Preliminary Science with the COSMOS HI Large Extragalactic Survey (CHILES)
Abstract
An enduring question in galaxy evolution concerns how galaxies obtain cold neutral gas--the fuel for ongoing star formation. To address this, we utilize the COSMOS HI Large Extragalactic Survey (CHILES), a project currently underway on the Jansky Very Large Array (VLA). The CHILES collaboration has been granted 1000 hours of B-array observing time to image neutral hydrogen (HI) and obtain a simultaneous deep continuum image in a 30' x 30' cone centered on the COSMOS field, covering a redshift range of 0 < z < 0.45. We present here an early science case for both the spectral line and continuum data. From the first 180 hours of data, we have performed a kinematic study on the nearest galaxies (z < 0.1) accompanied by complementary optical long slit data, finding mostly regular rotation but at times interesting morphology or kinematics in the neutral or ionized gas. Using the continuum data, we have performed initial experiments in searching for HI absorption through stacking background sources. We expect further interesting results upon completion of data collection in spring 2019.
- Publication:
-
American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23336316D