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Proposal Identification No.: A3018 Date Received: 2015-Aug-30 21:49:25 Arecibo Observatory William E. Gordon Telescope Observing Time Request COVER SHEET Section I - General Information Submitted for Sep 1 2015. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this project: Additional Hours required to complete project: Minimum Useful Time: Expected Data Storage: Proposal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 138 0 90 minutes less than 100 GB The effect of the group environment on the HI content of nearby galaxies While it has become clear that there is a strong connection between galaxies and their environment, we are still struggling to understand how nurture shapes galaxy evolution, and which are the dominant physical mechanisms involved. Studies of HI in and around galaxies hold the key to reveal the nature and extent of environmental effects, as demonstrated by surveys of galaxy clusters such as Virgo. However, what happens to the gas in the more common group environment is still unclear, because we still lack an HI survey able to probe the gas-poor regime for a statistically significant sample of galaxies in groups. We propose to use Arecibo to measure the HI content of about 200 galaxies in large groups down to the levels of HI depletion observed in Virgo. This survey is uniquely designed to provide the reference sample for studies of gas in group galaxies. Outreach Abstract: Galaxies are collections of hundreds of billions of stars formed out of the gaseous matrix that permeated the early Universe. The observed properties of galaxies are known to depend on their surrounding local environment. However, astronomers are still struggling to understand to what extent galaxy evolution is shaped by nurture, and which are the dominant physical processes involved. The key to resolving this outstanding issue is to study the cold gas component, which is the fuel for star formation, in galaxies across a range of environments. This program combines ground-based visible and space-based ultraviolet surveys (which measure the young and old stars in each galaxy) to observations from the Arecibo radio telescope (which measure the gas content), in order to gain important insights into the physical mechanisms responsible for transforming galaxies in the group environment. Name Barbara Catinella Institution UWA/ICRAR E-mail [email protected] Luca Cortese UWA/ICRAR [email protected] 1 Phone +61 356126 481 Student no no Additional Authors See proposal text This work is not part of a thesis. Remote Observing Request Observer will travel to AO X Remote Observing In Absentia (instructions to operator) Section II - Time Request The following times are in LST. For these observations night-time is required. Begin – End Days Needed at Interval–Interval This Interval 09:30 – 15:30 23 – – – Time Constraints (Must Be Justified in the Proposal Text) We request part of the time be scheduled during the last two weeks of March 2016, corresponding to the spring break periods when members of the Undergraduate ALFALFA Team can travel to Arecibo. Section III - Instruments Needed L-wide Atmospheric Observation Instruments: Special Equipment or setup: none Section IV - RFI Considerations 2 Frequency Ranges Planned 1384-1392 This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz. Section V - Observing List Target List See proposal text. 3