Highlights from the Observations of the Milky Way with H.E.S.S....Preliminary Fermi LAT, [0.1,100]...
Transcript of Highlights from the Observations of the Milky Way with H.E.S.S....Preliminary Fermi LAT, [0.1,100]...
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 1
Highlights from the Observationsof the Milky Way with H.E.S.S.
Nukri Komin*
for the H.E.S.S. Collaboration
*Wits University, Johannesburg, South Africa
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 2
High Energy Stereoscopic System (H.E.S.S.)
■ array of 5 Imaging Air Cherenkov Telescopes
■ record Cherenkov light of air showers
■ 5°/3.2° field of view (CT 1–4/CT5)
■ 30 GeV ... tens of TeV, angular resolution <0.1°
■ Namibia → Southern Hemisphere is ideal for Milky Way observations
see Heike ProkophGAI1b, Thu 13:45
see Heike ProkophGAI1b, Thu 13:45
www.cta-observatory.org
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 3
The H.E.S.S. Galactic Plane Survey
■ [A&A 612, A1 (2018)]
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 4
The Galactic Plane with H.E.S.S. and HAWC
see Armelle Jardin-BlicqGAI2h, Thu 18:15
see Armelle Jardin-BlicqGAI2h, Thu 18:15
HAWC
H.E.S.S.
H.E.S.S.
HAWC
■ overlap of H.E.S.S. and HAWC maps■ different map generation techniques
■ HAWC large FoV■ H.E.S.S. small FoV
■ good match between both instruments
■ reveals extended H.E.S.S. counterparts to HAWC sources
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 5
The Pulsar Wind Nebula HESS J1825–137
■ [A&A 621, A116 (2019)]■ extension out to 1.5° from pulsar → intrinsic diameter ~100pc
■ strong energy-dependent morphology: R ∝E-0.29
■ rules out pure diffusion models■ significant cut-off of spectrum at 19 TeV
Energy (TeV)-410 -310 -210 -110 1 10 210
)-1 s
-2dN
/dE
(erg
cm
2 E
-1310
-1210
-1110
-1010
IC (total)IC (CMB)IC (FIR)IC (IR)IC (VIS)
Fermi-LAT (2011)3FGL (2015)3FHL (2017)H.E.S.S. Total (38 boxes)2HWC J1825-134
PSR B1823-13:
● Ė = 2.8 10✕ 36 erg/s
● age: 21 kyrs
PSR B1823-13:
● Ė = 2.8 10✕ 36 erg/s
● age: 21 kyrs
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 6
The Pulsar Wind Nebula Vela X■ [A&A 627, A100 (2019)]■ H.E.S.S. + Suzaku X-ray data■ magnetic field: ~6 μG
■ no constrain on turbulence■ gamma-ray cut-off between 12 and 16 TeV → electrons up to ~100 TeV
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 7
VHE Pulsations from Pulsars: Vela
■ clear detection of P2 (10-100 GeV)■ power-law spectrum■ [A&A 620, A66 (2018)]■ pulsations at >3 TeV
characteristics:
● Ė = 6.9 10✕ 36 erg/s
● P = 89ms
● age: 11 kyrs
● distance: 280 pc
characteristics:
● Ė = 6.9 10✕ 36 erg/s
● P = 89ms
● age: 11 kyrs
● distance: 280 pc
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 8
VHE Pulsations from Pulsars: PSR B1706-44
see Marion Spir-JacobGAI2a, Thu 16:30
see Marion Spir-JacobGAI2a, Thu 16:30
■ 4.7σ significance■ power-law spectrum■ 4th VHE pulsar
characteristics:
● Ė = 3.4 10✕ 36 erg/s
● P = 102 ms
● age: 17 kyrs
● distance: 2.6 kpc
characteristics:
● Ė = 3.4 10✕ 36 erg/s
● P = 102 ms
● age: 17 kyrs
● distance: 2.6 kpc
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 9
Gamma-Ray Binaries: PSR B1259–63/LS 2883
■ H.E.S.S. observations of 3 periastron passages■ high flux before 1st disk crossing■ minimum at periastron■ high flux during GeV flare
■ pure power-law spectrum■ highest flux point at 45.4 TeV■ cut-off >30 TeV
CT5 mono sky map
see poster no. 82Thu, Fri
