Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..175z&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 175-184.
Astronomy and Astrophysics
Astronomy
27
Astronomical Photometry, Elliptical Galaxies, Galactic Nuclei, Galactic Structure, Radio Jets (Astronomy), Spectrophotometry, Black Holes (Astronomy), Charge Coupled Devices, Emission Spectra, Radio Spectra, Ubv Spectra
Scientific paper
High-resolution UBVRI surface photometry of the nearby elliptical NGC 4486 is presented. The subtraction of the contributions of the unresolved nuclear component and the jet structure allows an accurate study also of the inner galaxy regions. The major axis of the core isophotes is found to be aligned with the jet axis, while in the region above 3 arcsec the isophotes are, on the contrary, nearly perpendicular to it. On the basis of photometry performed on the isolated jet structure, a change of the spectral index at the position of knot A onwards is found to be significant at the 3-sigma level. In addition, the radio-optical spectral index in the eastern radio lobe is shown to steepen in the surroundings of the hotspot. The available kinematic data have insufficient resolution to be constrained by the photometric results, and thereby to verify the presence of a supermassive black hole.
Moller Palle
Stiavelli Massimo
Zeilinger Werner W.
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