HIghMass - High HI Mass, HI-Rich Galaxies at z∼0: Combined HI and H2 Observations

Gregory Hallenbeck; Shan Huang; Kristine Spekkens; Martha P. Haynes; Riccardo Giovanelli; Elizabeth A. K. Adams; Jarle Brinchmann; John Carpenter; Jayaram Chengalur; Leslie K. Hunt; Karen L. Masters; Amélie Saintonge

doi:10.3847/1538-3881/152/6/225

HIghMass - High HI Mass, HI-Rich Galaxies at z∼0: Combined HI and H₂ Observations

Gregory Hallenbeck, Shan Huang, Kristine Spekkens, Martha P. Haynes, Riccardo Giovanelli, Elizabeth A. K. Adams, Jarle Brinchmann, John Carpenter, Jayaram Chengalur, Leslie K. Hunt, Karen L. Masters, Amélie Saintonge

Institute of Cosmology & Gravitation

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Abstract

We present resolved and CO observations of three galaxies from the HIghMass sample, a sample of H I-massive (M_{H I} > 10¹⁰ M_Θ), gas-rich (M_{H I} in the top 5% for their M_*) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low-surface-brightness galaxies and have typical specific star formation rates (SFR/M_*) for their stellar masses. The three galaxies have normal SFRs for their H₂ masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of H I to H₂, not in converting to stars. In addition, their dark matter spin parameters (λ) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but is now becoming active, in agreement with prior Hα observations.

Original language	English
Article number	225
Journal	The Astronomical Journal
Volume	152
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/152/6/225
Publication status	Published - 7 Dec 2016

Keywords

astro-ph.GA
galaxies: evolution
galaxies: individual (UGC 6168, UGC 7899, NGC 5230)
galaxies: spiral
radio lines: galaxies

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10.3847/1538-3881/152/6/225

Hallenbeck_2016_AJ_152_225
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Cite this

@article{464d5386a26e48a289ed748a26695daf,

title = "HIghMass - High HI Mass, HI-Rich Galaxies at z∼0: Combined HI and H2 Observations",

abstract = "We present resolved and CO observations of three galaxies from the HIghMass sample, a sample of H I-massive (MH I > 1010 MΘ), gas-rich (MH I in the top 5% for their M *) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low-surface-brightness galaxies and have typical specific star formation rates (SFR/M*) for their stellar masses. The three galaxies have normal SFRs for their H2 masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of H I to H2, not in converting to stars. In addition, their dark matter spin parameters (λ) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but is now becoming active, in agreement with prior Hα observations.",

keywords = "astro-ph.GA, galaxies: evolution, galaxies: individual (UGC 6168, UGC 7899, NGC 5230), galaxies: spiral, radio lines: galaxies",

author = "Gregory Hallenbeck and Shan Huang and Kristine Spekkens and Haynes, {Martha P.} and Riccardo Giovanelli and Adams, {Elizabeth A. K.} and Jarle Brinchmann and John Carpenter and Jayaram Chengalur and Hunt, {Leslie K.} and Masters, {Karen L.} and Am{\'e}lie Saintonge",

note = "20 pages, 13 figures",

year = "2016",

month = dec,

day = "7",

doi = "10.3847/1538-3881/152/6/225",

language = "English",

volume = "152",

journal = "The Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing",

number = "6",

}

TY - JOUR

T1 - HIghMass - High HI Mass, HI-Rich Galaxies at z∼0

T2 - Combined HI and H2 Observations

AU - Hallenbeck, Gregory

AU - Huang, Shan

AU - Spekkens, Kristine

AU - Haynes, Martha P.

AU - Giovanelli, Riccardo

AU - Adams, Elizabeth A. K.

AU - Brinchmann, Jarle

AU - Carpenter, John

AU - Chengalur, Jayaram

AU - Hunt, Leslie K.

AU - Masters, Karen L.

AU - Saintonge, Amélie

N1 - 20 pages, 13 figures

PY - 2016/12/7

Y1 - 2016/12/7

N2 - We present resolved and CO observations of three galaxies from the HIghMass sample, a sample of H I-massive (MH I > 1010 MΘ), gas-rich (MH I in the top 5% for their M *) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low-surface-brightness galaxies and have typical specific star formation rates (SFR/M*) for their stellar masses. The three galaxies have normal SFRs for their H2 masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of H I to H2, not in converting to stars. In addition, their dark matter spin parameters (λ) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but is now becoming active, in agreement with prior Hα observations.

AB - We present resolved and CO observations of three galaxies from the HIghMass sample, a sample of H I-massive (MH I > 1010 MΘ), gas-rich (MH I in the top 5% for their M *) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low-surface-brightness galaxies and have typical specific star formation rates (SFR/M*) for their stellar masses. The three galaxies have normal SFRs for their H2 masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of H I to H2, not in converting to stars. In addition, their dark matter spin parameters (λ) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but is now becoming active, in agreement with prior Hα observations.

KW - astro-ph.GA

KW - galaxies: evolution

KW - galaxies: individual (UGC 6168, UGC 7899, NGC 5230)

KW - galaxies: spiral

KW - radio lines: galaxies

U2 - 10.3847/1538-3881/152/6/225

DO - 10.3847/1538-3881/152/6/225

M3 - Article

SN - 0004-6256

VL - 152

JO - The Astronomical Journal

JF - The Astronomical Journal

IS - 6

M1 - 225

ER -