BibSonomy :: publication :: Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark Matter Distributions Determine the Lyman Alpha Spatial Extents?

Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark Matter Distributions Determine the Lyman Alpha Spatial Extents?

Y. Matsuda, T. Yamada, T. Hayashino, R. Yamauchi, Y. Nakamura, N. Morimoto, M. Ouchi, Y. Ono, M. Umemura, and M. Mori. (2012)cite arxiv:1204.4934Comment: 7 pages, 4 figures, accepted for publication in MNRAS.

@misc{matsuda2012diffuse,
  abstract = {Using stacks of Ly-a images of 2128 Ly-a emitters (LAEs) and 24 protocluster
UV-selected galaxies (LBGs) at z=3.1, we examine the surface brightness
profiles of Ly-a haloes around high-z galaxies as a function of environment and
UV luminosity. We find that the slopes of the Ly-a radial profiles become
flatter as the Mpc-scale LAE surface densities increase, but they are almost
independent of the central UV luminosities. The characteristic exponential
scale lengths of the Ly-a haloes appear to be proportional to the square of the
LAE surface densities (r(Lya) \propto Sigma(LAE)^2). Including the diffuse,
extended Ly-a haloes, the rest-frame Ly-a equivalent width of the LAEs in the
densest regions approaches EW_0(Lya) ~ 200 A, the maximum value expected for
young (< 10^7 yr) galaxies. This suggests that Ly-a photons formed via shock
compression by gas outflows or cooling radiation by gravitational gas inflows
may partly contribute to illuminate the Ly-a haloes; however, most of their
Ly-a luminosity can be explained by photo-ionisation by ionising photons or
scattering of Ly-a photons produced in HII regions in and around the central
galaxies. Regardless of the source of Ly-a photons, if the Ly-a haloes trace
the overall gaseous structure following the dark matter distributions, it is
not surprising that the Ly-a spatial extents depend more strongly on the
surrounding Mpc-scale environment than on the activities of the central
galaxies.},
  added-at = {2012-04-24T04:50:45.000+0200},
  author = {Matsuda, Y. and Yamada, T. and Hayashino, T. and Yamauchi, R. and Nakamura, Y. and Morimoto, N. and Ouchi, M. and Ono, Y. and Umemura, M. and Mori, M.},
  biburl = {http://www.bibsonomy.org/bibtex/2c43c2f443ff4c172a36d44057449927a/miki},
  description = {[1204.4934] Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark Matter Distributions Determine the Lyman Alpha Spatial Extents?},
  interhash = {386e58240dc27dc362671761fdb751a3},
  intrahash = {c43c2f443ff4c172a36d44057449927a},
  keywords = {blobs darkmatter diffuse halo lyalpha},
  note = {cite arxiv:1204.4934Comment: 7 pages, 4 figures, accepted for publication in MNRAS},
  timestamp = {2012-04-24T04:50:45.000+0200},
  title = {Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark
  Matter Distributions Determine the Lyman Alpha Spatial Extents?},
  url = {http://arxiv.org/abs/1204.4934},
  year = 2012
}

%0 Generic
%1 matsuda2012diffuse
%A Matsuda, Y.
%A Yamada, T.
%A Hayashino, T.
%A Yamauchi, R.
%A Nakamura, Y.
%A Morimoto, N.
%A Ouchi, M.
%A Ono, Y.
%A Umemura, M.
%A Mori, M.
%D 2012
%K 
%T Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark
  Matter Distributions Determine the Lyman Alpha Spatial Extents?
%U http://arxiv.org/abs/1204.4934
%X Using stacks of Ly-a images of 2128 Ly-a emitters (LAEs) and 24 protocluster
UV-selected galaxies (LBGs) at z=3.1, we examine the surface brightness
profiles of Ly-a haloes around high-z galaxies as a function of environment and
UV luminosity. We find that the slopes of the Ly-a radial profiles become
flatter as the Mpc-scale LAE surface densities increase, but they are almost
independent of the central UV luminosities. The characteristic exponential
scale lengths of the Ly-a haloes appear to be proportional to the square of the
LAE surface densities (r(Lya) \propto Sigma(LAE)^2). Including the diffuse,
extended Ly-a haloes, the rest-frame Ly-a equivalent width of the LAEs in the
densest regions approaches EW_0(Lya) ~ 200 A, the maximum value expected for
young (< 10^7 yr) galaxies. This suggests that Ly-a photons formed via shock
compression by gas outflows or cooling radiation by gravitational gas inflows
may partly contribute to illuminate the Ly-a haloes; however, most of their
Ly-a luminosity can be explained by photo-ionisation by ionising photons or
scattering of Ly-a photons produced in HII regions in and around the central
galaxies. Regardless of the source of Ly-a photons, if the Ly-a haloes trace
the overall gaseous structure following the dark matter distributions, it is
not surprising that the Ly-a spatial extents depend more strongly on the
surrounding Mpc-scale environment than on the activities of the central
galaxies.

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URL:	http://arxiv.org/abs/1204.4934
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BibTeX key:	matsuda2012diffuse

abstract

Using stacks of Ly-a images of 2128 Ly-a emitters LAEs and 24 protocluster UV-selected galaxies LBGs at z=3.1, we examine the surface brightness profiles of Ly-a haloes around high-z galaxies as a function of environment and UV luminosity. We find that the slopes of the Ly-a radial profiles become flatter as the Mpc-scale LAE surface densities increase, but they are almost independent of the central UV luminosities. The characteristic exponential scale lengths of the Ly-a haloes appear to be proportional to the square of the LAE surface densities rLya \propto SigmaLAE^2. Including the diffuse, extended Ly-a haloes, the rest-frame Ly-a equivalent width of the LAEs in the densest regions approaches EW_0Lya ~ 200 A, the maximum value expected for young < 10^7 yr galaxies. This suggests that Ly-a photons formed via shock compression by gas outflows or cooling radiation by gravitational gas inflows may partly contribute to illuminate the Ly-a haloes; however, most of their Ly-a luminosity can be explained by photo-ionisation by ionising photons or scattering of Ly-a photons produced in HII regions in and around the central galaxies. Regardless of the source of Ly-a photons, if the Ly-a haloes trace the overall gaseous structure following the dark matter distributions, it is not surprising that the Ly-a spatial extents depend more strongly on the surrounding Mpc-scale environment than on the activities of the central galaxies.

Description

[1204.4934] Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark Matter Distributions Determine the Lyman Alpha Spatial Extents?

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Diffuse Lyman Alpha Haloes around Lyman Alpha Emitters at z=3: Do Dark Matter Distributions Determine the Lyman Alpha Spatial Extents?

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resources (URL, PDF, ...)

abstract

Description