Bibcode
Popesso, P.; Rodighiero, G.; Saintonge, A.; Santini, P.; Grazian, A.; Lutz, D.; Brusa, M.; Altieri, B.; Andreani, P.; Aussel, H.; Berta, S.; Bongiovanni, A.; Cava, A.; Cepa, J.; Cimatti, A.; Daddi, E.; Dominguez, H.; Elbaz, D.; Förster Schreiber, N.; Genzel, R.; Gruppioni, C.; Magdis, G.; Maiolino, R.; Magnelli, B.; Nordon, R.; Pérez-García, A. M.; Poglitsch, A.; Pozzi, F.; Riguccini, L.; Sanchez-Portal, M.; Shao, L.; Sturm, E.; Tacconi, L.; Valtchanov, I.; Wieprecht, E.; Wetzstein, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 532, id.A145
Advertised on:
8
2011
Journal
Citations
51
Refereed citations
50
Description
We use deep 70, 100 and 160 μm observations taken with PACS, the
Photodetector Array Camera and Spectrometer on board of Herschel, as
part of the PACS Evolutionary Probe (PEP) guaranteed time, to study the
relation between star formation rate and environment at redshift ~ 1 in
the GOODS-S and GOODS-N fields. We use the SDSS spectroscopic catalog to
build the local analog and study the evolution of the star formation
activity dependence on the environment. At z ~ 1 we observe a reversal
of the relation between star formation rate and local density,
confirming the results based on Spitzer 24 μm data. However, due to
the high accuracy provided by PACS in measuring the star formation rate
also for AGN hosts, we identify in this class of objects the cause for
the reversal of the density-SFR relation. Indeed, AGN hosts favor high
stellar masses, dense regions and high star formation rates. Without the
AGN contribution the relation flattens consistently with respect to the
local analog in the same range of star formation rates. As in the local
universe, the specific star formation rate anti-correlates with the
density. This is due to mass segregation both at high and low redshift.
The contribution of AGN hosts does not affect this anti-correlation,
since AGN hosts exhibit the same specific star formation rate as star
forming galaxies at the same mass. The same global trends and AGN
contribution is observed once the relations are studied per
morphological type. We study the specific star formation rate vs.
stellar mass relation in three density regimes. Our data provides an
indication that at M/M&sun; > 1011 the mean
specific star formation rate tends to be higher at higher density, while
the opposite trend is observed in the local SDSS star forming sample.
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Galaxy evolution is a crucial topic in modern extragalactic astrophysics, linking cosmology to the Local Universe. Their study requires collecting statistically significant samples of galaxies of different luminosities at different distances. It implies the ability to observe faint objects using different techniques, and at different wavelengths
Jorge
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