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Properties of Low Surface Brightness Galaxies and Normal Spirals in the Near-IR
Astrophysics · Submitted 10 Jun 2002
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The strongest of our correlations are with the ratio of HI mass to total baryonic mass, MHI/Mbaryonic, which tracks the evolutionary state of the galaxies as they convert gas into stars, and which ranges from 0.05 up to nearly 1 for the galaxies in our sample.
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The abstract, sentence by sentence
(Abridged) We present results for J and Ks near-IR imaging data on a large sample of 88 galaxies drawn from the catalogue of Impey et al. (1996). The near-IR data unveils many features of LSBGs not seen before in the optical. First, a high fraction of the observed LSBGs are very luminous in the near-IR, indicating that they have a well developed old stellar population, and that older LSBGs are more frequent in the universe than data from optical bands suggested. Second, the near-IR morphologies are often quite different than seen in the optical. Third, we find significant trends between the near-IR morphologies of the galaxies and their ratio of HI mass to near-IR luminosity. Fourth, we find no trend in disk surface brightness with absolute magnitude, but significant correlations when the bulge surface brightness is used. Finally, we find that the formation of a bulge requires a galaxy to have a total baryonic mass above ~ 10**10 Msun. A wide variety of other correlations are explored for the sample. The strongest of our correlations are with the ratio of HI mass to total baryonic mass, MHI/Mbaryonic, which tracks the evolutionary state of the galaxies as they convert gas into stars, and which ranges from 0.05 up to nearly 1 for the galaxies in our sample. We see also trends between MHI/Mbaryonic and central surface density, suggesting that increased star formation efficiency with increasing gas surface density strongly drives the conversion of gas into stars.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | (Abridged) We present results for J and Ks near-IR imaging data on a large sample of 88 galaxies drawn from the catalogue of Impey et al. (1996). | contribution 0.65 | 0.86 | 0.02 | asserted 0.98 |
| s1 | The near-IR data unveils many features of LSBGs not seen before in the optical. | result 0.66 | 0.83 | 0.10 | asserted 1.00 |
| s2 | First, a high fraction of the observed LSBGs are very luminous in the near-IR, indicating that they have a well developed old stellar population, and that older LSBGs are more frequent in the universe than data from optical bands suggested. | result 0.68 | 0.87 | 0.28 | hedged possibility 0.65 |
| s3 | Second, the near-IR morphologies are often quite different than seen in the optical. | result 1.00 | 0.77 | 0.04 | asserted 0.96 |
| s4 | Third, we find significant trends between the near-IR morphologies of the galaxies and their ratio of HI mass to near-IR luminosity. | result 1.00 | 0.97 | 0.07 | asserted 1.00 |
| s5 | Fourth, we find no trend in disk surface brightness with absolute magnitude, but significant correlations when the bulge surface brightness is used. | result 1.00 | 0.97 | 0.07 | asserted 1.00 |
| s6 | Finally, we find that the formation of a bulge requires a galaxy to have a total baryonic mass above ~ 10**10 Msun. | result 0.96 | 0.93 | 0.21 | asserted 1.00 |
| s7 | A wide variety of other correlations are explored for the sample. | contribution 0.60 | 0.87 | 0.02 | asserted 0.88 |
| s8 | The strongest of our correlations are with the ratio of HI mass to total baryonic mass, MHI/Mbaryonic, which tracks the evolutionary state of the galaxies as they convert gas into stars, and which ranges from 0.05 up to nearly 1 for the galaxies in our sample. | result 0.92 | 0.96 | 0.39 | asserted 1.00 |
| s9 | We see also trends between MHI/Mbaryonic and central surface density, suggesting that increased star formation efficiency with increasing gas surface density strongly drives the conversion of gas into stars. | interpretation 0.76 | 0.92 | 0.20 | hedged possibility 0.88 |
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The paper
Original abstract
(Abridged) We present results for J and Ks near-IR imaging data on a large sample of 88 galaxies drawn from the catalogue of Impey et al. (1996). The near-IR data unveils many features of LSBGs not seen before in the optical. First, a high fraction of the observed LSBGs are very luminous in the near-IR, indicating that they have a well developed old stellar population, and that older LSBGs are more frequent in the universe than data from optical bands suggested. Second, the near-IR morphologies are often quite different than seen in the optical. Third, we find significant trends between the near-IR morphologies of the galaxies and their ratio of HI mass to near-IR luminosity. Fourth, we find no trend in disk surface brightness with absolute magnitude, but significant correlations when the bulge surface brightness is used. Finally, we find that the formation of a bulge requires a galaxy to have a total baryonic mass above ~ 10**10 Msun. A wide variety of other correlations are explored for the sample. The strongest of our correlations are with the ratio of HI mass to total baryonic mass, MHI/Mbaryonic, which tracks the evolutionary state of the galaxies as they convert gas into stars, and which ranges from 0.05 up to nearly 1 for the galaxies in our sample. We see also trends between MHI/Mbaryonic and central surface density, suggesting that increased star formation efficiency with increasing gas surface density strongly drives the conversion of gas into stars.
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