A. Zezas (PI; UoC/SAO) SMC XVP Collaboration: P. Plucinsky; SMC XVP Collaboration: C. Badenes; B. Blair; R. Di Stefano; J. Drake; A. Foster; T. Gaetz;

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A. Zezas (PI; UoC/SAO) SMC XVP Collaboration: P. Plucinsky; SMC XVP Collaboration: C. Badenes; B. Blair; R. Di Stefano; J. Drake; A. Foster; T. Gaetz; F. Haberl; J. Hong; V. Kalogera; K. Kuntz; S. Laycock; T. Linden; K. Long; S. Mineo; P. Plucinsky; M. Sasaki; R. Smith; S. Snowden; R. Sturm; B. Williams; F. Winkler; N. Wright 14 th HEAD meeting, Chicago, August 2014 SMC A DEEP CHANDRA SURVEY OF ONE OF THE NEAREST STAR-FORMING LOW-METALLICITY GALAXIES: FIRST RESULTS VALLIA ANTONIOU SMITHSONIAN ASTROPHYSICAL OBSERVATORY

(Credit: NOAO/AURA/NSF, MCELS Team, F. Winkler/Middlebury College) N E THE SMALL MAGELLANIC CLOUD WING BAR 14 th HEAD meeting, Chicago, August 2014 Hα [SII] [OIII]

14 th HEAD meeting, Chicago, August 2014 WHY OBSERVE THE SMALL MAGELLANIC CLOUD? * proximity (2 nd nearest star-forming ~60 kpc) * low interstellar absorption (N H ~ 6 x cm -2 ) * resolved stellar populations (young <100 Myr, intermediate ~500 Myr, old ~ few Gyr) * “clean” X-ray source populations (almost entirely HMXBs & SNRs) 10x smaller than LMC;100x smaller than MW * small angular size (compared to the Galactic Plane; 10x smaller than LMC;100x smaller than MW) * has been extensively studied in ALL wavelengths over the years allowing us to obtain a very good picture of its properties

WHY OBSERVE THE SMALL MAGELLANIC CLOUD? * Probe very faint populations 14 th HEAD meeting, Chicago, August 2014

© Stephane Guisard EARLIER SHALLOW X-RAY SURVEYS OF THE SMC EN FIELD 3 FIELD 5 FIELD 6 FIELD 7 FIELD 4 FIELD 2 FIELD 6 FIELD 1 FIELD 5 FIELD 3 30 arcmin Chandra observations XMM-Newton observations ~10 ks each ~10 ks each Lx ~ 4 x erg s -1 Lx ~ 4 x erg s -1 ( keV) ( keV) (e.g., Antoniou+ 2009) ~20-30 ks each ~20-30 ks each Lx ~ erg s -1 ( keV) Lx ~ erg s -1 ( keV) (e.g., Antoniou+ 2010, Haberl+ 2012) ~ sources in each survey ~ sources in each survey 47 Tuc 14 th HEAD meeting, Chicago, August 2014

WHY OBSERVE THE SMALL MAGELLANIC CLOUD? * Probe very faint populations * Large populations of HMXBs Be-XRBs: most numerous sub-class (NS + Oe/Be) population associated with recent SF population associated with recent SF Charles & Seward (1995) 14 th HEAD meeting, Chicago, August 2014

THE X-RAY PULSAR POPULATION OF THE SMC 68 known to date…with the exception of 2 systems, all known pulsars are Be-XRBs 68 known to date …with the exception of 2 systems, all known pulsars are Be-XRBs SMC X-1; SG-XRB SXP8.02;AXP HI map (Stanimirovic et al. 1999) 14 th HEAD meeting, Chicago, August 2014

WHY OBSERVE THE SMALL MAGELLANIC CLOUD? * Probe very faint populations * Large populations of HMXBs Be-XRBs: most numerous sub-class (NS + Oe/Be) Be-XRBs: most numerous sub-class (NS + Oe/Be) population associated with recent SF population associated with recent SF SFR, age & duration of burst * Well known SF parameters (SFR, age & duration of burst) 14 th HEAD meeting, Chicago, August 2014

Harris & Zaritsky (2004) pixel intensity proportional to the SFR STAR-FORMATION HISTORY OF THE SMC 14 th HEAD meeting, Chicago, August 2014

WHY OBSERVE THE SMALL MAGELLANIC CLOUD? * Probe very faint populations * Large populations of HMXBs Be-XRBs: most numerous sub-class (NS + Oe/Be) population associated with recent SF population associated with recent SF SFR, age & duration of burst * Well known SF parameters (SFR, age & duration of burst) Unique environment to understand accreting binary evolution channels in low metallicities (Z SMC ~1/5 Z  ) XRBs formation efficiency Physics of accretion Physical parameters affecting the formation & evolution of young XRBs 14 th HEAD meeting, Chicago, August 2014

Antoniou et al. (2010) Average SFH of regions in the SMC w/ and w/o young XRBs (using data from Harris & Zaritsky 2004) SFR [10 -6 Mo/yr/arcmin 2 ] log (age [yr]) ~40 Myr CONNECTING XRB s WITH THEIR PARENT STELLAR POPULATIONS 14 th HEAD meeting, Chicago, August 2014

