期刊
ASTROPHYSICAL JOURNAL
卷 691, 期 1, 页码 783-793出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/691/1/783
关键词
galaxies: active; galaxies: clusters: individual (Cl0024+16); galaxies: evolution; galaxies: starburst
资金
- UK Science and Technology Facilities Council
- Royal Society
- Sloan Foundation through a Sloan Research Fellowship
- Packard Foundation
- Jet Propulsion Laboratory (JPL), California Institute of Technology
- NASA [1407]
- National Science Foundation [0642621]
- [GO 3143]
- [GO 30621]
- STFC [ST/F002963/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0642621] Funding Source: National Science Foundation
We present the results of a Spitzer Infrared Spectrograph survey of 24 mu m selected luminous infrared galaxies (LIRGs, L(IR) > 10(11) L(circle dot)) in the rich cluster Cl 0024+16 at z = 0.4. Optically, these LIRGs resemble unremarkable spiral galaxies with e(a)/e(c) spectral classifications and [O II]-derived star formation rates (SFRs) of less than or similar to 2 M(circle dot) yr(-1), generally indistinguishable from the quiescent star-forming population in the cluster. Our IRS spectra show that the majority of the 24 mu m detected galaxies exhibit polycyclic aromatic hydrocarbon emission with implied SFRs similar to 30-60 M(circle dot) yr(-1), with only one (< 10%) in the sample displaying unambiguous evidence of an active galactic nucleus in the mid-infrared. This confirms the presence of a large population of obscured starburst galaxies in distant clusters, which comprise the bulk of the star formation occurring in these environments at z similar to 0.5. We suggest that, although several mechanisms could be at play, these dusty starbursts could be the signature of an important evolutionary transition converting gas-rich spiral galaxies in distant clusters into the passive, bulge-dominated lenticular galaxies that become increasingly abundant in the cores of rich clusters in the similar to 4 Gyr to the present day.
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