Computer Science
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70091m&link_type=abstract
Spitzer Proposal ID #70091
Computer Science
Scientific paper
We propose a snapshot program to observe a large sample of Low Surface Brightness (LSB) galaxies. Galaxies are selected for their extreme LSB nature (with central surface brightness fainter than 23 B mag/[]) and the availability of ancillary data. The Spitzer archive is largely devoid of such galaxies. Many programs have targeted LSB galaxies, but these have usually been objects of intermediate surface brightness (between 22 and 23 B mag/[]). The samples of the large galaxy surveys conducted with Spitzer suffer from the unavoidable selection bias against LSB systems. Our sample goes a considerable way towards remedying this hole in the Spitzer legacy archive. To maximize the utility of these data, LSB galaxies have been further selected to possess at least some ancillary data. These ancillary data may include optical broad band colors (UBVRI), narrow band Halpha photometry, nebular oxygen abundances, and/or detailed velocity fields. Even warm, Spitzer is the ideal instrument to image these low contrast targets in the near infrared. IRAC images of the sample will be used to measure the sum and distribution of stellar mass. This is important to confirming and interpreting the apparent correlation between stellar birthrate and gas mass fraction. They will also be used to construct detailed mass models. The contribution of the stellar component to the radial mass distribution is the largest outstanding uncertainty in the cusp-core problem, a critical test of the LCDM structure formation paradigm. In sum, this project will provide fundamental data with considerable archival value for an important class of objects.
de Blok Erwin
Kuzio de Naray Rachel
McGaugh Stacy
Schombert Jim
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