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Intra-night optical variability study of a non-jetted narrow-line Seyfert 1 galaxy: SDSS J163401.94+480940.1

Abstract

SDSS J163401.94\(+\)480940.1 is a non-jetted radio-loud narrow-line Seyfert 1 (NLSy1) galaxy. Optical monitoring of this object was carried out in two intra-night sessions each \(\ge\)3 h with 3.6-m DOT. Intra-night optical variability characterization is presented for the first time for this source. We have detected an unexpected remarkable flare in one of two monitoring sessions of SDSS J163401.94\(+\)480940.1, whose rapid brightening phase implied a minute like doubling time of \(\sim\)22 min, thereby approaching the extremely fast minute like variability, observed from FSRQ PKS 1222\(+\)21 at 400 GeV. The detection of a minute-like variability suggests the existence of relativistic jets with a small viewing angle. We briefly discuss the possible mechanisms for the non-detection of relativistic jets in its very long baseline array observations.

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Notes

  1. https://heasarc.gsfc.nasa.gov/docs/heasarc/missions/fermi.html.

  2. Image reduction and analysis facility (http://iraf.noao.edu/).

  3. Dominion Astrophysical Observatory Photometry (http://www. astro.wisc.edu/sirtf/daophot2.pdf).

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Acknowledgments

The author thanks an anonymous referee for his/her very important comments that have improved this paper considerably. The author is very grateful to Prof. Hum Chand for his helpful discussion and useful suggestions. Also, he thanks the concerned ARIES staff for assistance during the observations obtained at the 3.6-m Devasthal optical telescope (DOT), which is a National Facility run and managed by ARIES, an autonomous Institute under the Department of Science and Technology, Government of India.

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Correspondence to Vineet Ojha.

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This article is part of the Special Issue on ‘‘Astrophysical Jets and Observational Facilities: A National Perspective’’.

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Ojha, V. Intra-night optical variability study of a non-jetted narrow-line Seyfert 1 galaxy: SDSS J163401.94+480940.1. J Astrophys Astron 43, 25 (2022). https://doi.org/10.1007/s12036-022-09814-x

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  • DOI: https://doi.org/10.1007/s12036-022-09814-x

Keywords

  • Surveys
  • galaxies: active
  • galaxies: jets
  • radio-loud galaxies: photometry
  • galaxies: Seyfert
  • gamma-rays: galaxies