Detection of H2O and OH+in z > 3 hot dust-obscured galaxies
Journal article, 2021

Aims.
In this paper we present the detection of H2O and OH+ emission in z > 3 hot dust-obscured galaxies (Hot DOGs).
Methods.
Using ALMA Band-6 observations of two Hot DOGs, we detected H2O(202-111) in W0149+2350, and H2O(312-303) and the multiplet OH+(11-01) in W0410-0913. These detections were serendipitous, falling within the side-bands of Band-6 observations aimed to study CO(9-8) in these Hot DOGs. Results.
We find that both sources have luminous H2O emission with line luminosities of LH2O(202-111) > 2.2 × 108Lpdbl and LH2O(312-303) = 8.7 × 108Lpdbl for W0149+2350 and W0410-0913, respectively. The H2O line profiles are similar to those seen for the neighbouring CO(9-8) line, with line widths of full width at half maximum (FWHM) ∼800-1000 km s-1. However, the H2O emission seems to be more compact than the CO(9-8). OH+(11-01) is detected in emission for W0410-0913, with a FWHM = 1000 km s-1 and a line luminosity of LOH+(11-01) = 6.92 × 108Lpdbl. The ratio of the observed H2O line luminosity over the IR luminosity, for both Hot DOGs, is consistent with previously observed star-forming galaxies and active galactic nuclei (AGN). The H2O/CO line ratio of both Hot DOGs and the OH+/H2O line ratio of W0410-0913 are comparable to those of luminous AGN found in the literature. Conclusions.
The bright H2O(202-111), and H2O(312-303) emission lines are likely due to the combined high star formation levels and luminous AGN in these sources. The presence of OH+ in emission, and the agreement of the observed line ratios of the Hot DOGs with luminous AGN in the literature, would suggest that the AGN emission is dominating the radiative output of these galaxies. However, follow-up multi-transition observations are needed to better constrain the properties of these systems.

Galaxies: high-redshift

Galaxies: evolution

Galaxies: active

Galaxies: ISM

Author

Flora Stanley

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Extragalactic Astrophysics

Kirsten Kraiberg Knudsen

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Susanne Aalto

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Lulu Fan

University of Science and Technology of China

Niklas Falstad

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Extragalactic Astrophysics

E. Humphreys

European Southern Observatory Santiago

Atacama Large Millimeter-submillimeter Array (ALMA)

Astronomy and Astrophysics

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

Vol. 646 A178

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

DOI

10.1051/0004-6361/202037888

More information

Latest update

3/18/2021