This year I have focused on cool outflows associated with class of AGN known as Blazars. It is believed that the
cool gas clouds (eg.MgII absorption system) with velocities βc ≤ 5000 km/s relative to the background quasars are
associated to quasar itself (associated system) however absorber with velocity offset beyond this limit are ‘intervening
system’ and their presence is completely independent of background quasar. Recent evidence, however, appears to
question this canonical view and suggests that even associated systems can have significantly relativistic velocities
relative to the background quasar, in case the quasar is undergoing powerful jet activity and/or ejecting high speed
accretion-disk outflows (Bergeron et al.2011). A possible signature of this would be if the occurrence rate, dN/dz, of
‘intervening’ absorbers is found to differ for background sources with and without powerful jets. The reason behind
this departure is attributed to the powerful jets activities along the line of sight of observer which are responsible for
an excess in value of dN/dz and hence are the main source of intrinsic cool outflows. With this motivation whether or
not the existence of excess cool absorbers is related to background source we have used a sample of 97 Blazars with 0.5
<z <2 which comprises the data from V´eron-Cetty & V´eron and ROMA-BZCAT catalog. SAO and HCT spectroscopic
data are reduced using IRAF. FORS-VLT data reduction is performed using an automated pipeline. I have developed
a complete automated reduction pipeline for VLT spectra in LSS mode, which is capable of reducing n objects spectra
at a time. I have also developed an automated CL script for reduction purpose using IRAF. On our whole sample,
we performed contiuum fitting, using a code written in Yorick. To identify MgII absorber intercepted along the line of
sight we used an IDL routine. We performed searching over MgII absorbers for both strong( 1.0 ˚ A≤ wr < 100.00˚ A)
and weak( 0.3 ˚ A≤ wr < 1.0˚ A) systems. Calculation of dN/dz is governed by using an IDL program. Our final result
shows dN/dz towards blazars is similar to that known for QSOs for weak systems, however we report an excess for
the case of strong systems. We emphasize the need for a large sample in order to draw conclusion on the background
source dependent number density of MgII absorbers.
My future work would be on study of nature and origin of high velocity quasar outflows for understanding the dynamics
of gas in the central regions of AGNs as well as the metal enrichment of the IGM. Study of variabilities are important
to understand the location and physical conditions in the absorbing gas and the physical mechanisms responsible for
these outflows. The most interesting cases are the ones where the flow emerges afresh or disappears completely. For
this purpose we will use a sample of BAL QSOs, which are identified to contain at least one CIV component, with
known completely emerged or disappeared multi-epoch observations. Further I wish to carry out my analysis followed
by spectral variation of CIV BAL using the ADFOSC on 3.6m telescope.