On the Intrinsic Jet Properties of Fermi-detected Blazars

T. Savolainen; D. C. Homan; T. Hovatta; M. Kadler; Y. Y. Kovalev; M. L. Lister; E. Ros; J. A. Zensus

On the Intrinsic Jet Properties of Fermi-detected Blazars

T. Savolainen, D. C. Homan, T. Hovatta, M. Kadler, Y. Y. Kovalev, M. L. Lister, E. Ros, J. A. Zensus

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

Abstract

We report on an analysis of intrinsic jet properties between sources detected by the Fermi Gamma-ray Space Telescope during its first three months of science operations and those not detected in a sample 62 blazars. By combining high-resolution VLBI images and millimetre-wavelength flux density monitoring data, we have estimated their jet Doppler factors, Lorentz factors, and viewing angles in the observer’s frame and in the frame comoving with the jet. The analysis shows that, in addition to having on average higher variability Doppler factors, the blazars detected by the Fermi have a distribution of comoving frame viewing angles that is significantly narrower than that of the γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at small comoving frame viewing angles hints that their γ-ray emission may be intrinsically anisotropic or depend on the Lorentz factor.

Original language	English
Title of host publication	Accretion and Ejection in AGN: a Global View
Subtitle of host publication	Proceedings of a workshop held June 22-26, 2009 in Como, Italy
Editors	Laura Maraschi, Gabriele Ghisellini, Roberto Della Ceca, Fabrizio Tavecchio
Publisher	Astronomical Society of the Pacific
Pages	306-307
ISBN (Electronic)	978-1-58381-735-3
ISBN (Print)	978-1-58381-734-6
Publication status	Published - 2010
MoE publication type	B3 Non-refereed conference publication
Event	Conference on Accretion and Ejection in AGN: A Global View - Como, Italy Duration: 22 Jun 2009 → 26 Jun 2009

Publication series

Name	Astronomical society of the pacific Conference Series
Publisher	Astronomical Society of the Pacific
Volume	427
ISSN (Print)	1050-3390

Conference

Conference	Conference on Accretion and Ejection in AGN: A Global View
Country/Territory	Italy
City	Como
Period	22/06/2009 → 26/06/2009

Access to Document

http://adsabs.harvard.edu/abs/2010ASPC..427..306S

Metsähovi Radio Observatory
Tammi, J. (Manager)
School of Electrical Engineering
Facility/equipment: Facility

Cite this

Savolainen, T., Homan, D. C., Hovatta, T., Kadler, M., Kovalev, Y. Y., Lister, M. L., Ros, E., & Zensus, J. A. (2010). On the Intrinsic Jet Properties of Fermi-detected Blazars. In L. Maraschi, G. Ghisellini, R. Della Ceca, & F. Tavecchio (Eds.), Accretion and Ejection in AGN: a Global View: Proceedings of a workshop held June 22-26, 2009 in Como, Italy (pp. 306-307). (Astronomical society of the pacific Conference Series; Vol. 427). Astronomical Society of the Pacific. http://adsabs.harvard.edu/abs/2010ASPC..427..306S

Savolainen, T. ; Homan, D. C. ; Hovatta, T. et al. / On the Intrinsic Jet Properties of Fermi-detected Blazars. Accretion and Ejection in AGN: a Global View: Proceedings of a workshop held June 22-26, 2009 in Como, Italy. editor / Laura Maraschi ; Gabriele Ghisellini ; Roberto Della Ceca ; Fabrizio Tavecchio. Astronomical Society of the Pacific, 2010. pp. 306-307 (Astronomical society of the pacific Conference Series).

@inproceedings{c7c65b31825d4d72bdeea02008afe5c2,

title = "On the Intrinsic Jet Properties of Fermi-detected Blazars",

abstract = "We report on an analysis of intrinsic jet properties between sources detected by the Fermi Gamma-ray Space Telescope during its first three months of science operations and those not detected in a sample 62 blazars. By combining high-resolution VLBI images and millimetre-wavelength flux density monitoring data, we have estimated their jet Doppler factors, Lorentz factors, and viewing angles in the observer{\textquoteright}s frame and in the frame comoving with the jet. The analysis shows that, in addition to having on average higher variability Doppler factors, the blazars detected by the Fermi have a distribution of comoving frame viewing angles that is significantly narrower than that of the γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at small comoving frame viewing angles hints that their γ-ray emission may be intrinsically anisotropic or depend on the Lorentz factor.",

author = "T. Savolainen and Homan, {D. C.} and T. Hovatta and M. Kadler and Kovalev, {Y. Y.} and Lister, {M. L.} and E. Ros and Zensus, {J. A.}",

year = "2010",

language = "English",

isbn = "978-1-58381-734-6",

series = "Astronomical society of the pacific Conference Series",

publisher = "Astronomical Society of the Pacific",

pages = "306--307",

editor = "Laura Maraschi and Gabriele Ghisellini and {Della Ceca}, Roberto and Fabrizio Tavecchio",

booktitle = "Accretion and Ejection in AGN: a Global View",

address = "United States",

note = "Conference on Accretion and Ejection in AGN: A Global View ; Conference date: 22-06-2009 Through 26-06-2009",

