On the Detection of Supermassive Primordial Stars. II. Blue Supergiants

Understand

Supermassive primordial stars in hot, atomically-cooling haloes at $z \sim$ 15 - 20 may have given birth to the first quasars in the universe.

• Most simulations of these rapidly accreting stars suggest that they are red, cool hypergiants, but more recent models indicate that some may have been bluer and hotter, with surface temperatures of 20,000 - 40,000 K.
• These stars have spectral features that are quite distinct from those of cooler stars and may have different detection limits in the near infrared (NIR) today.
• Here, we present spectra and AB magnitudes for hot, blue supermassive primordial stars calculated with the TLUSTY and CLOUDY codes.