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

Betti, S. K. and Pope, Alexandra and Scoville, N. and Yun, Min S. and Aussel, H. and Kartaltepe, J. and Sheth, K. (2019) Environmental Effect on the Interstellar Medium in Galaxies across the Cosmic Web at z = 0.73. Astrophysical Journal, 874 (1). Art. No. 53. ISSN 1538-4357. doi:10.3847/1538-4357/ab07b3.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Betti, S. K.0000-0002-8667-6428
Pope, Alexandra0000-0001-8592-2706
Scoville, N.0000-0002-0438-3323
Yun, Min S.0000-0001-7095-7543
Aussel, H.0000-0002-1371-5705
Kartaltepe, J.0000-0001-9187-3605
Sheth, K.0000-0002-5496-4118
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).
Group:COSMOS, Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
NASAADAP 13-0054
Associated Universities, Inc.UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: ISM – submillimeter: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20190321-132522003
Persistent URL:
Official Citation:S. K. Betti et al 2019 ApJ 874 53
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94025
Deposited By: Tony Diaz
Deposited On:21 Mar 2019 21:49
Last Modified:16 Nov 2021 17:02

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