Are There Blue, Massive Elliptical Galaxies at z < 1?: Kinematics of Blue Spheroidal Galaxy Candidates

Details Are There Blue, Massive Elliptical Galaxies at z < 1?: Kinematics of Blue Spheroidal Galaxy Candidates Are There Blue, Massive Elliptical Galaxies at z < 1?: Kinematics of Blue Spheroidal Galaxy Candidates

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.9309i&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #93.09; Bulletin of the American Astronomical Society, Vol. 33, p.1180

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Several recent studies find that 10 - 50% of morphologically selected field early-type galaxies at redshifts z < 1 have blue colors indicative of recent star formation. Such ``blue spheroids'' might be massive early-type galaxies with active star formation, perhaps induced by recent merger events. Alternatively, they could be starbursting, low-mass spheroids. To distinguish between these two choices, we have selected 10 ``Blue Spheroid Candidates'' (hereafter, BSCs) from a quantitatively selected E/S0 sample, and study their properties, including kinematics from Keck spectra obtained as part of the DEEP Groth Strip Survey. Most BSCs (70%) turn out to belong to two broad categories, while the remaining objects are likely to be misclassified objects. Type-1 BSCs have underlying red stellar components with bluer inner components. Type-2 BSCs do not show an obvious sign of the underlying red stellar component, and their overall colors are quite blue ((U-B)rest < 0). Both Type-1 and Type-2 BSCs have internal velocity dispersions measured from emission lines σ < ~ 80 km sec-1 and estimated dynamical masses of only a few 1010Msolar or less. For Type-1 BSCs, we estimate σ of the red component using the fundamental plane relation of distant field absorption-line galaxies and find that these σ estimates are similar to the σ measured from emission lines. Overall, we conclude that our Type-1 and Type-2 BSCs are more likely to be star-forming low mass spheroids than star-forming, massive, early-type galaxies. Funding for DEEP is provided by NSF grant AST-9529098. Support for this work was also provided by NASA through a grant, HST-AR-08767.04-A, from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

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