Main scientific resultsobtained with RTT150 at IKI. Ground support of SRG space observatory.

1. Main scientific resultsobtained with RTT150 at IKI. Ground support of SRG space observatory. Rodion Burenin, IKI RAN

2. Current scientific programs: • X-ray selected galaxy clusters - 400d survey • Optical identifications of INTEGRAL hard X-ray sources • Fast photometry of BH, NS and WD in X-ray binaries • Gamma-ray bursts afterglows • More . . .

3. 400d galaxy cluster survey Clusters are detected in X-rays and then identified in optical with RTT150 ROSAT 0.5-2 keV image clusters point sources RTT150, R band, cluster at z=0.7

4. 400d galaxy cluster survey • The largest catalog of distant massive clusters • The volume at 0.3<z<0.1 is comparable to that of Abell catalog in local Universe • RTT150 is the main telescope used for direct imaging in the North http://hea.iki.rssi.ru/400d/ Burenin et al. 2007, ApJS

5. Chandra Cluster Cosmology Project (CCCP) 86 massive galaxy clusters, more than 1.5 Msec of Chandra observations

6. Dark energy constraints Accuracy of dark energy constraints from our cluster data is comparable to those from WMAP, SNIa and BAO Vikhlinin et al. 2009a,b ApJ

7. Dark energy constraints The most accurate measurement of the parameter of Dark Energy equation of state to date! Vikhlinin et al. 2009a,b ApJ (~160 citations in ADS during the first year after publication, more than 200 citations currently)

8. INTEGRAL All Sky Survey Optical identifications of newly discovered INTEGRAL sources: 29 new INTEGRAL sources are identified with RTT150 Among them 20 out of ~100 AGNs in INTEGRAL All Sky Survey Bikmaev et al., 2006a,b, AstL Sazonov et al., 2008, A&A Burenin et al., 2008, AstL Bikmaev et al., 2009, AstL Burenin et al., 2009, AstL, ...

9. Fast photometry: SS433 Power spectrum of the accretion disk variability Revnivtsev et al. 2004, A&A Revnivtsev et al. 2006. A&A Burenin et al., 2010, AstL, accepted

10. Fast photometry: Cataclysmic Variables Trancated inner parts of the acctretion disks are observed as breakes in power spectra Revnivtsev et al., 2010, A&A

11. Fast photometry: new fast EM CCD Crab pulsar, 33ms period Time resolution up to 300 fps, nearly zero effective readout noise.

12. Fast photometry: New fast EM CCD, First results Example: Power spectrum of LS Peg polar shows additional noise component at approximately 1 Hz, which can be interpreted as the variability of the flux from WD polar cap.

13. Gamma ray bursts afterglows GRB 030329, Burenin et al., 2003 The most extensively studied GRB afterglow at >10 year time scale! More: 71 GRB atferglows, 97 GCN Circulars, 8 refereed papers, details: http://hea.iki.rssi.ru/grb/

14. Deep optical photometric coverage of ultradeep Galactic Chandra Field Dark dusty clouds Fields of low IS extinction CHANDRA FOV 1 Msec of Chandra observations (PI M. Revnivtsev) Revnivtsev et al., 2010a,b, AstL, ApJ see also: Revnivtsev et al., 2010, Nature

15. Details at IKI web page http://hea.iki.rssi.ru/rtt150/en/ Reference to the current status of our publications in ADS

16. Bibliography • 2001 - 2010: • Publications with co-authors from IKI: • 37 refereed papers • 97 GCN circulars • 16 Astronomy telegrams • 708 references in ADS (Aug 2010)

17. Future: Optical identification of X-ray sources from the SRG All Sky Survey with RTT150

18. Spectrum Roengen Gamma (SRG) • All sky survey in 0.1-10 keV • 100000 galaxy clusters, all massive clusters in Universe • 3000000 AGNs • LMXB, HMXB, CV, chromospherically active stars, etc. A large amount of optical followup observations will be required ART-XC eROSITA Launch in 2012

19. Digital Sky Survey • all sky • photo plates • mlim  20 • blue, red, IR

20. Sloan Digital Sky Survey • 10000 square degrees • CCD • mlim 22 • u'g'r'i'z'

21. Pan-Starrs, PS1 • 1.8-m, 9 sq.d. telescope • 70% of all sky in a week • mlim 25 • grizY PS4 is delayed now

22. Large Synoptic Survey Telescope • 8.4-m, 9.6 sq.d. field telescope • whole sky in 3 days • ugrizY • down to r=28

23. What can be done with RTT150? Initial selection of the samples of various objects should be made using the data of wide field imaging surveys. With ground based telescopes we will mostly need to obtain spectroscopic identifications and redshift measurements. Few examples: ...

24. Galaxy clusters Clusters are identified in X-rays as extended sources

25. Galaxy clusters, photometric redshifts ... are not very good for high precision cosmology.

26. Galaxy clusters, redshift distribution Only ~3000 clusters in massive clusters subsample remain. Redshifts for half of them (z<~0.4) can be effectively measured with RTT150 — very significant and valuable contribution in Dark Energy studies based on SRG All Sky Survey.

27. Active galactic nuclei The majority of faint point sources — AGNs. ~3000000 AGNs in SRG All-Sky Survey!

28. Active galactic nuclei • Optical spectroscopy of well defined subsamples will be required: • Obscured AGNs in local Universe • Type 2 QSO at high redshift • High redshift QSO

29. Active galactic nuclei Selection with Art-XC in hard X-rays: Obscured AGNs --

30. High redshift quasars SDSS, Fan et al., 1999 ~100 high redshift QSO at z=~6 in SRG All-Sky Survey. RTT have a chance to discover the most luminous QSOs in Universe!

31. Cataclysmic Variables • In SRG survey an unbiased sample of ~1000 CV will be discovered, including large amount of faint compact systems. • Tests of stellar evolution models • SN Ia • Gravitational waves SDSS — ~100 CV (Gansicke et al., 2009)

32. X-ray binaries SRG survey of the Galactic Plane --- completely unexplored range of XRB luminosities!

33. Conclusions • The observations with RTT150 telescope currently allow to obtain very interesting scientific results in different fields. • RTT150 will provide very important and valuable ground support for SRG All-Sky X-ray Survey. • Therefore, RTT150 should be considered as highly successful project with very exciting perspectives. Our existing collaboration should be continued in future.