8C 1221+809 , the SIMBAD biblio

8C 1221+809 , the SIMBAD biblio (119 results) C.D.S. - SIMBAD4 rel 1.8 - 2026.10.14CEST09:28:19

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Bibcode/DOI Score in Title|Abstract|
Keywords 		in a table in teXt, Caption, ... Nb occurence Nb objects in ref Citations
(from ADS) 		Title First 3 Authors
2021AJ....162...21B viz 17       D               5 2594 ~ Optical variability of ICRF3 quasars in the Pan-STARRS 3pi survey with Functional Principal Component Analysis. BERGHEA C.T., MAKAROV V.V., QUIGLEY K., et al.
2012ApJ...757...25L viz 15       D               1 231 7 Gamma-ray loudness, synchrotron peak frequency, and parsec-scale properties of blazars detected by the Fermi Large Area Telescope. LINFORD J.D., TAYLOR G.B. and SCHINZEL F.K.
1996A&AS..115....1S viz 184 23 The current optical identification status of the S5 radio source catalogue. STICKEL M. and KUEHR H.
2001A&A...370...78M viz 164 10 Observations of the bright radio sources in the North Celestial Pole region at the RATAN-600 radio telescope. MINGALIEV M.G., STOLYAROV V.A., DAVIES R.D., et al.
1984MNRAS.211...47S 124 19 Relative orientation of core polarization at lambda 6 cm and the overall radio axes of quasars. SAIKIA D.J. and SHASTRI P.
1995AJ....110..880J viz 632 155 A radio reference frame. JOHNSTON K.J., FEY A.L., ZACHARIAS N., et al.
1983AJ.....88.1126G 75 6 31.4 GHz flux density measurements of a complete sample of sources from the 5 GHz S5 survey. GELDZAHLER B.J. and KUHR H.
1997MNRAS.290..380H 101 35 Redshifts for flat-spectrum radio sources in the second Caltech-Jodrell Bank VLBI sample. HENSTOCK D.R., BROWNE I.W.A., WILKINSON P.N., et al.
1983AJ.....88.1138M 213 20 Arcsecond positions for milliarcsecond VLBI nuclei of extragalactic radio sources. II. 207 sources. MORABITO D.D., PRESTON R.A. and SLADE M.A.
1990MNRAS.245..408S 41 38 A VLA and MERLIN study of extragalactic radio sources with one-sided structure. SAIKIA D.J., JUNOR W., CORNWELL T.J., et al.
2003A&A...403..105F         O           362 48 Selecting stable extragalactic compact radio sources from the permanent astrogeodetic VLBI program. FEISSEL-VERNIER M.
2016A&A...595A...5M viz 16       D               1 2192 40 Gaia Data Release 1. Reference frame and optical properties of ICRF sources. MIGNARD F., KLIONER S., LINDEGREN L., et al.
2011A&A...535A..69N viz 15       D               1 250 21 Correlation between Fermi/LAT gamma-ray and 37 GHz radio properties of northern AGN averaged over 11 months. NIEPPOLA E., TORNIKOSKI M., VALTAOJA E., et al.
2008A&A...484..119B viz 74             C       1 106 41 A multi-epoch VLBI survey of the kinematics of CFJ sources. II. Analysis of the kinematics. BRITZEN S., VERMEULEN R.C., CAMPBELL R.M., et al.
2015AJ....150...58F viz 16       D               1 3421 241 The second realization of the international celestial reference frame by very long baseline interferometry. FEY A.L., GORDON D., JACOBS C.S., et al.
1998MNRAS.300..790W viz 541 128 Interferometer phase calibrations sources - III. The regions +20deg ≤ delB1950 ≤ +35deg and +75deg ≤ delB1950 ≤ +90deg . WILKINSON P.N., BROWNE I.W.A., PATNAIK A.R., et al.
2019A&A...630A.101K viz 16       D               2 3584 ~ Realization of a multifrequency celestial reference frame through a combination of normal equation systems. KARBON M. and NOTHNAGEL A.
