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J/AJ/116/102                NGC 5548 BR photometry        (Tyson+ 1998)

Deep optical imaging of the bright Seyfert galaxy NGC 5548: a long, very low surface brightness tail. Tyson J.A., Fischer P., Guhathakurta P., McIlroy P., Wenk R., Huchra J., Macri L., Neuschaefer L., Sarajedini V., Glazebrook K., Ratnatunga K., Griffiths R. <Astron. J. 116, 102 (1998)> =1998AJ....116..102T (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Photometry Keywords: galaxies: clusters: general - galaxies: individual: NGC 5548 - galaxies: Seyfert Abstract: 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/arcsec2) tidal tail is associated with NGC 5548, it extends at least 80kpc from it and has an absolute magnitude of M_V~-16.4 (H0=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 reff=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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 57 99 BR photometry in the NGC 5548 field
See also: J/A+A/314/43 : NGC 5548 Profile variability (Kollatschny+ 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- [TFG98] Star name (NGC 5548-NN) 13- 14 I2 h RAh Right ascension (J2000.0) 16- 17 I2 min RAm Right ascension (J2000.0) 19- 23 F5.2 s RAs Right ascension (J2000.0) 25 A1 --- DE- Declination sign 26- 27 I2 deg DEd Declination (J2000.0) 29- 30 I2 arcmin DEm Declination (J2000.0) 32- 35 F4.1 arcsec DEs Declination (J2000.0) 37- 41 F5.2 mag Bmag B magnitude 43- 46 F4.2 mag e_Bmag rms uncertainty on Bmag 48- 52 F5.2 mag B-R B-R colour index 54- 57 F4.2 mag e_B-R rms uncertainty on B-R
Acknowledgements: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 09-Nov-1998
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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