Correlation of Galaxy Types in the 2MASS Redshift Survey with 2MASS/SDSS Colors and HI Content

Details Correlation of Galaxy Types in the 2MASS Redshift Survey with 2MASS/SDSS Colors and HI Content Correlation of Galaxy Types in the 2MASS Redshift Survey with 2MASS/SDSS Colors and HI Content

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9711m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #97.11; Bulletin of the American Astronomical Society, V

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Scientific paper

We selected 1449 galaxies brighter than 11.25 magnitudes from the 2MASS redshift survey which match with galaxies which are also detections in the SDSS DR5 survey. We computed NIR/Optical colors and correlate them with galaxy type. As expected, there is variation of average NIR or optical color with galaxy type: later type spirals are bluer. A subset of 461 of these galaxies also have 21 cm line data available in the literature: for these, NIR/Optical color was correlated with HI content. Also as expected, HI content correlates with galaxy type such that later type spirals have greater HI/L. Since a galaxy's 2 micron luminosity is very well correlated with its baryonic mass in stars this confirms the higher efficiency of star formation in early type spirals. A sample of 2MASS galaxies with no prior HI detections has been observed at the Green Bank Radio Telescope. For this sample, it is shown that optical and IR properties do not conclusively correlate with HI detectability: there is no statistical difference between HI detections and non-detections with any other galaxy property we measured.
This work was supported by NSF grant AST0406906 and made use of the GBT, operated by AUI for the NSF.

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