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X-ray and optical monitoring of the December 2017 outburst of the Be/X-ray binary AX J0049.4-7323
L. Ducci, C. Malacaria, P. Romano +5
AX J0049.4-7323 is a Be/X-ray binary that shows an unusual and poorly understood optical variability that consists of periodic and bright optical outbursts, simultaneous with X-ray…
AGILE, Fermi, Swift, and GASP-WEBT multi-wavelength observations of the high-redshift blazar 4C 71.07 in outburst
S. Vercellone, P. Romano, G. Piano +56
The flat-spectrum radio quasar 4C 71.07 is a high-redshift (), -loud blazar whose optical emission is dominated by the thermal radiation from accretion disc. 4C 7…
Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array
P. Romano, S. Vercellone, L. Foschini +3
Gamma-ray emitting narrow-line Seyfert 1 (-NLSy1) galaxies are thought to harbour relatively low-mass black holes (10-10 M) accreting close to the Eddington li…
The mid-2016 flaring activity of the flat spectrum radio quasar PKS 2023-07
G. Piano, P. Munar-Adrover, L. Pacciani +8
Flat spectrum radio quasars (FSRQs) can suffer strong absorption above E = 25/(1+z) GeV, due to gamma-gamma interaction if the emitting region is at sub-parsec scale from the super…
IGR J17329-2731: The birth of a symbiotic X-ray binary
E. Bozzo, A. Bahramian, C. Ferrigno +10
We report on the results of the multiwavelength campaign carried out after the discovery of the INTEGRAL transient IGR J17329-2731. The optical data collected with the SOAR telesco…
In-depth study of long-term variability in the X-ray emission of the Be/X-ray binary system AX J0049.4-7323
L. Ducci, P. Romano, C. Malacaria +3
AX J0049.4-7323 is a Be/X-ray binary in the Small Magellanic Cloud hosting a ~750 s pulsar which has been observed over the last ~17 years by several X-ray telescopes. Despite nume…