2014A&A...566A..55P

Query : 2014A&A...566A..55P

2014A&A...566A..55P - Astronomy and Astrophysics, volume 566A, 55-55 (2014/6-1)

Planck intermediate results. XVII. Emission of dust in the diffuse interstellar medium from the far-infrared to microwave frequencies.

PLANCK COLLABORATION, ABERGEL A., ADE P.A.R., AGHANIM N., ALVES M.I.R., ANIANO G., ARNAUD M., ASHDOWN M., AUMONT J., BACCIGALUPI C., BANDAY A.J., BARREIRO R.B., BARTLETT J.G., BATTANER E., BENABED K., BENOIT-LEVY A., BERNARD J.-P., BERSANELLI M., BIELEWICZ P., BOBIN J., BONALDI A., BOND J.R., BOUCHET F.R., BOULANGER F., BURIGANA C., CARDOSO J.-F., CATALANO A., CHAMBALLU A., CHIANG H.C., CHRISTENSEN P.R., CLEMENTS D.L., COLOMBI S., COLOMBO L.P.L., COUCHOT F., CRILL B.P., CUTTAIA F., DANESE L., DAVIS R.J., DE BERNARDIS P., DE ROSA A., DE ZOTTI G., DELABROUILLE J., DESERT F.-X., DICKINSON C., DIEGO J.M., DOLE H., DONZELLI S., DORE O., DOUSPIS M., DUPAC X., EFSTATHIOU G., ENSSLIN T.A., ERIKSEN H.K., FALGARONE E., FINELLI F., FORNI O., FRAILIS M., FRANCESCHI E., GALEOTTA S., GANGA K., GHOSH T., GIARD M., GIRAUD-HERAUD Y., GONZALEZ-NUEVO J., GORSKI K.M., GREGORIO A., GRUPPUSO A., GUILLET V., HANSEN F.K., HARRISON D., HELOU G., HENROT-VERSILLE S., HERNANDEZ-MONTEAGUDO C., HERRANZ D., HILDEBRANDT S.R., HIVON E., HOBSON M., HOLMES W.A., HORNSTRUP A., HOVEST W., HUFFENBERGER K.M., JAFFE A.H., JAFFE T.R., JONCAS G., JONES A., JONES W.C., JUVELA M., KALBERLA P., KEIHAENEN E., KERP J., KESKITALO R., KISNER T.S., KNEISSL R., KNOCHE J., KUNZ M., KURKI-SUONIO H., LAGACHE G., LAEHTEENMAEKI A., LAMARRE J.-M., LASENBY A., LAWRENCE C.R., LEONARDI R., LEVRIER F., LIGUORI M., LILJE P.B., LINDEN-VORNLE M., LOPEZ-CANIEGO M., LUBIN P.M., MACIAS-PEREZ J.F., MAFFEI B., MAINO D., MANDOLESI N., MARIS M., MARSHALL D.J., MARTIN P.G., MARTINEZ-GONZALEZ E., MASI S., MASSARDI M., MATARRESE S., MAZZOTTA P., MELCHIORRI A., MENDES L., MENNELLA A., MIGLIACCIO M., MITRA S., MIVILLE-DESCHENES M.-A., MONETI A., MONTIER L., MORGANTE G., MORTLOCK D., MUNSHI D., MURPHY J.A., NASELSKY P., NATI F., NATOLI P., NOVIELLO F., NOVIKOV D., NOVIKOV I., OXBORROW C.A., PAGANO L., PAJOT F., PAOLETTI D., PASIAN F., PERDEREAU O., PEROTTO L., PERROTTA F., PIACENTINI F., PIAT M., PIERPAOLI E., PIETROBON D., PLASZCZYNSKI S., POINTECOUTEAU E., POLENTA G., PONTHIEU N., POPA L., PRATT G.W., PRUNET S., PUGET J.-L., RACHEN J.P., REACH W.T., REBOLO R., REINECKE M., REMAZEILLES M., RENAULT C., RICCIARDI S., RILLER T., RISTORCELLI I., ROCHA G., ROSSET C., ROUDIER G., RUSHOLME B., SANDRI M., SAVINI G., SPENCER L.D., STARCK J.-L., SUREAU F., SUTTON D., SUUR-USKI A.-S., SYGNET J.-F., TAUBER J.A., TERENZI L., TOFFOLATTI L., TOMASI M., TRISTRAM M., TUCCI M., UMANA G., VALENZIANO L., VALIVIITA J., VAN TENT B., VERSTRAETE L., VIELVA P., VILLA F., WADE L.A., WANDELT B.D., WINKEL B., YVON D., ZACCHEI A. and ZONCA A.

