TiNy Titans

Towards understanding the dwarf galaxy merger sequence

Isolated Dwarf Pairs

Broadband ugriz SDSS images of four isolated dwarf pairs from TiNy Titans covering a range of projected radial separations (R_sep), which are noted along with the velocity separation (v_sep) for each pair. The disturbed morphologies reveal stellar bridges and tails, as well as asymmetrically-distributed blue star forming knots. Given the isolation of these pairs (> 1.5 Mpc from a more massive galaxy), these distortions are not the result of large scale environmental effects and are likely the result of the dwarf-dwarf interaction.

Line Spectra

Broadband SDSS ugriz images (top) and new single-dish Arecibo and GBT HI line spectra (bottom) for the first four isolated dwarf pairs in our sample (in order of projected radial separation). Images are 200′′×200′′. Optical velocities for each pair member are labeled in the image and noted as red vertical lines on each spectrum. Spectra are given in units of km/s and mJy. In cases where we used the HI spectra from ALFALFA (Haynes et al. 2011) in our analysis, the spectrum was obtained from the Cornell Digital HI Archive. Only three pairs have no HI observations. The broadband SDSS images and single-dish HI line spectra for the remaining 57 isolated pairs will be available in the appendix of Stierwalt et al. 2015 after it is accepted for publication.

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Isolated Dwarf Pairs

Line Spectra

TNT survey of low z dwarf pairs identified in SDSS