1st results from cross-matching

with X-ray data

George Seabroke

Talk Outline

• Travel money acknowledgement• Why X-match RAVE with X-ray data?• X-ray-optical X-match literature review• Who’s actually X-matching RAVE with X-ray data?• X-match Results • Conclusions

Department of Physics & AstronomyDepartment of Physics & Astronomy Planetary & Space Sciences Research InstitutePlanetary & Space Sciences Research Institute

The Open University

Department of Earth & Environmental SciencesDepartment of Earth & Environmental Sciences

Department of Physics & AstronomyDepartment of Physics & Astronomy Planetary & Space Sciences Research InstitutePlanetary & Space Sciences Research Institute

The Open University

Department of Earth & Environmental SciencesDepartment of Earth & Environmental Sciences

CEPSAR Interdisciplinary

Project(£1000!)

Department of Physics & AstronomyDepartment of Physics & Astronomy

Academics: Academics:

•Ulrich KolbUlrich Kolb

•Andrew Norton Andrew Norton Postdoc:Postdoc: Robin Barnard Robin Barnard

Planetary & Space Sciences Research InstitutePlanetary & Space Sciences Research Institute

Academics: Academics: • Andrew HollandAndrew Holland

Postdoc:Postdoc:• George SeabrokeGeorge Seabroke

The Open University

CEPSAR Interdisciplinary

Project(£1000!)

Why cross-match RAVE with X-ray data?• Physics of stellar X-ray emission not understood but linked to stellar

properties• Stellar X-ray activity identifies interesting, rare stars– Cataclysmic variables– White dwarfs etc

• Stellar X-ray activity identifies youngest stars– Currently no RAVE stellar age diagnostic– Probes large-scale distribution of young stars

• Moving groups• Gould disc

•

Guillout et al. (1998)

X-ray-optical X-match literature review

• Guillout et al. (1999) X-matched ROSAT All-Sky Survey (RASS, pre-release: 150,000) with:– Hipparcos (6200 out of 118,200 = 5.25%)– Tycho (13,875 out of 106 = 1.39%)

• Agueros et al. (2009) X-matched RASS (public release: 125,000) with– SDSS DR1 (709 out of 53 million = 0.001%)

Who’s actually cross-matching RAVE with X-ray

data?

Duncan Fyfe (Leicester)

Helped write XMM-Newton data reduction pipeline i.e X-ray expert!

X-match Results X-ray catalogue Reference Search

radius (arcsec)

No of RAVE stars

No of X-ray sources

%

2nd XMM Serendipitous Survey

Watson et al. (2009) 5 269 191,870 0.14

XMM Slew Survey Saxton et al. (2008) 5 73 4710 1.55

ROSAT Faint Source Catalogue

Voges et al. (2000) 50 1215 105,924 1.15

ROSAT Bright Source Catalogue

Voges et al. (1999) 50 647 18,806 3.44

Conclusions

• Deadline for next CEPSAR Interdisciplinary Projects (for £1000 again) Wed 17th June– In addition to asking for travel £ for next RAVE meeting based

on continuing OU X-ray collaboration, shall I aslo include investigation of RAVE CCD upgrade to e2v HiRho CCD?

• XRAVE catalogue plans– X-match RAVE with Chandra serendipitous catalogue as well– Validate X-match quality– Use most accurate distances (Breddels et al. 2009 using stellar

models vs Klement et al. 2008 using Tycho-2 B & V?) to calculate X-ray luminosity

– Make internal X-match available internally to collaboration? – Make DR3 X-match publically available via VizieR & publicize

with paper inc 1st X-ray RAVE science (TBD: LMC & SMC X-ray sources)?