2023 HotSci at JHU/STScI

Special Talk

• Special Talks

  Speaker: Abdurro’uf (JHU)
  Title: Spatially resolving properties of galaxies across cosmic time
  Abstract: Understanding how galaxies evolve over cosmic time requires knowledge of not only integrated galaxy properties but also spatially resolved structures within galaxies. The integral field spectroscopy (IFS) surveys have revolutionized the study of galaxy evolution. However, wide-area IFS surveys have been limited to observing local galaxies due to the expensive nature of these observations. In this talk, I will first introduce our pixelized SED fitting (piXedfit) method for measuring spatially resolved properties of galaxies across a wide redshift range using mainly imaging data. This can be a good complement for the IFS observations in the current era of high spatial resolution and deep imaging surveys, in particular with the JWST and HST. Then I will discuss some work that we have been doing on analyzing spatially resolved properties of galaxies from the nearby universe up to z~7 and a possible galaxy merger the MACS0647-JD at z=10.2, resolved with JWST NIRCam. We have been applying our method
  to imaging and IFU data from various surveys and also simulated data of upcoming Euclid and LSST surveys.

  Speaker: Andreea Petric​​​​​​​ (STScI)
  Title: Dancer in the dark: Hiding High Growth in the hosts of obscured AGN​​​​​​​
  Abstract: Most bulge-dominated galaxies host black holes with masses that tightly correlate with the masses of their bulges. This correlation suggests that black holes and their host galaxies may co-evolve or mutually regulate their growth. Therefore, understanding the formation and evolution of black holes is crucial to understanding the formation and evolution of galaxies. Of particular interest is the population of galaxies with active black holes in their nuclei (active galactic nuclei or AGN) that are fully or partially hidden by dust and gas, as those AGN may evolve differently than non-obscured AGN. Several X-ray through Radio imaging missions are geared to detect on the order of 10^5 obscured AGN. To realize the full scientific potential of these surveys, we must examine those objects using spectroscopic techniques to study their reddening properties, star-formation histories, and excitation conditions. With massively multiplexed spectroscopic facilities, we can efficiently measure ionized and hot molecular gas emission lines, probing star formation, AGN feedback, and gas flows in and between galaxies and the circum-galactic medium. These critical studies will shed light on the role of black holes in galaxy evolution during the epoch of peak growth activity.