Measures of star formation rates from infrared (Herschel) and UV (GALEX) emissions of galaxies in the HerMES fields
| Title | Measures of star formation rates from infrared (Herschel) and UV (GALEX) emissions of galaxies in the HerMES fields |
| Publication Type | Journal Article |
| Year of Publication | 2010 |
| Authors | Buat, V, Giovannoli, E, Burgarella, D, Altieri, B, Amblard, A, Arumugam, V, Aussel, H, Babbedge, T, Blain, A, Bock, J, Boselli, A, Castro-Rodriguez, N, Cava, A, Chanial, P, Clements, DL, Conley, A, Conversi, L, Cooray, A, Dowell, CD, Dwek, E, Eales, S, Elbaz, D, Fox, M, Franceschini, A, Gear, W, Glenn, J, Griffin, M, Halpern, M, Hatziminaoglou, E, Heinis, S, Ibar, E, Isaak, K, Ivison, RJ, Lagache, G, Levenson, L, Lonsdale, CJ, Lu, N, Madden, S, Maffei, B, Magdis, G, Mainetti, G, Marchetti, L, Morrison, GE, Nguyen, HT, O'Halloran, B, Oliver, SJ, Omont, A, Owen, FN, Page, MJ, Pannella, M, Panuzzo, P, Papageorgiou, A, Pearson, CP, Perez-Fournon, I, Pohlen, M, Rigopoulou, D, Rizzo, D, Roseboom, IG, Rowan-Robinson, M, Portal, MS, Schulz, B, Seymour, N, Shupe, DL, Smith, AJ, Stevens, JA, Strazzullo, V, Symeonidis, M, Trichas, M, Tugwell, KE, Vaccari, M, Valiante, E, Valtchanov, I, Vigroux, L, Wang, L, Ward, R, Wright, G, Xu, CK, Zemcov, M |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 409 |
| Pagination | L1-L6 |
| Date Published | Nov |
| ISBN Number | 0035-8711 |
| Accession Number | WOS:000289831700001 |
| Abstract | The reliability of infrared (IR) and ultraviolet (UV) emissions to measure star formation rates (SFRs) in galaxies is investigated for a large sample of galaxies observed with the Spectral and Photometric Imaging Receiver (SPIRE) and the Photodetector ArrayCamera and Spectrometer (PACS) instruments on Herschel as part of the Herschel Multi-Tiered Extragalactic Survey (HerMES) project. We build flux-limited 250-mu m samples of sources at redshift z < 1, cross-matched with the Spitzer/MIPS and GALEX catalogues. About 60 per cent of the Herschel sources are detected in UV. The total IR luminosities, L-IR, of the sources are estimated using a spectral energy distribution (SED) fitting code that fits to fluxes between 24 and 500 mu m. Dust attenuation is discussed on the basis of commonly used diagnostics: the L-IR/L-UV ratio and the slope, beta, of the UV continuum. A mean dust attenuation A(UV) of similar or equal to 3 mag is measured in the samples. L-IR/L-UV is found to correlate with L-IR. Galaxies with L-IR > 10(11) L-circle dot and 0.5 < z < 1 exhibit a mean dust attenuation A(UV) of about 0.7 mag lower than that found for their local counterparts, although with a large dispersion. Our galaxy samples span a large range of beta and L-IR/L-UV values which, for the most part, are distributed between the ranges defined by the relations found locally for starburst and normal star-forming galaxies. As a consequence the recipe commonly applied to local starbursts is found to overestimate the dust attenuation correction in our galaxy sample by a factor of similar to 2-3. The SFRs deduced from L-IR are found to account for about 90 per cent of the total SFR; this percentage drops to 71 per cent for galaxies with SFR < 1M(circle dot) yr(-1) (or L-IR < 10(10) L-circle dot). For these faint objects, one needs to combine UV and IR emissions to obtain an accurate measure of the SFR. |
