SIMBAD references

2020ApJ...900...72L - Astrophys. J., 900, 72-72 (2020/September-1)

Awakening of two Gamma-ray High-redshift, flat-spectrum radio quasars in the southern hemisphere.

LI S., SUN L.-M., LIAO N.-H. and FAN Y.-Z.

Abstract (from CDS):

High-redshift blazars are valuable tools to study the early universe. So far, only a handful of γ-ray blazars have been found at redshifts above 3. Gamma-ray signals are detected in the direction of PMN J2219-2719 (z = 3.63) and PMN J2321-0827 (z = 3.16) by analyzing the 10 yr Fermi-LAT Pass 8 data. PMN J2219-2719 is not distinguished from the background in the global analysis. During the 5 month epoch, the TS value is 47.8 and the flux is more than 10 times that of the 10 yr averaged flux. In addition, the angular distance between the γ-ray position and the radio position of PMN J2219-2719 is only 0.°04. Moreover, the long timescale γ-ray and infrared light curves are very similar, which supports the association between the γ-ray source and PMN J2219-2719. The global analysis of PMN J2321-0827 suggest a new γ-ray source; during the flare phase, the TS value is 61.4 and the γ-ray flux increased significantly. The association probability suggests that PMN J2321-0827 may be the counterpart of the new γ-ray source. In the future, the number of high-redshift γ-ray sources will increase by combining Fermi-LAT and the upcoming Large Synoptic Survey Telescope.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy jets - Quasars - Gamma-ray sources - Non-thermal radiation sources - High-redshift galaxies

Simbad objects: 14

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