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Published March 2012 | Published
Journal Article Open

Dynamically evolving Mg II broad absorption line flow in SDSS J133356.02+001229.1


We report a dynamically evolving low-ionization broad absorption line (BAL) flow in the QSO SDSS J133356.02+001229.1 (at z_(em)∼ 0.9197). These observations are part of our ongoing monitoring of low-ionization BAL QSOs with the 2-m telescope at IUCAA Girawali Observatory (IGO). The broad Mg ii absorption with an ejection velocity of 1.7 × 10^4 km s^(−1), found in the Sloan Digital Sky Survey (SDSS) spectra, has disappeared completely in our IGO spectra. We found an emerging new component at an ejection velocity of 2.8 × 10^4 km s^(−1). During our monitoring period this component has shown strong evolution both in its velocity width and optical depth and nearly disappeared in our latest observations. Acceleration of a low-velocity component seen in SDSS spectrum to a higher velocity is unlikely as the Mg ii column densities are always observed to be higher for the new component. We argue that the observed variations may not be related to ionization changes and are consistent with absorption produced by multistreaming flow transiting across our line of sight. We find a possible connection between flux variation of the QSO and N(Mg ii) of the newly emerged component. This could mean the ejection being triggered by changes in the accretion disc or dust reddening due to the outflowing gas.

Additional Information

© 2012 The Author.s Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2011 December 30. Received 2011 November 26; in original form 2011 October 30. Article first published online: 7 Feb 2012. We wish to acknowledge the IUCAA/IGO staff for their support during our observations. In particular, we thank Dr Vijay Mohan for continued support. MV gratefully acknowledges University Grants Commission, India, for support through RFSMS Scheme and IUCAA for hospitality, where most of this work was done. RS gratefully acknowledges the support from the Indo-French Center for the Promotion of Advanced Research (Centre Franco-Indien pour la promition de la recherche avancée) under project N. 4304-2.

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