A Catalog of Candidate High-redshift Blazars for GLAST

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Presentation transcript:

A Catalog of Candidate High-redshift Blazars for GLAST TERSI ARIAS San Francisco State University Mentor: JENNIFER CARSON Stanford Linear Accelerator Center SULI 2006

GLAST Gamma-ray Large Area Space Telescope GLAST Large Area Telescope (LAT) GLAST is a high-energy gamma-ray observatory Scheduled to launch in September 2007 Large Area Telescope (LAT) g-ray detection from 20 MeV – >300 GeV. Much greater sensitivity with respect to previous instruments. It is estimated that GLAST will find thousands of new sources.

What is a Blazar? Hubble Space Telescope optical jet image of blazar 3C279 Artist rendition of an AGN Blazars are a subset of active galactic nuclei (AGN), with relativistic jets oriented at small angles to the line of sight of the observer. q ~ 1o  blazar

Spectral Energy Distribution (SED) of a Blazar SED Characteristic double peak suggests synchrotron radiation and inverse-Compton scattering Exponent of power-law in SED interval F = n -a a = -log (F2/F1) Radio Spectral Index of Blazars Flat spectrum a < 0.5 Spectral Index a Maraschi et al. 1994 log (n1/n2) Spectral energy distribution of well studied blazar 3C279.

Redshift Distribution of Known Blazars Low number of high-redshift blazars known Why are high- redshift blazars interesting? Solid: All CGRaBS blazars Broken: BL Lacs x 2 From Candidate Gamma-Ray Blazar Survey by Stephen Healey (SLAC)

Extragalactic Background Light Studying the EBL is one motivation for producing a high-redshift blazar catalog

Procedures to Find Catalog Candidates NASA extragalactic database NED Criteria: High-redshift z > 2.5 Radio source Brighter than 70 mJy How to find a ?: a=-log (F1/F2)/ log (n1/n2) a <0.5  blazar ! Finding Fluxes Surveys: NRAO/VLA Sky Survey - 1.4GHz band Catalogs: Texas – 0.365GHz band 87 Green Bank – 4.85GHz band

Results  307 objects for preliminary list of blazars Table Sample Table ~ 200 objects with flat spectrum a < 0.5 

CONCLUSION Future Work Related Created a catalog of ~200 high-redshift blazars to be detected by GLAST Greatly expands the sample of high-redshift blazars This of blazars can be used to study the EBL Future Work Related ApJS paper Other uses for this catalog (ask Teddy Cheung)

Jennifer Carson (my mentor) ACKNOWLEDGMENTS Thank you Jennifer Carson (my mentor) Teddy Cheung SLAC-KIPAC SULI Students