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: starburst

Galaxies: groups: individual: IRAS 10597+5926

Galaxies: interactions

Radio lines: galaxies

Galaxies: ISM

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

Netherlands Institute for Radio Astronomy (ASTRON)

University of Groningen

W.J.G. de Blok

University of Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

University of Cape Town

A. M. Kutkin

Netherlands Institute for Radio Astronomy (ASTRON)

Russian Academy of Sciences

D. M. Lucero

Virginia Polytechnic Institute and State University

R. Morganti

Netherlands Institute for Radio Astronomy (ASTRON)

University of Groningen

V. A. Moss

Australia Telescope National Facility

Netherlands Institute for Radio Astronomy (ASTRON)

The University of Sydney

T. Oosterloo

Netherlands Institute for Radio Astronomy (ASTRON)

University of Groningen

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 and Antenna Systems, Antennas

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

University of Amsterdam

Netherlands Institute for Radio Astronomy (ASTRON)

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

University of Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 647 A193

Subject Categories

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

DOI

10.1051/0004-6361/202040019

More information

Latest update

4/22/2021