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

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

doi:10.1086/174978

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

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

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

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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	Astrophysical Journal
Volume	437
Issue number	1
DOIs	https://doi.org/10.1086/174978
Publication status	Published - 10 Dec 1994
Externally published	Yes

Keywords

BL Lacertae objects: general
Galaxies: jets
Quasars: general
Radiation mechanisms: nonthermal
Radio continuum: galaxies

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10.1086/174978

Cite this

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title = "Multifrequency observations of blazars. V. 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.",

keywords = "BL Lacertae objects: general, Galaxies: jets, Quasars: general, Radiation mechanisms: nonthermal, Radio continuum: galaxies",

author = "Stevens, \{J. A.\} and Litchfield, \{S. J.\} and Robson, \{E. I.\} and Hughes, \{D. H.\} and Gear, \{W. K.\} and H. Ter{\"a}sranta and E. Valtaoja and M. Tornikoski",

year = "1994",

month = dec,

day = "10",

doi = "10.1086/174978",

language = "English",

volume = "437",

pages = "91--107",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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TY - JOUR

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

AU - Stevens, J. A.

AU - Litchfield, S. J.

AU - Robson, E. I.

AU - Hughes, D. H.

AU - Gear, W. K.

AU - Teräsranta, H.

AU - Valtaoja, E.

AU - Tornikoski, M.

PY - 1994/12/10

Y1 - 1994/12/10

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 - BL Lacertae objects: general

KW - Galaxies: jets

KW - Quasars: general

KW - Radiation mechanisms: nonthermal

KW - Radio continuum: galaxies

UR - https://www.scopus.com/pages/publications/12044259272

U2 - 10.1086/174978

DO - 10.1086/174978

M3 - Article

AN - SCOPUS:12044259272

SN - 0004-637X

VL - 437

SP - 91

EP - 107

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

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

Abstract

Keywords

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