J/A+A/646/A178 Spectra of 2 z>3 hot dust-obscured galaxies (Stanley+, 2021)
Detection of H2O and OH+ in z>3 hot dust-obscured galaxies.
Stanley F., Knudsen K.K., Aalto S., Fan L., Falstad N., Humphreys E.
<Astron. Astrophys. 646, A178 (2021)>
=2021A&A...646A.178S 2021A&A...646A.178S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Spectra, radio
Keywords: galaxies: high-redshift - galaxies: ISM - galaxies: actives -
galaxy evolution
Abstract:
In this paper we present the detection of H2O and OH+ emission in
z>3 hot dust-obscured galaxies (Hot DOGs).
Using ALMA Band-6 observations of two Hot DOGs, we have 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.
We find that both sources have luminous H2O emission with line
luminosities of LH2O>2.2x108L☉ and LH2O=8.7x108L☉
for W0149+2350 and W0410-0913, respectively. The H2O line profiles
are similar to those seen for the neighbouring CO(9-8) line, with
linewidths of FWHM∼800-1000km/s. However, the H2O emission seems to
be more compact than the CO(9-8). OH+ is detected in emission for
W0410-0913, with a FWHM=1000km/s and a line luminosity of
LOH+=6.92x108L☉. 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 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 in the literature.
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, followup
multi-transition observations are needed to better constrain the
properties of these systems.
Description:
We provide the reduced and continuum subtracted spectra for the
sources presented in this paper, with channel width of 60km/s. The
central velocity is determined based on the line of interest and the
redshift of each source. The spectra were extracted from cubes with
beam sizes of 0.53"x0.32" and 0.67"x0.52" for W0149+2350 and
W0410-0913, respectively.
Objects:
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RA (2000) DE Designation(s)
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01 48 46.16 +23 50 24.6 W0149+2350 = WISE J014946.16+235014.6
04 10 10.60 -09 13 05.2 W0410-0913 = WISE J041010.60-091305.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cow0149.dat 42 76 Extracted CO(9-8) spectrum of W0149+2350
h2ow0149.dat 42 75 Extracted H2O(202-111) spectrum of W0149+2350
cow0410.dat 42 76 Extracted CO(9-8) spectrum of W0410-0913
h2ow0410.dat 42 38 Extracted H2O(202-111) spectrum of W0149+2350
ohpw0410.dat 42 76 Extracted OH+(11-01) spectrum of W0410-0913
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Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 24 F24.18 km/s Vel Velocity
26- 42 F17.14 mJy Flux Flux
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Acknowledgements:
Flora Stanley, flora.stanley(at)chalmers.se
(End) Patricia Vannier [CDS] 08-Dec-2020