VLBI Ecliptic Plane Survey: VEPS-1

Shu, Fengchun; Petrov, Leonid; Jiang, Wu; Xia, Bo; Jiang, Tianyu; Cui, Yuzhu; Takefuji, Kazuhiro; McCallum, J.; Lovell, J. E. J.; Yi, Sang-oh; Hao, Longfei; Yang, Wenjun; Zhang, Hua; Chen, Zhong; Li, Jinling

doi:10.3847/1538-4365/aa71a3

Cited by 27 publications

(15 citation statements)

References 31 publications

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“…For our analysis we use the same 8 GHz VLBI data as in Plavin et al (2020) that are compiled in the Astrogeo 1 database. These observations include geodetic VLBI programs (Petrov et al 2009;Piner et al 2012), the Very Long Baseline 1 http://astrogeo.org/vlbi images/ Array (VLBA) calibrator surveys (VCS; Beasley et al 2002;Fomalont et al 2003;Petrov et al 2005Petrov et al , 2006Kovalev et al 2007;Petrov et al 2008;Petrov 2017;Gordon et al 2016), and other 8 GHz global VLBI, VLBA, EVN (the European VLBI Network), LBA (the Australian Long Baseline Array) observations (Petrov et al 2011a;Petrov 2011;Petrov et al 2011b;Petrov 2012Petrov , 2013Schinzel et al 2015;Shu et al 2017;Petrov et al 2019;Petrov 2020;Popkov et al 2020). The AGN positions are determined from these observations and presented within the VLBI-based Radio Fundamental Catalogue 2 (RFC).…”

Section: Vlbi Observations Of Agnsmentioning

confidence: 99%

Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Plavin,

Kovalev,

Kovalev

et al. 2020

Preprint

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We have shown recently that high-energy neutrinos above 200 TeV detected by IceCube are produced within several parsecs in the central regions of radio-bright active galactic nuclei (AGNs). To independently test this result and to extend the analysis to a wider energy range, we use here public data for all energies from seven years of IceCube observations. The IceCube point-source likelyhood map is analyzed against positions of AGNs from a large complete sample selected by their compact radio flux density. The latter analysis delivers 3.0σ significance with the combined post-trial significance of both studies being 4.1σ. The correlation is driven by a large number of AGNs. Together with fainter but physically similar sources not included in the sample, these radio-bright quasars may explain the entire IceCube astrophysical neutrino flux as derived from muon-track analyses. The neutrinos can be produced in interactions of relativistic protons with X-ray self-Compton photons in parsec-scale AGN jets.

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Section: Vlbi Observations Of Agnsmentioning

confidence: 99%

Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Plavin,

Kovalev,

Kovalev

et al. 2020

Preprint

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“…We should stress that all these listed problems can be solved with existing facilities under dedicated program. At the same time, attempts to add some sources to regular geodetic VLBI observations (Le Bail et al 2016;Shu et al 2017) turned out only partly successful. Improvement of source position coordinates with a pace of 30-100 sources per year is not sufficient to make a noticeable difference.…”

Section: Future Observationsmentioning

confidence: 99%

Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia

Petrov

Kovalev

2017

Monthly Notices of the Royal Astronomical Society

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We interpret the recent discovery of a preferable VLBI/Gaia offset direction for radioloud active galactic nuclei (AGNs) along the parsec-scale radio jets as a manifestation of their optical structure on scales of 1 to 100 milliarcseconds. The extended jet structure affects the Gaia position stronger than the VLBI position due to the difference in observing techniques. Gaia detects total power while VLBI measures the correlated quantity, visibility, and therefore, sensitive to compact structures. The synergy of VLBI that is sensitive to the position of the most compact source component, usually associated with the opaque radio core, and Gaia that is sensitive to the centroid of optical emission, opens a window of opportunity to study optical jets at milliarcsecond resolution, two orders of magnitude finer than the resolution of most existing optical instruments. We demonstrate that strong variability of optical jets is able to cause a jitter comparable to the VLBI/Gaia offsets at a quiet state, i.e. several milliarcseconds. We show that the VLBI/Gaia position jitter correlation with the AGN optical light curve may help to locate the region where the flare occurred, estimate its distance from the super-massive black hole and the ratio of the flux density in the flaring region to the total flux density.

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“…It is not uniform for both all the sources and sources having photometric and redshift data, with a deficit in the southern hemisphere. Additionally, densification of sources near the ecliptic coming from Shu et al (2017) and dispersion of sources near the Galactic plane are observed. A jump in the source distribution at δ ≈ 40 • corresponds to the southern boundary of the declination zone available for the Very Long Baseline Array (VLBA) that provided observations of most astrometric radio sources.…”

Section: General Catalog Descriptionmentioning

confidence: 87%

A New Version of the OCARS Catalog of Optical Characteristics of Astrometric Radio Sources

Malkin

2018

ApJS

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A new version of the Optical Characteristics of Astrometric Radio Sources (OCARS) catalog is presented. This compiled catalog includes radio sources observed in different VLBI programs and experiments that result in source position determination, their redshift, and photometry in the visible and near-infrared bands. A cross-identification table between the OCARS and other catalogs is also provided. The status of the catalog as of 2018 September 7 is described in this paper. The OCARS catalog currently contains 6432 sources, of which 3895 have redshift data and 5479 have photometric data. Compared with the previous version, the current version has been enriched with extended redshift and photometry information, and cross-identification with several catalogs in radio, optical, infrared, ultraviolet, X-ray, and gamma-ray bands. The OCARS catalog is updated every few weeks on average to incorporate new data that appear in the NASA/IPAC Extragalactic Database (NED), SIMBAD database, and in the literature.

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VLBI Ecliptic Plane Survey: VEPS-1

Cited by 27 publications

References 31 publications

Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia

A New Version of the OCARS Catalog of Optical Characteristics of Astrometric Radio Sources

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