-
- Home
- Journals
- Journal of Astrophysics and Astronomy
-
A. NATARAJAN
Articles written in Journal of Astrophysics and Astronomy
-
-
Volume 43 All articles Published: 3 August 2022 Article ID 0048
Intra-night optical variability monitoring of $\gamma$-ray emitting blazars
K. SUBBU ULAGANATHA PANDIAN A. NATARAJAN C. S. STALIN ASHWANI PANDEY S. MUNEER B. NATARAJAN
We present the results obtained from our campaign to characterize the intra-night optical variability properties of blazars detected by the
Fermi large area telescope. This involves R-band monitoring observations of a sample of 18 blazars, which includes five flat spectrum radio quasars (FSRQs) and thirteen BL Lac objects (BL Lacs) covering the redshift range $z=0.085$-1.184. Our observations carried out using the 1.3m J. C. Bhattacharya telescope cover a total of 40 nights ($\sim$200 h) between the period December 2016 and March 2020. We characterized variability using the power enhanced $F$-test. We found duty cycle (DC) variability of about 11% for FSRQs and 12% for BL Lacs. Dividing the sample into different sub-classes based on the position of the synchrotron peak in their broadband spectral energy distribution (SED), we found DC of $\sim$16%, $\sim$10% and $\sim$7% for lowsynchrotron peaked (LSP), intermediate synchrotron peaked (ISP) and high synchrotron peaked (HSP) blazars. Such high DC of variability in LSP blazars could be understood in the context of the R-band tracing the falling part (contributed by high energy electrons) of the synchrotron component of thebroadband SED. Also, the R-band tracing the rising synchrotron part (produced by low energy electrons) in the case of ISP and HSP blazars, could cause lesser variability in them. Thus, the observed high DC of variability in LSP blazars relative to ISP and HSP blazars is in accordance with the leptonic model ofemission from blazar jets.
-
-
Journal of Astrophysics and Astronomy
Volume 44, 2023
All articles
Continuous Article Publishing mode
-
Journal of Astrophysics and Astronomy | News
-
Continuous Article Publication
Posted on January 27, 2016Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.
-
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
-