VIMOS-VLT and Spitzer observations of a radio galaxy at z=2.5

M. Villar-Martin; S. F. Sanchez; C. De Breuck; R. Peletier; J. Vernet; A. Rettura; N. Seymour; A. Humphrey; D. Stern; S. di Serego Alighieri; R. Fosbury

doi:10.1111/j.1745-3933.2005.00118.x

arXiv · astro-ph/0510733

VIMOS-VLT and Spitzer observations of a radio galaxy at z=2.5

M. Villar-Martin·S. F. Sanchez·C. De Breuck·R. Peletier·J. Vernet·A. Rettura·N. Seymour·A. Humphrey·D. Stern·S. di Serego Alighieri·R. Fosbury

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Abstract

We present: 1) a kinematic and morphological study of the giant Lya nebula associated with the radio galaxy MRC2104-242 (z = 2.49) based on integral field spectroscopic VIMOS data from VLT; 2) a photometric study of the host (proto?) galaxy based on Spitzer Space Telescope data. The galaxy appears to be embedded in a giant (>120 kpc) gas reservoir that surrounds it completely. The kinematic properties of the nebula suggest that it is a rotating structure, which would imply a lower limit to the dynamical mass of ~3 x 1e11 Msun. An alternate scenario is that the gas is infalling. Such a process would be able to initiate and sustain significant central starburst activity, although it is likely to contribute with less than 10% of the total stellar mass of the galaxy. The near- to mid-IR spectral energy distribution of the radio galaxy suggests the existence of a reddened, E(B-V)=0.4(+/-)0 .1$, evolved stellar population of age >~ 1.8 Gyr and mass 5(+/-)2 x 1e11 Msun. The implied formation redshift is z_f >~ 6. This stellar mass is similar to the stellar masses found for massive early-type galaxies at z~2 in deep, near-infrared surveys.

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M. Villar-Martin, S. F. Sanchez, C. De Breuck, R. Peletier, J. Vernet, A. Rettura, N. Seymour, A. Humphrey, D. Stern, S. di Serego Alighieri, R. Fosbury. 2005-10-26. VIMOS-VLT and Spitzer observations of a radio galaxy at z=2.5. https://doi.org/10.1111/j.1745-3933.2005.00118.x

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