2022MNRAS.509..522O


Query : 2022MNRAS.509..522O

2022MNRAS.509..522O - Mon. Not. R. Astron. Soc., 509, 522-549 (2022/January-1)

Synthetic photometry of OB star clusters with stochastically sampled IMFs: analysis of models and HST observations.

OROZCO-DUARTE R., WOFFORD A., VIDAL-GARCIA A., BRUZUAL G., CHARLOT S., KRUMHOLZ M.R., HANNON S., LEE J., WOFFORD T., FUMAGALLI M., DALE D., MESSA M., GREBEL E.K., SMITH L., GRASHA K. and COOK D.

Abstract (from CDS):

We present a pilot library of synthetic NUV, U, B, V, and I photometry of star clusters with stochastically sampled IMFs and ionized gas for initial masses, Mi = 103, 104, and 105 M; t = 1, 3, 4, and 8 Myr; Z = 0.014 and Z = 0.002; and log(US) = -2 and -3. We compare the library with predictions from deterministic models and observations of isolated low-mass (<104 M) star clusters with co-spatial compact H II regions. The clusters are located in NGC 7793, one of the nearest galaxies observed as part of the HST LEGUS and Hα-LEGUS surveys. (1) For model magnitudes that only account for the stars: (a) the residual |deterministic mag - median stochastic mag| can be >=0.5 mag, even for Mi = 105 M; and (b) the largest spread in stochastic magnitudes occurs when Wolf-Rayet stars are present. (2) For Mi = 105 M: (a) the median stochastic mag with gas can be >1.0 mag more luminous than the median stochastic magnitude without gas; and (b) nebular emission lines can contribute with > 50 per cent and > 30 per cent to the total emission in the V and I bands, respectively. (3) Age-dating OB-star clusters via deterministic tracks in the U-B versus V-I plane is highly uncertain at Z = 0.014 for Mi ∼ 103 M and Z = 0.002 for Mi ∼ 103-105 M. (4) For low-mass clusters, the V-band extinction derived with stochastic models significantly depends on the value of log(US). (5) The youngest clusters tend to have higher extinction. (6) The majority of clusters have multi-peaked age PDFs. (7) Finally, we discuss the importance of characterizing the true variance in the number of stars per mass bin in nature.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): methods: data analysis - stars: luminosity function, mass function - (ISM:) HII regions - galaxies: ISM - galaxies: stellar content

Status at CDS : Examining the need for a new acronym.

Simbad objects: 7

goto Full paper

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12558 1
2 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 504 0
3 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1710 1
4 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 955 1
5 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4306 4
6 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1094 2
7 NAME Local Group GrG ~ ~           ~ 8311 0

To bookmark this query, right click on this link: simbad:objects in 2022MNRAS.509..522O and select 'bookmark this link' or equivalent in the popup menu