Suggested Searches

 

IR STIG PRIMA Seminar

Infrared Science and Technology Interest Group

Over the next few months, our talk series will be highlighting research from PRIMA's Working Groups, with this talk focusing on dust properties in galaxies in the nearby universe.  Stay tuned as well for overview talks this fall that highlight PRIMA's PI science in the areas of Protoplanetary Disks and the Evolution of Dust and Metals. 

IR STIG about IR STIG PRIMA Seminar

Location

Virtual

Dates

22 June 2026
9:00am PT / 12:00pm ET

Community

IR STIG

Type

Seminar

Relations Between Dust Intrinsic Properties, Star Formation, and Galaxy Global / Integrated Quantities in Nearby Galaxies

Speaker

Bogdan Adrian Pastrav, (Institute of Space Science)

Abstract

Results of a case study of a sample of low-redshift galaxies are presented, to determine dust temperatures and emissivity indices through a less time consuming method, and to connect these intrinsic dust properties with global galaxy properties, ISM and star formation quantities. Dust temperatures are determined for two cases – with dust emissivity index a free parameter or fixed, based on the corresponding galaxy dust masses independently calculated in my previous work, without performing a spectral energy distribution (SED) fit of the cold dust emission fluxes. Simultaneously, the dust emissivity indices are determined, and their evolution with temperature quantified. It is investigated whether the dust emissivity index can be predicted from another relation or if it scales with some other integrated dust/ISM or star formation property, which could be used as a proxy. Star formation quantities used were determined previously through a method that avoids the use of a dust attenuation curve or Balmer decrements. Observed relations between dust temperature and emissivity index, the dust surface density and global / integrated galaxy and star formation related quantities are presented and analyzed in the context of dust/ISM formation and evolution. It is verified which of the star formation quantities can constitute conclusive tracers of the dust temperature. The results and conclusions can be relevant for larger-scale studies of low to mid-redshift galaxies at infrared wavelengths, in future surveys such as PRIMA.

Seminar Connection

Please visit the P-CAST webpage https://prima.ipac.caltech.edu/page/p-cast for a link to join and to see all of our upcoming speakers!

News Straight to Your Inbox

Subscribe to your community email news list

We will never share your email address.

Privacy Policy

Sign Up
Angled from the upper left corner to the lower right corner is a cone-shaped orange-red cloud known as Herbig-Haro 49/50. This feature takes up about three-fourths of the length of this angle. The upper left end of this feature has a translucent, rounded end. The conical feature widens slightly from the rounded end at the upper right down to the lower right. Along the cone there are additional rounded edges, like edges of a wave, and intricate foamy-like details, as well as a clearer view of the black background of space. In the upper left, overlapping with the rounded end of Herbig-Haro 49/50, is a background spiral galaxy with a concentrated blue center that fades outward to blend with red spiral arms. The background of space is speckled with some white stars and smaller, more numerous, fainter white galaxies throughout.