- NuStar
- Explorer class
- PI-led
- Will have guest investigator program
- First focusing telescope in high-energy X-ray band
- 100x improvement in 3-79 keV
- Previous telescopes: detector was larger than collecting area of telescope
- ~18" resolution, 12.5' fov
- Our CMZ: Multicolor cmz vs INTEGRAL
- NUstar FOV = Integral resolution
- Survey Muno field (CMZ surey covering negative longitudes)
- Sgr A*
- Flares show it obviously
- ~1hr/day
- detection of flare at >10 keV
- Gamma ray pulse in Galactic Center
- enhanced X-ray emission
- pulsations detected
- 3.7 second pulsations
- 3" distant magnetar: SGR J1745-29
- Associated with disk of massive stars near Sgr A*?
- HESS J1640-465
- being observed right now
- TeV source
- possible evidence from NuStar for a pulsar
- Nearby Starburst Galaxies
- Observations coordinated with Chandra
- NGC 253, Arp 299, M82, NGC 3310, NGC 3256
- AGN may only be visible at high energies b/c of absorption at lower energies
- sampling range in mass, sfr
- NGC 253
- Lehmer et al 2013
- Where is the nucleus? Crowded core, hard to determine
- Chandra obscured X-ray source "off-center" compared to Radio
- dynamical center determined; Chandra sees one source near it + variability driven by that source + nustar spectrum by assuming all variability associated with it + classical ULX source: binary star + BH + Either IMBH or super-eddington accretion
- nuclear emission overestimated due to ULXs
- Arp 299
- Only "B" nucleus visible at high X-ray energies
- Only one nucleus currently active
Questions:
- Farhad: Will Nu-Star look at gamma-ray bubble?
- A: Two problems: 1. too extended, too much time, can't contribute much
- Is there a possibility of other magnetars not yet detected?
- A: Various types of magnetars. Undetectable in quiescence. Difficult to constrain overall population. Raises questions: unlikely by chance; do we not understand magnetar population
- What is the diffuse emission detected with INTEGRAL? In Sgr E?
- A: We don't see hard x-ray emission coincident with INTEGRAL source. Centroid of INTEGRAL source offset from diffuse emission