2000MNRAS.311..629M

Query : 2000MNRAS.311..629M

2000MNRAS.311..629M - Mon. Not. R. Astron. Soc., 311, 629-635 (2000/January-3)

HII galaxies as deep cosmological probes.

MELNICK J., TERLEVICH R. and TERLEVICH E.

Abstract (from CDS):

We re-investigated the use of the Hubble diagram to measure the cosmological constant (Λ) and the mass density of the Universe (ΩM). We find an important focusing effect in Λ for redshifts of about 3. This effect implies that the apparent magnitude of a standard candle at redshifts z=2-3 has almost no dependence on Λ for ΩM>0.2. This means that ΩM can be measured independently of ΩΛ by targeting the redshift range according to an estimate of the value of ΩM.

We explore the evidence in support of the suggestion that extreme starburst galaxies, also known as Hii galaxies, can be used as distance estimators over a wide range of redshifts and reaching very high values. We have compiled literature data of Hii galaxies up to z∼3 and found a good correlation between their luminosity and velocity dispersion measured from their strong emission lines, thus confirming the correlation already known to exist for Hii galaxies in the nearby Universe. Several systematic effects, such as age, extinction, kinematics and metallicity, are discussed, as well as the effects of different cosmologies.


Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): Hii regions - galaxies: fundamental parameters - galaxies: ISM - galaxies: irregular - cosmology: miscellaneous - distance scale

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 [K80] Herc-1 3618 G 17 19 07.96 +49 43 23.3           ~ 5 0

Query : 2000MNRAS.311..629M

Basic data :
[K80] Herc-1 3618 -- Galaxy
Other object types: otypes_help 		G ([K80])
ICRS coord. (ep=J2000) : 		17 19 07.96 +49 43 23.3 [ 1000 1000 90 ] D 1994ApJ...427L...9K
FK4 coord. (ep=B1950 eq=1950) : 		17 17 51.80 +49 46 23.7 [ 1000 1000 90 ]
Gal coord. (ep=J2000) : 		076.38403 +34.98767 [ 1000 1000 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 36981 [~] / z(~) 0.132000 [~] / cz 39572.60 [~]
   D 1994ApJ...427L...9K
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Identifiers (1) :
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[K80] Herc-1 3618

References (5 between 1850 and 2026) (Total 5)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Data at NED - NASA/IPAC Extragalactic Database : [K80] Herc-1 3618

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