Big and young SMBHs in the early Universe: the case of B2 1023+25

Talk at the 40th COSPAR Scientific Assembly (COSPAR14), held in Moscow (Russia)

Transcript

1. Big and young SMBHs in the early Universe: the case of B2 1023+25 Tullia Sbarrato COSPAR, August 8th 2014 In collaboration with: M. Balokovic, G. Ghisellini, P. Giommi, F.A. Harrison, G. Madejski, M. Nardini, M. Perri, S. Puccetti, G. Tagliaferri
2. Outline • high-redshift blazars as SMBHs tracers ➡ pros & cons • systematic search • B2 1023+25: blazar identification • results COSPAR, August 8th 2014
3. : jet beaming angle viewing angle: blazars: our viewing angle is smaller than the jet beaming angle analogous jetted AGN, randomly oriented: Blazars as SMBHs tracers COSPAR, August 8th 2014
4. • each blazar counts for ~350-450 radio-loud AGN not aligned! • clues on the relation between jet and SMBH formation • very few blazars at z > 4: all serendipitous ✓systematic search finding extremely massive SMBHs at high redshift constraints on SMBH formation models! Blazars as SMBHs tracers COSPAR, August 8th 2014
5. Why only serendipitous? most powerful high redshift most massive SMBH COSPAR, August 8th 2014
6. Why only serendipitous? most powerful high redshift most massive SMBH COSPAR, August 8th 2014
7. Why only serendipitous? most powerful high redshift most massive SMBH COSPAR, August 8th 2014
8. most powerful Why only serendipitous? X-ray data! high redshift most massive SMBH COSPAR, August 8th 2014
9. most powerful Why only serendipitous? high redshift most massive SMBH COSPAR, August 8th 2014 “naked” disc
10. most powerful Why only serendipitous? high redshift most massive SMBH COSPAR, August 8th 2014 “naked” disc ✓can be found in large optical catalogs ✓ MBH can be estimated by fitting the “naked” accretion disc!
11. SDSS DR7 - z>4: 1248 - radio-detected: 53 - R>100: 31 GROND - visible from La Silla: 19 Sbarrato et al. 2013a Systematic approach COSPAR, August 8th 2014
12. SDSS DR7 - z>4: 1248 - radio-detected: 53 - R>100: 31 GROND - visible from La Silla: 19 } Sbarrato et al. 2013a Systematic approach 19 high-z, extremely radio-loud blazar candidates COSPAR, August 8th 2014
13. Sbarrato et al. 2012; Sbarrato et al. 2013b B2 1023+25 Best blazar candidate: COSPAR, August 8th 2014
14. Sbarrato et al. 2012; Sbarrato et al. 2013b B2 1023+25 Best blazar candidate: NuSTAR and Swift/XRT: strong and hard X-ray flux FX [5 − 10keV] = 5.5 × 10−14erg cm−2s−1 ΓX = 1.60+0.27 −0.26 COSPAR, August 8th 2014
15. B2 1023+25 traces at least ~1540 analogous misaligned quasars How many SMBHs does it trace? • B2 1023+25 is seen with viewing angle smaller than the jet beaming angle 2Γ2 338 } • SDSS+FIRST cover ~8770 square degrees, i.e. 1/4 of the whole sky COSPAR, August 8th 2014
16. High masses at high redshift! COSPAR, August 8th 2014
17. High masses at high redshift! COSPAR, August 8th 2014
18. High masses at high redshift! COSPAR, August 8th 2014
19. • blazars are the perfect objects to look for extremely massive BHs at high z • high-z radio-loud broad line quasars are good high-z blazar candidates • NuSTAR data map well the first part of the high-energy component: allow to classify a blazar at z>4! • with few blazar identifications, we can put strong constraints on the density of SMBHs in jetted systems at very large redshift Conclusions COSPAR, August 8th 2014
20. Sbarrato et al. 2013b B2 1023+25 FX [5 − 10keV] = 5.5 × 10−14erg cm−2s−1 ΓX = 1.60+0.27 −0.26 COSPAR, August 8th 2014