Esko Valtaoja | Academic Influence

Esko Valtaoja's AcademicInfluence.com Rankings

Esko Valtaoja

Physics

#8989

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#11329

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Astronomy

#1316

World Rank

#2131

Historical Rank

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Physics

Esko Valtaoja's Degrees

PhD Astronomy University of Turku

Why Is Esko Valtaoja Influential?

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According to Wikipedia, Esko Jorma Johannes Valtaoja is a Finnish professional astronomer and writer. Valtaoja worked as a professor at the University of Turku where he studied quasars. Valtaoja retired in 2015 after holding a popular farewell lecture, that was also televised by Finnish national public broadcaster YLE.

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Esko Valtaoja's Published Works

Number of citations in a given year to any of this author's works

Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author

Published Works

The inner jet of an active galactic nucleus as revealed by a radio-to-γ-ray outburst (2008) (539)
Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies (2008) (314)
Multiwavelength Observations of a Dramatic High-Energy Flare in the Blazar 3C 279 (1997) (224)
Spectral energy distributions of a large sample of BL Lacertae objects (2005) (202)
Total Flux Density Variations in Extragalactic Radio Sources. III. Doppler Boosting Factors, Lorentz Factors, and Viewing Angles for Active Galactic Nuclei (1999) (166)
Multiepoch Multiwavelength Spectra and Models for Blazar 3C 279 (2001) (129)
Radio Monitoring of OJ 287 and Binary Black Hole Models for Periodic Outbursts (2000) (116)
Total Flux Density Variations in Extragalactic Radio Sources. I. Decomposition of Variations into Exponential Flares (1999) (109)
Planck early results. XV. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources (2011) (105)
Long-term radio variability of AGN: flare characteristics (2008) (88)
Blazar sequence – an artefact of Doppler boosting (2008) (80)
Testing of Inverse Compton Models for Active Galactic Nuclei with Gamma-Ray and Radio Observations (2003) (78)
Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring (1994) (78)
The connection between gamma-ray emission and millimeter flares in Fermi/LAT blazars (2011) (77)
Statistical analyses of long-term variability of AGN at high radio frequencies (2007) (76)
A comparison of the radio–submillimetre spectra of BL Lacertae objects and flat-spectrum radio quasars (1994) (71)
Connections between millimetre continuum variations and VLBI structure in 27 AGN (2002) (67)
FLARE-LIKE VARIABILITY OF THE Mg ii λ2800 EMISSION LINE IN THE γ-RAY BLAZAR 3C 454.3 (2013) (62)
Kinematics of the Parsec-Scale Relativistic Jet in Quasar 3C 279: 1991-1997 (2000) (62)
Total Flux Density Variations in Extragalactic Radio Sources. II. Determining the Limiting Brightness Temperature for Synchrotron Sources (1999) (61)
Multifrequency VLBA monitoring of 3C 273 during the INTEGRAL Campaign in 2003 - I. Kinematics of the parsec scale jet from 43 GHz data (2005) (53)
Multifrequency observations of blazars. III - The spectral shape of the radio to X-ray continuum (1989) (52)
Intensive monitoring of OJ 287 (2000) (52)
Tuorla quasar monitoring (2000) (49)
Radio Spectra and Variability of Gigahertz-Peaked Spectrum Radio Sources and Candidates (2001) (40)
Locating the γ-ray emission site in Fermi/LAT blazars from correlation analysis between 37 GHz radio and γ-ray light curves (2015) (36)
37 GHz Observations of a Large Sample of BL Lacertae Objects (2007) (36)
A 15.7-min periodicity in OJ287 (1985) (36)
Radio, millimeter-submillimeter, and infrared spectra of flat-spectrum extragalactic radio sources (1994) (36)
The connection between black hole mass and Doppler boosted emission in BL Lacertae type objects. (2010) (33)
Radio and X-ray observations of the gamma-ray bright quasar PKS 0528 + 134 (1994) (32)
Correlated radio and optical variations in a sample of AGN (2002) (31)
EXPLORING THE RELATION BETWEEN (SUB-)MILLIMETER RADIATION AND γ-RAY EMISSION IN BLAZARS WITH PLANCK AND FERMI (2012) (30)
LONG-TERM VARIABILITY OF RADIO-BRIGHT BL LACERTAE OBJECTS (2009) (29)
