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      https://www.ias.ac.in/article/fulltext/joaa/043/0009

    • Keywords

       

      Active galaxies; BL Lacertae objects; PG 1553 $+$ 113.

    • Abstract

       

      We study flux and spectral variability of the high energy peaked TeV blazar PG 1553 $+$ 113 on diverse timescales using the data collected from 2005 to 2019 which also includes the intensive intra-night monitoring of the target. Additionally, we recorded the brightest flare of the blazar PG 1553 $+$ 113 during April 2019 when the source attained an $R$-band magnitude of 13.2. Analyzing the spectral evolution of the source during the flare gave a clockwise spectral hysteresis loop and a time lag with $V$-band variations leading to the $R$-band ones. Various statistical tests, fitting procedures and cross-correlation techniques are applied to search for periodicity and examine the color-magnitude relationship. We find a median period of ($2.21 \pm 0.04$) years along with the secondary period of about 210 days. Finally, we briefly discuss variousphysical mechanisms which are capable of explaining our findings.

    • Author Affiliations

       

      ADITI AGARWAL1 B. MIHOV2 I. ANDRUCHOW3 4 SERGIO A. CELLONE4 5 G. C. ANUPAMA6 V. AGRAWAL7 S. ZOLA8 9 AYKUT OZDONMEZ10 ERGUN EGE11

      1. Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bengaluru 560080, India.
      2. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Blvd., 1784 Sofia, Bulgaria.
      3. Instituto de Astrofı´sica de La Plata (CCT La Plata-CONICET-UNLP), La Plata, Argentina.
      4. Facultad de Ciencias Astrono´micas y Geofı´sicas, Universidad Nacional de La Plata, Paseo del Bosque, B1900FWA La Plata, Argentina.
      5. Complejo Astrono´mico ‘‘El Leoncito’’ (CASLEO), CONICET-UNLP-UNC-UNSJ, San Juan, Argentina.
      6. Indian Institute of Astrophysics, Block II, Koramangala, Bangalore 560034, India.
      7. Twilio, RMZ Ecoworld, Bellandur, Bangalore 560103, India.
      8. Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland.
      9. Mt. Suhora Observatory, Pedagogical University, ul. Podchorazych 2, 30-084 Krakow, Poland.
      10. Department of Astronomy and Space Science, Faculty of Science, Ataturk University, Yakutiye, Erzurum, Turkey.
      11. Department of Astronomy and Space Sciences, Faculty of Science, Istanbul University, 34116 Beyazıt, Istanbul, Turkey.
    • Dates

       
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      Posted on January 27, 2016

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