2010A&A...512A..74M 355       D S   X         9 10 20 Multifrequency observations of a sample of very low frequency peaked BL Lacertae objects. MASELLI A., MASSARO E., NESCI R., et al.
1990AJ.....99....1K 52 111 Complete samples of radio-selected BL Lac objects. KUHR H. and SCHMIDT G.D.
1995ApJS..100....1H viz 102 88 The second Caltech-Jodrell bank VLBI survey. II. Observations of 102 of 193 sources. HENSTOCK D.R., BROWNE I.W.A., WILKINSON P.N., et al.
1997ApJ...474...47N 4 13 231 A measurement of the angular power spectrum of the anisotropy in the cosmic microwave background. NETTERFIELD C.B., DEVLIN M.J., JAROSIK N., et al.
1997ApJS..111...95F 134 173 VLBA observations of radio reference frame sources. II. Astrometric suitability based on observed structure. FEY A.L. and CHARLOT P.
2013MNRAS.435.2793R 15       D               1 78 3 A 20GHz bright sample for δ > 72° - II. Multifrequency follow-up. RICCI R., RIGHINI S., VERMA R., et al.
2017MNRAS.466.1567L viz 16       D               1 324 1 Test of source selection for constructing a more stable and uniform celestial reference frame. LIU N., LIU J.-C. and ZHU Z.
2018A&A...618A..80G viz 16       D               1 647 ~ Extragalactic radio source stability and VLBI celestial reference frame: insights from the Allan standard deviation. GATTANO C., LAMBERT S.B. and LE BAIL K.
2006A&A...452.1107F         O           272 16 Analysis strategy issues for the maintenance of the ICRF axes. FEISSEL-VERNIER M., MA C., GONTIER A.-M., et al.
2000AJ....119.1470D 316 12 Optical positions for a sample of ICRF sources. DA SILVA NETO D.N., ANDREI A.H., VIEIRA MARTINS R., et al.
1998AJ....116..516M viz 609 623 The International Celestial Reference Frame as realized by very long baseline interferometry. MA C., ARIAS E.F., EUBANKS T.M., et al.
2009A&A...493..317L viz 15       D               267 13 On radio source selection to define a stable celestial frame. LAMBERT S.B. and GONTIER A.-M.
2011A&A...529A..91T viz 15       D               1 563 60 VLBI measurement of the secular aberration drift. TITOV O., LAMBERT S.B. and GONTIER A.-M.
2017ApJS..228...22L viz 16       D               2 1528 2 Korean VLBI Network Calibrator Survey (KVNCS). 1. Source catalog of KVN single-dish flux density measurement in the K and Q bands. LEE J.A., SOHN B.W., JUNG T., et al.
2009RAA.....9..168W 15       D               1 171 19 The debeamed luminosity, sychrotron peak frequency and black hole mass of BL Lac objects. WU Z.-Z., GU M.-F. and JIANG D.-R.
1980AJ.....85..649P 32 89 Compact radio sources with faint components. PERLEY R.A., FOMALONT E.B. and JOHNSTON K.J.
2007A&A...466...63W viz 15       D               173 29 VLBI observations of seven BL Lacertae objects from RGB sample. WU Z., JIANG D.R., GU M., et al.
2014A&A...562A..64W viz 15       D               1 170 6 Why are some BL Lacertaes detected by Fermi, but others not? WU Z., JIANG D., GU M., et al.
2004ARep...48..941T viz 643 7 Construction of a celestial coordinate reference frame from VLBI data. TITOV O.A.
1996ApJS..107...37T 291 139 A complete flux-density-limited VLBI survey of 293 flat-spectrum radio sources. TAYLOR G.B., VERMEULEN R.C., READHEAD A.C.S., et al.
2003ApJ...589..733P viz 180 55 VLBI polarimetry of 177 sources from the Caltech-Jodrell Bank flat-spectrum survey. POLLACK L.K., TAYLOR G.B. and ZAVALA R.T.
