Studies of optical/gamma-ray flares of blazar 4C +01.02: Recent updates from the 2016-2017 observations

Fermi-LAT collaboration

Research output: Contribution to journalConference article

Abstract

The flat spectrum radio quasar 4C +01.02 became one of the brightest active galactic nuclei detected at high redshift (z = 2.1) in gamma rays when it underwent a series of outbursts during several months in 2016. We monitored this source in gamma rays using the Large Area Telescope onboard of the Fermi spacecraft (Fermi-LAT), and in optical using the Las Cumbres Observatory (LCO). The highest peak flux detected was F(E > 100 MeV) = (2.8 ± 0.3) 10−6 ph cm−2 s−1 on 10 July 2016 (MJD 57579, daily average). We also obtained optical spectropolarimetry with the Robert Stobie Spectrograph on the Southern African Large Telescope (SALT-RSS) and observed a degree of linear polarisation of up to 10% during flaring states, and ∼1% during a quiescent period. We report recent updates we obtained in our time-domain and spectral studies of this source in July–August 2016, November–December 2016, and July 2017.

Original languageEnglish (US)
Article number013
JournalProceedings of Science
Volume319
StatePublished - Jan 1 2017
Event5th Annual Conference on High Energy Astrophysics in Southern Africa, HEASA 2017 - Johannesburg, South Africa
Duration: Oct 4 2017Oct 6 2017

All Science Journal Classification (ASJC) codes

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