2002A&A...394..807V


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST08:30:13

2002A&A...394..807V - Astronomy and Astrophysics, volume 394, 807-822 (2002/11-2)

An inverse method to recover the SFR and reddening properties from spectra of galaxies.

VERGELY J.-L., LANCON A. and MOUHCINE M.

Abstract (from CDS):

We develop a non-parametric inverse method to investigate the star formation rate, the metallicity evolution and the reddening properties of galaxies based on their spectral energy distributions (SEDs). This approach allows us to clarify the level of information present in the data, depending on its signal-to-noise ratio. When low resolution SEDs are available in the ultraviolet, optical and near-IR wavelength ranges together, we conclude that it is possible to constrain the star formation rate and the effective dust optical depth simultaneously with a signal-to-noise ratio of 25. With excellent signal-to-noise ratios, the age-metallicity relation can also be constrained. We apply this method to the well-known nuclear starburst in the interacting galaxy NGC 7714. We focus on deriving the star formation history and the reddening law. We confirm that classical extinction models cannot provide an acceptable simultaneous fit of the SED and the lines. We also confirm that, with the adopted population synthesis models and in addition to the current starburst, an episode of enhanced star formation that started more than 200 Myr ago is required. As the time elapsed since the last interaction with NGC 7715, based on dynamical studies, is about 100 Myr, our result reinforces the suggestion that this interaction might not have been the most important event in the life of NGC 7714.

Abstract Copyright:

Journal keyword(s): methods: statistical - stars: formation - ISM: dust, extinction - galaxies: individual: NGC 7714 - galaxies: stellar content

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 7714 GiP 23 36 14.099 +02 09 18.07   14.91 14.36     ~ 739 1
2 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 605 0
3 NGC 7715 GiP 23 36 21.768 +02 09 25.30   11.81 12.14     ~ 130 0

    Equat.    Gal    SGal    Ecl

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2021.04.21-08:30:13

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