TY - JOUR
T1 - The first ground-based detection of the 752 GHz water line in local ultraluminous infrared galaxies using APEX-SEPIA
AU - Quinatoa, Daysi
AU - Yang, Chentao
AU - Ibar, Edo
AU - Humphreys, Elizabeth
AU - Aalto, Susanne
AU - Barcos-Muñoz, Loreto
AU - González-Alfonso, Eduardo
AU - Impellizzeri, Violette
AU - Jaffe, Yara
AU - Liu, Lijie
AU - Martín, Sergio
AU - Weiss, Axel
AU - Zhang, Zhi Yu
N1 - Publisher Copyright:
© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2024
Y1 - 2024
N2 - We report the first ground-based detection of the water line p-H2O (211–202) at 752.033 GHz in three z
< 0.08 ultraluminous infrared galaxies (ULIRGs): IRAS 06035-7102,
IRAS 17207-0014, and IRAS 09022-3615. Using the Atacama Pathfinder
EXperiment (APEX), with its Swedish-ESO PI Instrument for APEX (SEPIA)
band-9 receiver, we detect this H2O line with overall
signal-to-noise ratios of 8–10 in all three galaxies. Notably, this is
the first detection of this line in IRAS 06035-7102. Our new
APEX-measured fluxes, between 145 and 705 Jy km s−1, are compared with previous values taken from Herschel SPIRE FTS. We highlight the great capabilities of APEX for resolving the H2O
line profiles with high spectral resolutions while also improving by a
factor of two the significance of the detection within moderate
integration times. While exploring the correlation between the p-H2O(211–202)
and the total infrared luminosity, our galaxies are found to follow the
trend at the bright end of the local ULIRG’s distribution. The p-H2O(211–202) line spectra are compared to the mid-J
CO and HCN spectra, and dust continuum previously observed with ALMA.
In the complex interacting system IRAS 09022-3615, the profile of the
water emission line is offset in velocity with respect to the ALMA CO(J =
4–3) emission. For IRAS 17207-0014 and IRAS 06035-7102, the profiles
between the water line and the CO lines are spectroscopically aligned.
This pilot study demonstrates the feasibility of directly conducting
ground-based high-frequency observations of this key water line, opening
the possibility of detailed follow-up campaigns to tackle its nature
AB - We report the first ground-based detection of the water line p-H2O (211–202) at 752.033 GHz in three z
< 0.08 ultraluminous infrared galaxies (ULIRGs): IRAS 06035-7102,
IRAS 17207-0014, and IRAS 09022-3615. Using the Atacama Pathfinder
EXperiment (APEX), with its Swedish-ESO PI Instrument for APEX (SEPIA)
band-9 receiver, we detect this H2O line with overall
signal-to-noise ratios of 8–10 in all three galaxies. Notably, this is
the first detection of this line in IRAS 06035-7102. Our new
APEX-measured fluxes, between 145 and 705 Jy km s−1, are compared with previous values taken from Herschel SPIRE FTS. We highlight the great capabilities of APEX for resolving the H2O
line profiles with high spectral resolutions while also improving by a
factor of two the significance of the detection within moderate
integration times. While exploring the correlation between the p-H2O(211–202)
and the total infrared luminosity, our galaxies are found to follow the
trend at the bright end of the local ULIRG’s distribution. The p-H2O(211–202) line spectra are compared to the mid-J
CO and HCN spectra, and dust continuum previously observed with ALMA.
In the complex interacting system IRAS 09022-3615, the profile of the
water emission line is offset in velocity with respect to the ALMA CO(J =
4–3) emission. For IRAS 17207-0014 and IRAS 06035-7102, the profiles
between the water line and the CO lines are spectroscopically aligned.
This pilot study demonstrates the feasibility of directly conducting
ground-based high-frequency observations of this key water line, opening
the possibility of detailed follow-up campaigns to tackle its nature
KW - Galaxies: ISM
KW - Infrared: galaxies
KW - ISM: molecules
U2 - 10.1093/mnras/stad3441
DO - 10.1093/mnras/stad3441
M3 - Journal article
AN - SCOPUS:85179846472
SN - 0035-8711
VL - 527
SP - 6321
EP - 6331
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -