J/A+AS/129/583 J/A+AS/129/583 Hubble Deep Field surface photometry G Fasano M Filippi F Bertola Astron. Astrophys. Suppl. Ser. 129 583 1998 1998A&AS..129..583F J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996) Galaxies, photometry Photometry, surface galaxies: elliptical and lenticular, cD galaxies: fundamental parameters galaxies: photometry The detailed surface photometry of a sample of early-type galaxies in the Hubble Deep Field is presented as part of a long-term project aimed to settle strong observational constraints to the theories modelling the evolution of elliptical galaxies from the early stages. The sample has been extracted, in the V_606_ band, from the database provided by the ESO-STECF-HDF Group (Couch, 1996, <http://ecf.hq.eso.org>). The selection criteria involve the total magnitude, the number of pixels detected above the background level and an automatic star/galaxy classifier. Moreover, form visual inspection of the frames, we excluded the galaxies showing unambiguous late-type morphology. The analysis of the luminosity and geometrical profiles, carried out on the 162 candidates obeying our selection criteria, resulted in a list of 99 'bona fide' early-type galaxies, for which accurate total magnitudes and effective radii were computed on the basis of the equivalent luminosity profiles. The comparison with the magnitudes given by Williams et al. (1996, Cat. <J/AJ/112/1335>) indicates that the automated photometry tends to underestimate the total luminosity of the ellipticals. The luminosity profiles of most of galaxies in our sample follow fairly well the de Vaucouleurs law ('Normal' profiles). However, a relevant fraction of galaxies, even following the r^1/4^ law in the main body light distribution, exhibit in the inner region a flattening of the luminosity profile not attributable to the PSF (`Flat' profiles) or, in some cases, a complex (multi-nucleus) structure (`Merger' profiles). A statistically significant correlation is found between the shapes of the luminosity profiles and the ellipticity distribution. In particular, the average ellipticity of galaxies belonging to the `Flat' and `Merger' classes is significantly higher than that of the `Normal' galaxies. Finally, even taken into account the relevant uncertainty of the outer position angle profiles, the amount of isophotal twisting of HDF ellipticals turns out to be significantly larger with respect to that of the local samples.

HST/VIS

Name Galaxy name --- RAh Right ascension (2000.0) h RAm Right ascension (2000.0) min RAs Right ascension (2000.0) s DE- Declination sign --- DEd Declination (2000.0) deg DEm Declination (2000.0) arcmin DEs Declination (2000.0) arcsec WBD96 Simbad denomination ([WBD96] N-NNN.nnnn) --- Name Galaxy name --- mag V_606 surface brightness (ST system) mag/arcsec2 Xpos X coord. of the center pix Ypos Y coord. of the center pix Radius Radius along the major axis arcsec Eps Ellipticity = 1-b/a --- PA Position Angle from N to W deg Sin3 {3[theta] term in Fourier expansion}*10 number=1 99.00 --> data are not available 0.1 Cos3 {3[theta] term in Fourier expansion}*10 number=1 99.00 --> data are not available 0.1 Sin4 {4[theta] term in Fourier expansion}*10 number=1 99.00 --> data are not available 0.1 Cos4 {4[theta] term in Fourier expansion}*10 number=1 99.00 --> data are not available 0.1 e_Eps Estimated error of the ellipticity --- e_PA Estimated error of the position angle deg e_Sin3 Estimated error of Sin3 0.1 e_Cos3 Estimated error of Cos3 0.1 e_Sin4 Estimated error of Sin4 0.1 e_Cos4 Estimated error of Cos4 0.1 e_mag Estimated error of surface brightness mag/arcsec2 Patricia Bauer CDS 1997Dec11Gianni Fasano <gfasano@leda.pd.astro.it> J_A+AS_129_583.xml