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

Ojha, Vineet

doi:10.1007/s12036-022-09814-x

J Astrophys Astron

2022

DOI: 10.1007/s12036-022-09814-x

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

Vineet Ojha

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Cited by 2 publications

References 88 publications

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Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies

Ojha

Jha

Chand

et al. 2022

Monthly Notices of the Royal Astronomical Society

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To quantify the role of radio jets for Intra-Night Optical Variability (INOV) in Radio-Loud Narrow-Line Seyfert 1 (RLNLSy1) galaxies, we report the first systematic comparative INOV study of 23 RLNLSy1 galaxies, with 15 RLNLSy1s having confirmed detection of jets (jetted) and the remaining 8 RLNLSy1s having no detection of jets (non-jetted) based on their Very Long Baseline Array observations. We have monitored these two samples, respectively, in 37 and 16 sessions of a minimum 3-hour duration each. Based upon Fη-test at 99% confidence level with a typical INOV amplitude (ψ) detection threshold of > 3%, we find the INOV duty cycles of 12% for the sample of jetted RLNLSy1s, however, none of the sources showed INOV in the sample of non-jetted RLNLSy1s. Among the jetted RLNLSy1s, we find that the Duty Cycle (DC) for jetted γ-ray detected (γ-ray) RLNLSy1s is found to be 34% in contrast to null INOV detection in the case of non-γ-ray RLNLSy1s. It suggests that instead of the mere presence of a jet, relativistic beaming plays a significant role for INOV in the case of low-luminous high accreting AGNs such as NLSy1s in which dilution of the AGN’s non-thermal optical emission by the (much steadier) optical emission contributed by the nuclear accretion disc is quite likely. Our study of jetted γ-ray RLNLSy1s shows more frequent INOV detection for sources with higher apparent jet speed. Further, our results also suggest that among the NLSy1s, only jetted γ-ray RNLSy1 galaxies DC approaches blazar like DC.

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Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies

Ojha

Jha

Chand

et al. 2022

Monthly Notices of the Royal Astronomical Society

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4K × 4K CCD Imager for the 3.6 m DOT: Recent Up-gradations and Results

Pandey¹,

Kumar²,

Reddy³

et al. 2023

J. Astron. Instrum.

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The 4K × 4K CCD Imager is the first light instrument for the 3.6[Formula: see text]m Devasthal Optical Telescope and is producing broad-band imaging observations of many Galactic and extra-galactic sources since 2015–2016. Capabilities of the CCD Imager are demonstrated recently through several publications using the well-calibrated multi-band deep photometric results as expected from other similar facilities globally. In this paper, we summarize some of the recent up-gradations made to improve the Imager, i.e. mounting the new filter wheel casing, replacing stray light baffles and discussing the fringe pattern corrections in redder filters. Some of the new science initiatives like galaxy-embedded faint point sources including WR stars and the observations of low surface brightness galaxy clusters are also discussed.

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

Cited by 2 publications

References 88 publications

Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies

Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies

4K × 4K CCD Imager for the 3.6 m DOT: Recent Up-gradations and Results

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