Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
A low-frequency study of recently identified double-double radio galaxies
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik. Indian Inst Astrophys, Bangalore 560034, Karnataka, India.
IUCAA, Post Bag 4, Pune 411007, Maharashtra, India.;TIFR, Natl Ctr Radio Astrophys, Post Bag 3, Pune 411007, Maharashtra, India..
IUCAA, Post Bag 4, Pune 411007, Maharashtra, India..
IUCAA, Post Bag 4, Pune 411007, Maharashtra, India.;Leiden Univ, Liden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands..
Visa övriga samt affilieringar
2019 (Engelska)Ingår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 486, nr 4, s. 5158-5170Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In order to understand the possible mechanisms of recurrent jet activity in radio galaxies and quasars, which are still unclear, we have identified such sources with a large range of linear sizes (220-917 kpc), and hence timescales of episodic activity. Here we present high-sensitivity 607-MHz Giant Metrewave Radio Telescope (GMRT) images of 21 possible double-double radio galaxies (DDRGs) identified from the FIRST survey to confirm their episodic nature. These GMRT observations show that none of the inner compact components suspected to be hotspots of the inner doubles are cores having a flat radio spectrum, confirming the episodic nature of these radio sources, We have identified a new DDRG with a candidate quasar, and have estimated the upper spectral age limits for eight sources which showed marginal evidence of steepening at higher frequencies. The estimated age limits (11-52 Myr) are smaller than those of the large-sized (similar to 1 Mpc) DDRGs.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2019. Vol. 486, nr 4, s. 5158-5170
Nyckelord [en]
galaxies: active, galaxies: evolution, galaxies. jets, galaxies: nuclei, (galaxies.) quasars: supermassive black holes, radio continuum: galaxies.
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-255573DOI: 10.1093/mnras/stz1184ISI: 000474908200053Scopus ID: 2-s2.0-85068008633OAI: oai:DiVA.org:kth-255573DiVA, id: diva2:1340135
Anmärkning

QC 20190802

Tillgänglig från: 2019-08-02 Skapad: 2019-08-02 Senast uppdaterad: 2019-08-02Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Nandi, SumanaLarsson, Josefin

Sök vidare i DiVA

Av författaren/redaktören
Nandi, SumanaLarsson, Josefin
Av organisationen
Partikel- och astropartikelfysik
I samma tidskrift
Monthly notices of the Royal Astronomical Society
Fysik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 73 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf