LOFAR + Gaia (+ X-ray) Transients

Peter Jonker

Transcript

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
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
3. Gaia scan Gaia focal plane ~billion pixels... Slide adapted from Berry Holl
4. Gaia timescales Slide adapted from Berry Holl
5. Gaia timescales Number  of  epochs  in  5  yr:  40-­‐240     Mean  #:  72
6. Gaia first light image!
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
8. Gaia scans courtesy Simon Hodgkin
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
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
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
12. XRT000519 Case study: A new fast X-ray transient Jonker, Glennie et al. 2013
13. M86 SDSS
14. 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
15. Transient #2 – 3rd January 2011 Glennie et al. to be submitted
16. Transient #3 – 30th August 2012
17. 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
18. 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
19. What is causing the transient: TDE? Rosswog, Ramirez-Ruiz, Hix 2009
20. Conclusion: # Strange Transient potentially an IMBH disrupting a WD # One needs multi-wavelength observations to successfully classify such events