UV Continuum And Emission Line Variability study of Mrk 841 using IUE data
DOI:
https://doi.org/10.12723/mjs.57.1Keywords:
Active Galactic Nuclei, active galaxies, continuum flux, emission line flux, relative variability amplitudes, normalised excess variance, light curve., line flux ratioAbstract
Seyfert galaxies and quasars are the most interesting objects among the different types of active galaxies as they show the continuum and line variability over a long range of wavelength and time scales. The long term observations at the UV wavelength region would be useful in understanding the possible correlations among accretion disk properties with the physical conditions in BLR regions. In this paper, we present our results on the long-term continuum and emission-line variability studies on Mrk 841, a bright nearby active galaxy using the IUE’s spectroscopic data from 1978 to 1993. The final archival data has helped us to characterise the continuum and the emission line variability observed nearly over 15 years. We have obtained Rmax values as 2.24, 2.04, 1.87, 2.28, 1.30, 2.31, 2.17, 3.59, 2.01 and Fvar (in %) parameters as 27.33, 26.34, 26.37, 26.41, 10.73, 23.00, 23.80, 41.26, 60.20 corresponding to the continuum windows centered
References
Edelson R.A., Alexander T., Crenshaw D M. et al. “Multiwavelength Observations of Short-Timescale Variability in NGC 4151. IV. Analysis of Multiwavelength Continuum Variability”, ApJ, 1996, 470, 364
Wanders I, Peterson BM, Alloin, D, et al., “Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC 7469”, ApJSs, 1997, 113, 1, 69-88
Nandra K, Clavel J, Edelson R.A.et al., “New Constraints on the Continuum Emission Mechanism of Active Galactic Nuclei: Intensive Monitoring of NGC 7469 in the X-Ray and Ultraviolet”, ApJ, 1998, 505, 2, 594-606
Glass IS, “Infrared variability of the Seyfert galaxy NGC 3783”, MNRAS, 1992, 256, 23-27
Salvati M, Hunt L K, Calamai G, et al. “Variability and emission mechanism in Seyfert 1 galaxies: a near-infrared outburst in NGC 4051”, A&A, 1993, 274, 174-180
Peterson BA, “Evidence of Light Variation in NGC 1275”, ApJL, 1969, 3, 103
Johnstone R M, Fabian AC, “The HST ultraviolet spectrum of the nucleus of NGC 1275: Fermi-accelerated Lyalpha emission”, MNRAS, 1995, 273, 3, 625-631
Punsly B, Marziani P, Bennert VN, “Revealing the Broad Line Region of NGC 1275: The Relationship to Jet Power”, ApJ, 2018, 869, 2, 143
Morini M, Scarsi L, Molteni D et al. “Simultaneous EXOSAT and IUE Observations of Fairall 9: Short and Long-Term Variability”, ApJ, 1986, 307, 486
Lohfink AM, Reynolds CS, Vasudevan R, “The Fast UV Variability of the Active Galactic Nucleus in Fairall 9”, ApJ, 2014, 788, 10
Naik S, Pal M, Kumari N, “Short-term variabilities in X-ray/Optical/UV emission from Seyfert 1 galaxy NGC 4593”, BSRS, 2019, 88, 143-151
Pal M, Naik S, “Correlated X-ray/UV/optical emission and short-term variability in a Seyfert 1 galaxy NGC 4593”, MNRAS, 2018, 474, 4, 5351-5362
Walter R, Orr A, Courvoisier TJ, et al. “Simultaneous observations of Seyfert 1 galaxies with IUE, ROSAT and GINGA”, A&A, 1994, 285, 119-131
Nandra K, Turner TJ, George IM, et al. “Soft X-ray and ultraviolet observations of MRK 841: implications for the blue bump”, MNRAS, 1995, 273, 1, 85-92
Elvis M, Lockman F J, Wilkes BJ, “Accurate Galactic N(H) Values Toward Quasars and AGN” Astrophysical Journal,1989, 97, 777
HI4PI Collaboration, Ben Bekhti, N. & Floer, L. et al., 2016, “HI4PI: A full-sky H I survey based on EBHIS and GASS”, A&A, 594, A116.
Vaughan, S., Edelson, R., Warwick, R. S., & Uttley, P., 2003, “On characterizing the variability properties of X-ray light curves from active galaxies”, MNRAS, 345(4):1271-1284.
Vedavathi, P., and Doddamani. VH, 2018, “Short timescale UV variability study in NGC 4151 using IUE data”, JAA, 39(5):55.
J. Kwan and J. H. Krolik, 1981, “The formation of emission lines in Quasars and Seyfert galaxy Nuclei,” ApJ., vol. 250, 478-507
Additional Files
Published
Issue
Section
License
Copyright (c) 2021 Bryan Rithesh Miranda, Dr. Vijayakumar H Doddamani, Dr. Vedavathi P
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