Abstract (from CDS):

The dust-HI correlation is used to characterize the emission properties of dust in the diffuse interstellar medium (ISM) from far infrared wavelengths to microwave frequencies. The field of this investigation encompasses the part of the southern sky best suited to study the cosmic infrared and microwave backgrounds. We cross-correlate sky maps from Planck, the Wilkinson Microwave Anisotropy Probe (WMAP), and the diffuse infrared background experiment (DIRBE), at 17 frequencies from 23 to 3000GHz, with the Parkes survey of the 21cm line emission of neutral atomic hydrogen, over a contiguous area of 7500deg² centred on the southern Galactic pole. We present a general methodology to study the dust-HI correlation over the sky, including simulations to quantify uncertainties. Our analysis yields four specific results. (1) We map the temperature, submillimetre emissivity, and opacity of the dust per H-atom. The dust temperature is observed to be anti-correlated with the dust emissivity and opacity. We interpret this result as evidence of dust evolution within the diffuse ISM. The mean dust opacity is measured to be (7.1 ±0.6)x10^–27(cm²/H)x(ν/353GHz)^1.53±0.03 for 100≤ν≤353GHz. This is a reference value to estimate hydrogen column densities from dust emission at submillimetre and millimetre wavelengths. (2) We map the spectral index β_mm of dust emission at millimetre wavelengths (defined here as ν≤353GHz), and find it to be remarkably constant at β_mm=1.51±0.13. We compare it with the far infrared spectral index β_FIR derived from greybody fits at higher frequencies, and find a systematic difference, β_mm-β_FIR=-0.15, which suggests that the dust spectral energy distribution (SED) flattens at ν≤353GHz. (3) We present spectral fits of the microwave emission correlated with HI from 23 to 353GHz, which separate dust and anomalous microwave emission (AME). We show that the flattening of the dust SED can be accounted for with an additional component with a blackbody spectrum. This additional component, which accounts for (26±6)% of the dust emission at 100GHz, could represent magnetic dipole emission. Alternatively, it could account for an increasing contribution of carbon dust, or a flattening of the emissivity of amorphous silicates, at millimetre wavelengths. These interpretations make different predictions for the dust polarization SED. (4) We analyse the residuals of the dust-HI correlation. We identify a Galactic contribution to these residuals, which we model with variations of the dust emissivity on angular scales smaller than that of our correlation analysis. This model of the residuals is used to quantify uncertainties of the CIB power spectrum in a companion Planck paper.

Abstract Copyright: ∼

Journal keyword(s): dust, extinction - submillimeter: ISM - local insterstellar matter - infrared: diffuse background - cosmic background radiation

Simbad objects: 5

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Number of rows : 5

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2024	#notes
1	NAME Magellanic Stream	HVC	00 32	-30.0			~	971	1
2	NAME SGP	reg	00 51 26.275	-27 07 41.70			~	567	0
3	NAME SMC	G	00 52 38.0	-72 48 01	2.79	2.2	~	11142	1
4	NAME LMC	G	05 23 34.6	-69 45 22		0.4	~	17424	0
5	NAME Gould Belt	PoG	~	~			~	873	1

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