Esko Jorma Johannes Valtaoja - Publications

University of Turku, Åbo, Finland 

49 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2015 Ramakrishnan V, Hovatta T, Nieppola E, Tornikoski M, Lähteenmäki A, Valtaoja E. Locating the γ -ray emission site in Fermi/LAT blazars from correlation analysis between 37 GHz radio and γ -ray light curves Monthly Notices of the Royal Astronomical Society. 452: 1280-1294. DOI: 10.1093/Mnras/Stv321  0.815
2014 Ramakrishnan V, León-Tavares J, Rastorgueva-Foi EA, Wiik K, Jorstad SG, Marscher AP, Tornikoski M, Agudo I, Lähteenmäki A, Valtaoja E, Aller MF, Blinov DA, Casadio C, Efimova NV, Gurwell MA, et al. The connection between the parsec-scale radio jet and γ-ray flares in the blazar 1156+295 Monthly Notices of the Royal Astronomical Society. 445: 1636-1646. DOI: 10.1093/Mnras/Stu1873  0.821
2014 Olguín-Iglesias A, León-Tavares J, Chavushyan V, Valtaoja E, Añorve C, Nilsson K, Kotilainen J, Tornikoski M. Linking the central engine to the jet properties in radio loud AGN Iau Symposia. 10: 329-330. DOI: 10.1017/S1743921315002446  0.799
2012 León-Tavares J, Valtaoja E, Giommi P, Polenta G, Tornikoski M, Lähteenmäki A, Gasparrini D, Cutini S. Exploring the Relation between (Sub-)Millimeter Radiation and γ-Ray Emission in Blazars with Planck and Fermi The Astrophysical Journal. 754: 23. DOI: 10.1088/0004-637X/754/1/23  0.757
2011 León-Tavares J, Valtaoja E, Chavushyan VH, Tornikoski M, Anorve C, Nieppola E, Lähteenmäki A. The connection between black hole mass and Doppler boosted emission in BL Lacertae type objects. Monthly Notices of the Royal Astronomical Society. 411: 1127-1136. DOI: 10.1111/J.1365-2966.2010.17740.X  0.748
2011 León-Tavares J, Valtaoja E, Tornikoski M, Lähteenmäki A, Nieppola E. The connection between gamma-ray emission and millimeter flares in Fermi/LAT blazars Astronomy and Astrophysics. 532. DOI: 10.1051/0004-6361/201116664  0.765
2010 Aatrokoski J, Lähteenmäki A, Tornikoski M, Valtaoja E, Maino D, Galeotta S, Zacchei A, Pasian F. Quick Detection System for Planck satellite Monthly Notices of the Royal Astronomical Society. 401: 597-606. DOI: 10.1111/J.1365-2966.2009.15677.X  0.713
2009 Nieppola E, Hovatta T, Tornikoski M, Valtaoja E, Aller MF, Aller HD. Long-term variability of radio-bright BL Lacertae objects Astronomical Journal. 137: 5022-5036. DOI: 10.1088/0004-6256/137/6/5022  0.791
2009 Rastorgueva EA, Wiik K, Savolainen T, Takalo LO, Valtaoja E, Vetukhnovskaya YN, Sokolovsky KV. Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004: I. Inner jet kinematics Astronomy and Astrophysics. 494. DOI: 10.1051/0004-6361:200811425  0.81
2009 Hovatta T, Valtaoja E, Tornikoski M, Lähteenmäki A. Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies Astronomy and Astrophysics. 494: 527-537. DOI: 10.1051/0004-6361:200811150  0.817
2009 Tornikoski M, Torniainen I, Lähteenmäki A, Hovatta T, Nieppola E, Turunen M, Lainela M, Valtaoja E, Aller MF, Aller HD, Mingaliev M, Trushkin S. Long-term radio behaviour of GPS sources and candidates Astronomische Nachrichten. 330: 128-132. DOI: 10.1002/Asna.200811139  0.777
