Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26979
Title: Single-dish and VLBI observations of Cygnus X-3 during the 2016 giant flare episode
Authors: EGRON, ELISE MARIE JEANNE 
Pellizzoni, Alberto 
Giroletti, M. 
Righini, S. 
STAGNI, Matteo 
ORLATI, ANDREA 
Migoni, C. 
Melis, A. 
Concu, R. 
Barbas, L.
BUTTACCIO TARDIO, SALVATORE 
CASSARO, PIETRO ANTONIO 
De Vicente, P.
Gawroński, M. P.
Lindqvist, M.
Maccaferri, G. 
STANGHELLINI, CARLO 
Wolak, P.
Yang, J.
NAVARRINI, Alessandro 
Loru, S. 
PILIA, Maura 
BACHETTI, Matteo 
Iacolina, M. N.
BUTTU, Marco 
Corbel, S.
Rodriguez, J.
Markoff, S.
Wilms, J.
Pottschmidt, K.
Cadolle Bel, M.
Kalemci, E.
BELLONI, Tomaso Maria Melchiorre 
Grinberg, V.
MARONGIU, MARCO 
Vargiu, G. P. 
Trois, A. 
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 471
Issue: 3
First Page: 2703
Abstract: In 2016 September, the microquasar Cygnus X-3 underwent a giant radio flare, which was monitored for 6 d with the Medicina Radio Astronomical Station and the Sardinia Radio Telescope. Long observations were performed in order to follow the evolution of the flare on an hourly scale, covering six frequency ranges from 1.5 to 25.6 GHz. The radio emission reached a maximum of 13.2 ± 0.7 Jy at 7.2 GHz and 10 ± 1 Jy at 18.6 GHz. Rapid flux variations were observed at high radio frequencies at the peak of the flare, together with rapid evolution of the spectral index: α steepened from 0.3 to 0.6 (with Sν ∝ ν^-α) within 5 h. This is the first time that such fast variations are observed, giving support to the evolution from optically thick to optically thin plasmons in expansion moving outward from the core. Based on the Italian network (Noto, Medicina and SRT) and extended to the European antennas (Torun, Yebes, Onsala), very long baseline interferometry (VLBI) observations were triggered at 22 GHz on five different occasions, four times prior to the giant flare, and once during its decay phase. Flux variations of 2 h duration were recorded during the first session. They correspond to a mini-flare that occurred close to the core 10 d before the onset of the giant flare. From the latest VLBI observation we infer that 4 d after the flare peak the jet emission was extended over 30 mas.
URI: http://hdl.handle.net/20.500.12386/26979
URL: https://doi.org/10.1093/mnras/stx1730
ISSN: 0035-8711
DOI: 10.1093/mnras/stx1730
Bibcode ADS: 2017MNRAS.471.2703E
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat
stx1730.pdfPDF editoriale1.07 MBAdobe PDFView/Open
1707.03761.pdf862.24 kBAdobe PDFView/Open
Show full item record

Page view(s)

54
checked on Mar 25, 2023

Download(s)

24
checked on Mar 25, 2023

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE