High Energy Astrophysics with the Fermi Large Area Telescope Elizabeth Hays (NASA/GSFC) On behalf of the Fermi LAT Collaboration.

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Presentation transcript:

High Energy Astrophysics with the Fermi Large Area Telescope Elizabeth Hays (NASA/GSFC) On behalf of the Fermi LAT Collaboration

E. HaysJuly 27, 2009 Fermi LAT Collaboration France IN2P3, CEA/Saclay Italy INFN, ASI, INAF Japan Hiroshima University ISAS/JAXA RIKEN Tokyo Institute of Technology Sweden Royal Institute of Technology (KTH) Stockholm University United States Stanford University (SLAC and HEPL/Physics) University of California at Santa Cruz - Santa Cruz Institute for Particle Physics Goddard Space Flight Center Naval Research Laboratory Sonoma State University Ohio State University University of Washington Principal Investigator: Peter Michelson (Stanford University) ~390 Scientific Members (including 96 Affiliated Scientists, plus 68 Postdocs and 105 Students) Managed at SLAC

E. HaysJuly 27, 2009 Large Area Telescope (LAT)  e+e+ e-e- Tracker Si strip detectors Tungsten foil converters pitch = 228 um 8.8x10 5 channels 18 planes Calorimeter CsI crystals hodoscopic array 6.1x10 3 channels 8 layers ACD scintillator 89 tiles Large Field of View >2.4 sr Broad Energy Range 20 MeV - >300 GeV

E. HaysJuly 27, 2009 LAT Performance Energy dependence of PSF. 68% containment <0.5 deg above 1 GeV Energy dependence of effective area. Peaks above 1 GeV A GeV, wide-field instrument Dependence of effective area on inclination angle (10 GeV). ~50% efficiency at 50 deg. PSF dependence on inclination angle (10 GeV). Resolution maintained to >50 deg. 1 GeV50 deg

E. HaysJuly 27, 2009 LAT Sensitivity with Time All sky coverage in ~3 hrs (2 orbits) Minor asymmetry due to passages through South Atlantic Anomaly Transient Science: Flares, bursts, multiwavelength campaigns, unidentified transients Accumulated Science: New source types, populations, long- term monitoring, spatially extended and diffuse studies Deepest and most uniform survey of the sky at these energies

E. HaysJuly 27, 2009 Fermi LAT 9-Month Skymap Full sky in Galactic Coordinates

E. HaysJuly 27, 2009 Extragalactic Highlights From 3 Month survey Abdo et al. 2009, ApJS, 183, 46 Abdo et al. 2009, ApJ, 700, 597  First 3 Months  206 bright sources (>10  )  1/3 variable  106 spatially associated with active galactic nuclei (AGN)  2 radio galaxies

E. HaysJuly 27, 2009 Blazar Galaxies 3C daily flux Aug-Oct 2008 Abdo et al. 2009, ApJ, 699, 817  Looking down relativistic particle jets from galaxy cores  Extremely variable  Broadband emission from radio to gamma- ray wavelengths

E. HaysJuly 27, 2009 LAT Detection of Perseus A  NGC 1275 = Perseus A = 3C84  In galaxy cluster at D~75 Mpc  No previous detection with EGRET  Consistent with a point source  Long-term variability Abdo et al. 2009, ApJ, 699, 31 First new LAT radio galaxy COS B EGRET LAT

E. HaysJuly 27, 2009 Galactic Highlights Unidentifieds ? Pulsars (47+) X-ray Binaries And nebulae Supernova Remnants

E. HaysJuly 27, 2009 Vela Pulsar 100 MeV -> 10 GeV Abdo et al. 2009, ApJ Accurate LAT timestamps plus accurate radio timing solutions Magnetic field lines Rotation Axis Radio beam ~20 km

