Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 2013 | Published
Journal Article Open

ALMA: HI and He^+ Lines and Dust in Starbursts, AGN and High-z Galaxies

Abstract

We describe preliminary results for two ALMA projects – 1) imaging the HCN(4-3) line and H26α lines in Arp 220 and 2) measurements of the dust continuum in a sample of 107 high redshift galaxies to probe the evolution of the ISM masses. The HCN observations in Arp 220 at 1/2″ resolution provide the first high resolution imaging of the dense star forming gas in this prototypical ULIRG. The HCN is seen in two clearly delineated, counter-rotating disks. The H26α line is a definitive probe of the star formation rate in Arp 220, avoiding obscuration by dust and contamination by AGN luminosity contributions. In the second project, the remarkable continuum sensitivity of ALMA in Band 7 is used to measure the long wavelength Rayleigh-Jeans tail of the dust emission from a sample of 120 galaxies in COSMOS at z = 0.3 to 2.2, providing estimates for the dust masses and hence their ISM masses. This technique will enable measurements for hundreds of galaxies at high-z with observations of typically ~10 min per galaxy. This is in contrast to CO line imaging which typically requires a few hours per galaxy even with the sensitivity of ALMA. The dust-based mass estimates also avoid the uncertainties associated with the CO-to-H2 conversion factor.

Additional Information

© 2014 International Astronomical Union. Published online: 25 July 2014.

Attached Files

Published - Scoville_2013p173.pdf

Files

Scoville_2013p173.pdf
Files (508.0 kB)
Name Size Download all
md5:510ac5a1cd7be7fc3460ec0ee3cd0f77
508.0 kB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 17, 2023