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In the last decade, using single epoch virial based techniques in the opticalband, it has been possible to measure the central black hole mass on large AGN1samples. However these measurements use the width of the broad line region as aproxy of the virial velocities and are therefore difficult to be carried out onthose obscured (type 2) or low luminosity AGN where the nuclear component doesnot dominate in the optical. Here we present the optical and near infraredspectrum of the starburst/Seyfert galaxy NGC 6221, observed with X-shooter/VLT.Previous observations of NGC 6221 in the X-ray band show an absorbed (N_H=8.5+/- 0.4 x 10^21 cm^-2) spectrum typical of a type 2 AGN with luminositylog(L_14-195 keV) = 42.05 erg/s, while in the optical band its spectrum istypical of a reddened (A_V=3) starburst. Our deep X-shooter/VLT observationshave allowed us to detect faint broad emission in the H_alpha, HeI and Pa_betalines (FWHM ~1400-2300 km/s) confirming previous studies indicating that NGC6221 is a reddened starburst galaxy which hosts an AGN. We use the measure ofthe broad components to provide a first estimate of its central black hole mass(M_BH = 10^(6.6 +/- 0.3) Msol, lambda_Edd=0.01-0.03), obtained using recentlycalibrated virial relations suitable for moderately obscured (N_H<10^24 cm^-2)AGN.

Detection of Faint BLR Components in the Starburst/Seyfert Galaxy NGC 6221 and Measure of the Central BH Mass