2001A&A...375..805D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET06:23:28

2001A&A...375..805D - Astronomy and Astrophysics, volume 375, 805-813 (2001/9-1)

Constraints on the Lyman continuum radiation from galaxies: First results with FUSE on Mrk 54.

DEHARVENG J.-M., BUAT V., LE BRUN V., MILLIARD B., KUNTH D., SHULL J.M. and GRY C.

Abstract (from CDS):

We present Far Ultraviolet Spectroscopic Explorer observations of the star-forming galaxy Mrk 54 at z=0.0448. The Lyman continuum radiation is not detected above the HI absorption edge in our Galaxy. An upper limit is evaluated by comparison with the background measured in regions of the detector adjacent to the observed spectrum. A spectral window of 16Å, reasonably free of additional HI Lyman series line absorption, is used. No correction is needed for molecular hydrogen absorption in our Galaxy but a foreground extinction of 0.29mag is accounted for. An upper limit of 6.15x10–16erg/cm2/s/Å is obtained for the flux at ≃900Å in the rest frame of Mrk 54. By comparison with the number of ionizing photons derived from the Hα flux, this limit translates into an upper limit of fesc<0.062 for the fraction of Lyman continuum photons that escape the galaxy without being absorbed by interstellar material. This limit compares with the limits obtained in three other nearby galaxies and is compatible with the escape fractions predicted by models. The upper limits obtained in nearby galaxies contrasts with the detection of Lyman continuum flux in the composite spectrum of Lyman-break galaxies at z≃3.4. The difficulties and implications of a comparison are discussed.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Mrk 54 - intergalactic medium - galaxies: ISM - galaxies: starburst - ultraviolet: galaxies

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASX J08382309+6507160 SBG 08 38 23.093 +65 07 16.05     14.16     ~ 117 1
2 NGC 3067 GiG 09 58 21.057 +32 22 11.97   12.7       ~ 228 1
3 Mrk 1267 bCG 10 53 03.845 +04 37 54.24   14.1       ~ 71 0
4 Mrk 54 GiC 12 56 55.638 +32 26 51.50   15.1       ~ 78 0
5 Mrk 66 Sy2 13 25 53.813 +57 15 16.08   15.0       ~ 74 0
6 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 399 2
7 Mrk 876 Sy1 16 13 57.1791807197 +65 43 09.953889666   16.03 15.49     ~ 516 0
8 ESO 141-55 Sy1 19 21 14.1471805047 -58 40 12.981632705   14.36 13.64 13.28   ~ 322 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-06:23:28

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