2018
DOI: 10.1093/mnras/sty3288
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Abstract: For 3 radio-loud γ-ray detected Narrow-Line Seyfert 1 (γ-ray NLSy1) galaxies, we report optical variability on intra-night and/or week-like time scales, based on five 3 hours long monitoring sessions for each galaxy. The radio-loudness factors (R 1.4GHz ) 1 for these galaxies, namely 1H 0323+342 (z = 0.0629), PKS J1222+0413 (z = 0.966) and PKS J1505+0326 (z = 0.408) are ∼318, ∼1534 and ∼3364 at 1.4 GHz, respectively. For the most distant γ-ray NLSy1, PKS J1222+0413, Intra-Night Optical Variability (INOV) chara… Show more

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Cited by 22 publications
(30 citation statements)
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References 188 publications
(255 reference statements)
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“…Other studies at infrared/optical wavelengths [18,[269][270][271][272][273][274][275][276][277][278][279] and at X-rays [254,280,281] have been done.…”
Section: Sample Study Surveysmentioning
confidence: 99%
“…Other studies at infrared/optical wavelengths [18,[269][270][271][272][273][274][275][276][277][278][279] and at X-rays [254,280,281] have been done.…”
Section: Sample Study Surveysmentioning
confidence: 99%
“…Such sharp variations are quite uncommon even in case of γ-ray detected NLSy1s (e.g., see Eggen et al, 2013;Maune et al, 2014;Ojha et al, 2019) and extremely rare for blazars (e.g., see Gopal-Krishna & Wiita, 2018, and reference theirin). The high redshift nature of this source (z = 0.49) implying high intrinsic luminosity capable to swamp the host galaxy allowed us to assert that there is almost no contribution from its host galaxy to our chosen aperture for photometry and most of its optical emissions are due to synchrotron and accretion disc (e.g., see Ojha et al, 2019). Now, if we estimate the flux doubling time on our conservative assumption, that equal contributions i.e.…”
Section: Resultsmentioning
confidence: 99%
“…In addition to the criterion of FWHM(Hβ), two extreme optical characteristics such as relatively weak [O III ] and strong permitted Fe ii emission lines with [O III ] λ5007 /Hβ < 3 are used to define the NLSy1 galaxy (Shuder & Osterbrock, 1981). Moreover, NLSy1 galaxies (NLSy1s) also display other utmost observational characteristics such as steep soft X-ray spectra, rapid X-ray (in optical sometimes) flux variability, strong soft X-ray excess below 2 keV, and blue-shifted line profile (e.g., Brandt et al, 1997;Leighly, 1999;Vaughan et al, 1999;Komossa & Meerschweinchen, 2000;Miller et al, 2000;Zamanov et al, 2002;Klimek et al, 2004;Leighly & Moore, 2004;Boroson, 2005;Liu et al, 2010;Paliya et al, 2013a;Kshama et al, 2017;Ojha et al, 2019Ojha et al, , 2020b. It is believed that NLSy1s are young active galactic nuclei (AGNs) and represents an earlier stage in their evolution (e.g., Mathur, 2000;Sulentic et al, 2000;Mathur et al, 2001;Fraix-Burnet et al, 2017;Komossa, 2018;Paliya, 2019).…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Optical intraday variability has been reported for PMN J0948+0022 [124][125][126][127], SBS 0846+513 [128,129], PKS 1502+036 [127], and 1H 0323+342 [130,131] 7 . On the other hand, no intraday variability has been observed in optical for PKS 1502+036 [131].…”
Section: Infrared and Optical Propertiesmentioning
confidence: 99%