The Jet Kinematics of FSRQ 1928+738 Kunwoo Lee, Jongho Park, Sascha - - PowerPoint PPT Presentation

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The Jet Kinematics of FSRQ 1928+738 Kunwoo Lee, Jongho Park, Sascha - - PowerPoint PPT Presentation

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The Jet Kinematics of FSRQ 1928+738 Kunwoo Lee, Jongho Park, Sascha Trippe Seoul National University Basic Info of FSRQ 1928+738 MOJAVE 15 GHz Common Name : 4C +73.18 z ~ 0.302 Flat Spectrum Radio Quasar S 43 > 3 Jy

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SLIDE 1

The Jet Kinematics of FSRQ 1928+738

Kunwoo Lee, Jongho Park, Sascha Trippe

Seoul National University

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SLIDE 2
  • Common Name : 4C +73.18
  • z ~ 0.302
  • Flat Spectrum Radio Quasar
  • Known to have large viewing angle

~13 deg (e.g. Hovatta 2009)

Basic Info of FSRQ 1928+738

S43>3Jy M BH∼10

8.57 M sol

http://www.physics.purdue.edu/astro/MOJAVE /sourcepages/1928+738.shtml

MOJAVE 15 GHz

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SLIDE 3

Jet Bending

Lister & Homan (2005) Roland et al (2015) One of the major bending sources ! One of the binary SMBH candidates!

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SLIDE 4

KaVA Monitoring

(2017.02 ~ )

  • KaVA 43GHz Intensity Map
  • KaVA 43GHz UV plane
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SLIDE 5
  • KaVA 43GHz Intensity Map
  • Core a : innermost region
  • Core b : recollimation shock

(& Knot A)

  • Knot B : downstream jet component
  • Knot C : downstream jet component
  • Knot D : downstream jet component

1mas = 4.4pc

τ∼1

KaVA Monitoring

5 Jet regions

(2017.02 ~ )

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SLIDE 6

stationary surface →jet ejection region → new ejection soon? τ∼1

KaVA Result – Core a

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SLIDE 7

The brightest region →knot, passing through a recollimation shock

KaVA Result – Core b & Knot A

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SLIDE 8

The brightest region →knot, passing through a recollimation shock

KaVA Result – Core b & Knot A

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SLIDE 9

The brightest region →knot, passing through a recollimation shock

KaVA Result – Core b & Knot A

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SLIDE 10

2nd brightest component →recently passed the recollimation shock

KaVA Result – Knot B

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SLIDE 11

The weakest region →knot lost most of its energy → seems natural

KaVA Result – Knot C

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SLIDE 12

2nd weakest region → Doppler boosted !! → bending towards LOS SD=δD

3 Sintr D≿SC=δC 3 Sintr C

KaVA Result – Knot D

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SLIDE 13

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

Main Results – (1) Apparent Velocity

Separation from core [mas]

βapp= βsinθ (1−βcosθ)

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SLIDE 14

βapp= βsinθ (1−βcosθ) δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

Main Results – (1) Apparent Velocity

βappincreasesasa functionof distance!! why ? decreasingθ? ? →Deriveδ!!

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SLIDE 15

c x (flux decay time in obs frame) = c x (shrank light travel time)

  • = (physical size of knot)

δvar= sDL c Δtdecay(1+z)

Jorstad et al. (05, 17)

Main Results – (2) Doppler factor

Ex) Knot B

c Δtobs=c(1+z)Δtintr δ sD L (1+z)

2=c Δ tintr

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SLIDE 16

Main Results – (2) Doppler factor

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

τdecay=1.3×τrising

Valtaoja et al (1999)

Separation from core [mas] Separation from core [mas]

δvar= sDL c Δtvar(1+z)

βapp= βsinθ (1−βcosθ)

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SLIDE 17

Main Results – (2) Doppler factor

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

Separation from core [mas] Separation from core [mas]

βapp,δvarincreasesasa functionof distance!!

βapp= βsinθ (1−βcosθ)

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SLIDE 18

Main Results – (3) Viewing angle

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ

θvar=arctan 2βapp βapp

2 +δ 2−1

Separation from core [mas]

βapp,δvarincreases asa functionof distance!!

