A Galaxy in VHE Gamma-rays: H.E.S.S. Observations of the Galactic - - PowerPoint PPT Presentation

A Galaxy in VHE Gamma-rays: H.E.S.S. Observations of the Galactic Plane

R D Parsons, P Bordas & S Klepser,

• n behalf of the H.E.S.S. collaboration

HESS Galactic Plane Survey

Almost 2700 hours of observation taken

• n the galactic plane by H.E.S.S.

Coverage to at least 10% Crab Flux Much better in most places

~ 1/4 coverage of the galaxy to 10% Crab Luminosity

10% Crab Horizon 1% Crab Horizon Sources with measured distance

Source Types

78 sources discovered in total Most do not have strong strong associations with known MWL sources Of the known sources PWN are the most numerous class

May have multiple potential counterparts

HESS J1741

Can be used to extract properties

• f PWN

population See poster (731) by Klepser et al Note: selection criteria for PWN candidates are looser

RCW 86

“New Shells”

Blind search made on the HGPS maps for shell-like sources Returned 3 new SNR candidates - HESS J1614-518, HESS J1912+101 & HESS J1534-571 HESS J1614-518 & HESS J1912+101 have no low energy shell counterpart HESS J1534-571 correlates well with SNR G323.7-1.0

RCW 86

RXJ 1713-3946

Region Gamma-ray Extension X-ray Extension 1 0.82o ± 0.02o 0.79o 2 0.78o ± 0.03o 0.74o 3 0.76o ± 0.02o 0.57o 4 0.71o ± 0.02o 0.63o 5 0.63o ± 0.02o 0.64o

One of the best known TeV SNR shells (Flux ~1 Crab) Dataset size and analysis make it possible to make detailed comparisons to X-ray data Clear extension beyond X-ray shell found

RXJ 1713-3946

Region Gamma-ray Extension X-ray Extension 1 0.82o ± 0.02o 0.79o 2 0.78o ± 0.03o 0.74o 3 0.76o ± 0.02o 0.57o 4 0.71o ± 0.02o 0.63o 5 0.63o ± 0.02o 0.64o

One of the best know TeV SNR shells (Flux ~1 Crab) Dataset size and analysis make it possible to make detailed comparisons to X-ray data Clear extension beyond X-ray shell found

Strong evidence of particle escape at shock front

GC Ridge Emission

Breakdown GC ridge emission into individual components

=

GC Ridge Emission

Breakdown GC ridge emission into individual components

+ + + + +

The “Arc” Source

IR + 20 cm radio (contours) Chandra + 20 cm radio (contours)

Good spatial coincidence with PWN G0.13-0.11

16

HESS Position Fit Contour Close to VER J1746-289 (Archer et al, 2016)

The Galactic Centre “PeVatron”

Diffuse emission shows a power-law spectrum up to 50 TeV with no sign of a cut-off Injection model fit to spectrum, solving transport equation of protons injected at the Galactic Centre Quasi continuous injection lasting ~104 years Total CR power injected at GC ~1038 erg/s Parent proton spectrum extends to PeV energies First detection of a galactic PeVatron!

17

HESS J1825-137 Energy > 32 TeV HESS Vela X Tibaldo et al GA134 Mitchell et al GA188

Mitchell et al

Courtesy of Matthias Lorentz

LMC P3

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LMC P3 (GA076)

First VHE detection of an extragalactic binary system

Eta Carinae (GA 156)

Data taken by H.E.S.S. II both before and after periastron passage Analysed using H.E.S.S. in Mono mode (CT5 only)

First VHE detection

• f a colliding wind

binary system

Keep an eye out for many other interesting H.E.S.S. galactic results, e.g.

Holler et al, Advanced search for the extension of unresolved TeV sources with H.E.S.S.,GA307 Zefi et al, Spectral and variability studies of the Crab Nebula using a decade of H.E.S.S.

• bservations, GA 162

Tsirou et al, VHE gamma-ray study of the composite SNR MSH 15-52 with H.E.S.S., GA 289 Lopez-Coto et al, Morphological and spectral measurements of 2HWC J1928+178 with HAWC and H.E.S.S., GA 070

Special Issue (Released)

Detailed spectral and morphological analysis of the shell type SNR RCW 86 - http:// adsabs.harvard.edu/abs/2016arXiv160104461H Extended VHE gamma-ray emission towards SGR1806-20, LBV1806-20, and stellar cluster Cl*1806-20 - http://adsabs.harvard.edu/abs/2016arXiv160605404A A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations - http://adsabs.harvard.edu/abs/2016arXiv160704613H The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT - http:// adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1609.00600 H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution; evidence for gamma-ray emission extending beyond the X-ray emitting shell - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1609.08671 Systematic search for very-high-energy gamma-ray emission from bow shocks of runaway stars - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1705.02263 The population of TeV pulsar wind nebulae in the H.E.S.S. Galactic Plane Survey - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1702.08280 Deeper H.E.S.S. Observations of Vela Junior (RX J0852.0-4622): Morphology Studies and Resolved Spectroscopy - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv: 1611.01863 Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1706.04535 Constraints on particle acceleration in SS433/W50 from MAGIC and H.E.S.S.

• bservations - http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1707.03658

Special Issue (Coming soon…)

HESS J1741-302: an unidentified very high energy Gamma-ray source in the Galactic plane Galactic Supernova Remnants Population Study at Very High Gamma-Ray Energies with H.E.S.S The H.E.S.S. Galactic Plane Survey

Thanks for you attention…

Courtesy of Matthias Lorentz