Looking at the Distant Universe with the MeerKAT Array: Discovery of a Luminous OH Megamaser at z > 0.5 - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical journal letters Year : 2022

Looking at the Distant Universe with the MeerKAT Array: Discovery of a Luminous OH Megamaser at z > 0.5

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Marcin Glowacki
  • Function : Author
Jordan D. Collier
  • Function : Author
Amir Kazemi-Moridani
  • Function : Author
Bradley Frank
  • Function : Author
Hayley Roberts
  • Function : Author
Jeremy Darling
  • Function : Author
Hans-Rainer Klöckner
  • Function : Author
Nathan Adams
  • Function : Author
Andrew J. Baker
  • Function : Author
Matthew Bershady
  • Function : Author
Tariq Blecher
  • Function : Author
Sarah-Louise Blyth
  • Function : Author
Rebecca Bowler
  • Function : Author
Barbara Catinella
  • Function : Author
Laurent Chemin
  • Function : Author
Steven M. Crawford
  • Function : Author
Catherine Cress
  • Function : Author
Romeel Davé
  • Function : Author
Roger Deane
  • Function : Author
Erwin de Blok
  • Function : Author
Jacinta Delhaize
  • Function : Author
Kenneth Duncan
  • Function : Author
Ed Elson
  • Function : Author
Sean February
  • Function : Author
Eric Gawiser
  • Function : Author
Peter Hatfield
  • Function : Author
Julia Healy
  • Function : Author
Patricia Henning
  • Function : Author
Kelley M. Hess
  • Function : Author
Ian Heywood
  • Function : Author
Benne W. Holwerda
  • Function : Author
Munira Hoosain
  • Function : Author
John P. Hughes
  • Function : Author
Zackary L. Hutchens
  • Function : Author
Matt Jarvis
  • Function : Author
Sheila Kannappan
  • Function : Author
Neal Katz
  • Function : Author
Dušan Kereš
  • Function : Author
Renée C. Kraan-Korteweg
  • Function : Author
Philip Lah
  • Function : Author
Michelle Lochner
  • Function : Author
Natasha Maddox
  • Function : Author
Sphesihle Makhathini
  • Function : Author
Gerhardt R. Meurer
  • Function : Author
Martin Meyer
  • Function : Author
Danail Obreschkow
  • Function : Author
Se-Heon Oh
  • Function : Author
Tom Oosterloo
  • Function : Author
Joshua Oppor
  • Function : Author
Hengxing Pan
  • Function : Author
D. J. Pisano
  • Function : Author
Nandrianina Randriamiarinarivo
  • Function : Author
Swara Ravindranath
  • Function : Author
Anja C. Schröder
  • Function : Author
Rosalind Skelton
  • Function : Author
Oleg Smirnov
  • Function : Author
Rachel S. Somerville
  • Function : Author
Raghunathan Srianand
  • Function : Author
Lister Staveley-Smith
  • Function : Author
Masayuki Tanaka
  • Function : Author
Mattia Vaccari
  • Function : Author
Marc Verheijen
  • Function : Author
Fabian Walter
  • Function : Author
John F. Wu
  • Function : Author
Martin A. Zwaan
  • Function : Author

Abstract

In the local universe, OH megamasers (OHMs) are detected almost exclusively in infrared-luminous galaxies, with a prevalence that increases with IR luminosity, suggesting that they trace gas-rich galaxy mergers. Given the proximity of the rest frequencies of OH and the hyperfine transition of neutral atomic hydrogen (H I), radio surveys to probe the cosmic evolution of H I in galaxies also offer exciting prospects for exploiting OHMs to probe the cosmic history of gas-rich mergers. Using observations for the Looking At the Distant Universe with the MeerKAT Array (LADUMA) deep H I survey, we report the first untargeted detection of an OHM at z > 0.5, LADUMA J033046.20-275518.1 (nicknamed "Nkalakatha"). The host system, WISEA J033046.26-275518.3, is an infrared-luminous radio galaxy whose optical redshift z ≍ 0.52 confirms the MeerKAT emission-line detection as OH at a redshift z OH = 0.5225 ± 0.0001 rather than H I at lower redshift. The detected spectral line has 18.4σ peak significance, a width of 459 ± 59 km s-1, and an integrated luminosity of (6.31 ± 0.18 [statistical] ± 0.31 [systematic]) × 103 L , placing it among the most luminous OHMs known. The galaxy's far-infrared luminosity L FIR = (1.576 ±0.013) × 1012 L marks it as an ultraluminous infrared galaxy; its ratio of OH and infrared luminosities is similar to those for lower-redshift OHMs. A comparison between optical and OH redshifts offers a slight indication of an OH outflow. This detection represents the first step toward a systematic exploitation of OHMs as a tracer of galaxy growth at high redshifts.
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Dates and versions

insu-03707835 , version 1 (29-06-2022)

Licence

Attribution - CC BY 4.0

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Marcin Glowacki, Jordan D. Collier, Amir Kazemi-Moridani, Bradley Frank, Hayley Roberts, et al.. Looking at the Distant Universe with the MeerKAT Array: Discovery of a Luminous OH Megamaser at z > 0.5. The Astrophysical journal letters, 2022, 931, pp.L7. ⟨10.3847/2041-8213/ac63b0⟩. ⟨insu-03707835⟩
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