NOAO >   Observing Info >   Approved Programs >   2017A-0186

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Program Information for 2017A-0186


PI: Stefano Marchesi, Clemson U., smarche@clemson.edu
Address: Physics Department, 118 Kinard Laboratoty, Clemson, SC 29631 United States

CoI: Marco Ajello, Clemson U.
CoI: Amanpreet Kaur, Clemson U.
CoI: Alberto Dominguez, Universidad Complutense de Madrid
CoI: Dieter H Hartmann, Clemson U.
CoI: Vaidehi Paliya, Clemson U.
CoI: Nuria Alvarez-Crespo, Osservatorio Astrofisico di Torino
CoI: Francesco Massaro, Osservatorio Astrofisico di Torino

Title: Towards the first complete sample of >50 GeV blazars

Abstract: We propose to acquire the intermediate resolution optical spectra of 23 blazars that have been recently detected above 50 GeV by the Fermi Large Area Telescope (in the 2FHL catalog) and lack redshift information. Our primary objective is to determine the redshift of these objects, or, at least, to constrain a lower limit. The redshift information will allow us to study the interaction of high-energy ($>$50 GeV) photons with the extra-galactic background light (EBL) allowing us to probe how the intensity of the EBL changes with redshift. Knowledge of the EBL and its still unknown evolution with redshift is much desired to constrain the integrated emission of galaxies. The acquired optical spectra will also allow us to categorize the targeted blazars into BL Lac objects or flat spectrum radio quasars.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  KP-4m/KOSMOS -- 1.5n on Jul 14 - Jul 15 2017


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0186

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