| |
 |
| Paper: |
Towards a Complete Census of High-z ULIRGs with Herschel |
| Volume: |
446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective |
| Page: |
221 |
| Authors: |
Magdis, G. E.; Elbaz, D.; Hwang, H. S.; PEP and HerMES team |
| Abstract: |
Using Herschel PACS and SPIRE observations as part of the HerMES, we
explore the far-IR properties of a sample of mid-IR selected
starburst dominated ultra-luminous infrared galaxies (ULIRGs) at z
∼ 2. We derive robust estimates of infrared luminosities
(LIR) and dust temperatures (Td) of the population and
find that galaxies in our sample range from those that are as cold
as high-z sub-millimeter galaxies (SMGs) to those that are as warm
as optically faint radio galaxies (OFRGs) and local ULIRGs. We also
demonstrate that a significant fraction of our sample would be
missed from ground based (sub)mm surveys (850-1200μm) showing
that the latter introduce a bias towards the detection of colder
sources. Similarly, based on PACS data as part of the PEP project,
we construct for the first time the full average SED of a sub-sample
of infrared luminous Lyman break galaxies at z∼3, and find them
to have higher Td when compared to that of SMGs with
comparable LIR. We conclude that high-z ULIRGs span a wide
range of dust temperatures, larger than that seen in local ULIRGs,
and that Herschel data provide the means to characterize the bulk of
the ULIRG population, free from selection biases introduced by
ground based (sub)mm surveys. |
|
|
|
|
|
