Is this project an undergraduate, graduate, or faculty project?
Undergraduate
Project Type
individual
Campus
Daytona Beach
Authors' Class Standing
Sima Vaidya, Senior
Lead Presenter's Name
Sima Vaidya
Lead Presenter's College
DB College of Arts and Sciences
Faculty Mentor Name
Gordon Stacey
Abstract
Submillimeter investigations of far-infrared (FIR) fine structure lines are a useful probe for the study of galaxies and the warm, neutral gas of the interstellar medium (ISM) in the early universe. Fine structure lines of carbon, oxygen, and nitrogen reveal characteristics of the ISM and the star-forming regions in it. The [NII] 205 μm line is used as a tracer of C+ gas due to the very similar critical densities to the [CII] 158 μm line and the fact that the line ratio of [CII]158/[NII]205 in the ionized gas is constant. We used these properties to compute the percentage of ionized and neutral C+ gas in the PDR versus the HII region. We present data for the [NII] 205 μm and [CII] 158 μm line emissions, acquired with the Atacama Large Millimeter/Submillimeter Array (ALMA) telescope, to investigate the star forming properties of lensed, submillimeter galaxies at high redshifts between z~3-5.7. Through data reduction and interpretation, line ratios of 10 or higher were obtained, signifying a higher percentage of neutral [CII] in PDR’s compared to HII region - 65% to 80% of neutral [CII] comes from the PDR’s.
Acknowledgements: Sima Vaidya participated in the summer 2022 REU program at the Cornell Center for Astrophysics and Planetary Science at Cornell University under NSF award NST/AST-1950324. This project makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.00654.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.
Did this research project receive funding support (Spark, SURF, Research Abroad, Student Internal Grants, Collaborative, Climbing, or Ignite Grants) from the Office of Undergraduate Research?
No
The [NII] 205 micron and [CII] 158 micron line emissions of four star forming Submillimeter Galaxies at z∼3-5.7
Submillimeter investigations of far-infrared (FIR) fine structure lines are a useful probe for the study of galaxies and the warm, neutral gas of the interstellar medium (ISM) in the early universe. Fine structure lines of carbon, oxygen, and nitrogen reveal characteristics of the ISM and the star-forming regions in it. The [NII] 205 μm line is used as a tracer of C+ gas due to the very similar critical densities to the [CII] 158 μm line and the fact that the line ratio of [CII]158/[NII]205 in the ionized gas is constant. We used these properties to compute the percentage of ionized and neutral C+ gas in the PDR versus the HII region. We present data for the [NII] 205 μm and [CII] 158 μm line emissions, acquired with the Atacama Large Millimeter/Submillimeter Array (ALMA) telescope, to investigate the star forming properties of lensed, submillimeter galaxies at high redshifts between z~3-5.7. Through data reduction and interpretation, line ratios of 10 or higher were obtained, signifying a higher percentage of neutral [CII] in PDR’s compared to HII region - 65% to 80% of neutral [CII] comes from the PDR’s.
Acknowledgements: Sima Vaidya participated in the summer 2022 REU program at the Cornell Center for Astrophysics and Planetary Science at Cornell University under NSF award NST/AST-1950324. This project makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.00654.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.