X-ray Intraday Variability of Five TeV Blazars with NuSTAR

Abstract

We have examined 40 NuSTAR light curves (LCs) of five TeV emitting high synchrotron peaked blazars: 1ES 0229+200, Mrk 421, Mrk 501, 1ES 1959+650 and PKS 2155-304. Four of the blazars showed intraday variability in the NuSTAR energy range of 3-79 keV. Using an auto correlation function analysis we searched for intraday variability timescales in these LCs and found indications of several between 2.5 and 32.8 ks in eight LCs of Mrk 421, a timescale around 8.0 ks for one LC of Mrk 501, and timescales of 29.6 ks and 57.4 ks in two LCs of PKS 2155-304. The other two blazars' LCs do not show any evidence for intraday variability timescales shorter than the lengths of those observations, however, the data was both sparser and noisier, for them. We found positive correlations with zero lag between soft (3-10 keV) and hard (10-79 keV) bands for most of the LCs, indicating that their emissions originate from the same electron population. We examined spectral variability using a hardness ratio analysis and noticed a general "harder-when-brighter" behavior. The 22 LCs of Mrk 421 observed between July 2012 and April 2013 show that this source was in a quiescent state for an extended period of time and then underwent an unprecedented double peaked outburst while monitored on a daily basis during 10 - 16 April 2013. We briefly discuss models capable of explaining these blazar emissions.

arXiv comment21 pages, 4 figures, 4 tables, Accepted for Publication in ApJ

References in corpus (69)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• On characterising the variability properties of X-ray light curves from active galaxies
• The Spectral Energy Distribution of Fermi bright blazars
• An Exceptional VHE Gamma-Ray Flare of PKS 2155-304
• Variable VHE gamma-ray emission from Markarian 501
• Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
• Fast TeV variability in blazars: jets in a jet
• BeppoSAX Observations of Unprecedented Synchrotron Activity in the BL Lac Object Mkn 501
• Swift observations of the very intense flaring activity of Mrk 421 during 2006: I. Phenomenological picture of electron acceleration and predictions for the MeV/GeV emission
• Implications of very rapid TeV variability in blazars
• Parsec Scale Properties of Markarian 501
• A Multi-wavelength View of the TeV Blazar Markarian 421: Correlated Variability, Flaring, and Spectral Evolution
• Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability
• Multiwavelength Observations of a Flare from Markarian 501
• Rapid variability in TeV blazars: the case of PKS 2155-304
• VHE Gamma Rays from PKS 2155-304
• Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
• X-ray spectral evolution of TeV BL Lac objects: eleven years of observations with BeppoSAX, XMM-Newton and SWIFT satellites
• Quasi-periodicities at year-like timescales in Blazars
• The Parsec-Scale Structure and Jet Motions of the TeV Blazars 1ES 1959+650, PKS 2155-304, and 1ES 2344+514
• The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
• Variability Pattern and the Spectral Evolution of the BL Lacertae Object PKS 2155-304
• Black Hole Masses and Host Galaxy Evolution of Radio-loud Active Galactic Nuclei
• Four Years Monitoring of Blazar PKS 2155-304 with BeppoSAX: Probing the Dynamics of the Jet
• Near Infrared Intraday Variability of Mrk 421
• X-ray Flaring Activity of Mrk 421
• Multiwavelength Monitoring of the BL Lac Object PKS 2155-304 I. The IUE Campaign
• A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?
• Optical Flux and Spectral Variability of Blazars
• Intra-night Optical Variability of Luminous Radio Quiet QSOs
• Infrared Variation of Radio Selected BL Lacertae Objects
• Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton
• Observing Mkn 421 with XMM--Newton: the EPIC--PN point of view
• First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
• Optical variability of the BL Lacertae object GC 0109+224. Multiband behaviour and time scales from a 7-years monitoring campaign
• Quasi-simultaneous two band optical variability of the blazars 1ES 1959+650 and 1ES 2344+514
• Multiwavelength Variability of the Blazars Mrk 421 and 3C 454.3 in the High-State
• Multi-band optical variability of three TeV Blazars on Diverse Timescales
• Very hard gamma-ray emission from a flare of Mrk 501
• A combined radio and GeV gamma-ray view of the 2012 and 2013 flares of Mrk 421
• Violent Hard X-ray Variability of Mrk 421 Observed by NuSTAR in 2013 April
• Long-term study of Mkn 421 with the HAGAR Array of Telescopes
• Variability in Active Galactic Nuclei from Propagating Turbulent Relativistic Jets
• VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011
• BeppoSAX Spectral Survey of BL Lacs - new spectra and results
• Long-term multi-wavelength variability and correlation study of Markarian 421 from 2007 to 2009
• Modeling the Emission from Turbulent Relativistic Jets in Active Galactic Nuclei
• Optical Intraday Variability Studies of Ten Low Energy Peaked Blazars
• Optical quasi-periodic oscillation and color behavior of blazar PKS 2155-304
• MAXI investigation into the longterm X-ray variability from the very-high-energy gamma-ray blazar Mrk 421
• A Rapid X-ray Flare from Markarian 501
• Multi-color Optical Variability of the TeV Blazar Mrk 501 in the Low-State
• Observation of X-ray variability in the BL Lac object 1ES1959+65
• Suzaku Wide Band Analysis of the X-ray Variability of TeV Blazar Mrk 421 in 2006
• Very High Energy outburst of Markarian 501 in May 2009
• Multi-color optical monitoring of Mrk 501 from 2010 to 2015
• The TeV blazar Markarian 421 at the highest spatial resolution
• Peak of spectral energy distribution play an important role in intra-day variability of Blazars?
• Inverse Compton X-ray Emissions from TeV blazar Mrk421 during a Historical Low-Flux State Observed with NuSTAR
• Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state
• Study of underlying particle spectrum during huge X-ray flare of Mkn 421 in April 2013
• Multi-band Variability Analysis of Mrk 421
• The Study of TeV Variability and Duty Cycle of Mrk 421 from 3 Years of Observations with the Milagro Observatory
• Optical and Radio Variability of BL Lacertae
• Flux and spectral variability of the blazar PKS 2155-304 with XMM-Newton: Evidence of Particle Acceleration and Synchrotron Cooling
• Bulk Motion of Ultrarelativistic Conical Blazar Jets
• The Cluster-Scale Environment of PKS 2155-304
• Simultaneous multi-wavelength observations of the TeV Blazar Mrk 421 during February - March 2003: X-ray and NIR correlated variability

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