The far-infrared/radio correlation as probed by Herschel
We set out to determine the ratio, qIR, of rest-frame 8-1000-μm flux, SIR, to monochromatic radio flux, S 1.4 GHz, for galaxies selected at far-infrared (IR) and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, Td, and to identify any far-I...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2010
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| _version_ | 1826262372708253696 |
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| author | Ivison, R Magnelli, B Ibar, E Andreani, P Elbaz, D Altieri, B Amblard, A Arumugam, V Auld, R Aussel, H Babbedge, T Berta, S Blain, A Bock, J Bongiovanni, A Boselli, A Buat, V Burgarella, D Castro-Rodriguez, N Cava, A Cepa, J Chanial, P Cimatti, A Cirasuolo, M Clements, D |
| author_facet | Ivison, R Magnelli, B Ibar, E Andreani, P Elbaz, D Altieri, B Amblard, A Arumugam, V Auld, R Aussel, H Babbedge, T Berta, S Blain, A Bock, J Bongiovanni, A Boselli, A Buat, V Burgarella, D Castro-Rodriguez, N Cava, A Cepa, J Chanial, P Cimatti, A Cirasuolo, M Clements, D |
| author_sort | Ivison, R |
| collection | OXFORD |
| description | We set out to determine the ratio, qIR, of rest-frame 8-1000-μm flux, SIR, to monochromatic radio flux, S 1.4 GHz, for galaxies selected at far-infrared (IR) and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, Td, and to identify any far-IR-bright outliers - useful laboratories for exploring why the far-IR/radio correlation (FIRRC) is generally so tight when the prevailing theory suggests variations are almost inevitable. We use flux-limited 250-μm and 1.4-GHz samples, obtained using Herschel and the Very Large Array (VLA) in GOODS-North (-N). We determine bolometric IR output using ten bands spanning λobs = 24-1250 μm, exploiting data from PACS and SPIRE (PEP; HerMES), as well as Spitzer, SCUBA, AzTEC and MAMBO. We also explore the properties of an L IR-matched sample, designed to reveal evolution of qIR with redshift, spanning log LIR = 11-12 L⊙ and z = 0-2, by stacking into the radio and far-IR images. For 1.4-GHz-selected galaxies in GOODS-N, we see tentative evidence of a break in the flux ratio, q IR, at L1.4 GHz ∼ 1022.7 W Hz-1, where active galactic nuclei (AGN) are starting to dominate the radio power density, and of weaker correlations with redshift and Td. From our 250-μm-selected sample we identify a small number of far-IR-bright outliers, and see trends of qIR with L1.4 GHz, LIR, Td and redshift, noting that some of these are inter-related. For our LIR-matched sample, there is no evidence that qIR changes significantly as we move back into the epoch of galaxy formation: we find qIR (1+z)γ, where γ = -0.04±0.03 at z = 0-2; however, discounting the least reliable data at z < 0.5 we find γ = -0.26±0.07, modest evolution which may be related to the radio background seen by ARCADE 2, perhaps driven by <10-μJy radio activity amongst ordinary star-forming galaxies at z>1. © ESO 2010. |
| first_indexed | 2024-03-06T19:35:24Z |
| format | Journal article |
| id | oxford-uuid:1ee02d57-f336-4c45-8676-498dd4fa5e50 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:35:24Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:1ee02d57-f336-4c45-8676-498dd4fa5e502022-03-26T11:18:45ZThe far-infrared/radio correlation as probed by HerschelJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1ee02d57-f336-4c45-8676-498dd4fa5e50EnglishSymplectic Elements at Oxford2010Ivison, RMagnelli, BIbar, EAndreani, PElbaz, DAltieri, BAmblard, AArumugam, VAuld, RAussel, HBabbedge, TBerta, SBlain, ABock, JBongiovanni, ABoselli, ABuat, VBurgarella, DCastro-Rodriguez, NCava, ACepa, JChanial, PCimatti, ACirasuolo, MClements, DWe set out to determine the ratio, qIR, of rest-frame 8-1000-μm flux, SIR, to monochromatic radio flux, S 1.4 GHz, for galaxies selected at far-infrared (IR) and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, Td, and to identify any far-IR-bright outliers - useful laboratories for exploring why the far-IR/radio correlation (FIRRC) is generally so tight when the prevailing theory suggests variations are almost inevitable. We use flux-limited 250-μm and 1.4-GHz samples, obtained using Herschel and the Very Large Array (VLA) in GOODS-North (-N). We determine bolometric IR output using ten bands spanning λobs = 24-1250 μm, exploiting data from PACS and SPIRE (PEP; HerMES), as well as Spitzer, SCUBA, AzTEC and MAMBO. We also explore the properties of an L IR-matched sample, designed to reveal evolution of qIR with redshift, spanning log LIR = 11-12 L⊙ and z = 0-2, by stacking into the radio and far-IR images. For 1.4-GHz-selected galaxies in GOODS-N, we see tentative evidence of a break in the flux ratio, q IR, at L1.4 GHz ∼ 1022.7 W Hz-1, where active galactic nuclei (AGN) are starting to dominate the radio power density, and of weaker correlations with redshift and Td. From our 250-μm-selected sample we identify a small number of far-IR-bright outliers, and see trends of qIR with L1.4 GHz, LIR, Td and redshift, noting that some of these are inter-related. For our LIR-matched sample, there is no evidence that qIR changes significantly as we move back into the epoch of galaxy formation: we find qIR (1+z)γ, where γ = -0.04±0.03 at z = 0-2; however, discounting the least reliable data at z < 0.5 we find γ = -0.26±0.07, modest evolution which may be related to the radio background seen by ARCADE 2, perhaps driven by <10-μJy radio activity amongst ordinary star-forming galaxies at z>1. © ESO 2010. |
| spellingShingle | Ivison, R Magnelli, B Ibar, E Andreani, P Elbaz, D Altieri, B Amblard, A Arumugam, V Auld, R Aussel, H Babbedge, T Berta, S Blain, A Bock, J Bongiovanni, A Boselli, A Buat, V Burgarella, D Castro-Rodriguez, N Cava, A Cepa, J Chanial, P Cimatti, A Cirasuolo, M Clements, D The far-infrared/radio correlation as probed by Herschel |
| title | The far-infrared/radio correlation as probed by Herschel |
| title_full | The far-infrared/radio correlation as probed by Herschel |
| title_fullStr | The far-infrared/radio correlation as probed by Herschel |
| title_full_unstemmed | The far-infrared/radio correlation as probed by Herschel |
| title_short | The far-infrared/radio correlation as probed by Herschel |
| title_sort | far infrared radio correlation as probed by herschel |
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