X-ray emission of radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission

Abstract

To understand the X-ray emission of active galactic nuclei (AGNs), we explored the optical-to-X-ray variation correlation of a radio-loud quasar (RLQ) SDSS J121426.52+140258.9 (hereafter J1214+1402) with multi-epoch observations of Swift and XMM-Newton telescopes. With the historical multi-band data, we found that the infrared to X-ray flux of RLQ J1214+1402 should not be dominated by the beamed jet emission. The Swift optical/UV and X-ray light curves showed that J1214+1402 has two optical states with low flux before 2014 April 08 and high flux after 2014 June 11, but has no significant X-ray variations during the time range between 2007 March 09 and 2014 August 04. This result was supported by the XMM-Newton observations in the overlapped time with Swift. Interestingly, the early XMM-Newton data prior to the Swift time presents two unusual emission epochs when J1214+1402 has relatively low optical fluxes but has the brightest X-ray fluxes. The overall independence of optical-to-X-ray variation seems hard to be described by the disk-corona model. With the X-ray spectral fitting, we find that the soft X-ray excess in J1214+1402 appears only during the high optical state when the X-ray emission is at low state. The soft X-ray excess in J1214+1402 is difficult to be explained by the ionized accretion disk, instead, it may be related to the warm corona.

13 pages, 9 figures, accepted for publication in MNRAS

References in corpus (34)

• A Catalog of Quasar Properties from SDSS DR7
• The VLA Low-frequency Sky Survey
• Roma-BZCAT: A multifrequency catalogue of Blazars
• Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• Correlated Multi-Waveband Variability in the Blazar 3C~279 from 1996 to 2007
• Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability
• The destruction and recreation of the X-ray corona in a changing-look Active Galactic Nucleus
• X-ray Absorption and Reflection in Active Galactic Nuclei
• The multiwavelength variability of 3C 273
• The WISE Blazar-Like Radio-Loud Sources: An All-Sky Catalog Of Candidate Gamma-Ray Blazars
• Rapid accretion state transitions following the tidal disruption event AT2018fyk
• An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044
• The Chandra Survey of Extragalactic Sources in the 3CR Catalog: X-ray Emission from Nuclei, Jets, and Hotspots in the Chandra Archival Observations
• The $L_{\mathrm{x}}$-$L_{\mathrm{uv}}$-$L_{\mathrm{radio}}$ relation and corona-disk-jet connection in optically selected radio-loud quasars
• The 450 days X-ray monitoring of the changing-look AGN 1ES 1927+654
• Extreme ultra-soft X-ray variability in an eROSITA observation of the Narrow-Line Seyfert 1 Galaxy 1H 0707-495
• AGN Coronae Through A Jet Perspective
• MUSE observations of a changing-look AGN I: The re-appearance of the broad emission lines
• Correlated X-ray/UV/optical variability and the nature of accretion disc in the bare Seyfert 1 galaxy Fairall~9
• The first broadband X-ray view of the narrow line Seyfert 1 Ton S180
• A Full Characterisation of the Supermassive Black Hole in IRAS 09149-6206
• The X-ray emission in young radio AGNs
• The X-ray spectral and variability properties of typical radio-loud quasars
• The origin of the soft X-ray excess in the narrow-line Seyfert 1 galaxy SBS 1353+564
• Long-term X-ray evolution of SDSS J134244.4+053056.1: A more than 18 year-old, long-lived IMBH-TDE candidate
• Possible Evidence of a Universal Radio/X-ray Correlation in a near-Complete Sample of Hard X-ray Selected Seyfert Galaxies
• The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars
• The Relation between X-ray and Ultraviolet Variability of Quasars
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• The composite X-ray spectrum of 3CRR Quasars
• A nearby luminous AGN sample optically selected from Hubble Space Telescope (HST)
• Temporal and Spectral Variability of OJ 287 before the April--June 2020 Outburst
• The Origin of X-ray Emission in the Gamma-ray emitting Narrow-Line Seyfert 1 1H 0323+342