Synchrotron flaring in the jet of 3C 279 (2006) (28)
Monitoring of 3C 66A during an extended outburst. I. The light curves (1996) (27)
Millimeter-radio, SOHO/EIT 171 Å features and the polar faculae in the polar zones of the Sun (2001) (27)
The infrared-millimetre-centimetre flaring behaviour of the quasar 3C 273. (1993) (27)
SSC mechanism in the gamma-ray blazar 3C 279 (2005) (26)
UBVRI photopolarimetry of BL Lac objects - The connection between frequency-dependent polarization and growing radio shocks (1991) (25)
Five years monitoring of extragalactic radio sources. III : Generalized shock models and the dependence of variability on frequency (1992) (25)
Correlation between Fermi/LAT gamma-ray and 37 GHz radio properties of northern AGN averaged over 11 months (2011) (25)
Optical Polarization and Imaging of Hot Spots in Radio Galaxies (1999) (24)
Structure Function Analysis of High Radio Frequency Variability in the Metsaehovi Monitoring Sample of Active Galactic Nuclei (1993) (24)
Five years monitoring of extragalactic radio sources. II. Quiescent spectra and the evolution of outbursts. (1988) (24)
Multiwaveband Observations of Quasars with Flat Radio Spectra and Strong Millimeter-Wave Emission (1998) (22)
Possible Identifications for Southern EGRET Sources (2002) (22)
An Extremely Curved Relativistic Jet in PKS 2136+141 (2004) (21)
The High Radio Frequency Spectra and Variability of Southern Flat-Spectrum Radio Sources (2000) (21)
Multiwavelength Observations of the Extreme X-Ray-selected BL Lacertae Object PG 1553+11 (1ES 1553+113) (2006) (19)
The connection between the low polarization quasar 3C 273 and blazars (1991) (19)
The connection between the parsec-scale radio jet and γ-ray flares in the blazar 1156+295 (2014) (19)
Synchrotron flaring behaviour of Cygnus X-3 during the February-March 1994 and September 2001 outbursts (2007) (19)
Multifrequency observations of BL Lacertae in 1988 (1991) (18)
A complete sample of Northern hemisphere active galactic nuclei : differences in flux and spectra at high radio frequencies (1992) (17)
Possible New Identifications for EGRET Sources (1997) (16)
Survey of a complete sample of southern extragalactic radio sources (1993) (16)
The host galaxies of active galactic nuclei with powerful relativistic jets (2016) (16)
Monitoring of the Einstein cross with the Nordic optical telescope (1995) (14)
Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004 - II. Large-scale jet kinematics and the comparison of the different methods of VLBI data imaging as applied to kinematic studies of AGN (2011) (14)
The multifrequency spectral evolution of Blazar 3C 345 during the 1991 outburst (1994) (12)
Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004: I. Inner jet kinematics (2008) (10)
Multi-wavelength observations of 3C 273. II - 1986-1988 (1990) (10)
Long-term radio behaviour of GPS sources and candidates (2009) (10)
Circular polarization and the structure of compact extragalactic radio sources (1984) (10)
Recent activity in the optical and radio lightcurves of the blazar 3C 345 : indications for a 'lighthouse effect' due to jet rotation. (1993) (9)
Multifrequency interferometer and radio continuum monitoring observations of CTA 102 (2003) (8)
Theories of radio halo formation: application to the Coma cluster (1984) (8)
Optical and radio behaviour of the blazar S4 0954+65 (1999) (8)
Radio counterparts of unidentified EGRET gamma-ray sources (1997) (8)
VLBI monitoring of a sample of 15 AGN at 22 GHz I. Data (2001) (7)
Magnetic Field Structure in the Parsec Scale Jet of 3C273 from Multifrequency VLBA Observations (2007) (7)
Radio, optical and photopolarimetric observations of Markarian 421 around the great 1996-97 outburst (1998) (7)
The geometry of the universe from high resolution VLBI data of AGN shocks (2000) (7)
Gamma radiation from radio shocks in AGN jets. (1995) (7)
Enhanced temperature regions in the polar zones of the Sun (1998) (6)
Optical circular polarization in two BL Lacertae objects (1993) (6)
Blazarlike activity in the low polarization quasar 3C 273 (1990) (6)
Brightness temperatures and viewing angles for extragalactic radio sources: a test of unification schemes for active galactic nuclei (1994) (6)