2013MNRAS.430.2633X viz 15       D               1 296 10 A new concept of the International Celestial Reference Frame: the epoch ICRF. XU M.H., WANG G.L. and ZHAO M.
2013A&A...553A.122L viz 15       D               1 295 6 Time stability of the ICRF2 axes. LAMBERT S.
2001A&A...375..661G viz 264 23 Stability of the extragalactic VLBI reference frame. GONTIER A.-M., LE BAIL K., FEISSEL M., et al.
1991AJ....101.2266R 102 22 A radio optical reference frame. II. Additional radio and optical source positions in the northern hemisphere. RUSSELL J.L., JOHNSTON K.J., MA C., et al.
2019ApJS..242....5X viz 16       D               1 3393 ~ Structure effects for 3417 Celestial Reference Frame radio sources. XU M.H., ANDERSON J.M., HEINKELMANN R., et al.
2011A&A...529A..16K 15       D               1 72 9 γ-rays in flat-spectrum AGN: revisiting the fast jet hypothesis with the CJF sample. KAROUZOS M., BRITZEN S., WITZEL A., et al.
2007A&A...476..759B viz 15       D               297 24 The soft X-ray properties of AGN from the CJF sample. A correlation analysis between soft X-ray and VLBI properties. BRITZEN S., BRINKMANN W., CAMPBELL R.M., et al.
2007A&A...472..763B viz 15       D               289 19 A multi-epoch VLBI survey of the kinematics of CJF sources. I. Model-fit parameters and maps. BRITZEN S., VERMEULEN R.C., TAYLOR G.B., et al.
2002A&A...381..757L viz 494 57 A new list of extra-galactic radio jets. LIU F.K. and ZHANG Y.H.
1999MNRAS.302L..60S 72 8 Polarization of radio cores as a test of unified schemes. SAIKIA D.J.
2012ApJ...748...68D viz 15       D               2 297 86 Infrared colors of the gamma-ray-detected blazars. D'ABRUSCO R., MASSARO F., AJELLO M., et al.
2017ApJ...835L..30M viz 16       D               1 188 9 Astrometric evidence for a population of dislodged AGNs. MAKAROV V.V., FROUARD J., BERGHEA C.T., et al.
2011MNRAS.410.2113B 40           X         1 18 102 A radio census of binary supermassive black holes. BURKE-SPOLAOR S.
2024A&A...684A..93L viz 18       D               1 520 ~ VLBI position variability of AGNs is inversely correlated with their photometric variability. LAMBERT S. and SECREST N.J.
2017ApJS..233....3T viz 16       D               1 721 23 The VLBA Extragalactic Proper Motion Catalog and a measurement of the secular aberration drift. TRUEBENBACH A.E. and DARLING J.
1985AJ.....90.1599P 1228 160 A VLBI survey at 2.29 GHz. PRESTON R.A., MORABITO D.D., WILLIAMS J.G., et al.
1995MNRAS.277.1477P viz 228 166 A sample-oriented catalogue of BL Lacertae objects. PADOVANI P. and GIOMMI P.
1989JApA...10..203S 38 19 Extragalactic sources with very asymmetric radio structure : VLA and MERLIN observations. SAIKIA D.J., SHASTRI P., CORNWELL T.J., et al.
2009ARep...53..487M 52 3 Spectral characteristics and variability of radio sources near the north celestial pole. MINGALIEV M.G., SOTNIKOVA Y.V., KARDASHEV N.S., et al.
1994ApJS...95..345T viz 193 124 The second Caltech-Jodrell bank VLBI survey. I. Observations of 91 of 193 sources. TAYLOR G.B., VERMEULEN R.C., PEARSON T.J., et al.
2012ApJ...744..177L viz 15       D               1 237 41 Contemporaneous VLBA 5 GHz observations of Large Area Telescope detected blazars. LINFORD J.D., TAYLOR G.B., ROMANI R.W., et al.
