The Overdense Environment of a Large Lyα Nebula at z ≈ 2.7
نویسندگان
چکیده
منابع مشابه
THE OVERDENSE ENVIRONMENT OF A LARGE Lyα NEBULA AT z≈2.7
Large nebulae (&50 kpc) emitting strongly in Lyα (also known as Lyα “blobs”) are likely signposts of ongoing massive galaxy formation. The relative rarity of these sources and their discovery in wellstudied galaxy overdensities suggest that they may be associated with regions of high galaxy density. One of the largest Lyα nebulae, discovered at a redshift of z ≈ 2.7 via its strong mid-infrared ...
متن کاملTHE DISCOVERY OF A LARGE Lyα+He II NEBULA AT z ≈ 1.67: A CANDIDATE LOW METALLICITY REGION?
We have discovered a ≈45 kpc Lyα nebula (or Lyα “blob”) at z ≈ 1.67 which exhibits strong, spatially-extended He ii emission and very weak C iv and C iii] emission. This is the first spatiallyextended Lyα+He ii emitter observed and the lowest redshift Lyα blob yet found. Strong Lyα and He iiλ1640 emission in the absence of metal lines has been proposed as a unique observational signature of pri...
متن کاملA study of distant Lyα emitters in overdense regions
Recently, we conducted a Very Large Telescope (VLT) large program to search for forming clusters by looking for overdensities of Lyα emitters around high redshift radio galaxies. In total seven proto-clusters were discovered, including a protocluster around the radio galaxy MRC 0316–257 at z ∼ 3.13. This structure has an excess of Lyα emitters by a factor of 3 as compared to the field, and the ...
متن کاملLyα Absorption from an Overdense Region in the Intergalactic Medium
We report the first detection of an O VIII Lyα absorption line associated with an overdense region in the intergalactic medium (IGM) along the sightline towards PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETGS). The absorption line is detected at 4.5σ level with cz ≈ 16, 600 km s. At the same velocity Shull et al. (1998) detected a small group of spiral galaxies...
متن کاملThe NATURE OF DAMPED Lyα ABSORBING GALAXIES AT z ≤ 1–A PHOTOMETRIC REDSHIFT SURVEY OF DAMPED Lyα ABSORBERS
We study the nature of damped Lyα absorption (DLA) systems at z ≤ 1 using a sample of 11 DLA galaxies, for which accurate redshift measurements are available. Five of the 11 systems are identified in our on-going photometric redshift survey of DLA galaxies, while the remaining six systems are identified by previous groups using either spectroscopic or photometric redshift techniques. Absolute B...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/588606