J/A+A/667/A130 HESS J1702-420 XMM-Newton images (Giunti+, 2022)
Constraining leptonic emission scenarios for the PeVatron candidate
HESS J1702-420 with deep XMM-Newton observations.
Giunti L., Acero F., Khelifi B., Kosack K., Lemiere A., Terrier R.
<Astron. Astrophys. 667, A130 (2022)>
=2022A&A...667A.130G 2022A&A...667A.130G (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays ; X-ray sources ; Pulsars
Keywords: gamma-rays: general - X-rays: general -
radiation mechanisms: non-thermal - pulsars: general -
acceleration of particles - methods: data analysis
Abstract:
We aim to search for a hidden leptonic accelerator, such as a high-E
pulsar, associated with the unidentified TeV object HESS J1702-420A.
We carried out a 72ks X-ray observation with the XMM-Newton satellite
and analyzed the resulting data jointly with the publicly available
H.E.S.S. spectral energy distribution (SED) results to derive
constraints on the leptonic contribution to the TeV emission of HESS
J1702-420A. A set of scripts dedicated to the multi-wavelength
modeling of X-ray and gamma-ray data, based on Gammapy, Naima, and
Xspec, has been developed in the context of this work and made
publicly available along with this paper.
No object clearly associated with HESS J1702-420A was found in the
XMM-Newton data. After excluding the unidentified object Suzaku src B
as a possible X-ray counterpart and classifying it as a new
cataclysmic variable source candidate, we derived strict upper limits
on the level of diffuse X-ray emission in the HESS J1702-420A region:
F(2-10keV)≲5.4x10-5keV/cm2/s at 2σ (∼95.5%) confidence
level. A tight constraint on the magnetic field was derived, under a
one-zone leptonic scenario, by jointly fitting the XMM-Newton spectra
and the H.E.S.S. SED: B≲1.45uG at 2σ level. We additionally
report the serendipitous discovery of a new extended X-ray source with
a hard spectral index of 1.99±0.45, named XMMU J170147.3-421407,
which is likely Galactic. Its classification as a high-speed runaway
pulsar wind nebula (PWN), possibly associated with HESS J1702-420A, is
not obvious but cannot be ruled out either.
The hard gamma-ray object HESS J1702-420A remains unidentified, but
the absence of a clear X-ray counterpart strongly challenges simple
leptonic scenarios. The only remaining possible leptonic counterpart
for HESS J1702-420A appears to be a newly discovered X-ray source with
extended morphology and hard spectral index, which may be a PWN
powered by a high-speed runaway pulsar.
Description:
To search for possible X-ray counterparts of HESS J1702-420A, we
proposed a 72ks XMM-Newton observation, which was then carried out on
September 26th 2021. The observation was centered on the position of
Suzaku src B, l=344.093° and b=-0.167° in the Galactic
coordinate system. The region was observed using the three EPIC
instruments on board the XMM-Newton satellite in full frame mode.
After the flare screening, the remaining exposure time is 63ks and
44ks for the MOS and PN cameras, respectively.
Objects:
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RA (2000) DE Designation(s)
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17 02 44.0 -42 00 57 HESS J1702-420A = HESS J1702-420A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 118 2 List of fits images
fits/* . 2 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 46 A19 "datime" Obs.date Observation date
48- 51 I4 Kibyte size Size of FITS file
53- 76 A24 --- FileName Name of FITS file, in subdirectory fits
78-118 A41 --- Title Title of the FITS file
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Acknowledgements:
Luca Giunti, giunti(at)apc.in2p3.fr
(End) Patricia Vannier [CDS] 12-Oct-2022