2013ApJS..206...12D viz 15       D               3 695 65 Unveiling the nature of unidentified gamma-ray sources. I. A new method for the association of gamma-ray blazars. D'ABRUSCO R., MASSARO F., PAGGI A., et al.
2016AJ....151...79L viz 16       D               1 195 9 IVS observation of ICRF2-Gaia transfer sources. LE BAIL K., GIPSON J.M., GORDON D., et al.
1992A&AS...96..339B 80 18 X-ray observations of flat spectrum radio sources with the HEAO-A, Einstein and EXOSAT observatories. BIERMANN P.L., SCHAAF R., PIETSCH W., et al.
2017AN....338..700M viz 16       D               1 291 ~ Simultaneous spectra and radio properties of BL Lac's. MINGALIEV M.G., SOTNIKOVA Y.V., MUFAKHAROV T.V., et al.
2014ApJS..213....3M viz 15       D               1 28362 27 The Low-frequency Radio Catalog of flat-spectrum sources. MASSARO F., GIROLETTI M., D'ABRUSCO R., et al.
2025A&A...697A..35R 19       D               3 47 ~ Singular spectrum analysis of Fermi-LAT blazar light curves: A systematic search for periodicity and trends in the time domain. RICO A., DOMINGUEZ A., PENIL P., et al.
2014MNRAS.439..690H viz 15       D               1 1318 51 Connection between optical and γ-ray variability in blazars. HOVATTA T., PAVLIDOU V., KING O.G., et al.
2024ApJS..274...28C viz 18       D               1 4336 ~ Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources. CIGAN P., MAKAROV V.V., SECREST N.J., et al.
2020A&A...644A.159C viz 16       D               1 4536 184 The third realization of the International Celestial Reference Frame by very long baseline interferometry. CHARLOT P., JACOBS C.S., GORDON D., et al.
2011ApJ...741...30A viz 15       D               1 600 101 The radio/gamma-ray connection in active galactic nuclei in the era of the Fermi Large Area Telescope. ACKERMANN M., AJELLO M., ALLAFORT A., et al.
2022ApJS..260....4P viz 17       D               1 7976 3 Direction of Parsec-scale Jets for 9220 Active Galactic Nuclei. PLAVIN A.V., KOVALEV Y.Y. and PUSHKAREV A.B.
2024MNRAS.530.2282D 1940 ~ Predicting conditional probability distributions of redshifts of Active Galactic Nuclei using Hierarchical Correlation Reconstruction. DUDA J. and BHATTA G.
2022ApJS..260...53A viz 17       D               1 6710 133 Incremental Fermi Large Area Telescope Fourth Source Catalog. ABDOLLAHI S., ACERO F., BALDINI L., et al.
2011NewA...16..503M viz 15       D               1 803 14 2MASS observation of BL Lac objects II. MAO L.S.
2009A&A...495..691M viz 15       D               2 3199 339 Roma-BZCAT: a multifrequency catalogue of blazars. MASSARO E., GIOMMI P., LETO C., et al.
2012MNRAS.424.2832L viz 15       D               1 1877 43 Application of the Gaussian mixture model in pulsar astronomy – pulsar classification and candidates ranking for the Fermi 2FGL catalogue. LEE K.J., GUILLEMOT L., YUE Y.L., et al.
2019A&A...631A.150M viz 16       D               1 339 ~ The γ-ray sky seen at X-ray energies. I. Searching for the connection between X-rays and γ-rays in Fermi BL Lac objects. MARCHESINI E.J., PAGGI A., MASSARO F., et al.
2014RAA....14.1135F viz 15       D               1 454 19 The lower limit of the Doppler factor for a Fermi blazar sample. FAN J.-H., BASTIERI D., YANG J.-H., et al.
2013ApJ...764..135S viz 15       D               1 373 191 Spectroscopy of the largest ever γ-ray-selected BL Lac sample. SHAW M.S., ROMANI R.W., COTTER G., et al.
2012ApJ...761..125F viz 15       D               2 465 22 The spectral index properties of Fermi blazars. FAN J.H., YANG J.H., YUAN Y.H., et al.
