A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars

W.K. Gear; Jason Stevens; D.H. Hughes; S.J. Litchfield; E.I. Robson; H. Terasranta; E. Valtaoja; H. Steppe; M. F. Aller; H. D. Aller

A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars

W.K. Gear, Jason Stevens, D.H. Hughes, S.J. Litchfield, E.I. Robson, H. Terasranta, E. Valtaoja, H. Steppe, M. F. Aller, H. D. Aller

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

77 Citations (Scopus)

Abstract

We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude that the same basic physical model applies to the continuum emission over this frequency range in both cases. There is clear evidence in the data for the BL Lacs to have flatter 150-375 GHz spectra, and we attribute the effect to an intrinsic difference between the underlying jets in the two types of object. A similar difference in the 37-270 GHz spectral indices between the two types can be attributed to a simple redshifting of the synchrotron self-absorption turnover.

Original language	English
Pages (from-to)	167-186
Journal	Monthly Notices of the Royal Astronomical Society (MNRAS)
Volume	267
Issue number	1
Publication status	Published - 1 Mar 1994

Cite this

@article{9a656d41d8444735bcd08afe613af643,

title = "A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars",

abstract = "We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude that the same basic physical model applies to the continuum emission over this frequency range in both cases. There is clear evidence in the data for the BL Lacs to have flatter 150-375 GHz spectra, and we attribute the effect to an intrinsic difference between the underlying jets in the two types of object. A similar difference in the 37-270 GHz spectral indices between the two types can be attributed to a simple redshifting of the synchrotron self-absorption turnover. ",

author = "W.K. Gear and Jason Stevens and D.H. Hughes and S.J. Litchfield and E.I. Robson and H. Terasranta and E. Valtaoja and H. Steppe and Aller, {M. F.} and Aller, {H. D.}",

year = "1994",

month = mar,

day = "1",

language = "English",

volume = "267",

pages = "167--186",

journal = "Monthly Notices of the Royal Astronomical Society (MNRAS)",

issn = "0035-8711",

publisher = "Oxford University Press (OUP)",

number = "1",

}

TY - JOUR

T1 - A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars

AU - Gear, W.K.

AU - Stevens, Jason

AU - Hughes, D.H.

AU - Litchfield, S.J.

AU - Robson, E.I.

AU - Terasranta, H.

AU - Valtaoja, E.

AU - Steppe, H.

AU - Aller, M. F.

AU - Aller, H. D.

PY - 1994/3/1

Y1 - 1994/3/1

N2 - We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude that the same basic physical model applies to the continuum emission over this frequency range in both cases. There is clear evidence in the data for the BL Lacs to have flatter 150-375 GHz spectra, and we attribute the effect to an intrinsic difference between the underlying jets in the two types of object. A similar difference in the 37-270 GHz spectral indices between the two types can be attributed to a simple redshifting of the synchrotron self-absorption turnover.

AB - We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude that the same basic physical model applies to the continuum emission over this frequency range in both cases. There is clear evidence in the data for the BL Lacs to have flatter 150-375 GHz spectra, and we attribute the effect to an intrinsic difference between the underlying jets in the two types of object. A similar difference in the 37-270 GHz spectral indices between the two types can be attributed to a simple redshifting of the synchrotron self-absorption turnover.

M3 - Article

SN - 0035-8711

VL - 267

SP - 167

EP - 186

JO - Monthly Notices of the Royal Astronomical Society (MNRAS)

JF - Monthly Notices of the Royal Astronomical Society (MNRAS)

IS - 1

ER -

A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars

Abstract

Fingerprint

Cite this