2010A&A...518L..31I

Query : 2010A&A...518L..31I

2010A&A...518L..31I - Astronomy and Astrophysics, volume 518L31-31 (2010/7-2)

The far-infrared/radio correlation as probed by Herschel.

IVISON R.J., 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.L., CONLEY A., CONVERSI L., COORAY A., DADDI E., DOMINGUEZ H., DOWELL C.D., DWEK E., EALES S., FARRAH D., FOERSTER SCHREIBER N., FOX M., FRANCESCHINI A., GEAR W., GENZEL R., GLENN J., GRIFFIN M., GRUPPIONI C., HALPERN M., HATZIMINAOGLOU E., ISAAK K., LAGACHE G., LEVENSON L., LU N., LUTZ D., MADDEN S., MAFFEI B., MAGDIS G., MAINETTI G., MAIOLINO R., MARCHETTI L., MORRISON G.E., MORTIER A.M.J., NGUYEN H.T., NORDON R., O'HALLORAN B., OLIVER S.J., OMONT A., OWEN F.N., PAGE M.J., PANUZZO P., PAPAGEORGIOU A., PEARSON C.P., PEREZ-FOURNON I., PEREZ GARCIA A.M., POGLITSCH A., POHLEN M., POPESSO P., POZZI F., RAWLINGS J.I., RAYMOND G., RIGOPOULOU D., RIGUCCINI L., RIZZO D., RODIGHIERO G., ROSEBOOM I.G., ROWAN-ROBINSON M., SAINTONGE A., SANCHEZ PORTAL M., SANTINI P., SCHULZ B., SCOTT D., SEYMOUR N., SHAO L., SHUPE D.L., SMITH A.J., STEVENS J.A., STURM E., SYMEONIDIS M., TACCONI L., TRICHAS M., TUGWELL K.E., VACCARI M., VALTCHANOV I., VIEIRA J., VIGROUX L., WANG L., WARD R., WRIGHT G., XU C.K. and ZEMCOV M.

Abstract (from CDS):

We set out to determine the ratio, qIR, of rest-frame 8-1000-µm flux, SIR, to monochromatic radio flux, S1.4GHz, 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=24-1250µm, exploiting data from PACS and SPIRE (PEP; HerMES), as well as Spitzer, SCUBA, AzTEC and MAMBO. We also explore the properties of an LIR-matched sample, designed to reveal evolution of qIR with redshift, spanning log LIR=11-12L☉ 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, qIR, at l1.4∼1022.7W/Hz, 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, 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 ARCADE2, perhaps driven by <10-µJy radio activity amongst ordinary star-forming galaxies at z>1.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: starburst - infrared: galaxies - submillimeter: galaxies - radio continuum: galaxies

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1

Query : 2010A&A...518L..31I

Basic data :
NAME GOODS-N Field -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		12 36 55.0 +62 14 15 [ ] D 2011ApJ...732..126M
FK4 coord. (ep=B1950 eq=1950) : 		12 34 41.1 +62 30 45 [ ]
Gal coord. (ep=J2000) : 		125.8654 +54.8080 [ ]
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NAME GOODS-N Field NAME GOODS North Field NAME GOODS Northern Field NAME GOODS-North Field

References (1364 between 1850 and 2026) (Total 1364)
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