}

Savolainen, T, Homan, DC, Hovatta, T, Kadler, M, Kovalev, YY, Lister, ML, Ros, E & Zensus, JA 2010, On the Intrinsic Jet Properties of Fermi-detected Blazars. in L Maraschi, G Ghisellini, R Della Ceca & F Tavecchio (eds), Accretion and Ejection in AGN: a Global View: Proceedings of a workshop held June 22-26, 2009 in Como, Italy. Astronomical society of the pacific Conference Series, vol. 427, Astronomical Society of the Pacific, pp. 306-307, Conference on Accretion and Ejection in AGN: A Global View, Como, Italy, 22/06/2009. <http://adsabs.harvard.edu/abs/2010ASPC..427..306S>

On the Intrinsic Jet Properties of Fermi-detected Blazars. / Savolainen, T.; Homan, D. C.; Hovatta, T. et al.
Accretion and Ejection in AGN: a Global View: Proceedings of a workshop held June 22-26, 2009 in Como, Italy. ed. / Laura Maraschi; Gabriele Ghisellini; Roberto Della Ceca; Fabrizio Tavecchio. Astronomical Society of the Pacific, 2010. p. 306-307 (Astronomical society of the pacific Conference Series; Vol. 427).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

TY - GEN

T1 - On the Intrinsic Jet Properties of Fermi-detected Blazars

AU - Savolainen, T.

AU - Homan, D. C.

AU - Hovatta, T.

AU - Kadler, M.

AU - Kovalev, Y. Y.

AU - Lister, M. L.

AU - Ros, E.

AU - Zensus, J. A.

PY - 2010

Y1 - 2010

N2 - We report on an analysis of intrinsic jet properties between sources detected by the Fermi Gamma-ray Space Telescope during its first three months of science operations and those not detected in a sample 62 blazars. By combining high-resolution VLBI images and millimetre-wavelength flux density monitoring data, we have estimated their jet Doppler factors, Lorentz factors, and viewing angles in the observer’s frame and in the frame comoving with the jet. The analysis shows that, in addition to having on average higher variability Doppler factors, the blazars detected by the Fermi have a distribution of comoving frame viewing angles that is significantly narrower than that of the γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at small comoving frame viewing angles hints that their γ-ray emission may be intrinsically anisotropic or depend on the Lorentz factor.

AB - We report on an analysis of intrinsic jet properties between sources detected by the Fermi Gamma-ray Space Telescope during its first three months of science operations and those not detected in a sample 62 blazars. By combining high-resolution VLBI images and millimetre-wavelength flux density monitoring data, we have estimated their jet Doppler factors, Lorentz factors, and viewing angles in the observer’s frame and in the frame comoving with the jet. The analysis shows that, in addition to having on average higher variability Doppler factors, the blazars detected by the Fermi have a distribution of comoving frame viewing angles that is significantly narrower than that of the γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at small comoving frame viewing angles hints that their γ-ray emission may be intrinsically anisotropic or depend on the Lorentz factor.

M3 - Conference article in proceedings

SN - 978-1-58381-734-6

T3 - Astronomical society of the pacific Conference Series

SP - 306

EP - 307

BT - Accretion and Ejection in AGN: a Global View

A2 - Maraschi, Laura

A2 - Ghisellini, Gabriele

A2 - Della Ceca, Roberto

A2 - Tavecchio, Fabrizio

PB - Astronomical Society of the Pacific

T2 - Conference on Accretion and Ejection in AGN: A Global View

Y2 - 22 June 2009 through 26 June 2009

ER -

Savolainen T, Homan DC, Hovatta T, Kadler M, Kovalev YY, Lister ML et al. On the Intrinsic Jet Properties of Fermi-detected Blazars. In Maraschi L, Ghisellini G, Della Ceca R, Tavecchio F, editors, Accretion and Ejection in AGN: a Global View: Proceedings of a workshop held June 22-26, 2009 in Como, Italy. Astronomical Society of the Pacific. 2010. p. 306-307. (Astronomical society of the pacific Conference Series).

On the Intrinsic Jet Properties of Fermi-detected Blazars

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