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

Details Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54 Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54

2001-06-18

arxiv.org/abs/astro-ph/0106306v1

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, accepted for publication in A&A include aa.cls v5.01

Scientific paper

10.1051/0004-6361:20010920

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 16 A, 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 0.29 mag is accounted for. An upper limit of 6.15 10^{-16} erg/cm^2/s/A is obtained for the flux at ~ 900 A in the rest frame of Mrk 54. By comparison with the number of ionizing photons derived from the H-alpha flux, this limit translates into an upper limit of f_esc < 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.

Affiliated with

Also associated with

No associations

Rating

Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on the Lyman continuum radiation from galaxies: first results with FUSE on Mrk 54 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-239680