The Herschel Space Observatory, a cornerstone of far-infrared (FIR) and submillimeter astronomy, revolutionized our understanding of galaxy evolution. Among its many groundbreaking surveys, the Herschel Guaranteed Time Observation (GTO) PACS Evolutionary Probe (PEP) survey stands out for its deep and extensive observations at 70, 100, and 160 μm. This rich dataset, coupled with the power of the HerMES (Herschel Multi-tiered Extragalactic Survey) project, forms the basis for a wealth of scientific discoveries, collectively referred to as "Hermes PEP." This article delves into the significance of the Hermes PEP data, exploring its impact on our understanding of galaxy formation and evolution, focusing on the luminosity function and the innovative tools developed for its analysis.
The Herschel* PEP: The PACS Evolutionary Probe (PEP) survey, a key component of the Herschel GTO program, was designed to probe the properties of galaxies across cosmic time. Its primary goal was to obtain deep, high-resolution images of a large number of fields, allowing astronomers to investigate the star formation history of the universe. The PEP survey's unique contribution lies in its extensive coverage at far-infrared wavelengths, a spectral region crucial for understanding the dust-obscured star formation prevalent in galaxies. The deep observations allowed for the detection of faint, high-redshift galaxies, pushing the boundaries of our observational capabilities and revealing previously hidden populations. The long wavelengths observed by PEP penetrate the obscuring dust, revealing the true extent of star formation activity within these galaxies, which would be otherwise missed by optical and near-infrared observations.
HERMES on PEP.ph: The HerMES project, a major component of the Herschel GTO program, significantly enhanced the scientific potential of the PEP survey. HerMES leveraged the PEP data to create a comprehensive, multi-wavelength catalog of galaxies. By combining PEP's far-infrared data with data from other surveys at different wavelengths (optical, near-infrared, radio), HerMES provided a more complete picture of galaxy properties, including their star formation rates, stellar masses, and dust content. The PEP.ph website, though potentially outdated (requiring further verification for current accessibility), likely served as a crucial repository for the combined HerMES and PEP data, making this vast dataset accessible to the astronomical community. This integration was pivotal, allowing for a more robust analysis and a deeper understanding of the processes driving galaxy evolution.
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