Investigating the variability of Swift-BAT blazars with NICER
arXiv:2301.09828 · doi:10.1093/mnras/stad225
Abstract
We present results of X-ray spectral and time-domain variability analyses of 4 faint, "quiescent" blazars from the Swift-BAT 105-month catalog. We use observations from a recent, 5-month long NICER campaign, as well as archival BAT data. Variations in the 0.3-2 keV flux are detected on minute, weekly, and monthly timescales, but we find that the fractional variability on these timescales is and decreases on longer timescales, implying generally low-amplitude variability across all sources and showing very low variability on monthly timescales (), which is at odds with previous studies that show that blazars are highly variable in the X-rays on a wide range of timescales. Moreover, we find that the flux variability on very short timescales appears to be characterized by long periods of relative quiescence accompanied by occasional short bursts, against the relatively time-stationary nature of the variability of most other AGN light curves. Our analysis also shows that the broadband X-ray spectra (0.3-195 keV) of our sources can be described with different power law models. As is the case with most blazars, we find that 2 sources (2MASS J09343014-1721215 and PKS 0312-770) are well-modeled with a simple power law, while the remaining two (1RXS J225146.9-320614 and PKS 2126-15) exhibit curvature in the form of a log-parabolic power law. We also find that, in addition to the continuum, PKS 2126-15 requires significant absorption at the soft X-rays (1 keV) to fully describe the observed curvature, possibly due to absorption from the intergalactic medium.
arXiv commentAccepted for publication in MNRAS. 11 pages, 7 figures
References in corpus (77)
- Unified Schemes for Radio-Loud Active Galactic Nuclei
- On the Absorption of X-rays in the Interstellar Medium
- The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
- Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- A Unifying View of the Spectral Energy Distributions of Blazars
- On characterising the variability properties of X-ray light curves from active galaxies
- Where are the Baryons?
- Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array
- Canonical high power blazars
- Non-linear X-ray variability in X-ray binaries and active galaxies
- Measuring the broadband power spectra of active galactic nuclei with RXTE
- X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
- The 105 month Swift-BAT all-sky hard X-ray survey
- Where Are the Baryons? II: Feedback Effects
- Combined Long and Short Timescale X-ray Variability of NGC4051 with RXTE and XMM-Newton
- Constraining Emission Models of Luminous Blazar Sources
- Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: spectral analysis of the complete BeppoSAX wide band X-ray data set
- Gamma-ray Light Curves and Variability of Bright Fermi-Detected Blazars
- The transition between BL Lac objects and Flat Spectrum Radio Quasars
- Swift BAT Survey of AGN
- The Fermi blazar sequence
- X-ray Fluctuation Power Spectral Densities of Seyfert 1 Galaxies
- The Fermi blazars divide
- Extreme synchrotron BL Lac objects
- An Empirical Background Model for the NICER X-ray Timing Instrument
- Log-parabolic spectra and particle acceleration in blazars. III: SSC emission in the TeV band from Mkn 501
- Cooling Time Scales and Temporal Structure of Gamma-Ray Bursts
- Baryons in the CosmicWeb of IllustrisTNG - I: Gas in Knots, Filaments, Sheets and Voids
- Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multi-wavelength Observations
- Correlated Multi-Waveband Variability in the Blazar 3C~279 from 1996 to 2007
- A Cutoff in the X-ray Fluctuation Power Density Spectrum of the Seyfert 1 Galaxy NGC 3516
- Fermi/LAT broad emission line blazars
- Radiative Processes in High Energy Astrophysics
- XMM-Newton spectroscopy of high-redshift QSOs
- Similarity of the Optical-IR and Gamma-Ray Time Variability of Fermi Blazars
- The spectrum of the Broad Line Region and the high-energy emission of powerful blazars
- Very Rapid High-Amplitude Gamma-ray Variability in Luminous Blazar PKS 1510-089 Studied with Fermi-LAT
- Radio to gamma-ray variability study of blazar S5 0716+714
- On the soft X-ray spectra of gamma-loud blazars
- Long-term variability of AGN at hard X-rays
- ASCA and ROSAT X-ray Spectra of High-Redshift Radio-Loud Quasars
- The Enrichment History of Baryons in the Universe
- Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April
- The X-ray absorbing column density of a complete sample of bright Swift Gamma-Ray Bursts
- The hard TeV spectrum of 1ES 0229+200: new clues from Swift
- Gamma-ray loud quasars: a view with BeppoSAX
- Gamma-loud quasars: a view with BeppoSAX
- Polarization microvariability of BL Lac objects
- X-ray absorption evolution in Gamma-Ray Bursts: intergalactic medium or evolutionary signature of their host galaxies?
- The remarkable X-ray variability of IRAS 13224-3809 I: The variability process
- Multi-wavelength and neutrino emission from blazar PKS 1502+106
- A new hard X-ray selected sample of extreme high-energy peaked BL Lac objects and their TeV gamma-ray properties
- Can the soft X-ray opacity towards high redshift sources probe the missing baryons?
- PMN J0525-3343: soft X-ray spectral flattening in a blazar at z=4.4
- Low energy cut-offs and hard X-ray spectra in high-z radio-loud quasars: the Suzaku view of RBS315
- TeV variability in blazars: how fast can it be?
- SSC radiation in BL Lac sources, the end of the tether
- Comprehensive Monitoring of Gamma-ray Bright Blazars. I. Statistical Study of Optical, X-ray, and Gamma-ray Spectral Slopes
- INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)
- Evidence for Nonlinear X-ray Variability from the Broad-line Radio Galaxy 3C 390.3
- Swift observations of high-redshift radio-loud quasars
- Particle-acceleration timescales in TeV blazar flares
- XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption
- The blazar GB1428+4217: a warm absorber at z=4.72?
- BAT AGN Spectroscopic Survey: XVI. General Physical Characteristics of BAT Blazars
- Missing cosmic metals revealed by X-ray absorption towards distant sources
- XMM-Newton Observations of High Redshift Quasars
- XMM-Newton confirmation of a warm absorber in the z=4.4 blazar PMN J0525-3343
- {\it Fermi}-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection
- X-ray absorption towards high-redshift sources: probing the intergalactic medium with blazars
- Multiwavelength variability power spectrum analysis of the blazars 3C 279 and PKS 1510-089 on multiple timescales
- MM-Newton Observations of two high redshift quasars: RX J1028-0844 and BR 0351-1034
- X-ray Absorption of High Redshift Quasars
- Radio and X-ray observations of an exceptional radio flare in the extreme z=4.72 blazar GB B1428+4217
- The Blazar Emission Environment: Insight from Soft X-ray Absorption
- Probing the physical properties of the intergalactic medium using blazars