Spectroscopic Properties of the z = 4.5 Lyα --emitters

Details Spectroscopic Properties of the z = 4.5 Lyα --emitters Spectroscopic Properties of the z = 4.5 Lyα --emitters

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.4804d&link_type=abstract

American Astronomical Society Meeting 204, #48.04; Bulletin of the American Astronomical Society, Vol. 36, p.746

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Keck/LRIS and Keck/DEIMOS optical spectra of ˜ 50 star--forming galaxies at z ≈ 4.5 discovered in the Large Area Lyman Alpha (LALA) survey. The survey has identified a sample of ˜ 350 candidate Lyα --emitting galaxies at z ≈ 4.5 in a search volume of 1.5 × 106 comoving Mpc3; the spectroscopic confirmations presented herein suggest a selection reliability of ˜ 80%. The large equivalent widths (median Wλ rest} ≈ 80 Å) but narrow physical widths (Δ v < 500 km s-1) of the Lyα emission lines, along with the lack of accompanying high--ionization state emission lines, suggests that these galaxies are young systems powered by star formation rather than by AGN activity. Theoretical models of galaxy formation in the primordial Universe suggest that a small fraction of Lyα --emitting galaxies at z ≈ 4.5 may still be nascent, metal--free objects. Indeed, we find with 96% confidence that at least ˜ 20% of the confirmed sources show Wλ rest} > 240 Å, exceeding the maximum Lyα equivalent width predicted for normal stellar populations. Nonetheless, we find no evidence for \ion{He}{2} λ 1640 emission in either individual or composite spectra, indicating that though these galaxies are young, they are not truly primitive, Population III objects.

Affiliated with

Also associated with

No associations

Rating

Spectroscopic Properties of the z = 4.5 Lyα --emitters 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 Spectroscopic Properties of the z = 4.5 Lyα --emitters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopic Properties of the z = 4.5 Lyα --emitters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1173879