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Published March 20, 2019 | Published + Accepted Version
Journal Article Open

Environmental Effect on the Interstellar Medium in Galaxies across the Cosmic Web at z = 0.73

Abstract

We present new Atacama Large Millimeter Array (ALMA) dust continuum observations of 101 log(M*/M⊙) > 9.5 galaxies in the COSMOS field to study the effect of the environment on the interstellar medium at z ~ 0.7. At this redshift, our targets span a wide range of environments allowing for a diverse sample of galaxies with densities of Σ = 0.16–10.5 Mpc^(−2) (per Δz = 0.024). Using the ALMA observations, we calculate the total interstellar medium (ISM) mass (M_(ISM)) and look for depletion as a function of galaxy density in order to understand the quenching or triggering of star formation in galaxies in different environments. M_(ISM) is found to have a small dependence on the environment, while the depletion timescale remains constant (~200 Myr) across all environments. We find elevated M_(ISM) values at intermediate densities and lower values at high densities compared to low (field) densities. Our observed evolution in gas fraction with density in this single redshift slice is equivalent to the observed evolution with cosmic time over 2–3 Gyr. To explain the change in the gas mass fraction seen in galaxies in intermediate and high densities, these results suggest environmental processes such as mergers and ram pressure stripping are likely playing a role in dense filamentary cluster environments.

Additional Information

© 2019 The American Astronomical Society. Received 2018 September 14; revised 2019 February 13; accepted 2019 February 15; published 2019 March 21. The authors thank the anonymous referee for the suggestions and comments that have significantly improved this manuscript. S.K.B. and A.P. acknowledge support from NASA ADAP 13-0054. S.K.B. is thankful for the North American ALMA Science Center support staff, especially Erica Keller, for all their help with data reduction. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2015.1.00055.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Facilities: ALMA - Atacama Large Millimeter Array, HST - , Herschel - , Spitzer - . Software: astropy (Astropy Collaboration et al. 2013), CASA (McMullin et al. 2007).

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Published - Betti_2019_ApJ_874_53.pdf

Accepted Version - 1902.08216.pdf

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Additional details

Created:
August 19, 2023
Modified:
October 20, 2023