Space VLBI observations of southern hemisphere gamma-ray and non-gamma-ray AGN: First results for PKS 0637-752 (2000) (6)
Millimetre Continuum Variations, VLBI Structure and Gamma-rays: Investigating Shocked Jet Physics (2002) (5)
A quantitative model for radio galaxy evolution (1984) (4)
Long term radio variability of AGN (2008) (4)
SOLAR MICROWAVE BURST EMISSION RELATION TO X-RAY RADIATION (1996) (4)
On the origin of the high-Q high-frequency oscillations of magnetars (2011) (4)
Bending of radio trails by galactic winds and rotation (1986) (4)
A comparison between the CaII(k${\mathsf{_3}}$), H$_{\mathsf{\alpha}}$, SOHO/MDI and radio-enhanced temperature regions of the Sun (2003) (4)
Diffusion of electrons in radio galaxies. (1982) (3)
Radio to γ-ray observations of 3C 454.3:1993–1995 (1997) (3)
Radio and optical evolution of the Seyfert galaxy NGC 1275. (1995) (3)
The relationsship between gamma emission and radio flares in AGN (1996) (3)
OJ287 as a binary system (1988) (3)
Multifrequency observations of the gamma-ray blazar 3C 279 in low-state during INTEGRAL AO-1 (2004) (3)
Five years monitoring of extragalactic radio sources. I. Observations at 12,22 and 37 GHz. (1987) (3)
Multiple hotspots in radio galaxies (1984) (3)
High energy blazar astronomy : proceedings of an international conference held to celebrate the 50th anniversary of Tuorla Observatory, Tuorla Observatory, Piikkiö, Finland, 17-21 June 2002 (2003) (3)
Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993 (1995) (3)
Radio variability of the gamma-ray blazar 0202+149 (2000) (3)
Long-lived active longitudes on the spotted RS CVn star σ Geminorum (1989) (3)
The first space VLBI image of 3C279 (2000) (2)
Quick Detection System for Planck satellite (2007) (2)
Five years monitoring of extragalactic radio sources. IV : Variability statistics and unified models for AGN (1992) (2)
MICROWAVE EMISSION FROM CORONAL HEIGHTS: STUDY OF A NON-THERMAL RADIO FLARE (1997) (2)
The link between broad emission line fluctuations and non-thermal emission from the inner AGN jet (2014) (1)
A simultaneous radio-optical flare in BL Lacertae (1993) (1)
GRB980329 R & I-band observations (1998) (1)
Polar Radio Sources Observed in UV and EUV (1999) (1)
A turned-over optical spectrum of OJ287 during the 1989 minimum (1991) (1)
SOLAR MICROWAVE BURST CLASSIFICATION AND CORRELATION WITH SOFT X-RAYS (1996) (1)
Hydrodynamics of Small-Scale Jets: Observational Aspects (2008) (1)
The Flare Activity of Ad-Leonis 1972-1988 (1990) (1)
Studying the continuum spectrum of the parsec scale jets by multi-frequency VLBI measurements (2008) (1)
Photometry of BL Lac. (1986) (1)
The Time Profiles of Millimeter-wavelength Outbursts During the Most Intense Gamma-ray Flares in AGN (1996) (1)
Simultaneous UBVRI polarimetry of blazars (1989) (1)
Comparison of radio and EGRET gamma-ray properties between BL Lacs and other AGN (1999) (0)
SEST Observations of Southern AGN / Active Galactic Nuclei (1992) (0)
VizieR Online Data Catalog: Radio-loud AGN with relativistic jets (Olguin-Iglesias+, 2016) (2017) (0)
Polarization properties of compact radio sources. (1984) (0)
The research of BL Lacertae objects in Metsähovi Radio Observatory (2006) (0)
Strong flare in the BL Lacertae object 0235+164 at 1-230 GHz in 1997-1998 (1999) (0)
Combining VLBI and Gamma-Ray Satellite Observations in Blazar Research (2004) (0)
UvA-DARE ( Digital Academic Repository ) Optical and near-infrared follow-up observations of GRB 980329 (1998) (0)
VizieR Online Data Catalog: 1Jy northern AGN sample (Planck+, 2016) (2017) (0)
Variability Timescales of Quasars and Bl-Lacertae Objects (1992) (0)
Correlations between the Fermi/LAT gamma-ray and 37 GHz radio properties of AGN averaged over 11 months (2010) (0)
30th Anniversary Workshop of Dodaira Observatory, Japan, 1993 (1993) (0)
Connection Between Jet Parameters and Black Hole Masses in Quasars (2010) (0)
Radio astronomy, Planck, and the evolution of the universe (2013) (0)
High radio frequency studies of equatorial and southern AGN (1996) (0)
The Nuffield Radio Astronomy Laboratories conference, Manchester, July 20-24, 1992 (1993) (0)
Relationships between radio and gamma-ray properties in active galactic nuclei (2008) (0)
