Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2016Spring/CatinellatagA3018.pdf Дата изменения: Tue Sep 15 04:38:04 2015 Дата индексирования: Mon Apr 11 17:39:20 2016 Кодировка: Поисковые слова: universe

Proposal Identification No.:

A3018 Arecibo Observatory

Date Received: 2015-Aug-30 21:49:25 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 pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal 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 Luca Cortese

Institution UWA/ICRAR UWA/ICRAR

E-mail barbara.catinella@uwa.edu.au luca.cortese@uwa.edu.au 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 I I - Time Request
The following times are in LST. For these observations night-time is required.

Begin ­ End Interval­Interval 09:30 ­ 15:30 ­ ­ ­

Days Needed at This Interval 23

Time Constraints (Must Be Justified in the Prop osal 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 I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial 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