UV Continuum And Emission Line Variability study of Mrk 841
Keywords:Active Galactic Nuclei, active galaxies, continuum flux, emission line flux, relative variability amplitudes, normalised excess variance, light curve., line flux ratio
Seyfert galaxies and quasars are the most interesting class of objects among the active galaxies. They exhibit continuum and line flux variability over a long range of wavelengths and time scales. This paper presents the long-term variability study of Mrk 841 using the spectroscopic data obtained by the International Ultraviolet Explorer (IUE) satellite. The IUE”s archival data has been very useful in characterizing the continuum as well as the emission line variability in MRK 841, a nearby bright and variable Seyfert 1 galaxy. We present our results for the first time on long-term and continuum variability in MRK 841from IUE’s final archive. From the Fvar analysis, we have found the UV continuum to vary by 60 % as the highest at 3025 Å with 10 % variability as the lowest at 2225 Å corresponding to the long-term observational period of 1988 - 1993.
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, 23P-27
Salvati M, Hunt LK, 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 FJ, 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.
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.