Abstract
We argue that the observed sample of flat-spectrum galaxies seen in recent deep surveys must contain both early disk systems and early spheroid systems in order to match observed number counts if q o = 0.5. The low average density of neutral hydrogen in damped L α systems at z = 2 − 3 separates the disk formation at z≲2 from spheroid formation at z≲3. Based on color arguments, we assign the period of spheroid formation to z ~ 4. The forming spheroids may ionize the IGM at z = 2.5 − 3.5 and contribute the thermal portion of the diffuse X-ray background. If we are indeed seeing the protospheroid population it must form slowly over the local Hubble time. Furthermore, if q o = 0.5, there must be some subsequent merging to form L * ellipticals. Searches for L α emission and absorption together with U band number counts should decide these questions.
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Cowie, L.L. (1988). Protogalaxies. In: Kaiser, N., Lasenby, A.N. (eds) The Post-Recombination Universe. NATO ASI Series, vol 240. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3035-3_1
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DOI: https://doi.org/10.1007/978-94-009-3035-3_1
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