Variability of BL Lac objects in the radio regime (1991) (0)
Total flux density radio observations as a tool for understanding AGN behaviour (2007) (0)
Study of a complete sample of radio-bright AGNs: properties of gamma-ray bright and gamma-ray faint radio sources in the first year of Fermi operations (2010) (0)
VizieR Online Data Catalog: AO 0235+164 BVRI photometry (Takalo+ 1998) (1997) (0)
Gamma-ray variations in active galactic nuclei observed with the Compton gamma-ray satellite and the connection to radio outbursts (1997) (0)
Evolutionary relationship between the γ-ray flares and millimeter wave outbursts in PKS 0528+134 (1998) (0)
VizieR Online Data Catalog: AGN Fermi/LAT γ-ray and 37GHz fluxes (Nieppola+, 2011) (2012) (0)
Connection Between Optical and High Frequency Radio Variability in AGN (1994) (0)
Space VLBI and the physics of active galactic nuclei (1991) (0)
The Milliarcsecond structure and evolution of the smallest quasar PKS 0405-385 (2000) (0)
Spectra energy distributions and 37 GHz monitoring of BL Lacertae objects (2006) (0)
Planck satellite: Extragalactic point source science (2005) (0)
Proceedings of the Third Finnish-Soviet Symposium on Radio Astronomy, held at University of Turku, Finland, May 24-25, 1988 (1988) (0)
High-Quality Fast QPOs from Magnetars: An Electric Circuit Model (2011) (0)
SEST observations of extragalactic radio sources at 90 and 230 GHz (1996) (0)
The host galaxies of AGN with powerful relativistic jets (2016) (0)
Observations of a large sample of BL Lac objects at 37 GHz (2007) (0)
Linking the central engine to the jet properties in radio loud AGN (2014) (0)
Target of opportunity multifrequency observations of BL Lac and OJ 287 (1996) (0)
The Metsähovi/Tuorla Planck collaboration: observations and analysis of the data (2004) (0)
The optical infrared and radio light curves of OJ 287 during winter 1993-1994 (1994) (0)
Gamma-ray and radio variations in active galactic nuclei (1997) (0)
Studies of inverted-spectrum radio sources and candidates (2008) (0)
Structure functions applied to the Metsähovi sample. (1992) (0)
Complete samples of radio sources and the classification of active galactic nuclei (1992) (0)
Doppler boosting and orientation effects in BL Lacs and other AGN (1999) (0)
EGRET observations of PKS 0528+134 from 1991 to 1997 (2008) (0)
Northern Hemisphere Survey of Quasar Variability (1992) (0)
URSI/IEEE XXIV Convention on Radio Science. Proceedings. (1999) (0)
Multifrequency radio monitoring of OJ 287 (1996) (0)
An analysis of the mm-radio outbursts in the gamma-ray source PKS 0528 + 134 (1998) (0)
Total intensity radio variations in blazars (2009) (0)
The evolution of the radio spectrum of Quasar OH 471 (Z=3.4); (1994) (0)
Impulsive acceleration during gradual type solar radio flares (1997) (0)
Variability of blazars. Conference in honour of the 100th anniversary of the birth of Yrjö Väisälä. Proceedings. (1992) (0)
Microarcsecond VLBI: What will We See? (1994) (0)
Continuum vs.VLBI: a comparison between data derived from flux monitoring and VLBI observations (1993) (0)
Connection between parsec-scale radio jet and gamma-ray flares in the blazar 1156+295 (2015) (0)
Multi-frequency observations of radio enhanced temperature regions of the Sun (2004) (0)
Simultaneous optical and radio observations of the blazar OJ 287 (1997) (0)
Millimeter-wavelength quiescent spectra and burst behavior for compact extragalactic sources (1990) (0)
Long term continuum monitoring of AGN with the Metsähovi and SEST telescopes (1999) (0)
The effect of wind on cosmic-ray muon asymmetry (1980) (0)
Optical and near-infrared follow-up observations of GRB980329 (1998) (0)
High radio-frequency study of a complete sample of BL Lacertae Objects (2004) (0)
A Simple Method to Analyze Radio Frequency Outbursts of Quasars (1996) (0)
The connection between the parsec-scale radio jet and gamma-r y flares in the blazar 1156 + 295 (2014) (0)
Emission mechanisms in solar flares at millimetre wavelengths (1997) (0)
Locating the gamma-ray emission site in Fermi/LAT blazars from correlation analysis between 37 GHz radio and gamma-ray light curves (2015) (0)
Variability in the Millimeter and Radio Domains (1994) (0)
Long-term variability behaviour of Active Galactic Nuclei (2008) (0)
