IVIA - Ibero-American VLBI Initiative -Progress on the Brazilian side

IVIA is a joint initiative of at least 8 Latin-American countries plus Portugal and Spain to make good use of large telecommunications antennas that are out of service in these countries, because most international communications are now using submarine cables. The first step will be to refurbish the antennas and then to start doing single dish observations of radiosources. In a second step the antennas will be equipped with VLBI (Very Long Base Interferometry) equipment, to establish a VLBI network. This project will be able to effectively promote scientific integration in Ibero-America. The work is starting in several countries; here we present several scientific cases for the use of the antennas, and we report on the first Brasilian activities.

Key words
Ibero-American Initiative; IVIA; Telecommunication Antennas; Radio Astronomy; VLBI

Authorship

JACQUES R.D. LEPINE

Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Rua do Matão 1226, Cidade Universitária, 05508-090 São Paulo, SP, BrazilUniversidade de São PauloBrazilSão Paulo, SP, BrazilUniversidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Rua do Matão 1226, Cidade Universitária, 05508-090 São Paulo, SP, Brazil

https://orcid.org/0000-0002-8969-0313

JEAN PIERRE RAULIN

Universidade Presbiteriana Mackenzie, Rua da Consolação, 930, Consolação, 01302-907 São Paulo, SP, BrazilUniversidade Presbiteriana MackenzieBrazilSão Paulo, SP, BrazilUniversidade Presbiteriana Mackenzie, Rua da Consolação, 930, Consolação, 01302-907 São Paulo, SP, Brazil

https://orcid.org/0000-0002-7501-3231

TANIA DOMINICI

Museu de Astronomia e Ciências Afins, Ministério da Ciência, Tecnologia e Inovações (MAST/MCTI), Rua General Bruce 586, Bairro Imperial de São Cristóvão, 20921-030 Rio de Janeiro, RJ, BrazilMuseu de Astronomia e Ciências AfinsBrazilRio de Janeiro, RJ, BrazilMuseu de Astronomia e Ciências Afins, Ministério da Ciência, Tecnologia e Inovações (MAST/MCTI), Rua General Bruce 586, Bairro Imperial de São Cristóvão, 20921-030 Rio de Janeiro, RJ, Brazil

https://orcid.org/0000-0002-1522-0925

CARLOS GUILLERMO G. DE CASTRO

https://orcid.org/0000-0002-8979-3582

FERNANDO VIRGILIO ROIG

Observatório Nacional (OB/MCTI), Rua General José Cristino, 77, São Cristóvão, 20921-400 Rio de Janeiro, RJ, BrazilObservatório Nacional (OB/MCTI)BrazilRio de Janeiro, RJ, BrazilObservatório Nacional (OB/MCTI), Rua General José Cristino, 77, São Cristóvão, 20921-400 Rio de Janeiro, RJ, Brazil

https://orcid.org/0000-0001-7059-5116

ANDRÉ WIERMANN

https://orcid.org/0000-0001-5153-0886

MARCELO BORGES FERNANDES

https://orcid.org/0000-0001-5740-2914

YASUCHI HADANO

https://orcid.org/0000-0001-9480-6600

FATIMA SALETE CORRERA

Escola Politécnica, Universidade de São Paulo, Av. Prof. Luciano Gualberto, trv. 3, nº 158, 05508-010 São Paulo, SP, BrazilUniversidade de São PauloBrazilSão Paulo, SP, BrazilEscola Politécnica, Universidade de São Paulo, Av. Prof. Luciano Gualberto, trv. 3, nº 158, 05508-010 São Paulo, SP, Brazil

https://orcid.org/0000-0001-7826-088X

WESLEY BECCARO

https://orcid.org/0000-0001-6599-2344

MARCOS AURELIO LUQUEZE

https://orcid.org/0000-0002-5835-4069

ANTONIO SANDRO VERRI

https://orcid.org/0000-0003-2956-3408

DANILO CESAR ZANELLA

https://orcid.org/0000-0003-0343-9062

KARIN MENÉNDEZ-DELMESTRE

Universidade Federal do Rio de Janeiro (UFRJ), Observatório do Valongo, Ladeira Pedro Antônio, 43, 20080-090 Rio de Janeiro, RJ, BrazilUniversidade Federal do Rio de Janeiro (UFRJ)BrazilRio de Janeiro, RJ, BrazilUniversidade Federal do Rio de Janeiro (UFRJ), Observatório do Valongo, Ladeira Pedro Antônio, 43, 20080-090 Rio de Janeiro, RJ, Brazil

