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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Herschel exploitation of local galaxy andromeda (helga). III. the star formation law in M31
Astrophysical Journal, Volume 769, No. 1, Article 55, Year 2013
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Description
We present a detailed study of how the star formation rate (SFR) relates to the interstellar medium (ISM) of M31 at ∼140 pc scales. The SFR is calculated using the far-ultraviolet and 24 μ m emission, corrected for the old stellar population in M31. We find a global value for the SFR of .25 +0.060.04M⊙- yr1 and compare this with the SFR found using the total far-infrared luminosity. There is general agreement in regions where young stars dominate the dust heating. Atomic hydrogen (H i) and molecular gas (traced by carbon monoxide, CO) or the dust mass is used to trace the total gas in the ISM. We show that the global surface densities of SFR and gas mass place M31 among a set of low-SFR galaxies in the plot of Kennicutt. The relationship between SFR and gas surface density is tested in six radial annuli across M31, assuming a power law relationship with index, N. The star formation (SF) law using total gas traced by Hi and CO gives a global index of N = 2.03 ± 0.04, with a significant variation with radius; the highest values are observed in the 10 kpc ring.We suggest that this slope is due to Hi turning molecular at σGas ∼10M⊙pc ∼2. When looking at H2 regions, we measure a higher mean SFR suggesting a better spatial correlation between H2 and SF.We find N ∼0.6 with consistent results throughout the diskthis is at the low end of values found in previous work and argues against a superlinear SF law on small scales. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Ford, George P.
United Kingdom, Cardiff
Cardiff University
Gear, Walter K.P.
United Kingdom, Cardiff
Cardiff University
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Eales, Stephen A.
United Kingdom, Cardiff
Cardiff University
Baes, Maarten
Belgium, Ghent
Universiteit Gent
Bendo, George J.
United Kingdom, Manchester
The University of Manchester
Boquien, Médéric
France, Marseille
Aix Marseille Université
Boselli, Alessandro
France, Marseille
Aix Marseille Université
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
de Looze, Ilse
Belgium, Ghent
Universiteit Gent
Fritz, Jacopo
Belgium, Ghent
Universiteit Gent
Gentile, Gianfranco
Belgium, Ghent
Universiteit Gent
Belgium, Brussels
Vrije Universiteit Brussel
Gomez, Haley L.
United Kingdom, Cardiff
Cardiff University
Gordon, Karl D.
Belgium, Ghent
Universiteit Gent
United States, Baltimore
Space Telescope Science Institute
Kirk, Jason M.
United Kingdom, Cardiff
Cardiff University
Lebouteiller, Vianney
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
O'Halloran, Brian
United Kingdom, London
Imperial College London
Spinoglio, L.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Verstappen, Joris
Belgium, Ghent
Universiteit Gent
Wilson, Christine D.
Canada, Hamilton
Mcmaster University
Statistics
Citations: 64
Authors: 20
Affiliations: 11
Identifiers
Doi:
10.1088/0004-637X/769/1/55
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study