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SUMMARY:Photometric redshifts for high-z quasars in the era of LSST - Kath
 erine Kauma
DTSTART:20240131T131500Z
DTEND:20240131T134000Z
UID:TALK211600@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:High-redshift (z>5) quasars have an important role in galaxy f
 ormation and evolution\, including the growth of supermassive black holes\
 , the coevolution of black holes and galaxies\, and changes in the ionizat
 ion state of the Universe. However\, conventional methods for identifying 
 high redshift quasars face challenges like high false-positive rates and r
 equire resource-intensive spectroscopic follow-up. With the upcoming data 
 influx from optical deep wide area. imaging surveys like Vera Rubin Observ
 atory Legacy Survey of Space and Time (LSST)\, the need for more efficient
  methodologies becomes crucial.\nThis presentation introduces a new approa
 ch to identifying and characterising high-redshift quasars via optical and
  infrared Spectral Energy Distribution (SED) fitting\, with an emphasis on
  reliable photometric redshifts. Our SED fitting method characterises quas
 ar candidates by redshift\, host galaxy contribution\, intrinsic reddening
 \, and luminosity. Additionally\, we present a new empirical model for int
 ergalactic hydrogen absorption. By comparing fits between quasar\, galaxy\
 , and star models\, we are able to reduce rates of foreground contaminatio
 n.  The methodology presented shows promise in identifying quasar candidat
 es and validating known objects\, presenting an efficient avenue for disco
 veries and insights into the early Universe.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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