Twenty years monitoring of extragalactic sources   at 22, 37 and 87 
GHz

Teräsranta, H.; Achrén, Jani; Hanski, M.; Heikkila, J.; Holopainen, Jani; Joutsamo, O.; Juhola, M.; Karlamaa, K.; Katajainen, S.; Keinänen, P.; Koivisto, P.; Koskimies, M.; Könönen, P.; Lainela, M.; Lahtenmaki, A; Mäkinen, Kauko K.; Niemela, T; Nurmi, P.; Pursimo, T.; Rekola, R.; Savolainen, Tuomas; Tornikoski, M.; Torppa, Johanna; Valtonen, T.; Varjonen, N.; Vilenius, E.; Virtanen, Jani; Wiren, S.

doi:10.1051/0004-6361:20041289

Cited by 87 publications

(81 citation statements)

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“…10 and Teräsranta et al 2004). The data from both single dish monitoring programs showed a monotonic decrease in total flux density of ∼500 mJy at all frequencies during this time range, which is precisely the amount of flux density decrease observed for i8.…”

Section: Flux Density Evolution Of Model Componentssupporting

confidence: 53%

The milliarcsecond-scale jet of PKS 0735+178 during quiescence

Agudo

Gómez

Gabuzda

et al. 2006

A&A

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We present polarimetric 5 GHz to 43 GHz VLBI observations of the BL Lacertae object PKS 0735+178, spanning March 1996 to May 2000. Comparison with previous and later observations suggests that the overall kinematic and structural properties of the jet are greatly influenced by its activity. Time intervals of enhanced activity, as reported before 1993 and after 2000 by other studies, are followed by highly superluminal motion along a rectilinear jet. In contrast the less active state in which we performed our observations, shows subluminal or slow superluminal jet features propagating through a twisted jet with two sharp bends of about 90• within the innermost three-milliarcsecond jet structure. Proper motion estimates from the data presented here allow us to constrain the jet viewing angle to values ≤9• , and the bulk Lorentz factor to be between 2 and 4.

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Section: Flux Density Evolution Of Model Componentssupporting

confidence: 53%

The milliarcsecond-scale jet of PKS 0735+178 during quiescence

Agudo

Gómez

Gabuzda

et al. 2006

A&A

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“…The 3% and 6% differences may be compared to the quoted 5% uncertainty in the flux density scales as given by Perley & Butler (2013). The Metsähovi Observatory is continuously monitoring bright radio sources in the northern sky at 37 GHz (Teräsranta et al 2004). From their sample, sources brighter than 1 Jy were selected and their flux densities averaged over the period of Planck observations used for the PCCS2 (Planck Intermediate results, in prep.…”

Section: External Consistencymentioning

confidence: 99%

Planck2015 results

Ade

Aghanim

Argüeso

et al. 2016

A&A

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192

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The Second Planck Catalogue of Compact Sources is a list of discrete objects detected in single-frequency maps from the full duration of the Planck mission and supersedes previous versions. It consists of compact sources, both Galactic and extragalactic, detected over the entire sky. Compact sources detected in the lower frequency channels are assigned to the PCCS2, while at higher frequencies they are assigned to one of two subcatalogues, the PCCS2 or PCCS2E, depending on their location on the sky. The first of these (PCCS2) covers most of the sky and allows the user to produce subsamples at higher reliabilities than the target 80% integral reliability of the catalogue. The second (PCCS2E) contains sources detected in sky regions where the diffuse emission makes it difficult to quantify the reliability of the detections. Both the PCCS2 and PCCS2E include polarization measurements, in the form of polarized flux densities, or upper limits, and orientation angles for all seven polarization-sensitive Planck channels. The improved data-processing of the full-mission maps and their reduced noise levels allow us to increase the number of objects in the catalogue, improving its completeness for the target 80% reliability as compared with the previous versions, the PCCS and the Early Release Compact Source Catalogue (ERCSC).

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“…Standard procedures of calibration, imaging and self-calibration were employed, and final images were produced with the Perl library FITSPlot 2 . Accuracy of a priori flux scaling was checked by comparing extrapolated zero baseline flux densities of a compact calibrator source, 3C 279, to near-simultaneous observations from VLA polarisation monitoring program (Taylor & Myers 2000) and from Metsähovi Radio Observatory's quasar monitoring program (Teräsranta et al 2004). The comparison shows that the a priori amplitude calibration of our data at 43 GHz is accurate to ∼5%, which is better than the often quoted nominal value of 10%.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Multifrequency VLBA monitoring of 3C 273 during the INTEGRAL Campaign in 2003

Savolainen¹,

Wiik

Valtaoja

et al. 2006

A&A

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In this first of a series of papers describing polarimetric multifrequency Very Long Baseline Array (VLBA) monitoring of 3C 273 during a simultaneous campaign with the INTEGRAL γ-ray satellite in 2003, we present 5 Stokes I images and source models at 7 mm. We show that a part of the inner jet (1−2 milliarcsec from the core) is resolved in a direction transverse to the flow, and we analyse the kinematics of the jet within the first 10 mas. Based on the VLBA data and simultaneous single-dish flux density monitoring, we determine an accurate value for the Doppler factor of the parsec scale jet, and using this value with observed proper motions, we calculate the Lorentz factors and the viewing angles for the emission components in the jet. Our data indicates a significant velocity gradient across the jet with the components travelling near the southern edge being faster than the components with more northern path. We discuss our observations in the light of jet precession model and growing plasma instabilities.

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Twenty years monitoring of extragalactic sources at 22, 37 and 87 GHz

Abstract: Abstract. Long term monitoring results from mid 1995 to the end of 2000 of quasar observations at 22, 37 and 87 GHz done at the Metsähovi radio observatory are presented. Approximately 15 700 observations are published here.

Cited by 87 publications

References 1 publication

The milliarcsecond-scale jet of PKS 0735+178 during quiescence

The milliarcsecond-scale jet of PKS 0735+178 during quiescence

Planck2015 results

Multifrequency VLBA monitoring of 3C 273 during the INTEGRAL Campaign in 2003

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