Query : 2015A&A...581A.114M

2015A&A...581A.114M - Astronomy and Astrophysics, volume 581A, 114-114 (2015/9-1)

Environmental dependence of polycyclic aromatic hydrocarbon emission at z ∼ 0.8. Investigation by observing RX J0152.7-1357 with AKARI.


Abstract (from CDS):

We study the environmental dependence of the strength of polycyclic aromatic hydrocarbon (PAH) emission using AKARI observations of RX J0152.7-1357, a galaxy cluster at z=0.84. PAH emission reflects the physical conditions of galaxies and dominates 8µm luminosity (L8), which can be directly measured with the L15 band of AKARI. The ratio of L8 to infrared luminosity (LIR) is used as a tracer of the PAH strength. Both photometric and spectroscopic redshifts are applied to identify the cluster members. The galaxies detected with the L15 band tend to reside in the outskirts of the cluster and have an optically green colour, R-z'∼1.2. We find no clear difference between the L8/LIR behaviour of galaxies in field and cluster environments. 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 galaxies, are located only in the outskirts 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.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: RX J0152.7-1357 - galaxies: starburst - infrared: galaxies

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11135 1
2 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 258 3
3 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2957 4
4 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 134 0

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