Why are some BL Lacertaes detected by Fermi, but others not?

Zhongzu Wu; Dongrong Jiang; Minfeng Gu; Liang Chen

doi:10.1051/0004-6361/201220851

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Volume 562 (February 2014)

A&A, 562 (2014) A64

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Table 2

KS test for the variation effects on Fermi and non-Fermi BL Lacs.

Mode

δ

F _core

KS statistic

Probability

Significantly different

KS statistic

Probability

Significantly different

F120^a

0.446

8,0e-08

YES

0.459

2.9e-08

YES

F150^a

0.413

8.7e-07

YES

0.459

2.9e-08

YES

F200^a

0.353

4.5e-05

YES

0.481

4.5e-09

YES

F120^b

0.441

1.1e-07

YES

0.459

2.9e-08

YES

F150^b

0.414

7.9e-07

YES

0.443

9.6e-08

YES

F200^b

0.373

1.3e-05

YES

0.441

1.1e-07

YES

L120^a

0.450

6.0e-08

YES

0.471

1.0e-08

YES

L150^a

0.441

1.1e-07

YES

0.451

5.0e-08

YES

L200^a

0.433

2.0e-07

YES

0.470

1.1e-08

YES

L120^b

0.453

4.5e-08

YES

0.467

1.4e-08

YES

L150^b

0.443

9.6e-08

YES

0.467

1.4e-08

YES

L200^b

0.391

3.8e-06

YES

0.456

3.6e-08

YES

R120^a

0.470

1.1e-08

YES

0.467

1.4e-08

YES

R150^a

0.477

6.4e-09

YES

0.487

2.8e-09

YES

R200^a

0.453

4.5e-08

YES

0.487

2.8e-09

YES

R120^b

0.449

6.2e-08

YES

0.471

1.0e-08

YES

R150^b

0.436

1.7e-07

YES

0.461

2.9e-08

YES

R200^b

0.401

1.9e-06

YES

0.464

1.8e-08

YES

Notes. Notes: F120, F150, and F200 − a subsample of sources with the highest radio core flux, are assumed to be in an elevated state with radio core flux at 120%, 150%, and 200% of the quiescent state, respectively; L120, L150, and L200: a subsample of sources with the highest radio core luminosity assumed to be in an elevated state with radio core luminosity at 120%, 150%, and 200% of the quiescent state, respectively; R120, R150, and R200: a subample of random sources assumed to be in an elevated state of 120%, 150%, and 200% of the quiescent state, respectively.

^(a)

and

^(b)

indicate that the subsample size are 30% and 50% of the whole sample, respectively.

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