Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Multiband optical flux density and polarization microvariability study of optically bright blazars. / Pasierb, Magdalena; Goyal, Arti; Ostrowski, Michał; Stawarz, Łukasz; Wiita, Paul J.; Gopal-Krishna, ; Larionov, Valeri M.; Morozova, Daria A.; Itoh, Ryosuke; Alicavus, Fahri; Erdem, Ahmet; Joshi, Santosh; Zola, Staszek; Borman, Georgy A.; Grishina, Tatiana S.; Kopatskaya, Evgenia N.; Larionova, Elena G.; Savchenko, Sergey S.; Nikiforova, Anna A.; Troitskaya, Yulia V.; Troitsky, Ivan S.; Akitaya, Hiroshi; Kawabata, Miho; Nakaoka, Tatsuya.
в: Monthly Notices of the Royal Astronomical Society, Том 492, № 1, 02.2020, стр. 1295-1317.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Multiband optical flux density and polarization microvariability study of optically bright blazars
AU - Pasierb, Magdalena
AU - Goyal, Arti
AU - Ostrowski, Michał
AU - Stawarz, Łukasz
AU - Wiita, Paul J.
AU - Gopal-Krishna,
AU - Larionov, Valeri M.
AU - Morozova, Daria A.
AU - Itoh, Ryosuke
AU - Alicavus, Fahri
AU - Erdem, Ahmet
AU - Joshi, Santosh
AU - Zola, Staszek
AU - Borman, Georgy A.
AU - Grishina, Tatiana S.
AU - Kopatskaya, Evgenia N.
AU - Larionova, Elena G.
AU - Savchenko, Sergey S.
AU - Nikiforova, Anna A.
AU - Troitskaya, Yulia V.
AU - Troitsky, Ivan S.
AU - Akitaya, Hiroshi
AU - Kawabata, Miho
AU - Nakaoka, Tatsuya
PY - 2020/2
Y1 - 2020/2
N2 - We present the results of flux density, spectral index, and polarization intra-night monitoring studies of a sample of eight optically bright blazars, carried out by employing several small to moderate aperture (0.4 to 1.5 m diameter) telescopes fitted with CCDs and polarimeters located in Europe, India, and Japan. The duty cycle of flux variability for the targets is found to be ˜45 per cent, similar to that reported in earlier studies. The computed two-point spectral indices are found to be between 0.65 to 1.87 for our sample, comprised of low- and intermediate-frequency peaked blazars, with one exception: they are also found to be statistically variable for about half the instances where `confirmed' variability is detected in flux density. In the analysis of the spectral evolution of the targets on hourly time-scale, a counterclockwise loop (soft-lagging) is noted in the flux-spectral index plane on two occasions, and in one case a clear spectral flattening with the decreasing flux is observed. In our data set, we also observe a variety of flux-polarization degree variability patterns, including instances with a relatively straightforward anticorrelation, correlation, or counterclockwise looping. These changes are typically reflected in the flux-polarization angle plane: the anticorrelation between the flux and polarization degree is accompanied by an anticorrelation between the polarization angle and flux, while the counterclockwise flux-PD looping behaviour is accompanied by a clockwise looping in the flux-polarization angle representation. We discuss our findings in the framework of the internal shock scenario for blazar sources.
AB - We present the results of flux density, spectral index, and polarization intra-night monitoring studies of a sample of eight optically bright blazars, carried out by employing several small to moderate aperture (0.4 to 1.5 m diameter) telescopes fitted with CCDs and polarimeters located in Europe, India, and Japan. The duty cycle of flux variability for the targets is found to be ˜45 per cent, similar to that reported in earlier studies. The computed two-point spectral indices are found to be between 0.65 to 1.87 for our sample, comprised of low- and intermediate-frequency peaked blazars, with one exception: they are also found to be statistically variable for about half the instances where `confirmed' variability is detected in flux density. In the analysis of the spectral evolution of the targets on hourly time-scale, a counterclockwise loop (soft-lagging) is noted in the flux-spectral index plane on two occasions, and in one case a clear spectral flattening with the decreasing flux is observed. In our data set, we also observe a variety of flux-polarization degree variability patterns, including instances with a relatively straightforward anticorrelation, correlation, or counterclockwise looping. These changes are typically reflected in the flux-polarization angle plane: the anticorrelation between the flux and polarization degree is accompanied by an anticorrelation between the polarization angle and flux, while the counterclockwise flux-PD looping behaviour is accompanied by a clockwise looping in the flux-polarization angle representation. We discuss our findings in the framework of the internal shock scenario for blazar sources.
KW - polarization
KW - radiation mechanisms: non-thermal
KW - galaxies: active
KW - galaxies: individual: 0109+224
KW - 3C 66A
KW - S5 0716+714
KW - OJ 287
KW - 3C 279
KW - PG 1553 + 113
KW - CTA 102
KW - and 3C 454.3
KW - galaxies: jets
KW - RELATIVISTIC JETS
KW - TIME-SCALES
KW - VARIABILITY PROPERTIES
KW - LIGHT CURVES
KW - SHOCKS
KW - RADIO-LOUD
KW - PARTICLE-ACCELERATION
KW - ACTIVE GALACTIC NUCLEI
KW - galaxies: individual: 0109+224, 3C 66A, S5 0716+714, OJ 287, 3C 279, PG 1553+113, CTA102, and 3C 454.3
KW - Polarization
KW - 3C 454.3
KW - Galaxies: individual: 0109+224
KW - Radiation mechanisms: non-thermal
KW - Galaxies: jets
KW - PG 1553+113
KW - Galaxies: active
UR - https://www.mendeley.com/catalogue/79beea09-81a3-32fb-adee-999e3723ba8f/
U2 - 10.1093/mnras/stz3533
DO - 10.1093/mnras/stz3533
M3 - Article
VL - 492
SP - 1295
EP - 1317
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -
ID: 51140852