The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer

B. Lo Faro; A. Franceschini; M. Vaccari; G. Rodighiero; A. Feltre; L. Marchetti; L. Silva; S. Berta; D. Lutz; B. Magnelli; P. Popesso; F. Pozzi; S. Wuyts; J. Bock; D. Burgarella; V. Buat; A. Cava; D.L. Clements; M. Rowan-Robinson; A. Cooray; D. Farrah; P. Hurley; S.J. Oliver; I.G. Roseboom; A.J. Smith; L. Wang; E.A.G. Solares; G. Magdis; M.J. Page; M. Symeonidis; D. Rigopoulou; D. Scott

doi:10.1088/0004-637X/762/2/108

The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer

B. Lo Faro, A. Franceschini, M. Vaccari, G. Rodighiero, A. Feltre, L. Marchetti, L. Silva, S. Berta, D. Lutz, B. Magnelli, P. Popesso, F. Pozzi, S. Wuyts, J. Bock, D. Burgarella, V. Buat, A. Cava, D.L. Clements, M. Rowan-Robinson, A. CoorayD. Farrah, P. Hurley, S.J. Oliver, I.G. Roseboom, A.J. Smith, L. Wang, E.A.G. Solares, G. Magdis, M.J. Page, M. Symeonidis, D. Rigopoulou, D. Scott

School of Physics and Astronomy

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Abstract

We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z &thk 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100 yr). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔA &thk 0.81 and 1.14) and higher stellar masses (by Δlog(M) &thk 0.16 and 0.36 dex) for z &thk 1 and z &thk 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through "cirrus" emission (&thk73% and &thk66% of the total LIR for z &thk 1 and z &thk 2 (U)LIRGs, respectively). © 2013. The American Astronomical Society. All rights reserved..

Original language	English
Article number	108
Pages (from-to)	-
Number of pages	13
Journal	Astrophysical Journal
Volume	762
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/762/2/108
Publication status	Published - 10 Jan 2013

Keywords / Materials (for Non-textual outputs)

galaxies: evolution
galaxies: general
galaxies: interactions
galaxies: starburst

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10.1088/0004-637X/762/2/108

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Lo Faro, B., Franceschini, A., Vaccari, M., Rodighiero, G., Feltre, A., Marchetti, L., Silva, L., Berta, S., Lutz, D., Magnelli, B., Popesso, P., Pozzi, F., Wuyts, S., Bock, J., Burgarella, D., Buat, V., Cava, A., Clements, D. L., Rowan-Robinson, M., ... Scott, D. (2013). The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer. Astrophysical Journal, 762(2), -. Article 108. https://doi.org/10.1088/0004-637X/762/2/108

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abstract = "We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z &thk 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100 yr). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔA &thk 0.81 and 1.14) and higher stellar masses (by Δlog(M) &thk 0.16 and 0.36 dex) for z &thk 1 and z &thk 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through {"}cirrus{"} emission (&thk73% and &thk66% of the total LIR for z &thk 1 and z &thk 2 (U)LIRGs, respectively). {\textcopyright} 2013. The American Astronomical Society. All rights reserved..",

keywords = "galaxies: evolution, galaxies: general, galaxies: interactions, galaxies: starburst",

author = "{Lo Faro}, B. and A. Franceschini and M. Vaccari and G. Rodighiero and A. Feltre and L. Marchetti and L. Silva and S. Berta and D. Lutz and B. Magnelli and P. Popesso and F. Pozzi and S. Wuyts and J. Bock and D. Burgarella and V. Buat and A. Cava and D.L. Clements and M. Rowan-Robinson and A. Cooray and D. Farrah and P. Hurley and S.J. Oliver and I.G. Roseboom and A.J. Smith and L. Wang and E.A.G. Solares and G. Magdis and M.J. Page and M. Symeonidis and D. Rigopoulou and D. Scott",

year = "2013",

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day = "10",

doi = "10.1088/0004-637X/762/2/108",

language = "English",

volume = "762",

pages = "--",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

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Lo Faro, B, Franceschini, A, Vaccari, M, Rodighiero, G, Feltre, A, Marchetti, L, Silva, L, Berta, S, Lutz, D, Magnelli, B, Popesso, P, Pozzi, F, Wuyts, S, Bock, J, Burgarella, D, Buat, V, Cava, A, Clements, DL, Rowan-Robinson, M, Cooray, A, Farrah, D, Hurley, P, Oliver, SJ, Roseboom, IG, Smith, AJ, Wang, L, Solares, EAG, Magdis, G, Page, MJ, Symeonidis, M, Rigopoulou, D & Scott, D 2013, 'The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer', Astrophysical Journal, vol. 762, no. 2, 108, pp. -. https://doi.org/10.1088/0004-637X/762/2/108

TY - JOUR

T1 - The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer

AU - Lo Faro, B.

AU - Franceschini, A.

AU - Vaccari, M.

AU - Rodighiero, G.

AU - Feltre, A.

AU - Marchetti, L.

AU - Silva, L.

AU - Berta, S.

AU - Lutz, D.

AU - Magnelli, B.

AU - Popesso, P.

AU - Pozzi, F.

AU - Wuyts, S.

AU - Bock, J.

AU - Burgarella, D.

AU - Buat, V.

AU - Cava, A.

AU - Clements, D.L.

AU - Rowan-Robinson, M.

AU - Cooray, A.

AU - Farrah, D.

AU - Hurley, P.

AU - Oliver, S.J.

AU - Roseboom, I.G.

AU - Smith, A.J.

AU - Wang, L.

AU - Solares, E.A.G.

AU - Magdis, G.

AU - Page, M.J.

AU - Symeonidis, M.

AU - Rigopoulou, D.

AU - Scott, D.

PY - 2013/1/10

Y1 - 2013/1/10

N2 - We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z &thk 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100 yr). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔA &thk 0.81 and 1.14) and higher stellar masses (by Δlog(M) &thk 0.16 and 0.36 dex) for z &thk 1 and z &thk 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through "cirrus" emission (&thk73% and &thk66% of the total LIR for z &thk 1 and z &thk 2 (U)LIRGs, respectively). © 2013. The American Astronomical Society. All rights reserved..

AB - We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z &thk 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100 yr). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔA &thk 0.81 and 1.14) and higher stellar masses (by Δlog(M) &thk 0.16 and 0.36 dex) for z &thk 1 and z &thk 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through "cirrus" emission (&thk73% and &thk66% of the total LIR for z &thk 1 and z &thk 2 (U)LIRGs, respectively). © 2013. The American Astronomical Society. All rights reserved..

KW - galaxies: evolution

KW - galaxies: general

KW - galaxies: interactions

KW - galaxies: starburst

UR - http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-84871583129&md5=96265b59ef40b99220b6b1783cdf1eb5

U2 - 10.1088/0004-637X/762/2/108

DO - 10.1088/0004-637X/762/2/108

M3 - Article

SN - 0004-637X

VL - 762

SP - -

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 108

ER -

The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer

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