The ASCA catalog of potential X-ray counterparts of GeV sources

Mallory S.E. Roberts; Roger W. Romani; Nobuyuki Kawai

doi:10.1086/320352

The ASCA catalog of potential X-ray counterparts of GeV sources

Mallory S.E. Roberts, Roger W. Romani, Nobuyuki Kawai

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ~ 85% of the 95% confidence position contour for 28 of the 30 sources with > 1 GeV fluxes above 4 × 10^-8 ph cm^-2 s^-1. We find an excess of hard X-ray sources with F_2-10keV ≳ 10^-12 ergs cm^-2 s^-1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.

Original language	English (US)
Pages (from-to)	451-465
Number of pages	15
Journal	Astrophysical Journal, Supplement Series
Volume	133
Issue number	2
DOIs	https://doi.org/10.1086/320352
State	Published - Apr 2001

Keywords

Gamma rays: observations
Pulsars: general
Stars: Wolf-Rayet
Supernova remnants
X-rays

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/320352

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title = "The ASCA catalog of potential X-ray counterparts of GeV sources",

abstract = "We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ~ 85% of the 95% confidence position contour for 28 of the 30 sources with > 1 GeV fluxes above 4 × 10-8 ph cm-2 s-1. We find an excess of hard X-ray sources with F2-10keV ≳ 10-12 ergs cm-2 s-1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.",

keywords = "Gamma rays: observations, Pulsars: general, Stars: Wolf-Rayet, Supernova remnants, X-rays",

author = "Roberts, {Mallory S.E.} and Romani, {Roger W.} and Nobuyuki Kawai",

year = "2001",

month = apr,

doi = "10.1086/320352",

language = "English (US)",

volume = "133",

pages = "451--465",

journal = "Astrophysical Journal, Supplement Series",

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T1 - The ASCA catalog of potential X-ray counterparts of GeV sources

AU - Roberts, Mallory S.E.

AU - Romani, Roger W.

AU - Kawai, Nobuyuki

PY - 2001/4

Y1 - 2001/4

N2 - We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ~ 85% of the 95% confidence position contour for 28 of the 30 sources with > 1 GeV fluxes above 4 × 10-8 ph cm-2 s-1. We find an excess of hard X-ray sources with F2-10keV ≳ 10-12 ergs cm-2 s-1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.

AB - We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ~ 85% of the 95% confidence position contour for 28 of the 30 sources with > 1 GeV fluxes above 4 × 10-8 ph cm-2 s-1. We find an excess of hard X-ray sources with F2-10keV ≳ 10-12 ergs cm-2 s-1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.

KW - Gamma rays: observations

KW - Pulsars: general

KW - Stars: Wolf-Rayet

KW - Supernova remnants

KW - X-rays

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JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 2

ER -

The ASCA catalog of potential X-ray counterparts of GeV sources

Abstract

Keywords

ASJC Scopus subject areas

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