Searching for the hidden broad-line region in Centaurus A
Author
Alexander, D.M.
Hough, J.
Young, S.
Bailey, J.
Heisler, C.A.
Lumsden, S.
Robinson, A.
Attention
2299/3187
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 Brγ is not detected and we place a 3σ upper limit of 3.9 × 10-15 erg s-1 cm-2 in polarized flux. We find a correlation between the K-band nuclear continuum and broad Hα line luminosity and estimate the strength of broad Brγ based on a number of possible models.