2013A&A...552A.134D


C.D.S. - SIMBAD4 rel 1.7 - 2021.07.26CEST23:26:46

2013A&A...552A.134D - Astronomy and Astrophysics, volume 552A, 134-134 (2013/4-1)

Discovery of transient high-energy γ-ray emission from the BL Lacertae object 5C 3.178.

DICKINSON H. and FARNIER C.

Abstract (from CDS):

We report the serendipitous discovery of transient, point-like high energy γ-ray emission coincident with the position of the suspected BL Lac object 5C 3.178. The source was detected using the Fermi Large Area Telescope (LAT) at a significance level of ∼8σ during a 200 day period which began on November 17th 2011 (MJD 55882). The observed γ-ray emission is characterised by a moderate 0.2-300 GeV flux F0.2–300GeV=(8.22±2.04)x10–9ph/cm2/s and a hard power law spectrum with spectral index Γ=1.76±0.09. These properties appear consistent with the known sub-population of TeV γ-ray-emitting BL Lac objects, implying that the source may be detectable using atmospheric Cherenkov telescope arrays. Moreover, the temporal variability of the source suggests that real-time searches of the Fermi-LAT all-sky dataset for weak emission on ∼200 day timescales may represent a rewarding strategy.

Abstract Copyright:

Journal keyword(s): astroparticle physics - BL Lacertae objects: individual: 5C 3.178 - gamma rays: galaxies

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [HPH2013] 149 XB? 00 42 43.68 +41 25 18.6           ~ 27 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11371 1
3 5C 3.178 BLL 00 47 55.2233876412 +39 48 57.608728891   16.0   16.4   ~ 37 1

    Equat.    Gal    SGal    Ecl

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2021.07.26-23:26:46

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