Surveying the Galactic Plane with VERITAS and GLAST

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Surveying the Galactic Plane with VERITAS and
GLAST

• Amanda Weinstein, UCLA
• Getting Involved with GLAST workshop May 22, 2007
• UCLA

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The EGRET Sky

• The galaxy we used to know

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Parameter EGRET GLAST LAT VERITAS
Energy Range 35 MeV-30 GeV
Energy Resolution lt15 lt10 15
Duty cycle 100 100 12
Field of View 0.5 sr 2.2 sr 3.5 deg
Angular Resolution 1.5 deg _at_ 1GeV 0.5deg _at_ 10GeV 0.1 deg _at_ 10 GeV 0.42 deg _at_ 1 GeV 0.1 deg
Effective area 0.3m2 1 m2 105 m2
Point source sensitivity 1.2?10-8 cm2s-1 Egt1 GeV 1.5?10-10 cm2s-1 Egt1 GeV 10 -11cm2s-1 Egt100 GeV

• 20 MeV -300 GeV

• 100 GeV - 50 TeV

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GLAST and IACT Surveys
HESS 4-IACT array Galactic plane survey 04
? large catalog of new TeV sources
VERITAS 4-IACT array Cygnus region survey
(current)
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VERITAS Sky Survey
Cygnus region 52ltllt82, -1ltblt4

• Survey with VERITAS-4
• 200 hours over a 2-yr period (07-8)
• Even coverage, sensitive to point sources at 5
  of Crab flux
• Minimal time budgeted for follow-up

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Survey Speculations/Expectations

• PWN 3-4 high spindown loss-rate pulsars which
  meet HESS criterion for likely PWN detection
• 11-12 X-ray sources
• 5 HMXBs
• 7 LMXBs
• Confirmed TeV sources
• MGRO sources
• TeVJ2032

ROSAT TeV Sources
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Parameter EGRET GLAST LAT VERITAS
Energy Range 35MeV-30GeV 20MeV-300GeV 100GeV-50TeV
Energy Resolution lt15 lt10 15
Duty cycle 100 100 12
Field of View 0.5 sr 2.2 sr 3.5 deg
Angular Resolution 1.5 deg _at_ 1GeV 0.5deg _at_ 10GeV 0.1 deg _at_ 10 GeV 0.42 deg _at_ 1 GeV
Effective area 0.3m2 1 m2 105 m2
Point source sensitivity 1.2?10-8 cm2s-1 Egt1 GeV 1.5?10-10 cm2s-1 Egt1 GeV 10 -11cm2s-1 Egt100 GeV
0.1 deg
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Implications
Simulated GLAST data
HESS data

• Source identification
• VERITAS angular resolution an advantage
• TeV instruments less affected by diffuse
  background
• Modelling emissions process in SNR
• Microquasars (contemporaneous light curves)
• PWNe
• TeV instruments powerful tool for detecting
  mapping unpulsed emission from PWNe

SNR RX J1713.7-3946
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Cooperation

• VERITAS will provide a TeV survey of Cygnus
  region
• Joint source analysis, x-calibration valuable
• From VERITAS side, follow-up critical
• Light curves
• Spectra
• Follow-up time in 2009 likely to be comparable to
  time spent on survey itself.
• Limited time for follow-up in 07/08

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Work with us!

• Multi-wavelength input
• Valuable for extracting science
• Enormous impact on follow-up strategy.
• Not only GeV, but radio, x-ray, optical.
• We want to work with you.
• If interested, please contact
• rene_at_astro.ucla.edu
• amandaw_at_astro.ucla.edu

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Supporting Slide VERITAS Survey Coverage

• 0.8 sep. in galactic latitude, 1 longitude