Apertif view of the OH Megamaser IRAS 10597+5926: OH 18 cm satellite lines in wide-area HI surveys

Abstract

We present the serendipitous detection of the two main OH maser lines at 1667 and 1665 MHz associated with IRAS 10597+5926 at z = 0.19612 in the untargeted Apertif Wide-area Extragalactic 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/L_Sun) = 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 R_1612 > 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 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(L_TIR/L_Sun) = 12.24, undergoing a star burst with an estimated star formation rate of 179 +/- 40 M_Sun/yr. 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.

arXiv comment9 pages, 4 figures. Accepted for publication in A&A

References in corpus (38)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Star Formation in the Milky Way and Nearby Galaxies
• Calibrating Extinction-Free Star Formation Rate Diagnostics with 33GHz Free-Free Emission in NGC6946
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Dust-Corrected Star Formation Rates of Galaxies. II. Combinations of Ultraviolet and Infrared Tracers
• The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic HI Source Catalog
• The Major and Minor Galaxy Merger Rates at z < 1.5
• SoFiA: a flexible source finder for 3D spectral line data
• Galaxy And Mass Assembly (GAMA): Mid-Infrared Properties and Empirical Relations from $WISE$
• WALLABY -- An SKA Pathfinder HI Survey
• Enhanced sensitivity to time-variation of m_p/m_e in the inversion spectrum of ammonia
• Calibrating Star Formation in WISE using Total Infrared Luminosity
• A Search for OH Megamasers at z > 0.1. III. The Complete Survey
• Constraints on changes in fundamental constants from a cosmologically distant OH absorber/emitter
• HST/WFPC2 Imaging of the QDOT Ultraluminous Infrared Galaxy Sample
• The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies
• The Local Universe as Seen in Far-Infrared and in Far-Ultraviolet: A Global Point of View on the Local Recent Star Formation
• A search for HI absorption in nearby radio galaxies using HIPASS
• Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions
• Constraining the variation of fundamental constants using 18cm OH lines
• Constraining fundamental constant evolution with HI and OH lines
• A Search for OH Megamasers at z > 0.1. II. Further Results
• A Laboratory for Constraining Cosmic Evolution of the Fine Structure Constant: Conjugate 18 cm OH Lines Toward PKS 1413+135 at z=0.2467
• The Effect of 53 micron IR Radiation on 18 cm OH Megamaser Emission
• FLASH Early Science -- Discovery of an intervening HI 21-cm absorber from an ASKAP survey of the GAMA 23 field
• Blind HI and OH absorption line search: first results with MALS and uGMRT processed using ARTIP
• Application of a Bayesian Method to Absorption Spectral-Line Finding in Simulated ASKAP Data
• A Dense Gas Trigger for OH Megamasers
• OH Satellite Line Masers in the Nucleus of NGC253
• OH Satellite Line Masers and an AGN Candidate in M82
• Stringent constraints on fundamental constant evolution using conjugate 18 cm satellite OH lines
• A compact starburst ring traced by clumpy OH megamaser emission
• Mid-infrared properties of OH megamaser host galaxies. II: Analysis and modeling of the maser environment
• Constraints on OH Megamaser Excitation from a Survey of OH Satellite Lines
• Identifying OH Imposters in the ALFALFA Neutral Hydrogen Survey
• A Radio Spectral Line Study of the 2-Jy IRAS-NVSS Sample: Part I

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