Near-identical star formation rate densities from Hα and FUV at redshift zero

Fiona M. Audcent-Ross; Gerhardt R. Meurer; O. I. Wong; Z. Zheng; D. Hanish; M. A. Zwaan; J. Bland-Hawthorn; A. Elagali; M. Meyer; M. E. Putman; E. V. Ryan-Weber; S. M. Sweet; D. A. Thilker; M. Seibert; R. Allen; M. A. Dopita; M. T. Doyle-Pegg; M. Drinkwater; H. C. Ferguson; K. C. Freeman; T. M. Heckman; R. C. Kennicutt; V. A. Kilborn; J. H. Kim; P. M. Knezek; B. Koribalski; R. C. Smith; L. Staveley-Smith; R. L. Webster; J. K. Werk

doi:10.1093/mnras/sty1538

Near-identical star formation rate densities from Hα and FUV at redshift zero

Fiona M. Audcent-Ross, Gerhardt R. Meurer, O. I. Wong, Z. Zheng, D. Hanish, M. A. Zwaan, J. Bland-Hawthorn, A. Elagali, M. Meyer, M. E. Putman, E. V. Ryan-Weber, S. M. Sweet, D. A. Thilker, M. Seibert, R. Allen, M. A. Dopita, M. T. Doyle-Pegg, M. Drinkwater, H. C. Ferguson, K. C. FreemanT. M. Heckman, R. C. Kennicutt, V. A. Kilborn, J. H. Kim, P. M. Knezek, B. Koribalski, R. C. Smith, L. Staveley-Smith, R. L. Webster, J. K. Werk

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Abstract

For the first time both Hα and far-ultraviolet (FUV) observations from an HI-selected sample are used to determine the dust-corrected star formation rate density (SFRD: ρ˙) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies, we determine log(ρHα) = -1.68_-0.05^+0.13 [M_⊙ yr^-1 Mpc^-3] and log(ρ˙FUV) = -1.71_-0.13^+0.12 [M_⊙ yr^-1 Mpc^-3]. These values are derived from scaling Hα and FUV observations to the HI mass function. Galaxies were selected to uniformly sample the full HI mass (M_HI) range of the HI Parkes All-Sky Survey (M_HI ~ 10⁷ to ~10^10.7 M_⊙). The approach leads to relatively larger sampling of dwarf galaxies compared to optically selected surveys. The low HI mass, low luminosity, and low surface brightness galaxy populations have, on average, lower Hα/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The nearidentical Hα- and FUV-derived SFRD values arise with the low Hα/FUV flux ratios of some galaxies being offset by enhanced Hα from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the HI mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.

Original language	English
Pages (from-to)	119-133
Number of pages	15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	480
Issue number	1
DOIs	https://doi.org/10.1093/mnras/sty1538
Publication status	Published - 11 Oct 2018

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Audcent-Ross, F. M., Meurer, G. R., Wong, O. I., Zheng, Z., Hanish, D., Zwaan, M. A., Bland-Hawthorn, J., Elagali, A., Meyer, M., Putman, M. E., Ryan-Weber, E. V., Sweet, S. M., Thilker, D. A., Seibert, M., Allen, R., Dopita, M. A., Doyle-Pegg, M. T., Drinkwater, M., Ferguson, H. C., ... Werk, J. K. (2018). Near-identical star formation rate densities from Hα and FUV at redshift zero. Monthly Notices of the Royal Astronomical Society, 480(1), 119-133. https://doi.org/10.1093/mnras/sty1538

@article{1639591aeef944c399978a0afd718336,

title = "Near-identical star formation rate densities from Hα and FUV at redshift zero",

abstract = "For the first time both Hα and far-ultraviolet (FUV) observations from an HI-selected sample are used to determine the dust-corrected star formation rate density (SFRD: ρ˙) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies, we determine log(ρHα) = -1.68-0.05+0.13 [M⊙ yr-1 Mpc-3] and log(ρ˙FUV) = -1.71-0.13+0.12 [M⊙ yr-1 Mpc-3]. These values are derived from scaling Hα and FUV observations to the HI mass function. Galaxies were selected to uniformly sample the full HI mass (MHI) range of the HI Parkes All-Sky Survey (MHI ~ 107 to ~1010.7 M⊙). The approach leads to relatively larger sampling of dwarf galaxies compared to optically selected surveys. The low HI mass, low luminosity, and low surface brightness galaxy populations have, on average, lower Hα/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The nearidentical Hα- and FUV-derived SFRD values arise with the low Hα/FUV flux ratios of some galaxies being offset by enhanced Hα from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the HI mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.",

keywords = "Galaxies: luminosity function, Galaxies: star formation, Mass function, Surveys, Ultraviolet: galaxies",

