The nature of dusty starburst galaxies in a rich cluster at z=0.4: the progenitors of lenticulars? Export

@article{citeulike:3338544, abstract = {We present the results of a Spitzer Infrared Spectrograph (IRS) survey of 24um-selected luminous infrared galaxies (LIRGs, L\_IR \> 10^11 L\_sun) in the rich cluster Cl0024+16 at z=0.4. Optically, these LIRGs resemble unremarkable spiral galaxies with e(a)/e(c) spectral classifications and [Oii]-derived star formation rates (SFRs) of \<2 M\_sun/yr, generally indistinguishable from the 'quiescent' star forming population in the cluster. Our IRS spectra show that the majority of the 24um-detected galaxies exhibit polycyclic aromatic hydrocarbon (PAH) emission with implied SFRs \~{}30-60 M\_sun/yr, with only one (\<10\%) of 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\~{}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 \~{}4Gyr to the present day.}, archivePrefix = {arXiv}, author = {Geach, J. E. and Smail, Ian and Moran, Sean M. and Treu, Tommaso and Ellis, Richard S.}, citeulike-article-id = {3338544}, citeulike-linkout-0 = {http://arxiv.org/abs/0809.4260}, citeulike-linkout-1 = {http://arxiv.org/pdf/0809.4260}, citeulike-linkout-2 = {http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2008arXiv0809.4260G}, day = {24}, eprint = {0809.4260}, keywords = {cluster, dusty, starbursts}, month = {Sep}, posted-at = {2008-09-26 03:13:31}, priority = {2}, title = {The nature of dusty starburst galaxies in a rich cluster at z=0.4: the progenitors of lenticulars?}, url = {http://arxiv.org/abs/0809.4260}, year = {2008} }

TY - JOUR ID - citeulike:3338544 L3 - citeulike-article-id:3338544 N2 - We present the results of a Spitzer Infrared Spectrograph (IRS) survey of 24um-selected luminous infrared galaxies (LIRGs, L_IR > 10^11 L_sun) in the rich cluster Cl0024+16 at z=0.4. Optically, these LIRGs resemble unremarkable spiral galaxies with e(a)/e(c) spectral classifications and [Oii]-derived star formation rates (SFRs) of <2 M_sun/yr, generally indistinguishable from the 'quiescent' star forming population in the cluster. Our IRS spectra show that the majority of the 24um-detected galaxies exhibit polycyclic aromatic hydrocarbon (PAH) emission with implied SFRs ~30-60 M_sun/yr, with only one (<10%) of 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~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 ~4Gyr to the present day. TI - The nature of dusty starburst galaxies in a rich cluster at z=0.4: the progenitors of lenticulars? KW - cluster KW - dusty KW - starbursts AU - Geach, JE AU - Smail, Ian AU - Moran, Sean AU - Treu, Tommaso AU - Ellis, Richard PY - 2008/Sep/24/ UR - http://arxiv.org/abs/0809.4260 ER -