The low redshift quasar host galaxies and enviroments

We investigate the properties of the galaxies hosting quasars in about 400 low redshift (z < 0.5) SDSS QSO that are in the "Stripe 82" sky area. For this region deep (r~22.4 mag) u, b,v,r and i images are available and allow us to study both the host galaxy and the Mpc scale environments. This sample greatly outnumber previous studies of low-z QSOs.

 

 

We present preliminary results of the properties of quasars activity and in particular we focus on the relationships among host galaxy luminosity, black hole mass, radio emission and the surrounding galaxy environments. We select from the SDSS - QSO Catalogue all the QSOs in the range of redshift 0.1<z<0.5 and in the Stripe82 region. This gives a total of 416 QSO. In this sample we are dominated by radio quiet quasars (about 5% are radio loud). We implemented an automated procedure using AIDA to decompose the QSO images into nucleus and host galaxy luminosity. After masking of all contaminating sources in the field a 2D fitting is performed using PSF + galaxy model. 

 

 

 

 

 

---