two topics in x-ray astronomy with xeus- microquasars and stellar flares
DESCRIPTION
TWO TOPICS IN X-RAY ASTRONOMY WITH XEUS- microquasars and stellar flares. HESA, Observatory Univ Helsinki. Grs1915 binary. shooting. Mirabel et al. Flip-flop. Relativistic Iron line. - PowerPoint PPT PresentationTRANSCRIPT
xeus-science October 2004/ O. Vilhu
TWO TOPICS IN X-RAY ASTRONOMY WITH XEUS- microquasars and stellar flares
HESA, Observatory Univ Helsinki
xeus-science October 2004/ O. Vilhu
Grs1915 binary
xeus-science October 2004/ O. Vilhu
Mirabel et al. shooting
xeus-science October 2004/ O. Vilhu
Flip-flop
xeus-science October 2004/ O. Vilhu
Relativistic Iron line
• is a most intresting high gravity probe when the inner disc is closest to the BH and the corona (reflection component) just touches the inner disc = high soft state
• The blue horn is sharp but does it require calorimeter resolving power ?
• gives a baseline for AGN’s
xeus-science October 2004/ O. Vilhu
NARROW LINES IN GRS1915+105
xeus-science October 2004/ O. Vilhu
ASTRO-E2 50 KSEC (simulation)
lines from CHANDRA observation (Lee et al.), variable within 10 ksec
xeus-science October 2004/ O. Vilhu
ORIGIN OF LINES ? Outflow, disk wind, origin of jet formation
xeus-science October 2004/ O. Vilhu
BUT here is a problem:BRIGHT GALACTIC ONE CRAB SIZE SOURCES (e.g.
grs1915,gx339,cygx-3, transients) HAVE HIGH XEUS COUNT RATES 10 4 - 10 5 CPS.
HENCE, NEED TO
1. USE A MOVABLE FILTER TO CUT LOW ENERGIES or
2. DEVELOPE FAST COUNTING CAPABILITY or
3. OBSERVE FAINTER SOURCES IN OTHER GALAXIES, LIKE ULX’s and LMC sources and
4. OBSERVE HIGHLY ABSORBED NEW INTEGRAL IGR SOURCES and use bright microquasars as a guide
xeus-science October 2004/ O. Vilhu
RHESSI IMAGE 1ARCSEC = 700 KM
XSM/SMART-1 1.5 HOUR DYNAMICAL SPECTRUM
ENERGY (keV)
TIME
Fe K EW < 1 KEV
Solar flare May 2004Huovelin Alha Väänänen
0 20
xeus-science October 2004/ O. Vilhu
Fe K : sensitive for log(n) > 16 cm-3
• Sigma2CrB ASTRO-E2 simu 20 ksec
forbidden line
xeus-science October 2004/ O. Vilhu
MgXI and OVII CHANDRAactive stars 100 ksec
Testa et al astroPH-0405018
log(n) > 10.5
log(n) > 12.7MgXI
OVII
forbidden line
xeus-science October 2004/ O. Vilhu
XEUS/XSM-estimate, active star at 10 pc:
• at max xeus-counts/16 sec = 1.e5 * (1.5e13/2e19)**2 (10m2/1mm2) * 10000. = 0.025*1e5 = 2500
xeus-science October 2004/ O. Vilhu
XEUS/CHANDRA-estimate
XEUS exposure time for MgXI and OVII of closeby active stars:
100 ksec * (10 – 200 cm2)/10 m2 = 0.1 ksec
OK for flares !