Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models

D. M. Worrall; J. M. Rodriguez-Espinosa; W. Z. Wisniewski; H. R. Miller; F. C. Bruhweiler; M. F. Aller; H. D. Aller

Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models

D. M. Worrall, J. M. Rodriguez-Espinosa, W. Z. Wisniewski, H. R. Miller, F. C. Bruhweiler, M. F. Aller, H. D. Aller

School of Physics

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Abstract

Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare was measured from 0422 = 004 in which a doubling in visual flux density was noted; other sources displayed smaller daily fluctuations. The 5-15 GHz radio flux from these three objects remained constant for two months, although the 15-20 GHz emission from 0912 + 297 varied slightly over a period of a month. Constraints which are provided by these and other Bl Lac data are discussed for inhomogeneous relativistically beamed jet models. It is concluded that a tapered jet model is in good agreement with the data for each source and that additional emission regions are not required.

Original language	English
Pages (from-to)	589-595
Journal	Astrophysical Journal
Volume	303
Publication status	Published - 1 Apr 1986

Keywords

Astronomical Models
Bl Lacertae Objects
Extragalactic Radio Sources
Radio Jets (Astronomy)
Relativistic Electron Beams
Ultraviolet Astronomy
Astronomical Photometry
Compton Effect
Emission Spectra
Radiant Flux Density
Radio Spectra
Spectral Energy Distribution
Synchrotron Radiation

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@article{39d6a91e8fad41e8b51051d9840ec847,

title = "Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models",

abstract = "Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare was measured from 0422 = 004 in which a doubling in visual flux density was noted; other sources displayed smaller daily fluctuations. The 5-15 GHz radio flux from these three objects remained constant for two months, although the 15-20 GHz emission from 0912 + 297 varied slightly over a period of a month. Constraints which are provided by these and other Bl Lac data are discussed for inhomogeneous relativistically beamed jet models. It is concluded that a tapered jet model is in good agreement with the data for each source and that additional emission regions are not required.",

keywords = "Astronomical Models, Bl Lacertae Objects, Extragalactic Radio Sources, Radio Jets (Astronomy), Relativistic Electron Beams, Ultraviolet Astronomy, Astronomical Photometry, Compton Effect, Emission Spectra, Radiant Flux Density, Radio Spectra, Spectral Energy Distribution, Synchrotron Radiation",

author = "Worrall, {D. M.} and Rodriguez-Espinosa, {J. M.} and Wisniewski, {W. Z.} and Miller, {H. R.} and Bruhweiler, {F. C.} and Aller, {M. F.} and Aller, {H. D.}",

year = "1986",

month = apr,

day = "1",

language = "English",

volume = "303",

pages = "589--595",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

}

TY - JOUR

T1 - Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models

AU - Worrall, D. M.

AU - Rodriguez-Espinosa, J. M.

AU - Wisniewski, W. Z.

AU - Miller, H. R.

AU - Bruhweiler, F. C.

AU - Aller, M. F.

AU - Aller, H. D.

PY - 1986/4/1

Y1 - 1986/4/1

N2 - Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare was measured from 0422 = 004 in which a doubling in visual flux density was noted; other sources displayed smaller daily fluctuations. The 5-15 GHz radio flux from these three objects remained constant for two months, although the 15-20 GHz emission from 0912 + 297 varied slightly over a period of a month. Constraints which are provided by these and other Bl Lac data are discussed for inhomogeneous relativistically beamed jet models. It is concluded that a tapered jet model is in good agreement with the data for each source and that additional emission regions are not required.

AB - Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare was measured from 0422 = 004 in which a doubling in visual flux density was noted; other sources displayed smaller daily fluctuations. The 5-15 GHz radio flux from these three objects remained constant for two months, although the 15-20 GHz emission from 0912 + 297 varied slightly over a period of a month. Constraints which are provided by these and other Bl Lac data are discussed for inhomogeneous relativistically beamed jet models. It is concluded that a tapered jet model is in good agreement with the data for each source and that additional emission regions are not required.

KW - Astronomical Models

KW - Bl Lacertae Objects

KW - Extragalactic Radio Sources

KW - Radio Jets (Astronomy)

KW - Relativistic Electron Beams

KW - Ultraviolet Astronomy

KW - Astronomical Photometry

KW - Compton Effect

KW - Emission Spectra

KW - Radiant Flux Density

KW - Radio Spectra

KW - Spectral Energy Distribution

KW - Synchrotron Radiation

M3 - Article (Academic Journal)

SN - 0004-637X

VL - 303

SP - 589

EP - 595

JO - Astrophysical Journal

JF - Astrophysical Journal

ER -

Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models

Abstract

Keywords

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