2008 Marscher AP, Jorstad SG, D'Arcangelo FD, Smith PS, Williams GG, Larionov VM, Oh H, Olmstead AR, Aller MF, Aller HD, McHardy IM, Lähteenmäki A, Tornikoski M, Valtaoja E, Hagen-Thorn VA, et al. The inner jet of an active galactic nucleus as revealed by a radio-to-gamma-ray outburst. Nature. 452: 966-9. PMID 18432239 DOI: 10.1038/Nature06895  0.749
2008 Hovatta T, Nieppola E, Tornikoski M, Valtaoja E, Aller MF, Aller HD. Long-term radio variability of AGN: flare characteristics Astronomy and Astrophysics. 485: 51-61. DOI: 10.1051/0004-6361:200809806  0.781
2008 Nieppola E, Valtaoja E, Tornikoski M, Hovatta T, Kotiranta M. Blazar sequence – an artefact of Doppler boosting Astronomy and Astrophysics. 488: 867-872. DOI: 10.1051/0004-6361:200809716  0.755
2007 Nieppola E, Tornikoski M, Lähteenmäki A, Valtaoja E, Hakala T, Hovatta T, Kotiranta M, Nummila S, Ojala T, Parviainen M, Ranta M, Saloranta P, Torniainen I, Tröller M. 37 GHz observations of a large sample of BL Lacertae objects The Astronomical Journal. 133: 1947-1953. DOI: 10.1086/512609  0.807
2007 Hovatta T, Tornikoski M, Lainela M, Lehto HJ, Valtaoja E, Torniainen I, Aller MF, Aller HD. Statistical analyses of long-term variability of AGN at high radio frequencies Astronomy and Astrophysics. 469: 899-912. DOI: 10.1051/0004-6361:20077529  0.791
2007 Lähteenmäki A, Tornikoski M, Hovatta T, Valtaoja E. Total flux density radio observations as a tool for understanding AGN behaviour Astrophysics and Space Science. 311: 347-351. DOI: 10.1007/S10509-007-9569-6  0.846
2006 Angela Osterman M, Miller HR, Campbell AM, Marshall K, Mcfarland JP, Aller H, Aller M, Fried RE, Kurtanidze OM, Nikolashvili MG, Tornikoski M, Valtaoja E. Multiwavelength observations of the extreme X-ray-selected BL Lacertae object PG 1553+11 (1ES 1553+113) Astronomical Journal. 132: 873-882. DOI: 10.1086/505565  0.624
2006 Savolainen T, Wiik K, Valtaoja E, Kadler M, Ros E, Tornikoski M, Aller MF, Aller HD. An extremely curved relativistic jet in PKS 2136+141 Astrophysical Journal. 647: 172-184. DOI: 10.1086/505259  0.801
2006 Savolainen T, Wiik K, Valtaoja E, Tornikoski M. Multifrequency VLBA monitoring of 3C 273 during the INTEGRAL Campaign in 2003 - I. Kinematics of the parsec scale jet from 43 GHz data Astronomy and Astrophysics. 446: 71-85. DOI: 10.1051/0004-6361:20053753  0.765
2006 Lindfors EJ, Türler M, Valtaoja E, Aller H, Aller M, Mazin D, Raiteri CM, Stevens JA, Tornikoski M, Tosti G, Villata M. Synchrotron flaring in the jet of 3C 279 Astronomy and Astrophysics. 456: 895-903. DOI: 10.1051/0004-6361:20053679  0.706
2006 Nieppola E, Tornikoski M, Valtaoja E. Spectral energy distributions of a large sample of BL Lacertae objects Astronomy and Astrophysics. 445: 441-450. DOI: 10.1051/0004-6361:20053316  0.684
2005 Pian E, Foschini L, Beckmann V, Sillanpää A, Soldi S, Tagliaferri G, Takalo L, Barr P, Ghisellini G, Malaguti G, Maraschi L, Palumbo GGC, Treves A, Courvoisier TJ-, Cocco GD, ... ... Valtaoja E, et al. INTEGRAL observations of the field of the BL Lacertae object S5 0716+714 Astronomy and Astrophysics. 429: 427-431. DOI: 10.1051/0004-6361:20041871  0.8
2005 Lindfors EJ, Valtaoja E, Türler M. SSC mechanism in the gamma-ray blazar 3C 279 Astronomy and Astrophysics. 440: 845-853. DOI: 10.1051/0004-6361:20040196  0.647
2003 Lähteenmäki A, Valtaoja E. Testing of Inverse Compton Models for Active Galactic Nuclei with Gamma-Ray and Radio Observations The Astrophysical Journal. 590: 95-108. DOI: 10.1086/374883  0.715
2003 Rantakyrö FT, Wiik K, Tornikoski M, Valtaoja E, Bååth LB. Multifrequency interferometer and radio continuum monitoring observations of CTA 102 Astronomy and Astrophysics. 405: 473-485. DOI: 10.1051/0004-6361:20030579  0.645
2002 Tornikoski M, Lähteenmäki A, Lainela M, Valtaoja E. Possible Identifications for Southern EGRET Sources The Astrophysical Journal. 579: 136-147. DOI: 10.1086/342673  0.816
2002 Savolainen T, Wiik K, Valtaoja E, Jorstad SG, Marscher AP. Connections between millimetre continuum variations and VLBI structure in 27 AGN Astronomy and Astrophysics. 394: 851-861. DOI: 10.1051/0004-6361:20021236  0.818
2002 Hanski MT, Takalo LO, Valtaoja E. Correlated radio and optical variations in a sample of AGN Astronomy and Astrophysics. 394: 17-31. DOI: 10.1051/0004-6361:20020988  0.439
2001 Tornikoski M, Jussila I, Johansson P, Lainela M, Valtaoja E. Radio spectra and variability of gigahertz-peaked spectrum radio sources and candidates The Astronomical Journal. 121: 1306-1318. DOI: 10.1086/319417  0.815
2001 Wiik K, Valtaoja E, Leppänen K. VLBI monitoring of a sample of 15 AGN at 22 GHz I. Data Astronomy and Astrophysics. 380: 72-80. DOI: 10.1051/0004-6361:20011365  0.441
2001 Wiik K, Valtaoja E. The geometry of the universe from high resolution VLBI data of AGN shocks Astronomy and Astrophysics. 366: 1061-1064. DOI: 10.1051/0004-6361:20000285  0.37
2001 Riehokainen A, Urpo S, Valtaoja E, Makarov VI, Makarova LV, Tlatov AG. Millimeter-radio, SOHO/EIT 171 Å features and the polar faculae in the polar zones of the Sun Astronomy and Astrophysics. 366: 676-685. DOI: 10.1051/0004-6361:20000265  0.731
2000 Tornikoski M, Lainela M, Valtaoja E. The high radio frequency spectra and variability of southern flat-spectrum radio sources The Astronomical Journal. 120: 2278-2283. DOI: 10.1086/316809  0.812
2000 Valtaoja E, Teräsranta H, Tornikoski M, Sillanpää A, Aller MF, Aller HD, Hughes PA. Radio monitoring of OJ 287 and binary black hole models for periodic outbursts The Astrophysical Journal. 531: 744-755. DOI: 10.1086/308494  0.76
2000 Hirabayashi H, Edwards PG, Wehrle AE, Unwin SC, Piner BG, Lovell JEJ, Kobayashi H, Okayasu R, Makino F, Kii T, Valtaoja E. The first space VLBI image of 3C279 Advances in Space Research. 26: 689-692. DOI: 10.1016/S0273-1177(99)01192-8  0.387
2000 Tingay SJ, Jauncey DL, Reynolds JE, Tzioumis AK, King EA, Preston RA, Murphy DW, Meier DL, Edwards PG, Lovell JEJ, Hirabayashi H, Kobayashi H, Shibata KM, McCulloch PM, Costa ME, ... ... Valtaoja E, et al. Space VLBI observations of southern hemisphere gamma-ray and non-gamma-ray AGN: First results for PKS 0637-752 Advances in Space Research. 26: 677-680. DOI: 10.1016/S0273-1177(99)01189-8  0.678
1999 Bloom SD, Marscher AP, Moore EM, Gear W, Teräsranta H, Valtaoja E, Aller HD, Aller MF. Multiwaveband observations of quasars with flat radio spectra and strong millimeter-wave emission Astrophysical Journal, Supplement Series. 122: 1-27. DOI: 10.1086/313204  0.503
1999 Valtaoja E, Lähteenmäki A, Teräsranta H, Lainela M. Total Flux Density Variations in Extragalactic Radio Sources. I. Decomposition of Variations into Exponential Flares Astrophysical Journal Supplement Series. 120: 95-99. DOI: 10.1086/313170  0.814
1999 Lähteenmäki A, Valtaoja E. Total Flux Density Variations in Extragalactic Radio Sources. III. Doppler Boosting Factors, Lorentz Factors, and Viewing Angles for Active Galactic Nuclei The Astrophysical Journal. 521: 493-501. DOI: 10.1086/307587  0.668
1999 Lähteenmäki A, Valtaoja E, Wiik K. Total Flux Density Variations in Extragalactic Radio Sources. II. Determining the Limiting Brightness Temperature for Synchrotron Sources The Astrophysical Journal. 511: 112-117. DOI: 10.1086/306649  0.66
1999 Lähteenmäki A, Valtaoja E. Optical Polarization and Imaging of Hot Spots in Radio Galaxies The Astronomical Journal. 117: 1168-1174. DOI: 10.1086/300752  0.619
1998 Takalo LO, Sillanpää A, Valtaoja E, Katajainen S, Nilsson K, Pursimo T, Heinämäki P, Villata M, Raiteri CM, Ghisellini G, Francesco GD, Lanteri L, Chiaberge M, Peila A, Boltwood P, et al. Monitoring of AO 0235+164 during a faint state Astronomy & Astrophysics Supplement Series. 129: 577-582. DOI: 10.1051/Aas:1998205  0.812
1997 Von Montigny C, Aller H, Aller M, Bruhweiler F, Collmar W, Courvoisier TJL, Edwards PG, Fichtel CE, Fruscione A, Ghiselini G, Hartman RC, Johnson WN, Kafatos M, Kh T, Kniffen DA, ... ... Valtaoja E, et al. Multiwavelength observations of 3C 273 in 1993-1995 Astrophysical Journal. 483: 161-177. DOI: 10.1086/304219  0.637
1995 Pian E, Edelson RA, Wagner SJ, Bregman J, George I, Treves A, Wamsteker W, Bock H, Carini M, Courvoisier T, Donahue M, Efimov Y, Filippenko A, Fink HH, Heidt J, ... ... Valtaoja E, et al. Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993 Advances in Space Research. 16: 57-60. DOI: 10.1016/0273-1177(95)00043-E  0.716
1992 Wiren S, Valtaoja E, Terasranta H, Kotilainen J. A complete sample of Northern hemisphere active galactic nuclei : differences in flux and spectra at high radio frequencies The Astronomical Journal. 104: 1009-1017. DOI: 10.1086/116294  0.56
1986 Valtaoja E. Bending of radio trails by galactic winds and rotation Astrophysics and Space Science. 127: 103-116. DOI: 10.1007/Bf00637766  0.447
1985 Valtaoja E, Lehto H, Teerikorpi P, Korhonen T, Valtonen M, Teräsranta H, Salonen E, Urpo S, Tiuri M, Piirola V, Saslaw WC. A 15.7-min periodicity in OJ287 Nature. 314: 148-149. DOI: 10.1038/314148A0  0.801
1984 Valtaoja E. Circular Polarization and the Structure of Compact Extragalactic Radio Sources Astrophysics and Space Science. 100: 227-241. DOI: 10.1007/Bf00651598  0.478
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