GAMA/H-ATLAS: the ultraviolet spectral slope and obscuration in galaxies
| Autor: | Jacopo Fritz, Denis Hill, B. Nichol, Pasquale Temi, Carlos S. Frenk, M. L. P. Gunawardhana, D. Wijesinghe, Edo Ibar, Asantha Cooray, Rob Sharp, Michał J. Michałowski, Simon Dye, S. Buttiglione, Matthew Prescott, Simon P. Driver, Steven P. Bamford, G. DeZotti, Joss Bland-Hawthorn, Sarah Brough, Edward N. Taylor, E. Andrae, Elisabete da Cunha, Ivan K. Baldry, Mark Seibert, E. E. Rigby, H Parkinson, Peder Norberg, Aliakbar Dariush, Rob Ivison, Daniel Thomas, M. Pohlen, Cristina Popescu, Konrad Kuijken, Stephen Anthony Eales, B. F. Madore, Steve Maddox, E. van Kampen, G. Rodighiero, Elaine M. Sadler, Jon Loveday, Matt J. Jarvis, Scott M. Croom, D. H. P. Jones, Loretta Dunne, Lee S. Kelvin, Maarten Baes, Richard J. Tuffs, Antonio Cava, Ewan Cameron, Andrew M. Hopkins, Kevin A. Pimbblet, P. van der Werf, William J. Sutherland, Aaron S. G. Robotham, Enzo Pascale, Christopher J. Conselice, Stephen Serjeant, Jochen Liske, John A. Peacock, Robbie Richard Auld, Daniel J. Smith, R. Hopwood |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
010308 nuclear & particles physics Star formation Balmer series Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics medicine.disease_cause 01 natural sciences Redshift Galaxy Luminosity symbols.namesake Far infrared Space and Planetary Science 0103 physical sciences Spectral slope medicine symbols Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Ultraviolet |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 415:1002-1012 |
| ISSN: | 0035-8711 |
| Popis: | We use multiwavelength data from the Galaxy And Mass Assembly (GAMA) and Herschel ATLAS (H-ATLAS) surveys to compare the relationship between various dust obscuration measures in galaxies. We explore the connections between the ultraviolet (UV) spectral slope, $\beta$, the Balmer decrement, and the far infrared (IR) to $150\,$nm far ultraviolet (FUV) luminosity ratio. We explore trends with galaxy mass, star formation rate (SFR) and redshift in order to identify possible systematics in these various measures. We reiterate the finding of other authors that there is a large scatter between the Balmer decrement and the $\beta$ parameter, and that $\beta$ may be poorly constrained when derived from only two broad passbands in the UV. We also emphasise that FUV derived SFRs, corrected for dust obscuration using $\beta$, will be overestimated unless a modified relation between $\beta$ and the attenuation factor is used. Even in the optimum case, the resulting SFRs have a significant scatter, well over an order of magnitude. While there is a stronger correlation between the IR to FUV luminosity ratio and $\beta$ parameter than with the Balmer decrement, neither of these correlations are particularly tight, and dust corrections based on $\beta$ for high redshift galaxy SFRs must be treated with caution. We conclude with a description of the extent to which the different obscuration measures are consistent with each other as well as the effects of including other galactic properties on these correlations. |
| Databáze: | OpenAIRE |
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