Antoniou et al. (2010) HMXB FORMATION EFFICIENCY IN THE SMC First direct calibration of the HMXB formation efficiency at 40 Myr: ~ 1 HMXB per 3 x Mo/yr at 40 Myr: ~ 1 HMXB per 3 x Mo/yr Be-XRBs HMXBs 14 th HEAD meeting, Chicago, August 2014

TOWARDS A MORE COMPLETE UNDERSTANDING OF HMXB s Cycle 14 XVP Program (1.1 Ms) A comprehensive survey of sources brighter than ~few x erg/s in 11 fields in the SMC representing young (<100 Myr) populations of different ages GOALS ✦ ✦ A deep census of accreting pulsars ✦ HMXB formation efficiency at different ages ✦ Short/long term variability of accreting binaries ✦ Detailed studies of SNRs ✦ Stars at low metallicity ≤10 Myr 6-15 Myr Myr Myr Myr SNRs 14 th HEAD meeting, Chicago, August 2014

THE DEEP CHANDRA SURVEY  survey completed (Dec 2012 – Feb 2014)   11 fields (each 2 x 50ks) + 3 archival fields with similar exposure times 14 th HEAD meeting, Chicago, August 2014

Cycle 14 XVP Program (1.1 Ms) ✦ ✦ 11 fields (each 2 x 50ks) + 3 fields from the archive with similar exposure times ✦ survey just completed (Dec 2012 – Feb 2014) FIRST RESULTS ✦ 60 – 80 srcs per field ✦ Limiting Lx ~ 5 x erg/s ≤10 Myr 6-15 Myr Myr Myr Myr SNRs THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014

THE DEEP CHANDRA SURVEY: FIRST RESULTS Using the MCPS optical photometric survey (Zaritsky et al. 2002): ~100 HMXBs candidates down to Lx ~ 5 x erg/s 14 th HEAD meeting, Chicago, August 2014

THE DEEP CHANDRA SURVEY: FIRST RESULTS HMXBs XLF  Flat slope:  ~0.2 / 0.8  Evidence for break  consistent with accretion in an inhomogeneous environment & the onset of the propeller effect (c.f. Shtykovskiy & Gilfanov 2004)  Deepest XLF ever recorded for a galaxy! slope~0.2 slope~0.8 Lx,break ~ 3x10 34 erg/s 14 th HEAD meeting, Chicago, August 2014

Cycle 14 XVP Program (1.1 Ms) ✦ ✦ 11 fields (each 2 x 50ks) + 3 fields from the archive with similar exposure times ✦ survey just completed (Dec 2012 – Feb 2014) FIRST RESULTS ✦ 60 – 80 srcs per field ✦ Limiting Lx ~ 5 x erg/s ✦ 2 new pulsars (from the analysis of epoch 1 only) ≤10 Myr 6-15 Myr Myr Myr Myr SNRs THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014

THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014 Period (s)

Cycle 14 XVP Program (1.1 Ms) ✦ ✦ 11 fields (each 2 x 50ks) + 3 fields from the archive with similar exposure times ✦ survey just completed (Dec 2012 – Feb 2014) FIRST RESULTS ✦ 60 – 80 srcs per field ✦ Limiting Lx ~ 5 x erg/s ✦ 2 new pulsars (from the analysis of epoch 1 only) ✦ 8 SNRs ≤10 Myr 6-15 Myr Myr Myr Myr SNRs THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014

THE DEEP CHANDRA SURVEY: AN SNR GALLERY 14 th HEAD meeting, Chicago, August 2014

DF11 DF02A < 10 Myr 20 – 70 Myr THE DEEP CHANDRA SURVEY: AN SNR GALLERY 14 th HEAD meeting, Chicago, August 2014

Cycle 14 XVP Program (1.1 Ms) ✦ ✦ 11 fields (each 2 x 50ks) + 3 fields from the archive with similar exposure times ✦ survey just completed (Dec 2012 – Feb 2014) FIRST RESULTS ✦ 60 – 80 srcs per field ✦ Limiting Lx ~ 5 x erg/s ✦ 2 new pulsars (from the analysis of epoch 1 only) ✦ 8 SNRs ✦ HMXB formation efficiency ≤10 Myr 6-15 Myr Myr Myr Myr SNRs THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014

HMXB Formation Efficiency as a function of age Peak at ~ 40 – 60 Myr N(HMXBs) / N(OB stars) THE DEEP CHANDRA SURVEY: FIRST RESULTS 14 th HEAD meeting, Chicago, August 2014

Very promising first results Lx ~ 5 x erg/s Measure XLF down to Lx ~ 5 x erg/s Evidence for changes in formation efficiency of HMXBs with age Evidence for changes in formation efficiency of HMXBs with age What’s next?  Follow-up spectroscopically the identified optical counterparts  Characterize the sources  Investigate differences in XLFs as a function of age  Extend this work to other galaxies… THE DEEP CHANDRA SURVEY: SUMMARY & FUTURE PLANS 14 th HEAD meeting, Chicago, August 2014