Jim Hinton

MPI-R,

Bonn

3.12.04

Galactic TeV Gamma Ray SourcesGalactic TeV Gamma Ray Sources

A Brief Overview of H.E.S.S. ObservationsA Brief Overview of H.E.S.S. Observations

Gavin Rowell (MPIK Heidelberg) for the H.E.S.S. Collaboration Gavin Rowell (MPIK Heidelberg) for the H.E.S.S. Collaboration

MPI Kernphysik, HeidelbergHumboldt Univ. BerlinRuhr-Univ. BochumUniv. HamburgLandessternwarte HeidelbergUniv. KielEcole Polytechnique, PalaiseauCollege de France, ParisUniv. Paris VI-VIIUniv. Montpellier II

CEA SaclayCESR ToulouseLAOG GrenobleParis ObservatoryDurham Univ.Dublin Inst. for Adv. StudiesCharles Univ., PragueYerewan Physics Inst.Univ. PotchefstroomUniv. of Namibia, Windhoek

The H.E.S.S. Collaboration:

Jim Hinton

MPI-R,

Bonn

3.12.04 HHigh igh EEnergy nergy SStereoscopic tereoscopic SSystemystem

- Array of 4 Imaging Cherenkov Telescopes

(square pattern 120m sides)

- Ground-based stereoscopic Cerenkov technique

- In Namibia, 1800 m a.s.l.

– Good infrastructure - dry, high and clear

--> 4-Tel System completed December 2003

--> Observations so far : roughly ½ Galactic, ½ Extragal

--> 2005: Much time for reobservation/confirmation of new

sources!

Jim Hinton

MPI-R,

Bonn

3.12.04

H.E.S.S. PerformanceH.E.S.S. Performance

HEGRA- 5% of Crab flux in 100 hrs

- 500 GeV Threshold

- Crab flux ~ 10 sigma/sqrt(hr)

H.E.S.S.- 5% Crab flux in 1 hour

- 0.5% Crab in 100 hours

- 100 GeV Threshold

- Angular res better than 0.1°

per event.

- Energy res <= 20%

- Crab flux ~60 sigma/sqrt(hr)

- Similar to ASCA in ang & energy flux sensitivity!

30 sec

1 night

1 year

H.E.S.S. 2004

Crab1989

Cas A2002

H.E.S.S EGRET

Jim Hinton

MPI-R,

Bonn

3.12.04

--> First TeV source with resolved morphology

SNR RX J1713-3946SNR RX J1713-3946

2004: 4-tels 33hrs data2003: 2-tels 18hrs data

42 sigma (2003+2004 data)

--> 2nd paper in preparation

PSFHESS Preliminary

Jim Hinton

MPI-R,

Bonn

3.12.04

RX J1713 – H.E.S.S & ASCARX J1713 – H.E.S.S & ASCA Gamma-ray and X-ray morphology quite similar

ASCA1 – 3 keVUchiyama 2002

HESS Preliminary

Jim Hinton

MPI-R,

Bonn

3.12.04

Preliminary

RX J1713 Spectrum: Whole SNR

Quite hard spectrum

- dN/dE ~ E-2.20+-0.02

- Total flux similar to Crab

- Spectrum extends to E ~ 30 TeV

(>6 sigma E>10 TeV)

--> High ZA obs in 2005 soon!

cf. CANGAROO

dN/dE ~ E -2.84+- 0.15

Jim Hinton

MPI-R,

Bonn

3.12.04

RX J1713: Variations in spectra?

No evidence for a

change in spectral

slope with current

statistics

Factors of 2 change

in brightness.

(similar to X-ray)

HESS Preliminary

Jim Hinton

MPI-R,

Bonn

3.12.04

RX J0852.0-4622 – 'Vela Junior'

2004

- 3hr observation

- 4 tels

- dN/dE E-2.2

- 12 sigma from entire SNR (rad < 1 deg)

~ 1 Crab flux

2005

--> further obs. ~15hr expected soon

--> high ZA obs!

ASCA0.7 – 10 keVSlane 2001

HESS Preliminary

Jim Hinton

MPI-R,

Bonn

3.12.04

Galactic Centre Galactic Centre

-17 hrs data - 2 telescopes - 11 sigma signal - Point source A&A 425, L13 (2004)

- 50 hrs data- 4 telescopes- Sgr A (HESS J1745-290) ~ 35 sigma- 5 sigma/sqrt(hour) - No long term (weekly/monthly) variability- Flux and Spectrum compatible with 2003 --> new paper in preparation

AND a new source seen in the same FoV!

2003

2004

Sgr A

New source!

