Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00643696" target="_blank" >RIV/68378271:_____/25:00643696 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0375365" target="_blank" >https://hdl.handle.net/11104/0375365</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202453448" target="_blank" >10.1051/0004-6361/202453448</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys

Popis výsledku v původním jazyce

In many areas of extragalactic astrophysics, we need to convert the luminosity of a galaxy into its stellar mass. In this work, we aim to find a simple and effective formula to estimate the stellar mass from the images of galaxies delivered by the currently popular DESI Legacy Imaging Surveys. This survey provides an unsurpassed combination of deep imaging and extensive sky coverage in up to four photometric bands. We calibrated the desired formula using a sample of local galaxies observed in the Spitzer Survey of Stellar Structure in Galaxies (S(4)G), which was specifically dedicated to measuring stellar masses. For the absolute magnitudes, M-g and M-r, of a galaxy in the g and r bands of the Legacy Surveys, we can estimate the stellar masses as 0.673M(g) 1.108M(r) + 0.996 with a scatter of 25%. Employing more complex functions does not improve the estimate appreciably, even after including the galaxy ellipticity, Sérsic index, or the magnitudes in different Legacy surveys bands. Generally, measurements in the r band were the most helpful, while adding z-band measurements did not improve the mass estimate much. We provide a Python-based script, photomass_ls.py, to automatically download images of any galaxy from the Legacy surveys database, create image masks, generate GALFIT input files with well-assessed initial values, perform GALFIT photometry, and calculate stellar mass estimates. Additionally, we tuned another version of the formula to the magnitudes provided by the Siena Galaxy Atlas 2020 (SGA-2020) with a scatter of 29%. For both our default and SGA-2020 formula, we offer two alternatives derived from different calibrations of S(4)G masses based on different methods and assumptions.

Název v anglickém jazyce

Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys

Popis výsledku anglicky

In many areas of extragalactic astrophysics, we need to convert the luminosity of a galaxy into its stellar mass. In this work, we aim to find a simple and effective formula to estimate the stellar mass from the images of galaxies delivered by the currently popular DESI Legacy Imaging Surveys. This survey provides an unsurpassed combination of deep imaging and extensive sky coverage in up to four photometric bands. We calibrated the desired formula using a sample of local galaxies observed in the Spitzer Survey of Stellar Structure in Galaxies (S(4)G), which was specifically dedicated to measuring stellar masses. For the absolute magnitudes, M-g and M-r, of a galaxy in the g and r bands of the Legacy Surveys, we can estimate the stellar masses as 0.673M(g) 1.108M(r) + 0.996 with a scatter of 25%. Employing more complex functions does not improve the estimate appreciably, even after including the galaxy ellipticity, Sérsic index, or the magnitudes in different Legacy surveys bands. Generally, measurements in the r band were the most helpful, while adding z-band measurements did not improve the mass estimate much. We provide a Python-based script, photomass_ls.py, to automatically download images of any galaxy from the Legacy surveys database, create image masks, generate GALFIT input files with well-assessed initial values, perform GALFIT photometry, and calculate stellar mass estimates. Additionally, we tuned another version of the formula to the magnitudes provided by the Siena Galaxy Atlas 2020 (SGA-2020) with a scatter of 29%. For both our default and SGA-2020 formula, we offer two alternatives derived from different calibrations of S(4)G masses based on different methods and assumptions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

704

Číslo periodika v rámci svazku

101067618

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

15

Strana od-do

A232

Kód UT WoS článku

001638047200012

EID výsledku v databázi Scopus

2-s2.0-105024752739