A novel high-<i>z</i> submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot

ABSTRACT We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5–0.1 arcsec) for 16 bright southern Herschel sources at $1.5 \lt z \lt 4.2$. With only six and a half hours of observations, we reveal 66 spectral lines in 17 galaxies. These observations detect emission from CO (3−2) to CO(18−17), as well as atomic ([C i](1−0), (2−1), [O i] 145 $\mu$m and [N ii] 205 $\mu$m) lines. Additional molecular lines are seen in emission (${\rm H_2O}$ and ${\rm H_2O^+}$) and absorption (OH$^+$ and CH$^+$). The morphologies based on dust continuum ranges from extended sources to strong lensed galaxies with magnifications between 2 and 30. CO line transitions indicate a diverse set of excitation conditions with a fraction of the sources ($\sim 35$ per cent) showcasing dense, warm gas. The resolved gas to star formation surface densities vary strongly per source, and suggest that the observed diversity of dusty star-forming galaxies could be a combination of lensed, compact dusty starbursts and extended, potentially merging galaxies. The predicted gas depletion time-scales are consistent with 100 Myr to 1 Gyr, but require efficient fuelling from the extended gas reservoirs onto the more central starbursts, in line with the Doppler-shifted absorption lines that indicate inflowing gas for two out of six sources. This pilot paper explores a successful new method of observing spectral lines in large samples of galaxies, supports future studies of larger samples, and finds that the efficiency of this new observational method will be further improved with the planned ALMA Wideband Sensitivity Upgrade.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-10-23
DOI
https://doi.org/10.1093/mnras/stae2409
Citations
3
Primary Topic
Astronomy and Astrophysical Research
Type
article
Field-Weighted Citation Impact
1.52

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article

A novel high-z submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot

L. Marchetti, C. Yang, P. Andreani, D. Scott et al.
3 citations
Monthly Notices of the Royal Astronomical Society
Astronomy and Astrophysical Research
1.52
article

A novel high-z submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot

L. Marchetti, C. Yang, P. Andreani, D. Scott, Yoichi Tamura, S. Urquhart, Kevin C. Harrington, Jorge A. Zavala, Dominik A. Riechers, A. Omont, Patrick S. Kamieneski, P. Temi, R. Neri, K. K. Knudsen, E. Borsato, Ikki Mitsuhashi, S. Serjeant, Takafumi Tsukui, Hiddo Algera, R. J. Ivison, M. Negrello, G. J. Bendo, P. van der Werf, Ryota Ikeda, Asantha Cooray, S. Berta, Aristeidis Amvrosiadis, Masato Hagimoto, Tom J. L. C. Bakx, P. Cox, Chen Xu, L. Bonavera, G. de Zotti, S. Eales, J. González-Nuevo
article en
3 citations

Abstract

ABSTRACT We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5–0.1 arcsec) for 16 bright southern Herschel sources at $1.5 \lt z \lt 4.2$. With only six and a half hours of observations, we reveal 66 spectral lines in 17 galaxies. These observations detect emission from CO (3−2) to CO(18−17), as well as atomic ([C i](1−0), (2−1), [O i] 145 $\mu$m and [N ii] 205 $\mu$m) lines. Additional molecular lines are seen in emission (${\rm H_2O}$ and ${\rm H_2O^+}$) and absorption (OH$^+$ and CH$^+$). The morphologies based on dust continuum ranges from extended sources to strong lensed galaxies with magnifications between 2 and 30. CO line transitions indicate a diverse set of excitation conditions with a fraction of the sources ($\sim 35$ per cent) showcasing dense, warm gas. The resolved gas to star formation surface densities vary strongly per source, and suggest that the observed diversity of dusty star-forming galaxies could be a combination of lensed, compact dusty starbursts and extended, potentially merging galaxies. The predicted gas depletion time-scales are consistent with 100 Myr to 1 Gyr, but require efficient fuelling from the extended gas reservoirs onto the more central starbursts, in line with the Doppler-shifted absorption lines that indicate inflowing gas for two out of six sources. This pilot paper explores a successful new method of observing spectral lines in large samples of galaxies, supports future studies of larger samples, and finds that the efficiency of this new observational method will be further improved with the planned ALMA Wideband Sensitivity Upgrade.

Monthly Notices of the Royal Astronomical SocietyVol. 535(2)
Hiroshima University (JP), Australian National University (AU), Leiden University (NL), Ames Research Center (US), Centre National de la Recherche Scientifique (FR), Dublin Institute For Advanced Studies (IE), European Southern Observatory (DE), University of British Columbia (CA), University of Cape Town (ZA), Universidad de Oviedo (ES), University of Cologne (DE), Durham University (GB), The Graduate University for Advanced Studies, SOKENDAI (JP), The Open University (GB), University of California, Irvine (US), Astronomical Observatory of Rome (IT), Institut d'Astrophysique de Paris (FR), University of Manchester (GB), Sorbonne Université (FR), Institut de Radioastronomie Millimétrique (FR), Royal Observatory (GB), EarthTech International (United States) (US), Istituto di Radioastronomia di Bologna (IT), European Southern Observatory (CL), ARC Centre of Excellence for All-sky Astrophysics (AU), Osservatorio Astronomico di Padova (IT), National Astronomical Observatory of Japan (JP), Arizona State University (US), Nagoya University (JP), Chalmers University of Technology (SE), The University of Tokyo (JP), Cardiff University (GB), Netherlands Institute for Radio Astronomy (NL), University of Edinburgh (GB)
Japan Society for the Promotion of Science London, European Commission, Knut och Alice Wallenbergs Stiftelse, National Astronomical Observatory of Japan, Science and Technology Facilities Council
Openalex Percentile: Top 15%
Astronomy and Astrophysical Research
1.52
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