HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45

M. P. Ulmer; W. R. Purcell; W. A. Wheaton; W. A. Mahoney

doi:10.1086/169778

HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45

M. P. Ulmer^*, W. R. Purcell, W. A. Wheaton, W. A. Mahoney

^*Corresponding author for this work

Physics and Astronomy

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

10 Scopus citations

Abstract

We report upper limits to the 50 keV-10 MeV gamma-ray pulsations from PSR 1509-58 and PSR 0833-45 (Vela) made with the HEAO 3 gamma-ray spectrometer. The 2 σ upper limit to the 50-300 keV flux from PSR 1509-58 is 6.9 × 10^-6 photons cm^-2 s^-1 keV^-1. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below ∼100 keV. This upper limit is not stringent enough, however, to distinguish between thermal and nonthermal models for the source of the X-ray emission. The 2 σ upper limit to the 3.2-10 MeV flux from PSR 0833-45 is 4.9 × 10^-8 photons cm^-2 s^-1 keV^-1.

Original language	English (US)
Pages (from-to)	485-489
Number of pages	5
Journal	Astrophysical Journal
Volume	369
Issue number	2
DOIs	https://doi.org/10.1086/169778
State	Published - Mar 10 1991

Keywords

Gamma rays: bursts
Pulsars
Stars: individual (PSR 1509-58, PSR 0833-45)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/169778

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@article{142a8dec75964046b4e8d46fc818232a,

title = "HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45",

abstract = "We report upper limits to the 50 keV-10 MeV gamma-ray pulsations from PSR 1509-58 and PSR 0833-45 (Vela) made with the HEAO 3 gamma-ray spectrometer. The 2 σ upper limit to the 50-300 keV flux from PSR 1509-58 is 6.9 × 10-6 photons cm-2 s-1 keV-1. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below ∼100 keV. This upper limit is not stringent enough, however, to distinguish between thermal and nonthermal models for the source of the X-ray emission. The 2 σ upper limit to the 3.2-10 MeV flux from PSR 0833-45 is 4.9 × 10-8 photons cm-2 s-1 keV-1.",

keywords = "Gamma rays: bursts, Pulsars, Stars: individual (PSR 1509-58, PSR 0833-45)",

author = "Ulmer, {M. P.} and Purcell, {W. R.} and Wheaton, {W. A.} and Mahoney, {W. A.}",

year = "1991",

month = mar,

day = "10",

doi = "10.1086/169778",

language = "English (US)",

volume = "369",

pages = "485--489",

journal = "Astrophysical Journal",

issn = "0004-637X",

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TY - JOUR

T1 - HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45

AU - Ulmer, M. P.

AU - Purcell, W. R.

AU - Wheaton, W. A.

AU - Mahoney, W. A.

PY - 1991/3/10

Y1 - 1991/3/10

N2 - We report upper limits to the 50 keV-10 MeV gamma-ray pulsations from PSR 1509-58 and PSR 0833-45 (Vela) made with the HEAO 3 gamma-ray spectrometer. The 2 σ upper limit to the 50-300 keV flux from PSR 1509-58 is 6.9 × 10-6 photons cm-2 s-1 keV-1. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below ∼100 keV. This upper limit is not stringent enough, however, to distinguish between thermal and nonthermal models for the source of the X-ray emission. The 2 σ upper limit to the 3.2-10 MeV flux from PSR 0833-45 is 4.9 × 10-8 photons cm-2 s-1 keV-1.

AB - We report upper limits to the 50 keV-10 MeV gamma-ray pulsations from PSR 1509-58 and PSR 0833-45 (Vela) made with the HEAO 3 gamma-ray spectrometer. The 2 σ upper limit to the 50-300 keV flux from PSR 1509-58 is 6.9 × 10-6 photons cm-2 s-1 keV-1. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below ∼100 keV. This upper limit is not stringent enough, however, to distinguish between thermal and nonthermal models for the source of the X-ray emission. The 2 σ upper limit to the 3.2-10 MeV flux from PSR 0833-45 is 4.9 × 10-8 photons cm-2 s-1 keV-1.

KW - Gamma rays: bursts

KW - Pulsars

KW - Stars: individual (PSR 1509-58, PSR 0833-45)

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U2 - 10.1086/169778

DO - 10.1086/169778

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JF - Astrophysical Journal

IS - 2

ER -

HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45

Abstract

Keywords

ASJC Scopus subject areas

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