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Sökning: onr:"swepub:oai:research.chalmers.se:668b4984-aa0d-4536-a56e-653860d5dc42" > PKS 1413+135: OH an...

  • Combes, FrançoiseObservatoire de Paris,Paris Observatory (författare)

PKS 1413+135: OH and H i at z = 0.247 with MeerKAT

  • Artikel/kapitelEngelska2023

Förlag, utgivningsår, omfång ...

  • 2023-03-03
  • EDP Sciences,2023
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:668b4984-aa0d-4536-a56e-653860d5dc42
  • https://doi.org/10.1051/0004-6361/202245482DOI
  • https://research.chalmers.se/publication/535036URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • The BL Lac object PKS 1413+135 was observed by the Large Survey Project MeerKAT Absorption Line Survey (MALS) in the L-band, at 1139 MHz and 12931379 MHz, targeting the HI and OH lines in absorption at z=0.24671. The radio continuum might come from the nucleus of the absorbing galaxy or from a background object at redshift lower than 0.5, as suggested by the absence of gravitational images. The HI absorption line is detected at a high signal-To-noise ratio, with a narrow central component, and with a red wing, confirming previous results. The OH 1720 MHz line is clearly detected in (maser) emission, peaking at a velocity shifted by-10 to-15 km s-1 with respect to the HI peak. The 1612 MHz line is lost due to radio frequency interference. The OH 1667 MHz main line is tentatively detected in absorption, but not the 1665 MHz line. Over 30 years a high variability is observed in optical depths, due to the rapid changes of the line of sight caused by the superluminal motions of the radio knots. The HI line has varied by 20% in depth, while the OH-1720 MHz depth has varied by a factor of ∼3. The position of the central velocity and the widths also varied. The absorbing galaxy is an early-Type spiral (maybe S0) seen edge-on, with a prominent dust lane, covering the whole disk. Given the measured mass concentration and the radio continuum size at centimeter wavelengths (100 mas corresponding to 400 pc at z=0.25), the width of the absorption lines from the nuclear regions are expected up to 250 km s-1. The narrowness of the observed lines (< 15 km s-1) suggests that the absorption comes from an outer gas ring, as frequently observed in S0 galaxies. The millimetric lines are even narrower (< 1 km s-1), which corresponds to the continuum size restricted to the core. The radio core is covered by individual 1 pc molecular clouds, whose column density is a few 1022 cm-2, which is compatible with the gas screen detected in X-rays.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Gupta, NeerajInter-University Centre for Astronomy and Astrophysics (IUCAA) (författare)
  • Muller, Sebastien,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mullers (författare)
  • Balashev, S.National Research University Higher School of Economics (författare)
  • Deka, Partha P.Inter-University Centre for Astronomy and Astrophysics (IUCAA) (författare)
  • Emig, K.L.National Radio Astronomy Observatory (författare)
  • Klockner, H. R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (författare)
  • Klutse, D.University of KwaZulu-Natal (författare)
  • Knowles, K.University of KwaZulu-Natal (författare)
  • Mohapatra, AbhisekInter-University Centre for Astronomy and Astrophysics (IUCAA) (författare)
  • Momjian, E.National Radio Astronomy Observatory Socorro (författare)
  • Noterdaeme, P.Universidad de Chile (UCH),University of Chile (UCH),Centre national de la recherche scientifique (CNRS) (författare)
  • Petitjean, PatrickCentre national de la recherche scientifique (CNRS) (författare)
  • Salas, P.Green Bank Observatory (författare)
  • Srianand, R.Inter-University Centre for Astronomy and Astrophysics (IUCAA) (författare)
  • Wagenveld, Jonah D.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (författare)
  • Observatoire de ParisInter-University Centre for Astronomy and Astrophysics (IUCAA) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences6710004-63611432-0746

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