2010ApJ...715..429A viz 15       D               1 812 471 The first catalog of active galactic nuclei detected by the Fermi Large Area Telescope. ABDO A.A., ACKERMANN M., AJELLO M., et al.
2023ApJS..268...23F viz 17       D               1 2708 ~ Characterizing the Emission Region Properties of Blazars. FAN J., XIAO H., YANG W., et al.
2021MNRAS.505.5853G 17       D               2 5834 ~ Artificial Neural Network classification of 4FGL sources. GERMANI S., TOSTI G., LUBRANO P., et al.
2020ApJ...892..105A viz 16       D               1 3421 235 The fourth catalog of active galactic nuclei detected by the Fermi Large Area Telescope. AJELLO M., ANGIONI R., AXELSSON M., et al.
2022ApJS..262...18Y viz 17       D               1 2709 8 The Spectral Energy Distributions for 4FGL Blazars. YANG J.H., FAN J.H., LIU Y., et al.
2018RAA....18...56K viz 16       D               1 1421 3 On the intrinsic shape of the gamma-ray spectrum for Fermi blazars. KANG S.-J., WU Q., ZHENG Y.-G., et al.
2016ApJS..226...20F viz 16       D               1 1394 122 The spectral energy distributions of Fermi blazars. FAN J.H., YANG J.H., LIU Y., et al.
2018ApJS..235...39C viz 16       D               1 1395 63 On the jet properties of γ-ray-loud active galactic nuclei. CHEN L.
2010A&A...518A..10V viz 15       D               1 168913 597 A catalogue of quasars and active nuclei: 13th edition. VERON-CETTY M.-P. and VERON P.
2006A&A...455..773V viz 108223 628 A catalogue of quasars and active nuclei: 12th edition. VERON-CETTY M.-P. and VERON P.
2017ApJ...841..113M viz 16       D               1 2944 1 An investigation of blazars without redshifts: not a missing population at high redshift. MAO P. and URRY C.M.
2015Ap&SS.357...75M viz 16       D               1 3562 223 The 5th edition of the Roma-BZCAT. A short presentation. MASSARO E., MASELLI A., LETO C., et al.
2022A&A...660A..87B viz 17       D               2 6191 10 Machine learning methods for constructing probabilistic Fermi-LAT catalogs. BHAT A. and MALYSHEV D.
2018A&A...619A..23C viz 16       D               1 1351 ~ A MST catalogue of γ-ray source candidates above 10 GeV and at Galactic latitudes higher than 20°. CAMPANA R., MASSARO E. and BERNIERI E.
2017ApJS..232...18A viz 16       D               1584 263 3FHL: the Third Catalog of Hard Fermi-LAT Sources. AJELLO M., ATWOOD W.B., BALDINI L., et al.
2010ApJS..188..405A viz 15       D               1 1513 938 Fermi Large Area Telescope First Source Catalog. ABDO A.A., ACKERMANN M., AJELLO M., et al.
2016ApJ...820....8S viz 16       D               1 3047 91 Classification and ranking of Fermi LAT gamma-ray sources from the 3FGL catalog using machine learning techniques. SAZ PARKINSON P.M., XU H., YU P.L.H., et al.
2011ApJ...743..171A viz 15       D               1 977 589 The second catalog of active galactic nuclei detected by the Fermi large area telescope. ACKERMANN M., AJELLO M., ALLAFORT A., et al.
2022ApJS..263...24A viz 17       D               1 3828 15 The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3. AJELLO M., BALDINI L., BALLET J., et al.
2010A&A...511A..53V viz 15       D               1 107473 39 The SPECFIND V2.0 catalogue of radio cross-identifications and spectra. SPECFIND meets the Virtual Observatory. VOLLMER B., GASSMANN B., DERRIERE S., et al.
2014ApJS..212...15F viz 15       D               1 24788 60 A broadband polarization catalog of extragalactic radio sources. FARNES J.S., GAENSLER B.M. and CARRETTI E.