https://orcid.org/0000-0003-3153-5123

THIAGO SIGNORINI GONÇALVES

https://orcid.org/0000-0003-2374-366X

ULISSES BARRES DE ALMEIDA

Centro Brasileiro de Pesquisas Físicas (CBPF/MCTI), Rua Dr. Xavier Sigaud, 150, Urca, 22290-180 Rio de Janeiro, RJ, BrazilCentro Brasileiro de Pesquisas Físicas (CBPF/MCTI)BrazilRio de Janeiro, RJ, BrazilCentro Brasileiro de Pesquisas Físicas (CBPF/MCTI), Rua Dr. Xavier Sigaud, 150, Urca, 22290-180 Rio de Janeiro, RJ, Brazil

https://orcid.org/0000-0001-7909-588X

MILITÃO VIEIRA FIGUEREDO

Universidade Federal do Vale do São Francisco (UNIVASF), Av. José de Sá Maniçoba, s/n, Centro, 56304-917 Petrolina, PE, BrazilUniversidade Federal do Vale do São Francisco (UNIVASF)BrazilPetrolina, PE, BrazilUniversidade Federal do Vale do São Francisco (UNIVASF), Av. José de Sá Maniçoba, s/n, Centro, 56304-917 Petrolina, PE, Brazil

https://orcid.org/0000-0003-2784-0678

Correspondence to: Jacques R.D. Lepine E-mail: jacques.lepine@iag.usp.br

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (6)

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Figure 1
The Tanguá 32 m antenna (Rio de Janeiro State), planned to be part of IVIA.

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Figure 2
The position of the main antennas participating in IVIA. In South America, the antena of Paraguay has been added to the original map of IVIA. In Brazil, only the Tanguá antenna is shown, although another antena at Morungaba, São Paulo State, might participate in future. The antena in the ocean is the one of Azores, belonging to Portugal. The Yebes Antenna in Spain is shown in red; it is currently participating in VLBI observations with the European network. Two antennas are shown in Africa, in Ghana (Kuntunse Satellite Earth Station) and South Africa (Hartebeesthoek, near Johanesburg).

Thumbnail

Figure 3
Time variability of two 6.668 GHz methanol masers observed with the 32 m antenna of Torún (Poland) by Olech et al. (2019). The time is indicated in Julian days, the Galactic coordinates of the sources, as well as their velocities with respect to the Local Standard of Rest are indicated inside the figures.

Thumbnail

Figure 4
The spiral arms in the Galactic plane, and the maser sources which had their distances measured by VLBI parallax. The Sun is indicated by a red dot. The quadrants of the Galaxy are indicated by Q1, Q2, etc. (taken from Reid et al. 2019). One can see that there are much less VLBI measurements in Quadrant 3, which would require radiotelescopes in the Southern Sky.

Thumbnail

Figure 5
Light curve of the pulsar PSRJ0030+0451, a very fast pulsar (period 4.8 ms) discovered in 2000 with the Arecibo radio telescope. The main pulse is in the center; two periods are shown along the time axis.

Thumbnail

Figure 6
Technical visit to the Tanguá antenna in “Estacao Terrena da Embratel“ on September 19, 2019.

Figure 1 The Tanguá 32 m antenna (Rio de Janeiro State), planned to be part of IVIA.

Figure 2 The position of the main antennas participating in IVIA. In South America, the antena of Paraguay has been added to the original map of IVIA. In Brazil, only the Tanguá antenna is shown, although another antena at Morungaba, São Paulo State, might participate in future. The antena in the ocean is the one of Azores, belonging to Portugal. The Yebes Antenna in Spain is shown in red; it is currently participating in VLBI observations with the European network. Two antennas are shown in Africa, in Ghana (Kuntunse Satellite Earth Station) and South Africa (Hartebeesthoek, near Johanesburg).

Figure 3 Time variability of two 6.668 GHz methanol masers observed with the 32 m antenna of Torún (Poland) by Olech et al. (2019). The time is indicated in Julian days, the Galactic coordinates of the sources, as well as their velocities with respect to the Local Standard of Rest are indicated inside the figures.

Figure 4 The spiral arms in the Galactic plane, and the maser sources which had their distances measured by VLBI parallax. The Sun is indicated by a red dot. The quadrants of the Galaxy are indicated by Q1, Q2, etc. (taken from Reid et al. 2019). One can see that there are much less VLBI measurements in Quadrant 3, which would require radiotelescopes in the Southern Sky.

Figure 5 Light curve of the pulsar PSRJ0030+0451, a very fast pulsar (period 4.8 ms) discovered in 2000 with the Arecibo radio telescope. The main pulse is in the center; two periods are shown along the time axis.

Figure 6 Technical visit to the Tanguá antenna in “Estacao Terrena da Embratel“ on September 19, 2019.

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IVIA - Ibero-American VLBI Initiative -Progress on the Brazilian side

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[1] Correspondence to: Jacques R.D. Lepine E-mail: jacques.lepine@iag.usp.br