School of Astronomy (SoA) - Weekly Seminar

H-ATLAS: The environment and characteristics of low redshift galaxies detected by Herschel

Ali Dariush  (School of Astronomy - IPM)

Abstract:

We investigate the ultraviolet and optical properties and environment of low redshift galaxies detected in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) science demonstration data. We use the Sloan Digital Sky Survey seventh release and the Galaxy And Mass Assembly database to select galaxies with r_Petro<19.0 mag in the red-shift range 0.02<z<0.2 and look for their submillimetre counterparts in H-ATLAS. Our results show that at low redshift, H-ATLAS detects mainly blue/star-forming galaxies with a minor contribution from red spirals which are highly obscured/edge-on systems. In addition we find that the colour of a galaxy rather than the local density of its environment determines whether it is detectable by H-ATLAS. The average dust temperature of galaxies that are simul-taneously detected by both PACS and SPIRE is 25 ± 4 K, independent of environment. This analysis provides a glimpse of the potential of H-ATLAS data to investigate the submillimeter properties of galaxies in the local universe.

Wednesday / 12-January-2011 / 22-Dey-1389/ 2:00 PM

IPM Larak Building-School of Astronomy
Address: Larak Garden, opposite Araj, Artesh Highway,Tehran, Iran
E-mail: astro(at)ipm.ir