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Title:
Searching for the hidden broad-line region in Centaurus A
Authors:
Alexander, D. M.; Hough, J. H.; Young, S.; Bailey, J. A.; Heisler, C. A.; Lumsden, S. L.; Robinson, A.
Affiliation:
AA(Department of Physical Sciences, University of Hertfordshire, Hatfield, Hertfordshire AL10 9AB ), AB(Department of Physical Sciences, University of Hertfordshire, Hatfield, Hertfordshire AL10 9AB ), AC(Department of Physical Sciences, University of Hertfordshire, Hatfield, Hertfordshire AL10 9AB ), AD(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AE(Mount Stromlo and Siding Springs Observatory, Research School for Astronomy and Astrophysics, Institute of Advanced Studies, The Australian National University, Weston Creek Post Office, Canberra, ACT 2611, Australia ), AF(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AG(Department of Physical Sciences, University of Hertfordshire, Hatfield, Hertfordshire AL10 9AB )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 2, pp. L17-L22. (MNRAS Homepage)
Publication Date:
02/1999
Origin:
MNRAS
MNRAS Keywords:
POLARIZATION, TECHNIQUES: POLARIMETRIC, TECHNIQUES: SPECTROSCOPIC, GALAXIES: ACTIVE, GALAXIES: INDIVIDUAL: CEN A
DOI:
10.1046/j.1365-8711.1999.02327.x
Bibliographic Code:
1999MNRAS.303L..17A

Abstract

We present the first near-infrared (K-band) spectropolarimetric observations of the nuclear region of Centaurus A. Although the data are of high signal-to-noise ratio, polarized broad Br gamma is not detected and we place a 3 sigma upper limit of 3.9 x 10-15 erg s-1 cm-2 in polarized flux. We find a correlation between the K-band nuclear continuum and broad H alpha line luminosity and estimate the strength of broad Br gamma based on a number of possible models.

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