Revisit LSI +61 303 with VLBA Yuanwei Wu (NTSC) G. - - PowerPoint PPT Presentation

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revisit lsi 61 303 with vlba
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Revisit LSI +61 303 with VLBA Yuanwei Wu (NTSC) G. - - PowerPoint PPT Presentation

Apr 10, 2024 146 likes •388 views

Revisit LSI +61 303 with VLBA Yuanwei Wu (NTSC) G. Torricelli-Ciamponi (INAF); M. Massi(MPIfR); M.J. Reid (CfA); B. Zhang (SHAO); L. Shao (MPIfR); X. W. Zheng (NJU) YongPyong/EAVW

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SLIDE 1

Revisit LSI +61 303 with VLBA

Yuanwei Wu (NTSC)

  • G. Torricelli-Ciamponi (INAF); M. Massi(MPIfR); M.J. Reid (CfA);
  • B. Zhang (SHAO); L. Shao (MPIfR); X. W. Zheng (NJU)

YongPyong/EAVW 2018-09-07

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SLIDE 2

Outline

  • Background of LSI +61 303
  • VLBA Observations
  • Results

➢ proper motion & 3D motions ➢ Precession period ➢ Jet geometry

  • Future Plan
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SLIDE 3

Background of LSI +61 303

  • Binary: Be star (B0) + compact object

Microquasar or Pulsar wind D ~ 2 kpc

  • X-ray, γ-ray (>400 GeV)

1 of 3 known star systems produce Very High Energy gamma rays

  • Periodic light curve at optical, radio, X-ray, γ-ray
  • 722 papers, 542 from 1998 to 2018
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SLIDE 4

Background of LSI+61303

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SLIDE 5

Background of LSI +61 303

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SLIDE 6

Background of LSI +61 303

  • V. Dhawan; A. Mioduszewski & M. Rupen 2006
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SLIDE 7

Background of LSI +61 303

Casares J. et al. 2005

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SLIDE 8

Background of LSI +61 303

Albert J. et al. 2006

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SLIDE 9

Background of LSI +61 303

  • M. Massi & Torricelli-Ciamponi G. 2014

Light cureve data ~ 6 yr P1 = 26.49 +- 0.07 day P2 = 26.92 +- 0.07 day P3 = 1628 +- 48 day

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SLIDE 10

Background of LSI +61 303

  • M. Massi & Torricelli-Ciamponi G. 2016

P1 = 26.49 +- 0.07 day P2 = 26.92 +- 0.07 day P3 = 1628 +- 48 day

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SLIDE 11

Background of LSI +61 303

  • M. Masssi et al. 2012 M. Massi & G. Torricelli-Ciamponi 2014
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SLIDE 12

VLBA Observations

  • 10-epoch phase reference observations

2015Jul15 --- 2015 Aug23

  • frequency setup same as 2006 observations

8.4 GHz, 4IFs,16 MHz per IF, dual polarization

  • combine with 2006 observations

There are 20 epoch data with time span of 9 year

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SLIDE 13

Results: jet images

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SLIDE 14

Results: precession ellipse

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SLIDE 15

Results: proper motions and 3D motion

  • Proper motion
  • Distance 2.0 ± 0.3 kpc (Aragona et al. 2009)

VLSR = 41.4 ± 10 km s

  • 3D motion

Our results GAIA results The very low peculiar motion is a strong evidence that the compact object is a black hole.

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SLIDE 16

Results: precession period

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SLIDE 17

Results: precession period

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SLIDE 18

Results: geometry of the jet

x', y' is the orbit plane x'', y' is the plane ┴ l.o.s B is the jet base BC is the jet axis

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SLIDE 19

Results: geometry of the jet

Normal of the Orbit is same to the precession axis AG = 25 deg (Nagae et al. 2006) MAW = MOW = DAW=DBW = w = 230 deg Jet open angle = 6 deg, CG = 21 deg Jet open angle = 5 deg, CG = 20 deg for SS 433 x', y' is the orbit plane x'', y' is the plane ┴ l.o.s B is the jet base BC is the jet axis

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SLIDE 20

Results: geometry of the jet

Modeling the jet projection versus observations

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SLIDE 21

Results: geometry of the jet

Model of jet angle various with time

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SLIDE 22

Future Plan

  • LSI + 61 303 a good lab for study jet physics
  • the core shift at high frequency will be much smaller,

multi-epoch monitoring of the jet at higher frequency, its possible to separate precession and orbit motion

  • High resolution multi-band jet data will yield

properties of jet plasma (density & temperature), that can improve the model of radiation transfer, and the geometry of the radio jet