README file for the Panchromatic Hubble Andromeda Treasury Catalog of High Mass Stars (PHATHIGHMASS) MAST webpage: https://archive.stsci.edu/hlsp/phathighmass/ Refer to this HLSP with DOI: http://dx.doi.org/10.17909/z936-tm54 Contributor - Christina Willecke Lindberg (JHU) - Claire Murray (STScI) - Julianne Dalcanton (CCA Flatiron, UW) - Josh Peek (STScI) - Karl Gordon (STScI) General Information 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). What is Being Released - 1 CSV catalog of photometric 42,107 sources - this "README" file Publications A description of the quality cuts used to produce this catalog is given in: - Lindberg, C. et al. 2024, Dust around massive stars is agnostic to galactic environment: New insights from PHAT/BEAST, ApJ (accepted). How the Catalog Was Prepared 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. Column Descriptions for the Catalog A listing of the columns in the catalog is provided below. The team has added brief descriptions of the general columns here. For further information regarding the BEAST parameters, users should consult the official BEAST documentation (https://beast-docs.readthedocs.io/en/latest). General Parameters - Name: IAU suggested naming scheme used (example: PHAT J113759.63+421022.03) - RA: right ascension from photometry catalog - DEC: declination from photometry catalog - k30: KDE stellar density of massive stars using k=30 pc - k100: KDE stellar density of massive stars using k=100 pc - k300: KDE stellar density of massive stars using k=300 pc - rad_dist: radial distance from the center of M31 in units of kpc - nearest_d: distance to other nearest massive star in catalog in units of pc - D15_Av: median of log-normal A(V) fit derived from PHAT RGB stars; corresponding total column density extinction from Dalcanton+15 - D15_sigma: sigma of log-normal A(V) fit derived from PHAT RGB stars; corresponding total column density extinction from Dalcanton+15 - K21_HI: corresponding HI 21-cm integrated intensity emission from Koch+21 in units of K km/(s) - S21_CO: corresponding predicted CO(J=3-2) line flux from the HASHTAG survey (Smith+21) in units of K km/(s) Fluxes - HST_WFC3_F275W: fluxes in units of ergs/(cm^2 s A) - HST_WFC3_F336W: fluxes in units of ergs/(cm^2 s A) - HST_ACS_WFC_F475W: fluxes in units of ergs/(cm^2 s A) - HST_ACS_WFC_F814W: fluxes in units of ergs/(cm^2 s A) - HST_WFC3_F110W: fluxes in units of ergs/(cm^2 s A) - HST_WFC3_F160W: fluxes in units of ergs/(cm^2 s A) Vega Magnitudes - F275W_VEGA: apparent magnitude derived from fluxes - F336W_VEGA: apparent magnitude derived from fluxes - F475W_VEGA: apparent magnitude derived from fluxes - F814W_VEGA: apparent magnitude derived from fluxes - F110W_VEGA: apparent magnitude derived from fluxes - F160W_VEGA: apparent magnitude derived from fluxes BEAST Fitted and derived parameter suffixes - X_Exp: expectation value (average weighted by 1D PDF) - X_p50: 50th percentile from 1D PDF - X_p16: 16th percentile from 1D PDF (p50-p16 is proxy for -1 sigma) - X_p84: 84th percentile from 1D PDF (p84-p50 is proxy for +1 sigma) - X_Best: single best BEAST model fit value from chi2min BEAST Dust Parameters - Av: A(V) visual extinction in magnitudes - Rv: R(V) = A(V)/E(B-V) = ratio of total to selective extinction - f_A: fraction in extinction curve from A component (MW) - Rv_A: R(V)_A = R(V) of A component of BEAST R(V)-f_A model of extinction curves BEAST Stellar Parameters - M_ini: initial stellar mass (in solar masses) - logA: log10 of the stellar age (in years) - Z: stellar metallicity - M_act: current stellar mass (in solar masses) - logL: log10 of the stellar luminosity (in solar luminosities) - logT: log10 of the stellar effective temperature (in Kelvin) - logg: log10 of the stellar surface gravity (cm s^-2) - mbol: bolometric magnitude - radius: stellar radius (in solar radii) BEAST Goodness-of-fit Metrics - Pmax: maximum probability of nD PDF - Pmax_indx: index in BEAST model grid corresponding to Pmax - specgrid_indx: index in spectroscopic grid corresponding to Pmax - chi2min: minimum value of chisqr - chi2min_indx: index in BEAST model grid corresponding to chi2min BEAST Predicted Fluxes - logHST_WFC3_FXXXW_nd: log10 of the unextinguished (no dust) predicted flux for filters from WFC3 - logHST_WFC3_FXXXW_wd: log10 of the extinguished (with dust) predicted flux for filters from WFC3 - logHST_ACS_WFC_FXXXW_nd: log10 of the unextinguished (no dust) predicted flux for filters from ACS WFC - logHST_ACS_WFC_FXXXW_wd: log10 of the extinguished (with dust) predicted flux for filters from ACS WFC - logGALEX_FUV_nd: log10 of the unextinguished (no dust) GALEX FUV predicted flux - logGALEX_FUV_wd: log10 of the extinguished (with dust) GALEX FUV predicted flux - logGALEX_NUV_nd: log10 of the unextinguished (no dust) GALEX NUV predicted flux - logGALEX_NUV_wd: log10 of the extinguished (with dust) GALEX NUV predicted flux - logF_UV_6_13e_nd: log10 of the unextinguished (no dust) predicted flux between 6 and 13 eV - logF_UV_6_13e_wd: log10 of the extinguished (with dust) predicted flux between 6 and 13 eV