2008ApJ...678L..77P


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST23:28:56

2008ApJ...678L..77P - Astrophys. J., 678, L77-L80 (2008/May-2)

The overdense environment of a large Lyα nebula at z ~ 2.7.

PRESCOTT M.K.M., KASHIKAWA N., DEY A. and MATSUDA Y.

Abstract (from CDS):

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 well-studied 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 emission, provides an unbiased test of this association. We have carried out a deep intermediate-band imaging survey for Lyα-emitting galaxies (LAEs) within a 30'x26' field of view around this Lyα nebula. This is the first study of the environment of a Lyα nebula found without a priori knowledge of its surroundings. We find that the nebula is located in an overdense region, at least 20x50 h–170 comoving Mpc in size, showing a factor of ∼3 LAE number density enhancement relative to the edge of the field. Given the predicted number of such overdensities, we rule out the possibility of a chance coincidence at the ≲1% level. This study, in conjunction with previous work, provides strong confirmation of the association between the largest Lyα nebulae and overdense regions of the universe.

Abstract Copyright:

Journal keyword(s): Galaxies: Formation - Galaxies: High-Redshift - Cosmology: Large-Scale Structure of Universe

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 620 0
2 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 330 0
3 BD+25 4655 HS* 21 59 41.9751489837 +26 25 57.398356446 8.27 9.39 9.68     sdO6 104 0
4 SSA 22 reg 22 17 34.7 +00 15 07           ~ 280 0

    Equat.    Gal    SGal    Ecl

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