see poster no. 82Thu, Fri
characteristics:
● Oe companion star
● pulsar
● eccentricity 0.87
● period 3.4 years
characteristics:
● Oe companion star
● pulsar
● eccentricity 0.87
● period 3.4 years
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 10
Gamma-Ray Binaries: HESS J0632+057
■ VHE observations over 15 years with H.E.S.S., VERITAS and MAGIC■ orbital period: 316-318d■ double-peaked phase-folded light-curve■ ToO observations of flare in Jan 2018
PreliminaryPreliminary
characteristics:
● B0pe companion star
● unknown compact object
● eccentricity 0.6
● period 315-320d
characteristics:
● B0pe companion star
● unknown compact object
● eccentricity 0.6
● period 315-320d
see Gernot MaierGAI6c, Mon 14:00
see Gernot MaierGAI6c, Mon 14:00
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Low-Mass X-Ray Binary MAXI J1820+70
■ outburst in 2018■ VHE observations with H.E.S.S., MAGIC and VERITAS
■ covering most of outburst■ no detection of VHE emission■ high optical activity during high state seen with
MAGIC central pixel
1−10 1Hardness (4-10 keV)/(2-4 keV)
2−10
1−10
1
10/s
in [2
-10]
keV
2co
unts
/cm
MAXI data
H.E.S.S. obs.
MAGIC obs.
VERITAS obs.
Preliminary
31/03/18 30/04/18 30/05/18 29/06/18 29/07/18 28/08/18 27/09/18 27/10/18Date
0
0.5
1
1.5
2
MAX
I/GSC
Har
dnes
s
MAXI/GSC, Hardness: ratio of counts in [4,10 keV] / [2,4 keV]Preliminary
HS HSIM IMSS
31/03/18 30/04/18 30/05/18 29/06/18 29/07/18 28/08/18 27/09/18 27/10/18Date
0
1
2
3
)-1
.s-2
erg.
cm-1
0Fl
ux (1
0
Fermi LAT, [0.1,100] GeV, index -2.5, 99% C.L.Preliminary
58200 58220 58240 58260 58280 58300 58320 58340 58360 58380 58400 58420MJD
0
1000
2000
3000
4000
Swift
/BAT
Flu
x (m
Cra
b)
SWIFT/BAT [15,50] keVH.E.S.S. obs.MAGIC obs.VERITAS obs.
Preliminary
see poster no. 69Thu, Fri
see poster no. 69Thu, Fri
characteristics:
● ~1M☉ companion star
● ~5M☉ black hole
characteristics:
● ~1M☉ companion star
● ~5M☉ black hole
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 12
Observations of Supernovae
■ [A&A 626, A57 (2019)]■ serendipitous observations of core-collapse
supernovae in other galaxies■ distances between 4 and 54 Mpc■ ToO observations of SN2016adj
■ no detection → upper limit on fluxes■ gamma-ray emission depends on ambient
medium→ depends on mass-loss and stellar wind velocity of progenitor
■ SN 1993J like explosions could be detected with H.E.S.S. and CTA
■ strong constraint for progenitor’s mass loss rate for SN2016adj
Time since discovery (days)0 50 100 150 200 250 300 350
SN 2004cxSN 2005dnSN 2008bkSN 2008bpSN 2008hoSN 2009hfSN 2009jsSN 2011jaSN 2012ccSN 2016adj
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 13
Large Magellanic Cloud■ 1st VHE view of LMC
■ no new sources■ N 157B: curved spectrum■ upper limits for SNR, pulsars, HMXB
σ
exposure contours: 10, 20, 50, 100, 200 h
see poster no. 64Sat, Mon
see poster no. 64Sat, Mon
N. Komin, H.E.S.S. Galactic Highlights, 36th ICRC 2019, Madison, 26/07/2019. 14
Summary
■ H.E.S.S. Galactic Plane Survey finished, source hunting over?■ comparison with HAWC reveals new extended sources■ source hunting in the LMC
■ detailed studies of extended sources■ particle transport and magnetic field in PWNe
■ time domain astronomy■ periodic emission from gamma-ray binaries■ outbursts from microquasars■ supernova explosions
■ multi-collaboration studies with VERITAS, MAGIC, HAWC■ extension for 3 more years → more results to come