2014ApJS..215...14D viz 15       D               1 7877 110 The WISE blazar-like radio-loud sources: an all-sky catalog of candidate γ-ray blazars. D'ABRUSCO R., MASSARO F., PAGGI A., et al.
2025ApJS..278...11L 205       D     X         5 1265 ~ Discerning Misclassified Flat-spectrum Radio Quasars from Low-frequency-peaked BL Lacertae Objects. LIANG S., YANG W.G., ZHENG Y.G., et al.
2021A&A...655A..17S viz 17       D               1 338578 3 The SPECFIND V3.0 catalog of radio continuum cross-identifications and spectra: Reaching lower frequencies. STEIN Y., VOLLMER B., BOCH T., et al.
2019ApJS..242....4D viz 16       D               1 9583 45 Two new catalogs of blazar candidates in the WISE Infrared sky. D'ABRUSCO R., ALVAREZ CRESPO N., MASSARO F., et al.
2012ApJS..199...31N viz 15       D               1 2260 1282 Fermi Large Area Telescope second source catalog. NOLAN P.L., ABDO A.A., ACKERMANN M., et al.
2015ApJ...810...14A viz 16       D               1 1890 513 The third catalog of active galactic nuclei detected by the Fermi large area telescope. ACKERMANN M., AJELLO M., ATWOOD W.B., et al.
2022ApJ...925...97P viz 17       D               1 809 5 The Estimation of Fundamental Physics Parameters for Fermi-LAT Blazars. PEI Z., FAN J., YANG J., et al.
2020PASP..132k4102P viz 16       D               1 585 ~ Beamed and unbeamed emission of γ-ray blazars. PEI Z., FAN J., YANG J., et al.
2021MNRAS.505.4726K viz 17       D               1 2157 29 The relativistic jet dichotomy and the end of the blazar sequence. KEENAN M., MEYER E.T., GEORGANOPOULOS M., et al.
2018ApJ...866..137L viz 16       D               1 1032 70 Constraining the limiting brightness temperature and Doppler factors for the largest sample of radio-bright blazars. LIODAKIS I., HOVATTA T., HUPPENKOTHEN D., et al.
2014MNRAS.438.3058R viz 15       D               1 1414 31 Connecting radio variability to the characteristics of gamma-ray blazars. RICHARDS J.L., HOVATTA T., MAX-MOERBECK W., et al.
2017MNRAS.467.4565L viz 16       D               1 1193 4 Bimodal radio variability in OVRO-40 m-monitored blazars. LIODAKIS I., PAVLIDOU V., HOVATTA T., et al.
2015ApJS..217....2M viz 16       D               2 2199 42 Refining the associations of the Fermi large area telescope source catalogs. MASSARO F., D'ABRUSCO R., LANDONI M., et al.
2020ApJS..247...33A viz 16       D               1 5175 880 Fermi Large Area Telescope fourth source catalog. ABDOLLAHI S., ACERO F., ACKERMANN M., et al.
2018ApJS..237...32A viz 16       D               1 2605 130 The search for spatial extension in high-latitude sources detected by the Fermi Large Area Telescope. ACKERMANN M., AJELLO M., BALDINI L., et al.
2015ApJS..218...23A viz 16       D               1 3140 1411 Fermi Large Area Telescope third source catalog. ACERO F., ACKERMANN M., AJELLO M., et al.
2003MNRAS.341....1M viz 15       D               1 10126 328 The Cosmic Lens All-Sky Survey - I. Source selection and observations. MYERS S.T., JACKSON N.J., BROWNE I.W.A., et al.
2018ApJ...861..113D viz 16       D               1 581 11 Astrometric limits on the stochastic gravitational wave background. DARLING J., TRUEBENBACH A.E. and PAINE J.
2009A&A...505..385A viz 15       D               1 99836 35 The large quasar reference frame (LQRF). An optical representation of the ICRS. ANDREI A.H., SOUCHAY J., ZACHARIAS N., et al.

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