Apertif view of the OH megamaser IRAS 10597+5926: OH 18 cm satellite lines in wide-area H i surveys
Journal article, 2021
We present the serendipitous detection of the two main OH maser lines at 1667 and 1665 MHz associated with IRAS 10597+5926 at zpdbl = 0.19612 in the untargeted Apertif Wide-area Extragalactic imaging Survey (AWES), and the subsequent measurement of the OH 1612 MHz satellite line in the same source. With a total OH luminosity of log(L/Lpdbl ) = 3.90 ± 0.03, IRAS 10597+5926 is the fourth brightest OH megamaser (OHM) known. We measure a lower limit for the 1667/1612 ratio of R1612 > 45.9, which is the highest limiting ratio measured for the 1612 MHz OH satellite line to date. OH satellite line measurements provide a potentially valuable constraint by which to compare detailed models of OH maser pumping mechanisms. Optical imaging shows that the galaxy is likely a late-stage merger. Based on published infrared and far ultraviolet fluxes, we find that the galaxy is an ultra-luminous infrared galaxy (ULIRG) with log(LTIR/Lpdbl) = 12.24 that is undergoing a starburst with an estimated star formation rate of 179 ± 40 Mpdbl yr-1. These host galaxy properties are consistent with the physical conditions responsible for very bright OHM emission. Finally, we provide an update on the predicted number of OH masers that may be found in AWES and estimate the total number of OH masers that will be detected in each of the individual main and satellite OH 18 cm lines.
Galaxies: ISM
Galaxies: starburst
Galaxies: interactions
Radio lines: galaxies
Galaxies: groups: individual: IRAS 10597+5926
Masers
Author
K. M. Hess
Netherlands Institute for Radio Astronomy (ASTRON)
University of Groningen
H. Roberts
University of Colorado at Boulder
H. Dénes
Netherlands Institute for Radio Astronomy (ASTRON)
B. Adebahr
Ruhr-Universität Bochum
J. Darling
University of Colorado at Boulder
E. A.K. Adams
University of Groningen
Netherlands Institute for Radio Astronomy (ASTRON)
W.J.G. de Blok
Netherlands Institute for Radio Astronomy (ASTRON)
University of Cape Town
University of Groningen
A. M. Kutkin
Russian Academy of Sciences
Netherlands Institute for Radio Astronomy (ASTRON)
D. M. Lucero
Virginia Polytechnic Institute and State University
R. Morganti
Netherlands Institute for Radio Astronomy (ASTRON)
University of Groningen
V. A. Moss
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
The University of Sydney
Netherlands Institute for Radio Astronomy (ASTRON)
T. Oosterloo
University of Groningen
Netherlands Institute for Radio Astronomy (ASTRON)
R. Schulz
Netherlands Institute for Radio Astronomy (ASTRON)
J. M. van der Hulst
University of Groningen
A. H.W.M. Coolen
Netherlands Institute for Radio Astronomy (ASTRON)
Sieds Damstra
Netherlands Institute for Radio Astronomy (ASTRON)
Marianna Ivashina
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
G. M. Loose
Netherlands Institute for Radio Astronomy (ASTRON)
Y. Maan
University of Amsterdam
Netherlands Institute for Radio Astronomy (ASTRON)
Mika
Netherlands Institute for Radio Astronomy (ASTRON)
H. Mulder
Netherlands Institute for Radio Astronomy (ASTRON)
M. J. Norden
Netherlands Institute for Radio Astronomy (ASTRON)
L. C. Oostrum
University of Amsterdam
Netherlands Institute for Radio Astronomy (ASTRON)
Mark Ruiter
Netherlands Institute for Radio Astronomy (ASTRON)
J. Van Leeuwen
Netherlands Institute for Radio Astronomy (ASTRON)
University of Amsterdam
N. Vermaas
Netherlands Institute for Radio Astronomy (ASTRON)
D. Vohl
Netherlands Institute for Radio Astronomy (ASTRON)
S. J. Wijnholds
Netherlands Institute for Radio Astronomy (ASTRON)
J. Ziemke
Netherlands Institute for Radio Astronomy (ASTRON)
University of Groningen
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 647 A193Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
DOI
10.1051/0004-6361/202040019