Environmental dependence of polycyclic aromatic hydrocarbon emission at z~0.8. Investigation by observing the RX J0152.7-1357 with AKARI
arXiv:1507.00094 · doi:10.1051/0004-6361/201526276
Abstract
We study the environmental dependence of the strength of polycyclic aromatic hydrocarbon (PAH) emission by AKARI observations of RX J0152.7-1357, a galaxy cluster at z=0.84. PAH emission reflects the physical conditions of galaxies and dominates 8 um luminosity (L8), which can directly be measured with the L15 band of AKARI. L8 to infrared luminosity (LIR) ratio is used as a tracer of the PAH strength. Both photometric and spectroscopic redshifts are applied to identify the cluster members. The L15-band-detected galaxies tend to reside in the outskirt of the cluster and have optically green colour, R-z'~ 1.2. We find no clear difference of the L8/LIR behaviour of galaxies in field and cluster environment. The L8/LIR of cluster galaxies decreases with specific-star-formation rate divided by that of main-sequence galaxies, and with LIR, consistent with the results for field galaxies. The relation between L8/LIR and LIR is between those at z=0 and z=2 in the literature. Our data also shows that starburst galaxies, which have lower L8/LIR than main-sequence, are located only in the outskirt of the cluster. All these findings extend previous studies, indicating that environment affects only the fraction of galaxy types and does not affect the L8/LIR behaviour of star-forming galaxies.
8 pages, 7 figures. Accepted for Publication in A&A
References in corpus (12)
- Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
- The DEEP2 Galaxy Redshift Survey: The Role of Galaxy Environment in the Cosmic Star-Formation History
- Chandra and Spitzer unveil heavily obscured quasars in the SWIRE/Chandra Survey
- On the evolution and environmental dependence of the star formation rate versus stellar mass relation since z~2
- Clusters at Half Hubble Time: Galaxy Structure and Colors in RXJ0152.7-1357 and MS1054-03
- The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z=1
- Strong dusty bursts of star formation in galaxies falling into the cluster RXJ0152.7-1357
- Mapping dusty star formation in and around a cluster at z=0.81 by wide-field imaging with AKARI
- The environmental impacts on the star formation main sequence: an H-alpha study of the newly discovered rich cluster at z=1.52
- Polycyclic aromatic hydrocarbon feature deficit of starburst galaxies in the AKARI North Ecliptic Pole Deep Field
- Morphology with Light Profile Fitting of Confirmed Cluster Galaxies at z=0.84
- A tale of a rich cluster at z0.8 as seen by the Star Formation Histories of its ETGs