author = "Audcent-Ross, {Fiona M.} and Meurer, {Gerhardt R.} and Wong, {O. I.} and Z. Zheng and D. Hanish and Zwaan, {M. A.} and J. Bland-Hawthorn and A. Elagali and M. Meyer and Putman, {M. E.} and Ryan-Weber, {E. V.} and Sweet, {S. M.} and Thilker, {D. A.} and M. Seibert and R. Allen and Dopita, {M. A.} and Doyle-Pegg, {M. T.} and M. Drinkwater and Ferguson, {H. C.} and Freeman, {K. C.} and Heckman, {T. M.} and Kennicutt, {R. C.} and Kilborn, {V. A.} and Kim, {J. H.} and Knezek, {P. M.} and B. Koribalski and Smith, {R. C.} and L. Staveley-Smith and Webster, {R. L.} and Werk, {J. K.}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2018",

month = oct,

day = "11",

doi = "10.1093/mnras/sty1538",

language = "English",

volume = "480",

pages = "119--133",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "1",

}

Audcent-Ross, FM, Meurer, GR, Wong, OI, Zheng, Z, Hanish, D, Zwaan, MA, Bland-Hawthorn, J, Elagali, A, Meyer, M, Putman, ME, Ryan-Weber, EV, Sweet, SM, Thilker, DA, Seibert, M, Allen, R, Dopita, MA, Doyle-Pegg, MT, Drinkwater, M, Ferguson, HC, Freeman, KC, Heckman, TM, Kennicutt, RC, Kilborn, VA, Kim, JH, Knezek, PM, Koribalski, B, Smith, RC, Staveley-Smith, L, Webster, RL & Werk, JK 2018, 'Near-identical star formation rate densities from Hα and FUV at redshift zero', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 1, pp. 119-133. https://doi.org/10.1093/mnras/sty1538

TY - JOUR

T1 - Near-identical star formation rate densities from Hα and FUV at redshift zero

AU - Audcent-Ross, Fiona M.

AU - Meurer, Gerhardt R.

AU - Wong, O. I.

AU - Zheng, Z.

AU - Hanish, D.

AU - Zwaan, M. A.

AU - Bland-Hawthorn, J.

AU - Elagali, A.

AU - Meyer, M.

AU - Putman, M. E.

AU - Ryan-Weber, E. V.

AU - Sweet, S. M.

AU - Thilker, D. A.

AU - Seibert, M.

AU - Allen, R.

AU - Dopita, M. A.

AU - Doyle-Pegg, M. T.

AU - Drinkwater, M.

AU - Ferguson, H. C.

AU - Freeman, K. C.

AU - Heckman, T. M.

AU - Kennicutt, R. C.

AU - Kilborn, V. A.

AU - Kim, J. H.

AU - Knezek, P. M.

AU - Koribalski, B.

AU - Smith, R. C.

AU - Staveley-Smith, L.

AU - Webster, R. L.

AU - Werk, J. K.

PY - 2018/10/11

Y1 - 2018/10/11

N2 - For the first time both Hα and far-ultraviolet (FUV) observations from an HI-selected sample are used to determine the dust-corrected star formation rate density (SFRD: ρ˙) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies, we determine log(ρHα) = -1.68-0.05+0.13 [M⊙ yr-1 Mpc-3] and log(ρ˙FUV) = -1.71-0.13+0.12 [M⊙ yr-1 Mpc-3]. These values are derived from scaling Hα and FUV observations to the HI mass function. Galaxies were selected to uniformly sample the full HI mass (MHI) range of the HI Parkes All-Sky Survey (MHI ~ 107 to ~1010.7 M⊙). The approach leads to relatively larger sampling of dwarf galaxies compared to optically selected surveys. The low HI mass, low luminosity, and low surface brightness galaxy populations have, on average, lower Hα/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The nearidentical Hα- and FUV-derived SFRD values arise with the low Hα/FUV flux ratios of some galaxies being offset by enhanced Hα from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the HI mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.

AB - For the first time both Hα and far-ultraviolet (FUV) observations from an HI-selected sample are used to determine the dust-corrected star formation rate density (SFRD: ρ˙) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies, we determine log(ρHα) = -1.68-0.05+0.13 [M⊙ yr-1 Mpc-3] and log(ρ˙FUV) = -1.71-0.13+0.12 [M⊙ yr-1 Mpc-3]. These values are derived from scaling Hα and FUV observations to the HI mass function. Galaxies were selected to uniformly sample the full HI mass (MHI) range of the HI Parkes All-Sky Survey (MHI ~ 107 to ~1010.7 M⊙). The approach leads to relatively larger sampling of dwarf galaxies compared to optically selected surveys. The low HI mass, low luminosity, and low surface brightness galaxy populations have, on average, lower Hα/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The nearidentical Hα- and FUV-derived SFRD values arise with the low Hα/FUV flux ratios of some galaxies being offset by enhanced Hα from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the HI mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.

KW - Galaxies: luminosity function

KW - Galaxies: star formation

KW - Mass function

KW - Surveys

KW - Ultraviolet: galaxies

UR - http://www.scopus.com/inward/record.url?scp=85052591400&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty1538

DO - 10.1093/mnras/sty1538

M3 - Article

SN - 0035-8711

VL - 480

SP - 119

EP - 133

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Near-identical star formation rate densities from Hα and FUV at redshift zero

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