2002A&A...384....1G

Query : 2002A&A...384....1G

2002A&A...384....1G - Astronomy and Astrophysics, volume 3841-10 (2002/3-2)

Measuring the properties of extragalactic dust and implications for the Hubble diagram.

GOOBAR A., BERGSTROEM L. and MOERTSELL E.

Abstract (from CDS):

Scattering and absorption of light by a homogeneous distribution of intergalactic large dust grains has been proposed as an alternative, non-cosmological explanation for the faintness of type Ia supernovae at z∼0.5. We investigate the differential extinction for high-redshift sources caused by extragalactic dust along the line of sight. Future observations of type Ia supernovae up to z∼2, e.g. by the proposed SNAP satellite, will allow the measurement of the properties of dust over cosmological distances. We show that 1% relative spectrophotometric accuracy (or broadband photometry) in the wavelength interval 0.7-1.5µm is required to measure the extinction caused by ``grey'' dust down to δm=0.02mag. We also argue that the presence of grey dust is not necessarily inconsistent with the recent measurement of the brightness of a supernova at z=1.7 (SN 1997ff), in the absence of accurate spectrophotometric information of the supernova.

Abstract Copyright: ∼

Journal keyword(s): cosmological parameters - dust, extinction - supernovae: general

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 SN 1997ff SN* 12 36 44.10 +62 12 44.7         26.77 SNIa 67 1

Query : 2002A&A...384....1G

Basic data :
SN 1997ff -- SuperNova
Other object types: otypes_help 		SN* (2012A&A,SN)
ICRS coord. (ep=J2000) : 		12 36 44.10 +62 12 44.7 [ ] D 2008yCat.2283....0B
FK4 coord. (ep=B1950 eq=1950) : 		12 34 30.08 +62 29 14.6 [ ]
Gal coord. (ep=J2000) : 		125.90627 +54.83084 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 229992 [~] / z(~) 1.755 [~] / cz 526136 [~]
   D 2004ApJ...602...12Z
Spectral type: 		SNIa C 2008yCat....1.2024B
Fluxes (1) :
I 26.77 [~] D 2008yCat.2283....0B
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Identifiers (1) :
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SN 1997ff

References (67 between 1850 and 2026) (Total 67)
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