Results of the summarizing process for the arXiv paper: 2307.15748v1

The z-GAL survey conducted observations of 137 bright Herschel-selected targets using the IRAM Northern Extended Millimeter Array. The main objective was to measure the redshifts of these targets and study their properties. As a result, robust spectroscopic redshifts were obtained for 165 individual galaxies within the redshift range of 0.8<z<6.5. In this particular study, the authors focused on analyzing the millimeter spectra of the z-GAL sources in order to derive their physical properties. Both continuum and line emission were utilized for this purpose. Each source exhibited at least two spectral lines, including transitions of 12CO, [CI], and H2O. The observed line ratios and spectral line energy distributions of individual sources resembled those found in local starbursts. Interestingly, the para-H2O(2_11-2_02) transition was detected in seven sources, following the IR versus H2O luminosity relation observed in sub-millimeter galaxies. The molecular gas mass of the z-GAL sources was determined by examining their 12CO, [CI], and sub-millimeter dust continuum emission. All three tracers yielded consistent results, although the dust continuum showed slightly larger scatter compared to 12CO. Furthermore, by combining information derived from 12CO and the dust continuum, the authors computed the gas-to-dust mass ratio for these sources. The median value obtained was 107 which is similar to that found in star forming galaxies with near solar metallicity. The combined analysis also allowed for estimation of depletion timescales ranging between 0.1 and 1 Gyr for z-GAL sources; placing them between what is known as "main sequence" of star formation and locus representing starbursts. Finally an initial estimate of stellar masses was derived by inverting known gas scaling relations with caveat that gravitational magnification may have influenced results; however it could not be confirmed conclusively due to lack of data available at time when study was conducted . The z-GAL sample was confirmed to be predominantly composed of starbursts although approximately 25% its members were found to lie on main sequence star forming galaxies within range +/- 0.5 dex . Overall this study provides comprehensive analysis physical properties z - GAL sources based on their millimeter spectra findings contribute our understanding galaxy evolution provide valuable insights into nature characteristics these Herschel - selected targets .

• The z-GAL survey observed 137 bright Herschel-selected targets using the IRAM Northern Extended Millimeter Array.
• The main objective was to measure the redshifts of these targets and study their properties.
• Robust spectroscopic redshifts were obtained for 165 individual galaxies within the redshift range of 0.8<z<6.5.
• The millimeter spectra of the z-GAL sources were analyzed to derive their physical properties.
• Both continuum and line emission were utilized for this purpose.
• Each source exhibited at least two spectral lines, including transitions of 12CO, [CI], and H2O.
• The observed line ratios and spectral line energy distributions resembled those found in local starbursts.
• The para-H2O(2_11-2_02) transition was detected in seven sources, following the IR versus H2O luminosity relation observed in sub-millimeter galaxies.
• The molecular gas mass of the z-GAL sources was determined by examining their 12CO, [CI], and sub-millimeter dust continuum emission.
• All three tracers yielded consistent results, with slightly larger scatter in the dust continuum compared to 12CO.
• The gas-to-dust mass ratio for these sources was computed using information derived from 12CO and the dust continuum, with a median value of 107 similar to that found in star forming galaxies with near solar metallicity.
• Depletion timescales ranging between 0.1 and 1 Gyr were estimated for z-GAL sources, placing them between the "main sequence" of star formation and locus representing starbursts.
• An initial estimate of stellar masses was derived by inverting known gas scaling relations, although gravitational magnification may have influenced results without conclusive confirmation due to lack of available data at the time when the study was conducted.
• -The z-GAL sample was confirmed to be predominantly composed of starbursts, with approximately 25% of its members found to lie on the main sequence of star forming galaxies within a range of +/- 0.5 dex.
• This study provides a comprehensive analysis of the physical properties of z-GAL sources based on their millimeter spectra, contributing to our understanding of galaxy evolution and providing valuable insights into the nature and characteristics of these Herschel-selected targets.

The z-GAL survey used a special telescope to look at 137 bright objects in space. They wanted to learn more about these objects and how they behave. They found out that there are 165 individual galaxies within a certain distance range. They studied the light coming from these galaxies to understand what they are made of. They discovered that these galaxies have gas and dust, and they calculated how much of each there is. They also found out that these galaxies are similar to other galaxies in terms of their size and shape. This study helps us learn more about how galaxies change over time. Definitions - Survey: A way of studying or looking at many things all at once. - Telescope: A special tool used to see faraway objects in space. - Galaxies: Huge groups of stars, gas, and dust held together by gravity. - Spectra: The different colors of light that an object gives off. - Gas: A substance like air that can fill up a space. - Dust: Tiny particles like dirt or sand that float in the air."

Exploring the Physical Properties of z-GAL Sources with Millimeter Spectra

The z-GAL survey conducted observations of 137 bright Herschel-selected targets using the IRAM Northern Extended Millimeter Array. The main objective was to measure the redshifts of these targets and study their properties. As a result, robust spectroscopic redshifts were obtained for 165 individual galaxies within the redshift range of 0.8

Observations and Results

Both continuum and line emission were utilized for this purpose. Each source exhibited at least two spectral lines, including transitions of 12CO, [CI], and H2O. The observed line ratios and spectral line energy distributions (SLEDs) of individual sources resembled those found in local starbursts. Interestingly, the para-H2O(2_11-2_02) transition was detected in seven sources, following the IR versus H2O luminosity relation observed in submillimeter galaxies (SMGs).

The molecular gas mass of each z-GAL source was determined by examining their 12CO, [CI], and submillimeter dust continuum emission; all three tracers yielded consistent results although there was slightly larger scatter when it came to dust continuum measurements compared to 12CO data points. Furthermore, by combining information derived from 12CO and dust continuum measurements, an initial estimate of stellar masses could be derived by inverting known gas scaling relations; however it should be noted that gravitational magnification may have influenced results due to lack data available at time when study was conducted .

By combining all three tracers together (12CO + CI + Dust Continuum), a median value for gas-to-dust mass ratio 107 was obtained which is similar to that found in star forming galaxies with near solar metallicity; furthermore depletion timescales ranging between 0.1 - 1 Gyr were also estimated placing them between what is known as "main sequence" star formation locus representing starbursts .

Conclusion

Overall this study provides comprehensive analysis physical properties z - GAL sources based on their millimeter spectra findings contribute our understanding galaxy evolution provide valuable insights into nature characteristics these Herschel - selected targets . The sample was confirmed predominantly composed starbursts although approximately 25% its members were found lie on main sequence star forming galaxies within range +/- 0.5 dex .