Chandra Observation of the TeV Source HESS J1834–087

Chandra ACIS observed the field of the extended TeV source HESS J1834-087 for 47 ks. A previous XMM-Newton EPIC observation of the same field revealed a point-like source (XMMU J183435.3-084443) and an offset region of faint extended emission. In the low-resolution, binned EPIC images the two appear...

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Bibliographic Details
Published in:The Astrophysical journal 2011-07, Vol.735 (1), p.33-jQuery1323906983770='48'
Main Authors: Misanovic, Zdenka, Kargaltsev, Oleg, Pavlov, George G
Format: Article
Language:English
Subjects:
ACI
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMIC GAMMA SOURCES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
DUSTS
Flux
Halos
Joints
NEBULAE
Photons
PULSARS
SCATTERING
STARS
X-rays
XMM (spacecraft)
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Summary:Chandra ACIS observed the field of the extended TeV source HESS J1834-087 for 47 ks. A previous XMM-Newton EPIC observation of the same field revealed a point-like source (XMMU J183435.3-084443) and an offset region of faint extended emission. In the low-resolution, binned EPIC images the two appear to be connected. However, the high-resolution Chandra ACIS images do not support the alleged connection. In these images, XMMU J183435.3-084443 is resolved into a point source, CXOU J183434.9-084443 (L 0.5-8 keV 2.3 X 1033 erg s--1, for a distance of 4 kpc; photon index Delta *G 1.1), and a compact ( 20'') nebula with an isotropic morphology and a softer spectrum (L 0.5-8 keV 4.1 X 1033 erg s--1, Delta *G 2.7). The nature of the nebula is uncertain. We discuss a dust scattering halo and a pulsar-wind nebula as possible interpretations. Based on our analysis of the X-ray data, we re-evaluate the previously suggested interpretations of HESS J1834-087 and discuss a possible connection to the Fermi Large Area Telescope source 1FGL J1834.3-0842c. We also obtained an upper limit of 3 X 10--14 erg cm--2 s--1 on the unabsorbed flux of the SGR J1833-0832 (in quiescence), which happened to be in the ACIS field of view.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/735/1/33