The effect of the SED shape on the gamma-ray vs. radio emission dependence in AGNs (2002) (0)
Gamma‐ray Emission Mechanism in blazar 3C 279 (2007) (0)
Quick Detection System (QDS) for Planck (2004) (0)
Integral observations of the bright quasar 3C 273 (2004) (0)
UvA-DARE ( Digital Academic Repository ) Optical and near-infrared follow-up observations of GRB (1998) (0)
VizieR Online Data Catalog: Synchrotron peak frequency of 135 AGN (Nieppola+, 2008) (2008) (0)
Multiwavelength flaring of the quasar 3C279 (1997) (0)
Planck Satellite Revisited (2008) (0)
Radio Variability of AGN: Shocks and Unified Models (1992) (0)
Radio Variability of AGN / Active Galactic Nuclei - Shocks and Unified Models (1992) (0)
Long Term Radio Monitoring - Why Do We Need It (2006) (0)
Extragalactic continuum sources. (1989) (0)
IX Russian-Finnish Symposium on Radio Astronomy "Multi-wavelength investigations of solar and stellar activity and active galactic nuclei" (2006) (0)
The radio/gamma-ray connection in AGNs (2000) (0)
Radio to gamma‐ray connection in blazars (2007) (0)
Directivity effects in solar limb flares observed by ground-based and satellite instruments (1997) (0)
Curvature of the CTA 102 jet (2003) (0)
Coordinated Multifrequency Observations of OJ 287 and MK 421 (March 1993) (1994) (0)
Identification of new inverted-spectrum sources (2004) (0)
Relativistic Electrons and Magnetic Fields in Extragalactic Radio Sources (1984) (0)
Rapid Light Variations of Bl-Lacertae (1992) (0)
VizieR Online Data Catalog: Tuorla Quasar Monitoring (Katajainen+ 2000) (1999) (0)
M ay 2 00 7 37 GHz observations of a large sample of BL Lacertae objects (2020) (0)
Structure and Properties of AGN Cores from VLBI and Total Flux Density Variations (1998) (0)
Blazar Radio Variability (1996) (0)
From EGRET to Fermi: mm-radio data and the origin of gamma-ray emission (2010) (0)
Structure Function Analysis Applied to the Metsähovi Sample (1994) (0)
VLBA Monitoring of 3C 273 and 3C 279 During INTEGRAL Campaigns (2004) (0)
Variability time scales from long term monitoring (2006) (0)
Radio spectra and variability of EGRET blazars (2003) (0)
Doppler boosting as the generator of the blazar sequence (2008) (0)
A comparison between the CaII(k 3 ), H α , SOHO/MDI and radio-enhanced temperature regions of the Sun (0)
The Metsähovi-Compton co-operation (1994) (0)
Variability and brightness temperature (2003) (0)
Astronomy in Finland (2004) (0)
Solar rotation rates at high latitudes determined from microwave observations (1996) (0)
P o S ( C M B 2 0 0 6 ) 0 2 6 Quick Detection System for Planck satellite (2006) (0)
A northern 2 Jy sample of compact extragalactic radio sources suitable for millimeter and space VLBI observations (1992) (0)
TeV Observation of BL Lac Objects (2004) (0)
Long Term Monitoring - Why Do We Need It? (2006) (0)
VizieR Online Data Catalog: SEST obs. of extragalactic radiosources (Tornikoski+, 1996) (1996) (0)
Book-Review - Variability of Blazars (1993) (0)
Comparison of Total Flux and VLBI Properties of a Sample of 15 AGN at 22 GHz (1998) (0)
Multiwavelength observations of the February 1996 high-energy flare in the blazar 3C 279 (1997) (0)
Radio and Gamma-Ray Outbursts (1996) (0)
Synchrotron-Self Compton Spectral Evolution of PKS 2155-304 (2014) (0)
The connection between gamma-ray emission and radio flares in Fermi/LAT blazars (2010) (0)
Radio variability of BL Lacs and related objects: Observations vs. shocked jet models (1989) (0)
Radio Observations of OJ 287 (1994) (0)
Time Scale of Radio Sources Activity from the Statistical Model of Variability (1994) (0)
Host galaxies of compact steep spectrum radio sources (2005) (0)
Continuum monitoring of bright quasars (1986) (0)
Ten years monitoring of blasars at Metsähovi (1992) (0)
Variability of blazars : proceedings of a Conference in honour of the 100th anniversary of the birth of Academician Yrjö Väisälä, held at Tuorla Obseratory, University of Turku, Finland, January 6-10, 1991 (1992) (0)
Long term radio time scales of Active Galactic Nuclei (2006) (0)
Variability of 3C273 and Shock Models (1992) (0)
Long Term Monitoring of AGN with the Metsähovi and SEST Telescopes (1994) (0)

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