Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey

被引：1

作者：

Zhang, Tianfang ^{[1
,2
,3
]}

Doi, Mamoru ^{[2
,3
,4
]}

Kokubo, Mitsuru ^{[3
]}

Sako, Shigeyuki ^{[2
,5
,6
]}

Ohsawa, Ryou ^{[3
]}

Tominaga, Nozomu ^{[3
,7
,8
]}

Tanaka, Masaomi ^{[9
,10
]}

Fukazawa, Yasushi ^{[11
]}

Takahashi, Hidenori ^{[12
]}

Arima, Noriaki ^{[2
]}

Kobayashi, Naoto ^{[12
]}

Arimatsu, Ko ^{[13
]}

Okumura, Shin-ichiro ^{[14
]}

Kondo, Sohei ^{[12
]}

Kasuga, Toshihiro ^{[3
]}

Mori, Yuki ^{[12
]}

Niino, Yuu ^{[12
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Astron, 7-3-1,Hongo, Bunkyo City, Tokyo 1138654, Japan

[2] Univ Tokyo, Inst Astron, Grad Sch Sci, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan

[3] Natl Inst Nat Sci, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[4] Univ Tokyo, Res Ctr Early Universe, Sch Sci Bldg 4,7-3-1 Hongo, Mitaka, Tokyo 1130033, Japan

[5] Univ Tokyo, UTokyo Org Planetary Space Sci, 7-3-1 Hongo, Bunkyo City, Tokyo 1138654, Japan

[6] Univ Tokyo, Collaborat Res Org Space Sci & Technol, 7-3-1 Hongo, Bunkyo City, Tokyo 1138654, Japan

[7] SOKENDAI, Grad Inst Adv Studies, Astron Sci Program, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[8] Konan Univ, Fac Sci & Engn, Dept Phys, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan

[9] Tohoku Univ, Astron Inst, Sendai 9808578, Japan

[10] Tohoku Univ, Div Estab Frontier Sci Org Adv Studies, Sendai 9808577, Japan

[11] Hiroshima Univ, Dept Phys, 1-3-1 Kagamiyama, Higashihiroshima 7398526, Japan

[12] Univ Tokyo, Inst Astron, Grad Sch Sci, Kiso Observ, Mitake 10762-30,Kiso Machi, Mitake, Nagano 3970101, Japan

[13] Kyoto Univ, Hakubi Ctr Astron Observ, Grad Sch Sci, Sakyo Ku, Kyoto 6068502, Japan

[14] Bisei Spaceguard Ctr, Japan Spaceguard Assoc, 1716-3 Okura, Ibara, Okayama 7141411, Japan

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 968卷 / 02期

基金：

日本学术振兴会; 美国国家航空航天局; 美国国家科学基金会;

关键词：

BL LACERTAE OBJECTS; X-RAY; RELATIVISTIC JETS; RADIO; QUASARS; SPECTRA; CATALOG;

D O I：

10.3847/1538-4357/ad4292

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We studied the optical variability of 241 BL Lacertae (BL Lacs) and 83 flat-spectrum radio quasars (FSRQs) from the 4LAC catalog using data from the Tomo-e Gozen Northern Sky Transient Survey, with similar to 50 epochs per blazar on average. We excluded blazars whose optical variability may be underestimated due to the influence of their host galaxy based on their optical luminosity (L O ). FSRQs with gamma-ray photon index greater than 2.6 exhibit very low optical variability, and their distribution of standard deviation of repeated photometry is significantly different from that of the other FSRQs (Kolmogorov-Smirnov test p-value equal to 5 x 10-6). Among a sample of blazars at any particular cosmological epoch, those with lower gamma-ray luminosity (L gamma ) tend to have lower optical variability, and those FSRQs with a gamma-ray photon index greater than 2.6 tend to have low L gamma . We also measured the structure function of optical variability and found that the amplitude of the structure function for FSRQs is higher than previously measured and higher than that of BL Lacs at multiple time lags. Additionally, the amplitude of the structure function of FSRQs with high gamma-ray photon index is significantly lower than that of FSRQs with low gamma-ray photon index. The structure function of FSRQs of high gamma-ray photon index shows a characteristic timescale of more than 10 days, which may be the variability timescale of the accretion disk. In summary, we infer that the optical component of FSRQs with high gamma-ray photon index may be dominated by the accretion disk.

引用

页数：13

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