Fermi LAT
–= Gruppo 2 =–
Denis Bastieri
Sara Buson
Giovanna Pivato
Riccardo Rando
Luigi Tibaldo
g
Fermi Gamma-Ray Space Telescope
TKR
ACD
e- e+
CAL
Pair production g-ray telescope
detects photon energy and direction
between ~ 20 MeV and more than 300 GeV
3 years skymap
g-ray astronomy
Steady
sources and
transients
Cosmic rays
Dark Matter
New Physics (LIV, axions …)
Inter-galactic magnetic fields, opacity of the Universe
2012-07-09
D. Bastieri - INFN Gruppo II
2
4 years in orbit – June 11 2012
over 1.37 billion LAT events to the FSSC
1949 transients from GBM (939 GRB)
199 LAT collaboration papers (Cat I and Cat II) - been cited nearly 10,000 times
800 refereed papers with new Fermi results or using/interpreting Fermi results and
issued
over 30 press/web releases.
3
2012-07-09
D. Bastieri - INFN Gruppo II
Fermi observatory status
 No performance degradation
– 0.06% TKR channels disabled (880k total)
– TKR noise occupancy better than spec
– 1 CAL crystal (out of 1536) with 1 (out of 4) readouts
disabled
 Smooth operations
– < 1% downtime (+ ~15% in SAA)
 All photon data are public
– 680M photons so far
Cumulative LAT Trigger counts
2012-07-09
D. Bastieri - INFN Gruppo II
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Fermi mission status
minimum  approved
goal
 NASA 2012 Senior Review recommended extended operations
– http://science.nasa.gov/astrophysics/2012-senior-review/
 NASA HQ will extend the mission to at least 2016
2012-07-09
D. Bastieri - INFN Gruppo II
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Fermi in public
Collaboration papers
 Maintaining public data and analysis tools is worth the effort
 “Prize-winning” science (2011 AAS HEAD Rossi Prize, 2012 APS
Panofsky Prize)
 Effective outreach program (www.nasa.gov/fermi/ + app Fermi Sky)
2012-07-09
D. Bastieri - INFN Gruppo II
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Supporting science with event level analysis
 Current: completing extensive validation and study of
systematic uncertainties
 Next generation: redesigning event reconstruction and
background rejection to enhance science potential
– new TKR recon  Tree vs multiple tracks recon,
independent from CAL recon  better Point Spread
Function
– new CAL recon  clustering, extend to 2 TeV
– new ACD recon  improved and more flexible pointing to
TKR and CAL, background rejection
– Pile-up events tagging (TKR, CAL, ACD)  ghost removal
– New background rejection  multiple classes of events to
serve different science goals
2012-07-09
D. Bastieri - INFN Gruppo II
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Cosmic Ray Highlights
PRL108 (2012)
PRL102 (2009) - PRD 82 (2010)
…. and prospects
 CRE spectrum up to 2 TeV
 Proton isotropy
 proton spectrum upturn at
~300 GeV measured by
PAMELA with g-rays from the
Earth
2012-07-09
D. Bastieri - INFN Gruppo II
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Super Novae Remnants Status
arXiv:1201.0988
…. and prospects
 measure how CR acceleration depends on age and environment
 disentangle emission mechanisms in dense media and possibly for young
SNRs by isolating CR proton p0 emission from leptonic features
2012-07-09
D. Bastieri - INFN Gruppo II
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Crab Nebula flaring again!
2012-07-09
D. Bastieri - INFN Gruppo II
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Gigantic flare from the Crab Nebula
A. Abdo et al., Science 331, 739 (2011).
From 30 to 100 times brighter than usual. Detected in radio but not detected
by Chandra, even if during the (second) big flare it was pointing the Crab
2012-07-09
D. Bastieri - INFN Gruppo II
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Dark Matter Searches Status
PRL107 (2011)
Multiple targets and search strategies
 Satellites (ApJ 747, 2012)
 Lines (PRL 104, 2010)
 IGRB (JCAP 04, 2010)
 Galaxy clusters (JCAP 05, 2010)
 Neutron stars (JCAP 12, 2012)
 CREs (PRL 102, 2009, PRD82, 2010)
 Halo
 Dwarf galaxies (PRL 107, 2011)
 g-ray anisotropies (arXiv:1202.2856)
…. and prospects
 detect/constrain WIMPs annihilation/decay up to several hundred GeV,
 Strengthen multi-wavelength studies for detailed modeling of the Galactic
center to assess claims of a dark matter signature
2012-07-09
D. Bastieri - INFN Gruppo II
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Solar and terrestrial physics status
…. and prospects
 characterize solar flares during
solar maximum and the declining
phase of the solar cycle
APOD 3-15-2012
2012-07-09
 study geographically, seasonal,
and land/ocean differences in
Terrestrial g-ray Flashes and their
initiating storm systems
D. Bastieri - INFN Gruppo II
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Fermi LAT in Padova
 AGN and multiwavelength campaigns:
– Denis Bastieri & Sara Buson (+ Carlo Romoli)
 Galactic plane sources and galactic diffuse emissions
– Luigi Tibaldo & Giovanna Pivato (+ Valentina Tronconi)
 Galactic diffuse group (coordinator)
– Luigi Tibaldo
 Instrument Response Functions
– Riccardo Rando
 Flare Advocate/Gamma-ray Sky Watcher
– Denis Bastieri (sw) & Sara Buson (analysis)
 Parallel computing
– Denis Bastieri
2012-07-09
D. Bastieri - INFN Gruppo II
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Coinvolgimento padovano: contact authors






Denis Bastieri (2 cat II + 1 cat III) AGN
Sara Buson (2 cat I + 7 cat II) AGN
Giovanna Pivato (1 cat II) HB 21
Riccardo Rando (1 cat I) IRFs pass 7
Luigi Tibaldo (4 cat I + 1 cat II) gal/diff
TOTALE (7 cat I + 11 cat II + 1 cat III)
2012-07-09
D. Bastieri - INFN Gruppo II
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The TeV AGN portfolio
 Cutoff of AGNs at Fermi LAT energies and beyond
 Sara Buson PhD thesis
 z > 1.246 (?!?)
 IGMF
 New physics
 Entering
CTA realms
2012-07-09
P
K
S
0
4
D. Bastieri
- INFN Gruppo II
4
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Percentuali 2013
Denis Bastieri
RU
60%
Sara Buson
PhD
100%
Giovanna Pivato
PhD
100%
Riccardo Rando
RU
90%
Luigi Tibaldo
postdoc
80%
TOTALE
5
4.3 FTE
2012-07-09
D. Bastieri - INFN Gruppo II
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Richieste 2013
 Missioni Estere
– Attività ISOC (1m/u)
– Riunioni Analysis/Science Working Group
(3 missioni da 7 gg per 2 persone)
– Collab. Meeting (6 missioni da 7 gg)
 Missioni Interne
– riunioni software + Collab. italiana
– riunioni resp locale con referees e/o CSN2
 Materiale di Consumo (metabolismo)
 Mat. Inventariabile (mantenimento: server dischi)
 Totale
8 k€
18 k€
18 k€
10 k€
2 k€
3 k€
4 k€
63 k€
 Servizio calcolo: ordinaria manutenzione < 1 mese/uomo
2012-07-09
D. Bastieri - INFN Gruppo II
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