E. HaysJuly 27, 2009 Gamma-ray Pulsar Discoveries  Pre-LAT: 1 radio-quiet gamma-ray- loud pulsar detected with EGRET  Blind search for periodicity at known locations of interest ~4 months of data ~100 “interesting” locations ~200 unidentified LAT sources Time-differencing technique applies FFT to time differences not event times (Atwood et al. 2006, Ziegler et al. 2008) Saves in trials and computation  NEW: 13 of 16 radio-quiet LAT pulsars associated with unidentified EGRET sources Credit: Yadigaroglu & Romani

E. HaysJuly 27, 2009 New Gamma-ray Pulsars Appeared in Science Express July 2

E. HaysJuly 27, 2009 Crab Pulsar and Nebula Inverse Compton emission consistent with mean magnetic field in nebula 100 µG < B < 200 µG Nebula from MeV to TeV Pulsar 100 MeV to 20 GeV Hyper-exponential cutoff excluded at ~5 sigma Consistent with emission well above the neutron star surface

E. HaysJuly 27, 2009 LAT Resolves a Nearby Galaxy Adaptively smoothed LAT count map with dust map contours from infrared observations Background Blazar 30 Doradus  D~50 kpc (~180 kly)  Active star forming regions, massive stars and supernova remnants LAT resolves galaxy plus a source consistent with 30 Doradus (Tarantula nebula, HII region) 50% from 30 Doradus 50% from LMC Large Magellanic Cloud Preliminary 100 MeV - 10 GeV

E. HaysJuly 27, 2009 Diffuse Emission from the Galaxy LAT and EGRET measurements dominated by systematics EGRET GeV excess not confirmed by LAT for intermediate latitudes Model based on local cosmic-ray measurements (pre-Fermi) in good agreement Preliminary LAT/EGRET comparisonLAT/CR Model comparison EGRET LAT Preliminary

E. HaysJuly 27, 2009 LAT as an Electron Detector  ~100% efficient for E>20 GeV  Good hadron rejection (up to 1:10^4 at 1 TeV)  Detailed simulations and comparisons with data  Systematics <20% MC-data, acceptance, proton spectrum, energy calibration Selection criteria example <20% over energy range <2%

E. HaysJuly 27, 2009 Cosmic-ray e + +e - spectrum from 20 GeV to 1 TeV Abdo et al. 2009, Physical Review Letters, 102,  LAT error band includes systematics  Model assumes standard CR injection and propagation Energy Resolution

E. HaysJuly 27, 2009 Fermi Gamma-ray Bursts 9 LAT GRBs (2x pre-Fermi for E>100 MeV) 2 short GRBs detected by LAT

E. HaysJuly 27, 2009 GRB C keV to GeV Lightcurve LAT All LAT >100 MeV LAT >1 GeV BGO 260 keV - 5 MeV NaI 8 keV keV Abdo et al. 2009, Science, 323, 1688

E. HaysJuly 27, 2009 GRB C Spectral Evolution Spectrum for (b) s compatible with a single component Rapid soft to hard evolution in (a) to (b) Gradual decrease of Epeak from (b) to (d) NaI BGO LAT Abdo et al. 2009, Science, 323, 1688

E. HaysJuly 27, 2009 Implications of High Redshift Pulsar (Kaaret 99) GRB (Ellis 06/07) GRB (Boggs 04) AGN (Biller 99) AGN (Aharonian 08) min M QG (GeV) GRB080916CPlanck mass AGN (Albert 08) E iso ~8.3 x ergs Largest energy release ever observed High redshift and high fluence imply strongly collimated jet No cutoff => bulk Lorentz factor >890±21 Also constrain Lorentz invariance violation 13.2 T s M QG > 1.3 x GeV/c 2 Z = / (GROND)

E. HaysJuly 27, 2009 Summary LAT is an excellent gamma-ray (and electron) detector Explaining previously unidentified gamma-ray emitters Monitoring the entire gamma-ray sky, catching flares from blazars and gamma-ray bursts - some very far away! Detecting new pulsars and probing the emission zones and mechanisms Measuring diffuse gamma-ray emission from the Galaxy and beyond Exploring new territory - more science to come! First year of science Aug data release soon! First Fermi Symposium Nov 2-5, Washington, D.C.