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PKS 1413+135: OH an...
PKS 1413+135: OH and H i at z = 0.247 with MeerKAT
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- Combes, Françoise (author)
- Observatoire de Paris,Paris Observatory
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- Gupta, Neeraj (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Balashev, S. (author)
- National Research University Higher School of Economics
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- Deka, Partha P. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Emig, K.L. (author)
- National Radio Astronomy Observatory
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- Klockner, H. R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Klutse, D. (author)
- University of KwaZulu-Natal
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- Knowles, K. (author)
- University of KwaZulu-Natal
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- Mohapatra, Abhisek (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Momjian, E. (author)
- National Radio Astronomy Observatory Socorro
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- Noterdaeme, P. (author)
- Universidad de Chile (UCH),University of Chile (UCH),Centre national de la recherche scientifique (CNRS)
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- Petitjean, Patrick (author)
- Centre national de la recherche scientifique (CNRS)
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- Salas, P. (author)
- Green Bank Observatory
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- Srianand, R. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Wagenveld, Jonah D. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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(creator_code:org_t)
- 2023-03-03
- 2023
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 671
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https://research.cha... (primary) (free)
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Fjärranalysteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Remote Sensing (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Quasars: Absorption lines
- BL Lacertae objects: individual: PKS1413+135
- Galaxies: general
- Galaxies: ISM
- Galaxies: kinematics and dynamics
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Combes, François ...
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Gupta, Neeraj
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Muller, Sebastie ...
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Balashev, S.
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Deka, Partha P.
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Emig, K.L.
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show more...
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Klockner, H. R.
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Klutse, D.
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Knowles, K.
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Mohapatra, Abhis ...
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Momjian, E.
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Noterdaeme, P.
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Petitjean, Patri ...
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Salas, P.
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Srianand, R.
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Wagenveld, Jonah ...
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Environmental En ...
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and Remote Sensing
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Astronomy and As ...
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Chalmers University of Technology