Resolving the Disk-Halo Degeneracy: A look at M74

Suryashree Aniyan; Kenneth Freeman; Magda Arnaboldi; Ortwin Gerhard; L Coccato; Konrad Kuijken; M R Merrifield

doi:10.1017/S1743921316008814

Resolving the Disk-Halo Degeneracy: A look at M74

Suryashree Aniyan, Kenneth Freeman, Magda Arnaboldi, Ortwin Gerhard, L Coccato, Konrad Kuijken, M R Merrifield

Research output: Contribution to journal › Meeting Abstract › peer-review

Abstract

The decomposition of the 21 cm rotation curve of galaxies into contribution from the disk and dark halo depends on the adopted mass to light ratio (M/L) of the disk. Given the vertical velocity dispersion (sigma(z)) of stars in the disk and its scale height (h), the disk surface density and hence the M/L can be estimated. Earlier works have used this technique to conclude that galaxy disks are submaximal. Here we address an important conceptual problem: sigma(z) and h must pertain to the same population. Our analysis concludes that previous studies underestimate the disk surface mass density by similar to 2, sufficient to make a maximal disk for M74 appear like a submaximal disk.

Original language	English
Pages (from-to)	267-267
Journal	Proceedings of the International Astronomical Union Symposium S321
DOIs	https://doi.org/10.1017/S1743921316008814
Publication status	Published - 2016
Event	International Astronomical Union, Symposium S321: Formation and evolution of galaxy outskirts - Toledo, Spain Duration: 1 Jan 2016 → …

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title = "Resolving the Disk-Halo Degeneracy: A look at M74",

abstract = "The decomposition of the 21 cm rotation curve of galaxies into contribution from the disk and dark halo depends on the adopted mass to light ratio (M/L) of the disk. Given the vertical velocity dispersion (sigma(z)) of stars in the disk and its scale height (h), the disk surface density and hence the M/L can be estimated. Earlier works have used this technique to conclude that galaxy disks are submaximal. Here we address an important conceptual problem: sigma(z) and h must pertain to the same population. Our analysis concludes that previous studies underestimate the disk surface mass density by similar to 2, sufficient to make a maximal disk for M74 appear like a submaximal disk.",

author = "Suryashree Aniyan and Kenneth Freeman and Magda Arnaboldi and Ortwin Gerhard and L Coccato and Konrad Kuijken and Merrifield, {M R}",

year = "2016",

doi = "10.1017/S1743921316008814",

language = "English",

pages = "267--267",

journal = "Proceedings of the International Astronomical Union Symposium S321",

publisher = "Cambridge University Press",

note = "International Astronomical Union, Symposium S321: Formation and evolution of galaxy outskirts ; Conference date: 01-01-2016",

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TY - JOUR

T1 - Resolving the Disk-Halo Degeneracy: A look at M74

AU - Aniyan, Suryashree

AU - Freeman, Kenneth

AU - Arnaboldi, Magda

AU - Gerhard, Ortwin

AU - Coccato, L

AU - Kuijken, Konrad

AU - Merrifield, M R

PY - 2016

Y1 - 2016

N2 - The decomposition of the 21 cm rotation curve of galaxies into contribution from the disk and dark halo depends on the adopted mass to light ratio (M/L) of the disk. Given the vertical velocity dispersion (sigma(z)) of stars in the disk and its scale height (h), the disk surface density and hence the M/L can be estimated. Earlier works have used this technique to conclude that galaxy disks are submaximal. Here we address an important conceptual problem: sigma(z) and h must pertain to the same population. Our analysis concludes that previous studies underestimate the disk surface mass density by similar to 2, sufficient to make a maximal disk for M74 appear like a submaximal disk.

AB - The decomposition of the 21 cm rotation curve of galaxies into contribution from the disk and dark halo depends on the adopted mass to light ratio (M/L) of the disk. Given the vertical velocity dispersion (sigma(z)) of stars in the disk and its scale height (h), the disk surface density and hence the M/L can be estimated. Earlier works have used this technique to conclude that galaxy disks are submaximal. Here we address an important conceptual problem: sigma(z) and h must pertain to the same population. Our analysis concludes that previous studies underestimate the disk surface mass density by similar to 2, sufficient to make a maximal disk for M74 appear like a submaximal disk.

U2 - 10.1017/S1743921316008814

DO - 10.1017/S1743921316008814

M3 - Meeting Abstract

SP - 267

EP - 267

JO - Proceedings of the International Astronomical Union Symposium S321

JF - Proceedings of the International Astronomical Union Symposium S321

T2 - International Astronomical Union, Symposium S321: Formation and evolution of galaxy outskirts

Y2 - 1 January 2016

ER -

Resolving the Disk-Halo Degeneracy: A look at M74

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