At present epochs, stars dominate the baryonic mass of Galaxies, but at early ages the gas which fuels both star formation and AGN accretion must have been dominant. We have used ALMA archive data in the COSMOS 2-deg^2 field to measure the gas masses for samples of 700 and 10,000 galaxies at redshift 0.1 to 6, corresponding to a span of 12 Gyr. The range of measured gas masses is 10^9 - few x 10^11 solar masses -- the latter being ~ 100x that in the Milky Way.
When low- and intermediate-mass stars exhaust their nuclear fuel in their cores, they expand and enter the giant branch in the HR diagram. Eventually, some also ascend the asymptotic giant branch (AGB), potentially leading to planetary nebulae formation. AGB stars dominate the enrichment of several of the pre-biotic elements (e.g. C, N) and are therefore critical to our understanding of Galactic chemical evolution. The evolution of supergiants can provide information on open cluster evolution and star formation history.
239th Meeting - American Astronomical Society (Splinter Session: Mid and Far-IR observations: leveraging science across the spectrum)
Multi-wavelength observations can open up new and unique comparisons between tracers and physical processes. For instance, while mid infrared line observations typically access molecular vibrational transitions, far infrared and (sub-)mm wave lines probe the rotational excitation ladder. Similarly, mid-to-far infrared continuum observations (intensity and polarization) probe the hot and warm dust, respectively, while (sub-)mm wave data are most sensitive to the cold dust.
239th Meeting - American Astronomical Society (Special Session: The extreme ISM in the inner 200 pc of the Galaxy)
The inner galaxy provides a unique environment to study both interstellar medium processes in extreme states and the conditions of active galactic nuclei. The central 200pc of the Milky Way shows high densities, radiation field, cosmic ray fluxes as well as strong magnetic fields. These effects may explain the high rate and special characteristics of galactic center star formation. Energetic events originating in the vicinity of the central black hole shapes the kinematics and structure, especially out of the plane.
The US-German Stratospheric Observatory for Infrared Astronomy (SOFIA), is currently in its 9th observing cycle, and continues to provide to the international community a unique access to the mid- and far-infrared sky. During this Town Hall, the SOFIA Director, Margaret Meixner, and the SOFIA team will report on the status of the observatory, the ongoing Cycle 9 observations including Legacy Programs, the open Cycle 10 Call for Proposals, upcoming community events, as well as the timeline for instrument upgrades and developments.
Understanding mid and far-IR data: This free virtual event is designed for anyone who uses or considers using astronomic mid and far-IR data in their scientific research. Through short lectures based on existing data and scientific results, attendees will be introduced to many of the scientific cases leveraged by such data. Detailed presentations on data analysis considerations specific to this wavelength range, such as atmospheric transmission correction, will be included.