OzDES Reverberation Mapping Programme: the first Mg II lags from 5 yr of monitoring

ABSTRACT Reverberation mapping is a robust method to measure the masses of supermassive black holes outside of the local Universe. Measurements of the radiusluminosity (RL) relation using the Mgii emission line are critical for determining these masses near the peak of quasar activity at z 12, and for calibrating secondary mass estimators based on Mgii that can be applied to large samples with only single-epoch spectroscopy. We present the first nine Mgii lags from our 5-yr Australian Dark Energy Survey reverberation mapping programme, which substantially improves the number and quality of Mgii lag measurements. As the Mgii feature is somewhat blended with iron emission, we model and subtract both the continuum and iron contamination from the multiepoch spectra before analysing the Mgii line. We also develop a new method of quantifying correlated spectroscopic calibration errors based on our numerous, contemporaneous observations of F-stars. The lag measurements for seven of our nine sources are consistent with both the H and MgiiRL relations reported by previous studies. Our simulations verify the lag reliability of our nine measurements, and we estimate that the median false positive rate of the lag measurements is $4{{
m per cent}}$.

Yu, Z., Martini, P., Penton, A., Davis, T. M., Malik, U., Lidman, C., ... Tucker, D. L.

Yu, Zhefu||Martini, Paul||Penton, A||Davis, TM||Malik, U||Lidman, C||Tucker, BE||Sharp, R||Kochanek, CS||Peterson, BM||Aguena, M||Allam, S||Andrade-Oliveira, F||Annis, J||Asorey, J||Bertin, E||Brooks, D||Burke, DL||Calcino, J||Carnero Rosell, A||Carollo, D||Carrasco Kind, M||Costanzi, M||da Costa, LN||da Silva Pereira, MES||Diehl, HT||Everett, S||Ferrero, I||Flaugher, B||Frieman, J||Garcia-Bellido, J||Gaztanaga, E||Gerdes, DW||Gruen, D||Gruendl, RA||Gschwend, J||Gutierrez, G||Hinton, SR||Hollowood, DL||James, DJ||Kim, A||Kron, R||Kuehn, K||Kuropatkin, N||Lewis, GF||Maia, MAG||March, M||Marshall, JL||Menanteau, F||Miquel, R||Morgan, R||Moller, A||Palmese, A||Paz-Chinchon, F||Plazas, AA||Sanchez, E||Scarpine, V||Serrano, S||Sevilla-Noarbe, I||Smith, M||Soares-Santos, M||Suchyta, E||Tarle, G||Thomas, D||To, C||Tucker, DL

OzDES Reverberation Mapping Programme: the first Mg II lags from 5 yr of monitoring Academic Article