Mission Overview

Panchromatic Hubble Andromeda Treasury Catalog of High Mass Stars (PHATHIGHMASS)


Primary Investigator:  Christina Lindberg

HLSP Authors:  Christina Lindberg, Claire Murray, Julianne Dalcanton, Josh Peek, Karl Gordon

Released:  2024-01-22

Updated:  2024-01-22

Primary Reference:  Lindberg et al. 2024

DOI:  10.17909/z936-tm54

Citations:  See ADS Statistics

Read Me

Spatial distribution of massive star candidates (n=42,107), colored by their BEAST-derived expected extinction, overlaid on a Spitzer 24-micron dust map.


The team provides a list of 42,107 main-sequence massive star candidates in M31 from the Panchromatic Hubble Andromeda Treasury, along with stellar and line-of-sight extinction estimates from the Bayesian Extinction and Stellar Tool (BEAST; Gordon et al. 2016). The BEAST is an open-source, open-development tool designed to simultaneously fit stellar SEDs and dust extinction of resolved stellar populations using multi-band photometry. These sources were initially selected based on their initial mass estimates from the BEAST (M > 8 Msun). The team removed potential contamination from misfit asymptotic giant branch stars, foreground sources, and duplicate fits using a series of quality cuts detailed in Lindberg et al. (2024).

For details on the photometric observations and reduction, please see Dalcanton et al. (2012), Williams et al. (2014). For details on the stellar and extinction fits from the Bayesian Extinction and Stellar Tool, please see Gordon et al. (2016). For details on the total column density Av extinction measurements, please see Dalcanton et al. (2015). For details on the 21-cm HI integrated line emission and predicted CO (J=3-2) emission, please see Koch et al. (2021) and Smith et al. (2021), respectively.

Data Products

A listing of the columns in the catalog is provided in the README above. The team has added brief descriptions of the general columns there. For further information regarding the BEAST parameters, users should consult the official BEAST documentation.

Download catalog file (~140 MB):



Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work. 

Note: These HLSP data products are licensed for use under CC BY 4.0.