~13deg (H09)

θo decreases as a functionof distance !! βapp= βsinθ (1−βcosθ)

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SLIDE 19

Main Results – (3) Viewing angle

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ

θvar=arctan 2βapp βapp

2 +δ 2−1

LOS

Separation from core [mas]

βapp= βsinθ (1−βcosθ)

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SLIDE 20

Main Results – (4) Lorentz factor

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ

θvar=arctan 2βapp βapp

2 +δ 2−1

βapp= βsinθ (1−βcosθ)

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SLIDE 21

Main Results – (4) Lorentz factor

βapp= βsinθ (1−βcosθ)

Bending towards LOS Accelerating

Not only bending, but also accelerating !!

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SLIDE 22

Under collimation !! θ∝ 1 Γ

sl=R(separation) st=R×sin(|PA−PA|)+r θproj=arctan( st sl )

Main Results – (5) Half Opening angle

θopdecreases as afunction of distance !!

tanθop=tanθprojsin θo

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SLIDE 23

Discussion – Acceleration & Collimation

  • Jet structure transits, Parabolic jet (being collimated) → Conical jet (ballistic)

Asada & Nakamura (2012), Nakamura & Asada (2013), Algaba+ (2017), Hada+ (2018)

Accelerating & Collimating at (0~5 mas)! KaVA 43GHz Magnetically dominated parabolic jet with bulk acceleration → conical jet with slow deceleration Potter & Cotter (2013) Decelerating at (~10 mas)?? KaVA 22GHz

Observation (M87+) Theory

z∼10

6 Rs(HST−1,M 87)

z∼10

6∼8 Rs(S ,1 H 0323+342)

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SLIDE 24

Summary of the Jet Kinematics

The jet of 1928+738 is bending, moreover, bending towards our line of sight !!

  • The jet of 1928+738 is accelerating & being collimated !!

(at 0 ~ 5 mas region)

  • → Excellent laboratory for studying ‘Acceleration’ & ‘Collimation’ & ‘Bending’
  • How about outer regions?

(at ~ 10 mas region) → further study with KaVA 22GHz

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SLIDE 25

Thank you

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SLIDE 26

βapp= βcosθ (1−βcosθ) δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ

LOS

Separation from core [mas]

Discussion – Acceleration & Collimation

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SLIDE 27

Discussion – Acceleration & Collimation

Accelerating & Collimating at (0~5 mas)! KaVA 43GHz Magnetically dominated parabolic jet with bulk acceleration → conical jet with slow deceleration Potter & Cotter (2013) Decelerating at (~10 mas)?? KaVA 22GHz

Observation (M87+) Theory

z∼10

6 Rs(HST−1,M 87)

z∼10

6∼8 Rs(S ,1 H 0323+342)

  • Jet structure transits, Parabolic jet (being collimated) → Conical jet (ballistic)

Asada & Nakamura (2012), Nakamura & Asada (2013), Algaba+ (2017), Hada+ (2018)

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SLIDE 28

Discussion – Acceleration & Collimation

Accelerating & Collimating at (0~5 mas)! KaVA 43GHz Magnetically dominated parabolic jet with bulk acceleration → conical jet with slow deceleration Potter & Cotter (2013) Decelerating at (~10 mas)?? KaVA 22GHz

Observation (M87+) Theory

z∼10

6 Rs(HST−1,M 87)

z∼10

6∼8 Rs(S ,1 H 0323+342)

  • Jet structure transits, Parabolic jet (being collimated) → Conical jet (ballistic)

Asada & Nakamura (2012), Nakamura & Asada (2013), Algaba+ (2017), Hada+ (2018)

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SLIDE 29

Summary of the Jet Kinematics

1928+738 is bending, moreover, towards our line of sight !!

  • 1928+738 is accelerating & being collimated !!

(at 0 ~ 5 mas region)

  • How about outer regions?

(at ~ 10 mas region) → further study with KaVA 22GHz

  • How about inner regions?

(at

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SLIDE 30

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

Discussion – Position Angle

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SLIDE 31

Discussion – Outlier?

Accretion rate – Variability timescale

log(tintr)=1.88→3.15

  • Not a true outlier ?
  • It seems to be

a fundamental relation

Park & Trippe (2017)

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SLIDE 32

Summary

  • 1928+738 is not a true outlier of

‘accretion rate – variability timescale’ relation

  • 1928+738 is bending,

moreover, towards our line of sight !!

  • 1928+738 is accelerating & collimating !!

(at 0 ~ 5 mas region)

  • How about outer regions?

(at ~ 10 mas region) → further study

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SLIDE 33

δ= 1 γ(1−βcosθ) γvar=βapp

2 +δ 2+1

2δ θvar=arctan 2βapp βapp

2 +δ 2−1

Main Results – (6) Position angle