1998/09/30 by Ana Campos, A. Yahil, Amos Yahil +8
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Cosmic microwave background #Galaxies: Formation, Evolution, Phenomena #Galaxy #Optics #Physics #Protein filament #QSOS #Redshift #Rest frame #Velocity dispersion #astro-ph
paper · pdf · doi:10.1086/311824
Submitted to Astrophysical Journal Letters February 17, 1998; Accepted November 19, 1998. The new version includes minor changes following referee comments. 10 LaTeX pages and Figures 2-4. Figure 1 (1.7 MB) is available at ftp://sbast4.ess.sunysb.edu/pub/ayahil/papers/sz_cluster_fig1.ps.gz The entire paper in ApJ emulating format (1.9 MB) is available at ftp://sbast4.ess.sunysb.edu/pub/ayahil/papers/sz_cluster_apj.ps.gz
arxiv created 1998/11/20 · openalex publication_date 1999/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the discovery of 56 new Lyα-emitting candidates (LECs) at redshift z ≈ 2.5 in a field of 8' × 14' around two previously known weak radio QSOs and a cosmic microwave background decrement (CMBD) that is plausibly due to the Sunyaev-Zeldovich effect. Broadband and medium-band imaging at the redshifted Lyα wavelength have allowed us to identify the LECs at the redshift of the QSOs. Three of the brightest LECs have been confirmed spectroscopically, with redshifts between z = 2.501 and z = 2.557; one of them is another QSO. Excluding the third QSO, the four spectroscopically confirmed objects form a 3' filament with a rest-frame velocity dispersion of 1000 km s -1 lying adjacent to the CMBD, and there is a significant concentration of LECs at the northwest end of the filament around the brightest QSO. If confirmed, a velocity dispersion ~1000 km s -1 on a proper scale of ~1 Mpc at redshift z = 2.5 would, in and of itself, constrain the cosmological model to low Ω.