| Description |
For deep imaging longward of 100 um, confusion noise sets the fundamental sensitivity limits achievable with Herschel, and these limits cannot be improved by integrating longer. As a result, Herschel PACS-SPIRE images will not quite reach the depth of Spitzer 24 um, not to mention that of ALMA. This means that with the raw sensitivities of PACS and SPIRE, it will be difficult to reach the population of infrared-luminous galaxies at z>2. To penetrate through the Herschel confusion limits with the lensing power of massive galaxy clusters and to reach z>2 infrared-luminous galaxies, we propose here a deep PACS-SPIRE imaging survey of 40 lensing clusters, which have carefully been selected from the past and on-going HST-Spitzer surveys. Although both the PACS and SPIRE GT teams will conduct similar surveys, its small sample size of 10 clusters is not enough to fully achieve the great potential of such a survey since highly magnified (e.g., >5-10x) lensed galaxies are rare. By expanding the sample size by a factor of four, and by pre-selecting most spectacular sources from our on-going Spitzer 24um survey of virgul100 X-ray-luminous (i.e., massive) clusters, we will detect a significant number of highly magnified infrared-luminous galaxies at z>2 with PACS and SPIRE, which will enable us to (1) resolve a large fraction of the far-infrared-submillimeter background in the PACS-SPIRE bands and (2) map out the full spectral energy distributions (SEDs) of detected galaxies from mid-infrared to submillimter. Such an extensive survey of lensing clusters will be a great legacy of Herschel, providing a large number of interesting high-redshift targets for ALMA follow-up in the future. Because of the large sample size and strong lensing power of the targeted clusters, this survey also offers a great potential for breakthrough discoveries such as the first detection of a star-forming (i.e., non-AGN) galaxy at z>>4 in the far-infrared-submillimeter. |
| Publication |
A Catalog of Host Galaxies for WISE-selected AGN: Connecting Host Properties with Nuclear Activity and Identifying Contaminants . Barrows R. Scott et al. . The Astrophysical Journal . null . null . 2021ApJ...922..179B ,
Extensive Lensing Survey of Optical and Near-infrared Dark Objects (El Sonido): HST H-faint Galaxies behind 101 Lensing Clusters . Sun Fengwu et al. . The Astrophysical Journal . null . null . 2021ApJ...922..114S ,
The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies . Rawle T. D. et al. . The Astrophysical Journal, Volume 747, Issue 1, article id. 29, 15 pp. (2012). . 747 . 10.1088/0004-637X/747/1/29 . 2012ApJ...747...29R ,
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