Velocity Dispersion σ aper Aperture Corrections as a Function of Galaxy Properties from Integral-field Stellar Kinematics of 10,000 MaNGA Galaxies

Zhu, Kai; Li, Ran; Cao, Xiaoyue; Lu, Shengdong; Cappellari, Michele; Mao, Shude

doi:10.1088/1674-4527/acd58a

Velocity Dispersion σ _aper Aperture Corrections as a Function of Galaxy Properties from Integral-field Stellar Kinematics of 10,000 MaNGA Galaxies

Journal Article · 05 July 2023 · Research in Astronomy and Astrophysics

DOI:https://doi.org/10.1088/1674-4527/acd58a· OSTI ID:2425387

; Li, Ran; ; ; ;

Abstract

The second moment of the stellar velocity within the effective radius, denoted by $σ_{e}^{2}$ , is a crucial quantity in galaxy studies, as it provides insight into galaxy properties and their mass distributions. However, large spectroscopic surveys typically do not measureσ_edirectly, instead providingσ_aper, the second moment of the stellar velocity within a fixed fiber aperture. In this paper, we derive an empirical aperture correction formula, given by $σ_{aper} / σ_{e} = {(R_{aper} / R_{e})}^{α}$ , using spatially resolved stellar kinematics extracted from approximately 10,000 Sloan Digital Sky Survey–Mapping Nearby Galaxies at Apache Point Observatory integral field unit observations. Our analysis reveals a strong dependence ofαon ther-band absolute magnitudeM_r,g–icolor, and Sérsic indexn_Ser, whereαvalues are lower for brighter, redder galaxies with higher Sérsic indices. Our results demonstrate that the aperture correction derived from previous literature on early-type galaxies cannot be applied to predict the aperture corrections for galaxies with intermediate Sérsic indices. We provide a lookup table ofαvalues for different galaxy types, with parameters in the ranges of −18 >M_r> −24, 0.4 <g–i< 1.6, and 0 <n_Ser< 8. A Python script is provided to obtain the correction factors from the lookup table.

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE

OSTI ID:: 2425387

Journal Information:: Research in Astronomy and Astrophysics, Journal Name: Research in Astronomy and Astrophysics Journal Issue: 8 Vol. 23; ISSN 1674-4527

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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Velocity Dispersion σ aper Aperture Corrections as a Function of Galaxy Properties from Integral-field Stellar Kinematics of 10,000 MaNGA Galaxies

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Velocity Dispersion σ _aper Aperture Corrections as a Function of Galaxy Properties from Integral-field Stellar Kinematics of 10,000 MaNGA Galaxies