HST photometry shows that four mid-IR-selected AGN candidates in dwarf galaxies actually host very young, massive, dusty nuclear star clusters that likely fake the AGN signature.
Formation of the First Black Holes: Current observational status
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abstract
In this chapter, we review the current observational status of the first supermassive black holes. It is clear that such a review can hardly be complete, due to the wealth of surveys that has been pursued, including different wavelengths and different observational techniques. This chapter will focus on the main results that have been obtained, considering the detections of z~6 supermassive black holes in large surveys such as SDSS, CFHQS and Pan-STARRS. In addition, we will discuss upper limits and constraints on the population of the first black holes that can be derived from observational data, in particular in the X-ray regime, as these provide additional relevant information for the comparison with formation scenarios.
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Star-Forming Nuclear Clusters in Dwarf Galaxies Mimicking AGN Signatures in the Mid-Infrared
HST photometry shows that four mid-IR-selected AGN candidates in dwarf galaxies actually host very young, massive, dusty nuclear star clusters that likely fake the AGN signature.