Simultaneous NICER+NuSTAR spectra of four TeV blazars show that 6 spectra require a blackbody component interpreted as accretion disk emission during low-flux states, plus Gaussian features at 1.4–1.7 keV in Mrk 421.
A., Ansoldi, S., Antonelli, L
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HAWC observations of Mrk 421 reveal a 13±3 TeV cutoff in high states at 3.8σ significance, indicating intrinsic origin and providing EBL intensity upper limits.
New multi-band optical monitoring of quasar 4C 29.45 finds variability amplitudes of 220%, 208%, and 209% in V, R, I; spectral indices 1.032-1.573; achromatic trends; and no short-term periodicity.
citing papers explorer
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X-ray Spectral Properties of Four Classical TeV Blazars using Simultaneous Observations from NICER and NuSTAR
Simultaneous NICER+NuSTAR spectra of four TeV blazars show that 6 spectra require a blackbody component interpreted as accretion disk emission during low-flux states, plus Gaussian features at 1.4–1.7 keV in Mrk 421.
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Constraining the Photon Intensity of Extragalactic Background Light with the HAWC Observatory for the Blazar Mrk 421
HAWC observations of Mrk 421 reveal a 13±3 TeV cutoff in high states at 3.8σ significance, indicating intrinsic origin and providing EBL intensity upper limits.
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Shortterm optical variability of 4C 29.45
New multi-band optical monitoring of quasar 4C 29.45 finds variability amplitudes of 220%, 208%, and 209% in V, R, I; spectral indices 1.032-1.573; achromatic trends; and no short-term periodicity.