which came first, the black hole or the galaxy?

The AAS is off to a good start:

Reines et al have found a good supermassive black hole candidate in Henize 2-10 - an irregular bulgeless dwarf galaxy about 10 Mpc away.

A dwarf irregular, with a diameter of only about 1 kpc, Henize 2 is in starburst. It contains a number of
massive, very young super star clusters.
SMBH are seen in almost every galaxy and, in the local universe, are correlated with the galactic bulge mass.
One of the open issues is which came first, the black hole or the galaxy.

Henize is bulgeless, and if it genuinely has a real SMBH, that would strongly hint that the black hole comes first and the
galaxy assembles around it later.

He 2-10

The evidence for the SMBH is indirect, strong radio source near the middle of the galaxy, found at the NRAOs VLA, and
followup observations by Chandra showing a high energy x-ray source at the same location, suggestive of a low luminosity
active galactic nucleus with a jet.

The authors suggest an estimate black hole mass of about a million solar masses.
If this is the case, it also suggests that at least some supermassive black holes form directly with
masses of hundreds of thousand of solar masses, through some direct collapse mechanism, rather than growing
slowly from a lower mass seed black hole.

click to embiggen

An actively accreting massive black hole in the dwarf starburst galaxy Henize 2-10, Reines, Sivakoff, Johnson and Brogan, Nature 2011

NRAO press release