The Hubble Space Telescope captures various astronomical images, often featuring many galaxies in the background. Whether these galaxies are catalogued can depend on several factors, such as the purpose of the observation and the specific region of the sky being imaged. Galaxies in Hubble photographs may or may not be catalogued depending on past astronomical surveys such as the Sloan Digital Sky Survey (SDSS) or specific projects like the Hubble Deep Field.
For a precise determination, you would need to compare the coordinates and features of the galaxies in the image against existing astronomical catalogs such as the NASA/IPAC Extragalactic Database (NED) or the SIMBAD astronomical database. It’s important to note that while some background galaxies in Hubble images might be cataloged, others could be newly identified due to the telescope’s ability to observe faint structures, hence not yet included in any database. If your research indicates they are not catalogued and you are seeking verification, examining multiple databases or consulting with an astronomer specializing in extragalactic studies might provide additional insight and confirmation for your publication.