NOAO >   Observing Info >   Approved Programs >   2019B-0496

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Program Information for 2019B-0496


PI: Ralf Kotulla, U. of Wisconsin, Madison, kotulla@wisc.edu
Address: Department of Astronomy, 475 N Charter St, Madison, WI 53706 USA

CoI: Jay Gallagher, U. of Wisconsin, Madison
CoI: Wilson Liu, WIYN
CoI: Adam Schaefer, U. of Wisconsin, Madison
CoI: Nikki Noughani, U. of Wisconsin, Madison
CoI: Elena D'Onghia, U. of Wisconsin, Madison
CoI: Undergrad X Tbd, U. of Wisconsin, Madison

Title: Galaxies growing up: From fields to groups to clusters

Abstract: This is a re-submission of a proposal awarded in the previous semester. Due to a number of technical issues relating to WIYN (faulty power supply and a non-working UPS kept WIYN from working for time in December 2018) and ODI (loose screw rendering ODI inoperative for all awarded time in December 2018 & January 2019), as well as bad weather (our past observing run in March 2019 was cut short because of a historic snow storm on Kitt Peak, with KP being evacuated and without power) we lost time and thus ask for time to actually obtain the requested observations. We propose to continue to use ODI to obtain deep images of the nearby Cancer and Ursa Major galaxy super groups. The prime target, UMa, is falling towards Virgo and thus is a laboratory for studies of preprocessing. Some properties of cluster galaxies, such as an overall tendency to be dynamically hot, requires a factor that affects some galaxies before they enter the cluster. This is usually understood in terms of pre-processing, environmental factors that impact galaxies as they are infalling to clusters. Although the details of pre-processing are yet to be clearly identified, it most likely takes the form of galaxy-galaxy and galaxy-group interactions as galaxy groups approach clusters. Our project thus focuses on detecting and mapping stellar debris associated with interactions in the UMa super group and dwarf galaxy properties to place constraints on preprocessing of dwarf and giant galaxies. Our ODI runs in March and April 2018 successfully revealed the properties of several interactions, thereby establishing the feasibility of this project. We now request time to extend our imaging to a more members and a larger area of the UMa super group as well as the poorly studied Cancer cluster.

Program Type: WTAC

Scheduled Nights:
Run 1 (2019B):  WIYN/ODI -- 3n on Dec 27 - Dec 28 2019, Jan 30 - Jan 31 2020


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