2025MNRAS.538.1884M

Query : 2025MNRAS.538.1884M

2025MNRAS.538.1884M - Mon. Not. R. Astron. Soc., 538, 1884-1905 (2025/April-2)

Nebular emission from composite star-forming galaxies - I. A novel modelling approach.

MORISSET C., CHARLOT S., SANCHEZ S.F., ESPINOSA-PONCE C., BARAT E. and DAUTREMER T.

Abstract (from CDS):

We introduce a novel approach to modelling the nebular emission from star-forming galaxies by combining the contributions from many H II regions incorporating loose trends in physical properties, random dust attenuation, a predefined H$\alpha$ luminosity function, and a diffuse ionized-gas component. Using a machine-learning-based regression artificial neural network trained on a grid of models generated by the photoionization code CLOUDY, we efficiently predict emission-line properties of individual H II regions over a wide range of physical conditions. We generate 250 000 synthetic star-forming galaxies composed of up to 3000 H II regions and explore how variations in parameters affect their integrated emission-line properties. Our results highlight systematic biases in oxygen-abundance estimates derived using traditional methods, emphasizing the importance of accounting for the composite nature of star-forming galaxies when interpreting integrated nebular emission. Future work will leverage this approach to explore in detail its impact on parameter estimates of star-forming galaxies.

Abstract Copyright: © 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): software: machine learning - software: simulations - HII regions - galaxies: abundances

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1

Query : 2025MNRAS.538.1884M

Basic data :
M 74 -- Galaxy
Other object types: otypes_help 		G (2011MNRAS,LEDA,...), IR (IRAS,ISOSS,...), X (2E,[CHP2004]), Rad (GB6,87GB), AG? (2020MNRAS), * (Gaia), HI (HIPASS), NIR (2MASS)
ICRS coord. (ep=J2000) : 		01 36 41.7451236624 +15 47 01.107512304 (Optical) [ 0.3927 0.2965 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		01 34 00.4220405956 +15 31 44.419791106 [ 0.3927 0.2965 90 ]
Gal coord. (ep=J2000) : 		138.6168076727335 -45.7052708002080 [ 0.3927 0.2965 90 ]
Proper motions mas/yr : 		0.344 -0.229 [0.528 0.345 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 658 [3] / z(emission) 0.002197 [0.000010] / cz 658.72 [3.00]
   (Rad) C 2022ApJS..261...21Y
Morphological type: 		Sc C 2019MNRAS.485.1477K
Angular size (arcmin): 		6.70395 6.653 103 (Opt) B 2023ApJS..269....3M
Fluxes (11) :
U (AB) 10.52 [0.03] C 2014MNRAS.445..881C
B (AB) 10.00 [0.03] C 2014MNRAS.445..881C
V (AB) 9.46 [0.03] C 2014MNRAS.445..881C
R (AB) 9.16 [0.03] C 2014MNRAS.445..881C
G 18.456566 [0.007474] C 2020yCat.1350....0G
J 7.629 [0.029] C 2006AJ....131.1163S
H 7.041 [0.034] C 2006AJ....131.1163S
K 6.845 [0.054] C 2006AJ....131.1163S
g (AB) 10.1578 [0.0002] B 2023ApJS..269....3M
r (AB) 9.5453 [0.0002] B 2023ApJS..269....3M
z (AB) 9.0499 [0.0002] B 2023ApJS..269....3M
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 2395 		: 6 Display criteria :

Identifiers (26) :
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M 74 IRAS 01340+1532 PSCz Q01340+1532 [CHP2004] J013641.7+154701
2E 440 ISOSS J01366+1547 TC 18 [M98c] 013400.7+153155
2E 0134.0+1531 LEDA 5974 TIC 405375557 [SLK2004] 223
GB6 B0134+1531 2MASS J01364173+1547008 UGC 1149 [VDD93] 8
87GB 013400.0+153119 2MASX J01364177+1547004 UZC J013641.7+154659 Gaia DR3 2589380639673817728
HIPASS J0136+15 MCG+03-05-011 Z 0134.0+1532
IRAS F01339+1532 NGC 628 Z 460-14

References (1934 between 1850 and 2026) (Total 1934)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 13    Distance : 9    PM : 1   

   

Observing logs
Herschel : 19    ISO : 14   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : M 74

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2E 440 HIPASS J0136+15 IRAS F01339+1532 IRAS 01340+1532 2MASS J01364173+1547008
2MASX J01364177+1547004 NGC 628 UGC 1149 Gaia DR3 2589380639673817728

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