The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3

S. N. Richards; A. L. Schaefer; A. R. López-Sánchez; S. M. Croom; J. J. Bryant; S. M. Sweet; I. S. Konstantopoulos; J. T. Allen; J. Bland-Hawthorn; J. V. Bloom; S. Brough; L. M.R. Fogarty; M. Goodwin; A. W. Green; I. T. Ho; L. J. Kewley; B. S. Koribalski; J. S. Lawrence; M. S. Owers; E. M. Sadler; R. Sharp

doi:10.1093/mnras/stu1820

The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3

S. N. Richards^*, A. L. Schaefer, A. R. López-Sánchez, S. M. Croom, J. J. Bryant, S. M. Sweet, I. S. Konstantopoulos, J. T. Allen, J. Bland-Hawthorn, J. V. Bloom, S. Brough, L. M.R. Fogarty, M. Goodwin, A. W. Green, I. T. Ho, L. J. Kewley, B. S. Koribalski, J. S. Lawrence, M. S. Owers, E. M. SadlerR. Sharp

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

We present the discovery of a luminous unresolved HII complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ~100 Mpc and contains an unresolved region of HII emission that contributes ~70 per cent of the galaxy's Hα luminosity, located at the top end of established HII region luminosity functions. For the HII complex, we measure a star formation rate of 0.147 ± 0.041 M⊙ yr^-1and a metallicity of 12+log(O/H) = 8.01 ± 0.05 that is lower than the rest of the galaxy by ~0.2 dex. Data from the HI Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this HII complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative of interactions. We showthat SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.

Original language	English
Pages (from-to)	1104-1113
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	445
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stu1820
Publication status	Published - 1 Dec 2014

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Richards, S. N., Schaefer, A. L., López-Sánchez, A. R., Croom, S. M., Bryant, J. J., Sweet, S. M., Konstantopoulos, I. S., Allen, J. T., Bland-Hawthorn, J., Bloom, J. V., Brough, S., Fogarty, L. M. R., Goodwin, M., Green, A. W., Ho, I. T., Kewley, L. J., Koribalski, B. S., Lawrence, J. S., Owers, M. S., ... Sharp, R. (2014). The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3. Monthly Notices of the Royal Astronomical Society, 445(2), 1104-1113. https://doi.org/10.1093/mnras/stu1820

@article{18d43004d7c748a885c50964e89c8547,

title = "The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3",

abstract = "We present the discovery of a luminous unresolved HII complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ~100 Mpc and contains an unresolved region of HII emission that contributes ~70 per cent of the galaxy's Hα luminosity, located at the top end of established HII region luminosity functions. For the HII complex, we measure a star formation rate of 0.147 ± 0.041 M⊙ yr-1and a metallicity of 12+log(O/H) = 8.01 ± 0.05 that is lower than the rest of the galaxy by ~0.2 dex. Data from the HI Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this HII complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative of interactions. We showthat SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.",

keywords = "Galaxies: dwarf, Galaxies: evolution, Galaxies: star formation, Galaxies: starburst, HII regions, Techniques: spectroscopic",

author = "Richards, {S. N.} and Schaefer, {A. L.} and L{\'o}pez-S{\'a}nchez, {A. R.} and Croom, {S. M.} and Bryant, {J. J.} and Sweet, {S. M.} and Konstantopoulos, {I. S.} and Allen, {J. T.} and J. Bland-Hawthorn and Bloom, {J. V.} and S. Brough and Fogarty, {L. M.R.} and M. Goodwin and Green, {A. W.} and Ho, {I. T.} and Kewley, {L. J.} and Koribalski, {B. S.} and Lawrence, {J. S.} and Owers, {M. S.} and Sadler, {E. M.} and R. Sharp",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors.",

year = "2014",

month = dec,

day = "1",

doi = "10.1093/mnras/stu1820",

language = "English",

volume = "445",

pages = "1104--1113",

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

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "2",

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Richards, SN, Schaefer, AL, López-Sánchez, AR, Croom, SM, Bryant, JJ, Sweet, SM, Konstantopoulos, IS, Allen, JT, Bland-Hawthorn, J, Bloom, JV, Brough, S, Fogarty, LMR, Goodwin, M, Green, AW, Ho, IT, Kewley, LJ, Koribalski, BS, Lawrence, JS, Owers, MS, Sadler, EM & Sharp, R 2014, 'The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3', Monthly Notices of the Royal Astronomical Society, vol. 445, no. 2, pp. 1104-1113. https://doi.org/10.1093/mnras/stu1820

TY - JOUR

T1 - The SAMI galaxy survey

T2 - The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3

AU - Richards, S. N.

AU - Schaefer, A. L.

AU - López-Sánchez, A. R.

AU - Croom, S. M.

AU - Bryant, J. J.

AU - Sweet, S. M.

AU - Konstantopoulos, I. S.

AU - Allen, J. T.

AU - Bland-Hawthorn, J.

AU - Bloom, J. V.

AU - Brough, S.

AU - Fogarty, L. M.R.

AU - Goodwin, M.

AU - Green, A. W.

AU - Ho, I. T.

AU - Kewley, L. J.

AU - Koribalski, B. S.

AU - Lawrence, J. S.

AU - Owers, M. S.

AU - Sadler, E. M.

AU - Sharp, R.

PY - 2014/12/1

Y1 - 2014/12/1

N2 - We present the discovery of a luminous unresolved HII complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ~100 Mpc and contains an unresolved region of HII emission that contributes ~70 per cent of the galaxy's Hα luminosity, located at the top end of established HII region luminosity functions. For the HII complex, we measure a star formation rate of 0.147 ± 0.041 M⊙ yr-1and a metallicity of 12+log(O/H) = 8.01 ± 0.05 that is lower than the rest of the galaxy by ~0.2 dex. Data from the HI Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this HII complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative of interactions. We showthat SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.

AB - We present the discovery of a luminous unresolved HII complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ~100 Mpc and contains an unresolved region of HII emission that contributes ~70 per cent of the galaxy's Hα luminosity, located at the top end of established HII region luminosity functions. For the HII complex, we measure a star formation rate of 0.147 ± 0.041 M⊙ yr-1and a metallicity of 12+log(O/H) = 8.01 ± 0.05 that is lower than the rest of the galaxy by ~0.2 dex. Data from the HI Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this HII complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative of interactions. We showthat SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.

KW - Galaxies: dwarf

KW - Galaxies: evolution

KW - Galaxies: star formation

KW - Galaxies: starburst

KW - HII regions

KW - Techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=84940363763&partnerID=8YFLogxK

U2 - 10.1093/mnras/stu1820

DO - 10.1093/mnras/stu1820

M3 - Article

SN - 0035-8711

VL - 445

SP - 1104

EP - 1113

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

The SAMI galaxy survey: The discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3

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