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29 March 2024 |
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Article overview
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Rest-Frame Ultraviolet to Near Infrared Observations of an Interacting Lyman Break Galaxy at z = 4.42 | Joshua D. Younger
; Jia-Sheng Huang
; Giovanni G. Fazio
; Thomas J. Cox
; Kamson Lai
; Philip F. Hopkins
; Lars Hernquist
; Casey J. Papovich
; Luc Simard
; Lihwai Lin
; Yi-Wen Cheng
; Haojin Yan
; Dusan Keres
; Alice E. Shapley
; | Date: |
7 Aug 2007 | Abstract: | We present the rest-frame ultraviolet through near infrared spectral energy
distribution for an interacting Lyman break galaxy at a redshift z=4.42, the
highest redshift merging system known with clearly resolved tidal features. The
two objects in this system - HDF-G4 and its previously unidentified companion -
are both B_{435} band dropouts, have similar V_{606}-i_{775} and
i_{775}-z_{850} colors, and are separated by 1", which at z=4.42 corresponds to
7 kpc projected nuclear separation; all indicative of an interacting system.
Fits to stellar population models indicate a stellar mass of M_star =
2.6 imes 10^{10} M_odot, age of au_star = 720 My, and exponential star
formation history with an e-folding time au_0 = 440 My. Using these derived
stellar populations as constraints, we model the HDF-G4 system using
hydrodynamical simulations, and find that it will likely evolve into a quasar
by zsim3.5, and a quiescent, compact spheroid by zsim 2.5 similar to those
observed at z > 2. And, the existence of such an object supports galaxy
formation models in which major mergers drive the high redshift buildup of
spheroids and black holes. | Source: | arXiv, 0708.0835 | Services: | Forum | Review | PDF | Favorites |
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