garching), the GOLDMiNe Research Team
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Abstract: The structural properties of a sample of 50 dEs in the Virgo cluster are here derived from Near InfraRed (NIR, H-band 1.65 micron) surface photometry and analysed. One-dimensional surface brightness (SB) profiles are extracted using elliptical isophote fitting. They are characterised by means of structural parameters, namely the half light radius R_e, the average surface brightness within R_e (mu_e), and a concentration index (c_31). We show that typical dEs have close-to-exponential NIR SB distributions. The relations between dEs and giant ellipticals (Es) are investigated by comparing the NIR structural parameters of 273 Es in nearby clusters. Further analysis is conducted using the optical-NIR colour B-H and by studying the relationships between structural and dynamical parameters (fundamental plane) for the two classes of galaxies. The transition between the two regimes is smooth and no dichotomy is seen.
Comments: 2 pages, 2 figures, use this http URL. Poster presentation to appear in the proceedings of "IAU Colloquium 198 - Near-Field Cosmology with Dwarf Elliptical Galaxies", Les Diablerets 14-18 March 2005, B. Binggeli and H. Jerjen eds. GOLDMiNe website at this http URL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504461
  (or arXiv:astro-ph/0504461v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504461
Related DOI: https://doi.org/10.1017/S174392130500414X

Submission history

From: Stefano Zibetti [view email]
[v1] Thu, 21 Apr 2005 07:58:42 UTC (82 KB)
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