Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring

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

doi:10.1086/174978

Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring

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

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Abstract

Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars, and, in particular, to test predictions of shock models for the early phases of flare evolution. It is shown that time delays between light curves and flare amplitudes at different frequencies are in good agreement with existing shock models. Evidence is found for the flares in BL Lac objects to reach maximal development at lower frequency than those of optically violent variable quasars. On short timescales the variability behavior is complex, with 'flickering' over a range of amplitudes. Most objects that underwent a large outburst during the monitoring period show a flattening of the 375-150 GHz spectral slope with increasing 270 GHz flux.

Original language	English
Pages (from-to)	91-107
Number of pages	17
Journal	The Astrophysical Journal
Volume	437
Issue number	1
DOIs	https://doi.org/10.1086/174978
Publication status	Published - 1 Dec 1994

Keywords

ASTRONOMICAL MODELS, BL LACERTAE OBJECTS, INFRARED ASTRONOMY, MILLIMETER WAVES, QUASARS, RADIO ASTRONOMY, RADIO JETS (ASTRONOMY), SUBMILLIMETER WAVES, ASTRONOMICAL PHOTOMETRY, ASTRONOMICAL SPECTROSCOPY, CONTINUUMS, INFRARED TELESCOPES, MATHEMATICAL MODELS, RADIO TELESCOPES, SHOCK WAVE INTERACTION

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10.1086/174978

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@article{de7320918434424abb3ff19463ad77e9,

title = "Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring",

abstract = "Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars, and, in particular, to test predictions of shock models for the early phases of flare evolution. It is shown that time delays between light curves and flare amplitudes at different frequencies are in good agreement with existing shock models. Evidence is found for the flares in BL Lac objects to reach maximal development at lower frequency than those of optically violent variable quasars. On short timescales the variability behavior is complex, with 'flickering' over a range of amplitudes. Most objects that underwent a large outburst during the monitoring period show a flattening of the 375-150 GHz spectral slope with increasing 270 GHz flux. ",

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author = "Jason Stevens and S.J. Litchfield and E.I. Robson and D.H. Hughes and W.K. Gear and H. Terasranta and E. Valtaoja and M. Tornikoski",

year = "1994",

month = dec,

day = "1",

doi = "10.1086/174978",

language = "English",

volume = "437",

pages = "91--107",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

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TY - JOUR

T1 - Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring

AU - Stevens, Jason

AU - Litchfield, S.J.

AU - Robson, E.I.

AU - Hughes, D.H.

AU - Gear, W.K.

AU - Terasranta, H.

AU - Valtaoja, E.

AU - Tornikoski, M.

PY - 1994/12/1

Y1 - 1994/12/1

N2 - Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars, and, in particular, to test predictions of shock models for the early phases of flare evolution. It is shown that time delays between light curves and flare amplitudes at different frequencies are in good agreement with existing shock models. Evidence is found for the flares in BL Lac objects to reach maximal development at lower frequency than those of optically violent variable quasars. On short timescales the variability behavior is complex, with 'flickering' over a range of amplitudes. Most objects that underwent a large outburst during the monitoring period show a flattening of the 375-150 GHz spectral slope with increasing 270 GHz flux.

AB - Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars, and, in particular, to test predictions of shock models for the early phases of flare evolution. It is shown that time delays between light curves and flare amplitudes at different frequencies are in good agreement with existing shock models. Evidence is found for the flares in BL Lac objects to reach maximal development at lower frequency than those of optically violent variable quasars. On short timescales the variability behavior is complex, with 'flickering' over a range of amplitudes. Most objects that underwent a large outburst during the monitoring period show a flattening of the 375-150 GHz spectral slope with increasing 270 GHz flux.

KW - ASTRONOMICAL MODELS, BL LACERTAE OBJECTS, INFRARED ASTRONOMY, MILLIMETER WAVES, QUASARS, RADIO ASTRONOMY, RADIO JETS (ASTRONOMY), SUBMILLIMETER WAVES, ASTRONOMICAL PHOTOMETRY, ASTRONOMICAL SPECTROSCOPY, CONTINUUMS, INFRARED TELESCOPES, MATHEMATICAL MODELS

U2 - 10.1086/174978

DO - 10.1086/174978

M3 - Article

SN - 0004-637X

VL - 437

SP - 91

EP - 107

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring

Abstract

Keywords

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