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LOFAR + Gaia (+ X-ray) Transients

transientskp
January 09, 2014

LOFAR + Gaia (+ X-ray) Transients

Peter Jonker

transientskp

January 09, 2014
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  1. LOFAR + Gaia (+ X-ray?) transients
    Peter Jonker (SRON, RU, CfA)
    co-coordinator of multiwave/messenger follow-up
    LOFAR TKP meeting Amsterdam Jan. 8-10, 2014

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  2. Transients with expected radio emission
    Jonker, O’Brien et al. ArXiv 1306.2336
    Absolute peak magnitude MV
    Peak X-ray luminosity (erg s-1)
    1E-2 1 1E2 1E4 1E6
    Time scale (seconds)
    1E50
    1E45
    1E40
    1E35
    SN Ia break out
    Flare stars
    X-ray flashes & sub-luminous
    ϒ-ray bursts
    SN IIbc break out
    Classical novae
    -10
    -15
    -20
    -5
    Classical novae
    SN Ia
    SGR Giant flares
    SGR
    intermediate
    flares
    -25
    ϒ-ray bursts
    1E55
    .Ia explosions
    ϒ-ray bursts
    Tidal disruption

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  3. Gaia scan
    Gaia focal plane
    ~billion pixels...
    Slide adapted from Berry Holl

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  4. Gaia timescales
    Slide adapted from Berry Holl

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  5. Gaia timescales
    Number  of  epochs  in  5  yr:  40-­‐240    
    Mean  #:  72

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  6. Gaia first light image!

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  7. Gaia: when transients?
    launch
    20 December 2013
    Jan Feb Mar Apr May Jun Jul Aug
    2014
    Reach
    L2
    Ecliptic
    Poles
    Scan
    Nominal
    Scan
    Verification phase
    alerts released
    Sep Oct
    STH/LW 29.10.2013
    Nov
    2013
    Commissioning
    figure from Simon Hodgkin

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  8. Gaia scans
    courtesy Simon Hodgkin

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  9. Gaia
    105 106 107 108 109
    black hole mass (M¯
    )
    10-2
    10-1
    100
    101
    102
    103
    detection rate (yr¡1 )
    Alerts for Gaia-detected galaxies: ¢m <¡0:3, G <20
    TDE
    SN Ia
    nuclear SN Ia
    AGN flares
    simulation Sjoert van Velzen

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  10. LOFAR tracking Gaia
    One single observation can not allocate the full

    bandwidth in sub-bands, ~16 MHz “left” to track
    Gaia
    LOFAR LBA bandwidth 10-80 MHz

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  11. LOFAR / GAIA simultaneous observations?

    1 degree/min slew compares well with

    LOFAR FOV
    Gehrels PI Swift: 1 month test

    ~10% of Swift time to observe

    simultaneous with Gaia
    XMM (TOO or DDT) follow-up of transients

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  12. XRT000519
    Case study: A new fast X-ray transient
    Jonker, Glennie et al. 2013

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  13. 0 5000 10000 15000 20000 25000
    Time (sec)
    10 3
    10 2
    10 1
    100
    0.1-7 keV rate; counts s 1)
    Precursors to the transient
    ~4000 s
    ~4000 s

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  14. Transient #2 – 3rd January 2011
    Glennie et al. to be submitted

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  15. Transient #3 – 30th August 2012

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  16. Mi′ = −6.7 for a Distance Modulus of 31 for M 86
    Transient: archival optical images
    INT 999s i’-band; 2001-3-22
    i’=24.3
    CFHT 2055s i’-band; 2009-5-14/15
    i’>25.6

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  17. 0 50 100 150 200
    Time (sec)
    10 1
    100
    101
    0.1-7 keV rate; counts s 1)
    Interpretations: peak luminosity?
    LEdd?
    Fpeak (0.5-10 keV)=2x10-10 erg cm-2 s-1
    dM86=16.2 Mpc

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  18. What is causing the transient: TDE?
    Rosswog, Ramirez-Ruiz, Hix 2009

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  19. Conclusion:
    #
    Strange Transient
    potentially an IMBH disrupting a WD
    #
    One needs multi-wavelength
    observations
    to successfully classify such events

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