Deep optical imaging of the bright Seyfert galaxy NGC 5548: a long, very low surface brightness tail. J/AJ/116/102 J/AJ/116/102 NGC 5548 BR photometry Deep optical imaging of the bright Seyfert galaxy NGC 5548: a long, very low surface brightness tail. J A Tyson P Fischer P Guhathakurta P McIlroy R Wenk J Huchra L Macri L Neuschaefer V Sarajedini K Glazebrook K Ratnatunga R Griffiths Astron. J. 116 102 1998 1998AJ....116..102T J/A+A/314/43 : NGC 5548 Profile variability (Kollatschny+ 1996) Galaxies, Seyfert Photometry galaxies: clusters: general galaxies: individual (NGC 5548) galaxies: Seyfert Deep Hubble Space Telescope Wide Field Camera (WFC-1) imaging of a region 3.7' east of the V=13mag Seyfert galaxy NGC 5548 in the F555W and F785LP bands, and deep ground-based V and I imaging, show a new extended, blue, low surface brightness structure, apparently a remnant of a tidal interaction associated with NGC 5548. If this straight, low surface brightness (V~27-28mag/arcsec^2^) tidal tail is associated with NGC 5548, it extends at least 80kpc from it and has an absolute magnitude of M_V~-16.4 (H_0_=65km/s/Mpc). Previous imaging surveys of Seyfert galaxies would have missed such low surface brightness tails. Morphologically similar to some brighter tails seen in other interacting systems and in simulations of merging galaxies, this faint tail is a useful diagnostic of an earlier interaction and of the progenitors' halo-to-disk mass ratios. Luminous ripples and a brighter tail wrapped around the galaxy are seen in the inner 1-10kpc region. Unresolved blue objects in the long tail have the colors and absolute magnitudes of young globular clusters. Taken together, the two tails and other features suggest that two spirals merged less than ~1Gyr ago. The inner luminosity profile of NGC 5548 is a good fit to a de Vaucouleurs profile with r_eff_=5.8kpc. Recent simulations of merged galaxies with high-mass halos fail to form lasting tidal tails, suggesting that the NGC 5548 progenitor spirals had modest halo masses.
BR photometry in the NGC 5548 field [TFG98] Star name (NGC 5548-NN) --- RAh Right ascension (J2000.0) h RAm Right ascension (J2000.0) min RAs Right ascension (J2000.0) s DE- Declination sign --- DEd Declination (J2000.0) deg DEm Declination (J2000.0) arcmin DEs Declination (J2000.0) arcsec Bmag B magnitude mag e_Bmag rms uncertainty on Bmag mag B-R B-R colour index mag e_B-R rms uncertainty on B-R mag James Marcout, Patricia Bauer CDS 1998Nov09From AJ electronic version J_AJ_116_102.xml