Jim Hinton

MPI-R,

Bonn

3.12.04

Gal. Centre: at TeV EnergiesGal. Centre: at TeV Energies

HESS: 2003 data:

dN/dE E-2.2

Flux > 160 GeV: (5 % Crab)

CANGAROO:

dN/dE E-4.6

Flux > 160 GeV: (~ 1 Crab)

HESS: 2003 data:

95% limit on source size 3' or ~ 7 pc

95% c.l. on location error ~ 1.5'Sgr A-EAST VLA - 90cm

Sgr A EastChandra & Radio NASA/G.Garmire (PSU)F.Baganoff (MIT)

Yusef-Zadeh (NWU)

Location and size consistent with SgrA* or Sgr A-East --> 2004 results soon.....

Jim Hinton

MPI-R,

Bonn

3.12.04SNRG0.9+0.1

Sgr A

VHE - H.E.S.S. Radio 90cm - VLA

Pt src for H.E.S.S. 13 sigma (2004) 4 sigma (2003)

- Flux ~2% Crab faintest galactic TeV source! (~8 kpc distant)

- L ~ 2 x 1034 ergs/s (0.2-10 TeV) (cf. Crab 4 x 1034 ergs/s)

- dN/dE E-2.4

- Inverse Compton matches SED --> electron acceleration

G0.9+0.1 Composite SNR

Jim Hinton

MPI-R,

Bonn

3.12.04

PSR B1259-63PSR B1259-63 binary pulsarbinary pulsar

March 04 Apr./May 04Feb. 04

- 48 ms pulsar + 10 solar mass

Be-star with outflow.

- 3.4 year orbital period.

- Last periastron 7th Mar 2004

- dN/dE E-2.7

- 8% Crab (ave Feb-May)

- flux increase factor ~ 3-4 after disk-crossing epoch (cf. radio)

The first variable galactic TeV source!

Jim Hinton

MPI-R,

Bonn

3.12.04

HESS J1303-631

PSRB 1259-63

HESS J1303-631: A new UnID TeV Src

Feb 04 Mar 04 Apr/May 04

- First time: Two TeV sources in same FoV

- dN/dE E-2.2 17% Crab

- Extended: radius ~ 10 arcmin

- No obvious counterpart..... but positioned in OB assoc Cen OB1 (energy for particle accel...

HI shells assoc. with Cen OB1 McCLure-Griffiths et al. 2001

Jim Hinton

MPI-R,

Bonn

3.12.04

MSH 15-5-02 / PSRB1509-58: Plerion

+

SNR ShellG320.4-1.2: = 35'

PSR B1509-58P = 150ms

PWN

- 22h HESS data

- 25 sigma (pt src at PSRB1509)!

- Gamma & X-ray morphologies similar

- dN/dE ~ E-2.3 (15% Crab) (cf. CANGAROO ~10% Crab ~4-5sigma)

Power law to > 30 TeV

Jim Hinton

MPI-R,

Bonn

3.12.04

0°

30°

330

°

1°

HESS J1837+069

HESS J1834-087

HESS J1825-137

HESS J1813-178HESS J1804-216

G 0.9+0.1

Gal. Centre

RX J1713.7-3946HESS J1640-485

HESS J1616-508

HESS J1614-518

see Science (2005) v307, 1938

Gal. Scan (2004) long = -30° to +30°

--> Eight new TeV sources

Jim Hinton

MPI-R,

Bonn

3.12.04

Jim Hinton

MPI-R,

Bonn

3.12.04

Gal. Scan (2004): Overview

- Eight new TeV sources (110 hrs + followup obs.) > 6 sigma (post-trial)

- ALL are extended ~ 2 to 10 arcmin (radius)

- Flux ~ 7 to 15% Crab

- dN/dE ~ E- majority ~ 2.1 to 2.5

- Lat dist ~ SNR & pulsars

- 'Plausible' Conterparts: - SNR/PWN (6 cases)

- Not so obvious in 2 cases.--> more UnID TeV sources

New paper in prep – more new sources from further followup data

Jim Hinton

MPI-R,

Bonn

3.12.04

Summary:

- H.E.S.S. has extended the galactic TeV catalogue to >15 sources (ALL > 6 sigma!)

- Established TeV emission from Shell-SNR and PWN

- >2 unidentified sources (cf. TeV J2032+4130 ....?)

- Fluxes ~ 2 to 15% Crab

- Luminosities of order ~ 1033 to 1034 erg/s (if dist known) (except Crab, Gal Cen., RXJ1713, VelaJnr ~ 1035 erg/s)

- The majority of sources are extended

- Energy spectra are mostly hard (harder than Crab)

--> do these sources extend beyond E > 30 TeV?--> deeper obs. needed but limited by sens. High ZA obs. (more discussion in 2nd talk on Friday..)