# Panchromatic Photometry of Low-redshift, Massive Galaxies Selected from SDSS Stripe 82

**Authors:** Yang A. Li, Luis C. Ho, Jinyi Shangguan, Ming-Yang Zhuang, Ruancun Li  
**arXiv:** [2307.13461](https://arxiv.org/abs/2307.13461)  
**Date:** 2023-07-25  
**Summary page:** https://www.summarizepaper.com/en/paper/2307.13461v1/

## Key points

- Comprehensive catalog of panchromatic photometry for 2685 low-redshift, massive galaxies
- Covers 17 bands ranging from far-ultraviolet to 500 µm
- Derives measurements for stellar mass, star formation rate (SFR), dust content, and nonstellar sources
- Develops a hybrid approach combining matched-aperture photometry with profile-fitting photometry
- Addresses challenges such as deblending interacting/merging galaxies and contamination by foreground stars
- Uses spectral energy distribution fitting to estimate stellar mass, SFR, and dust mass
- Applies corrections for systematic uncertainties based on extensive mock tests
- Good agreement with published catalogs for stellar masses but discrepancies in SFR measurements below the green valley
- Emphasizes the importance of accurate and inclusive photometry in SED analysis
- Caution needed when interpreting SFRs of galaxies with moderate to weak star formation activity
- Provides valuable data for future studies on galaxy evolution and fundamental parameters

## Summary

This study presents a comprehensive catalog of panchromatic photometry for 2685 low-redshift, massive galaxies selected from the Stripe 82 region of the Sloan Digital Sky Survey. The authors cover 17 bands ranging from the far-ultraviolet to 500 µm in order to derive robust measurements for stellar mass, star formation rate (SFR), dust content and possible contribution from nonstellar sources. To obtain accurate photometry, they develop a hybrid approach that combines matched-aperture photometry with profile-fitting photometry. This approach takes advantage of deep optical coadded images and is optimized for resolving bright nearby galaxies. Challenges such as deblending interacting/merging galaxies and sources in crowded regions as well as contamination by foreground stars are addressed. The derived SEDs are used to estimate stellar mass, SFR and dust mass through spectral energy distribution fitting. Corrections for systematic uncertainties based on extensive mock tests are applied to account for flux upper limits for undetected photometric bands. Comparisons with published catalogs show good agreement for stellar masses but discrepancies arise when comparing SFR measurements for galaxies in and below the green valley. This study emphasizes the importance of incorporating accurate and inclusive photometry into SED analysis and highlights the need for caution when interpreting SFRs of galaxies with moderate to weak star formation activity. The presented catalog provides valuable data for future studies on galaxy evolution and fundamental parameters.