HEAO 1 measurements of the galactic ridge

D. M. Worrall; F. E. Marshall; E. A. Boldt; J. H. Swank

HEAO 1 measurements of the galactic ridge

D. M. Worrall, F. E. Marshall, E. A. Boldt, J. H. Swank

School of Physics

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Abstract

The HEAO A2 experiment data was systematically searched for unresolved galactic disc emission. Although there were suggestions of non-uniformities in the emission, the data were consistent with a disc of half-thickness 241 + 22 pc and surface emissivity (2-10 keV) at galactic radius R(kpc) of 2.2 10 to the minus 7th power exp(-R/3.5) erg/sq cm to the (-2)power/s (R 7.8 kpc). giving a luminosity of approximately 4.4 10 to the 37th power erg S to the (-1) power. If the model is extrapolated to radii less than 7.8 kpc, the unresolved disc emission is approximately 1.4 10 to the 38th power erg S to the (-1) power (2-10 keV) i.e., a few percent of the luminosity of the galaxy in resolved sources. the disc emission has a spectrum which is significantly softer than that of the high galactic latitude diffuse X-ray background and it is most probably of discrete source origin.

Original language	English
Pages	20097
Number of pages	38
Volume	82
No.	83844
Specialist publication	NASA Technical Memoranda
Publisher	NASA
Publication status	Published - 1 Oct 1981

Keywords

Absorption Spectra
Astronomical Models
Compton Effect
Emission Spectra
Galactic Radiation
Galactic Structure
Heao 2
X Ray Sources
Astrophysics
Bremsstrahlung
Gamma Rays
Hydrogen
Intergalactic Media
Luminosity
Mathematical Models
Radiant Flux Density
Synchrotron Radiation

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@misc{53b9941ab70c4cc88e0a0806b5fd8b9e,

title = "HEAO 1 measurements of the galactic ridge",

abstract = "The HEAO A2 experiment data was systematically searched for unresolved galactic disc emission. Although there were suggestions of non-uniformities in the emission, the data were consistent with a disc of half-thickness 241 + 22 pc and surface emissivity (2-10 keV) at galactic radius R(kpc) of 2.2 10 to the minus 7th power exp(-R/3.5) erg/sq cm to the (-2)power/s (R 7.8 kpc). giving a luminosity of approximately 4.4 10 to the 37th power erg S to the (-1) power. If the model is extrapolated to radii less than 7.8 kpc, the unresolved disc emission is approximately 1.4 10 to the 38th power erg S to the (-1) power (2-10 keV) i.e., a few percent of the luminosity of the galaxy in resolved sources. the disc emission has a spectrum which is significantly softer than that of the high galactic latitude diffuse X-ray background and it is most probably of discrete source origin.",

keywords = "Absorption Spectra, Astronomical Models, Compton Effect, Emission Spectra, Galactic Radiation, Galactic Structure, Heao 2, X Ray Sources, Astrophysics, Bremsstrahlung, Gamma Rays, Hydrogen, Intergalactic Media, Luminosity, Mathematical Models, Radiant Flux Density, Synchrotron Radiation",

author = "Worrall, {D. M.} and Marshall, {F. E.} and Boldt, {E. A.} and Swank, {J. H.}",

year = "1981",

month = oct,

day = "1",

language = "English",

volume = "82",

pages = "20097",

journal = "NASA Technical Memoranda",

publisher = "NASA",

}

TY - GEN

T1 - HEAO 1 measurements of the galactic ridge

AU - Worrall, D. M.

AU - Marshall, F. E.

AU - Boldt, E. A.

AU - Swank, J. H.

PY - 1981/10/1

Y1 - 1981/10/1

N2 - The HEAO A2 experiment data was systematically searched for unresolved galactic disc emission. Although there were suggestions of non-uniformities in the emission, the data were consistent with a disc of half-thickness 241 + 22 pc and surface emissivity (2-10 keV) at galactic radius R(kpc) of 2.2 10 to the minus 7th power exp(-R/3.5) erg/sq cm to the (-2)power/s (R 7.8 kpc). giving a luminosity of approximately 4.4 10 to the 37th power erg S to the (-1) power. If the model is extrapolated to radii less than 7.8 kpc, the unresolved disc emission is approximately 1.4 10 to the 38th power erg S to the (-1) power (2-10 keV) i.e., a few percent of the luminosity of the galaxy in resolved sources. the disc emission has a spectrum which is significantly softer than that of the high galactic latitude diffuse X-ray background and it is most probably of discrete source origin.

AB - The HEAO A2 experiment data was systematically searched for unresolved galactic disc emission. Although there were suggestions of non-uniformities in the emission, the data were consistent with a disc of half-thickness 241 + 22 pc and surface emissivity (2-10 keV) at galactic radius R(kpc) of 2.2 10 to the minus 7th power exp(-R/3.5) erg/sq cm to the (-2)power/s (R 7.8 kpc). giving a luminosity of approximately 4.4 10 to the 37th power erg S to the (-1) power. If the model is extrapolated to radii less than 7.8 kpc, the unresolved disc emission is approximately 1.4 10 to the 38th power erg S to the (-1) power (2-10 keV) i.e., a few percent of the luminosity of the galaxy in resolved sources. the disc emission has a spectrum which is significantly softer than that of the high galactic latitude diffuse X-ray background and it is most probably of discrete source origin.

KW - Absorption Spectra

KW - Astronomical Models

KW - Compton Effect

KW - Emission Spectra

KW - Galactic Radiation

KW - Galactic Structure

KW - Heao 2

KW - X Ray Sources

KW - Astrophysics

KW - Bremsstrahlung

KW - Gamma Rays

KW - Hydrogen

KW - Intergalactic Media

KW - Luminosity

KW - Mathematical Models

KW - Radiant Flux Density

KW - Synchrotron Radiation

UR - http://adsabs.harvard.edu/abs/1981STIN...8220097W

M3 - Article (Specialist Publication)

VL - 82

SP - 20097

JO - NASA Technical Memoranda

JF - NASA Technical Memoranda

PB - NASA

ER -

HEAO 1 measurements of the galactic ridge

Abstract

Keywords

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