3D-HST: A wide-field grism spectroscopic survey with the Hubble Space Telescope

Дата и время публикации : 2012-04-12T20:00:05Z

Авторы публикации и институты :
Gabriel Brammer
Pieter van Dokkum
Marijn Franx
Mattia Fumagalli
Shannon Patel
Hans-Walter Rix
Rosalind Skelton
Mariska Kriek
Erica Nelson
Kasper Schmidt
Rachel Bezanson
Elisabete da Cunha
Dawn Erb
Xiaohui Fan
Natascha Förster Schreiber
Garth Illingworth
Ivo Labbé
Joel Leja
Britt Lundgren
Dan Magee
Danilo Marchesini
Patrick McCarthy
Ivelina Momcheva
Adam Muzzin
Ryan Quadri
Charles Steidel
Tomer Tal
David Wake
Katherine Whitaker
Anna Williams

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Replacement reflects version now accepted by ApJS. A preliminary data release intended to provide a general illustration of the WFC3 grism data is available at http://3dhst.research.yale.edu/
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: We present 3D-HST, a near-infrared spectroscopic Treasury program with the Hubble Space Telescope for studying the processes that shape galaxies in the distant Universe. 3D-HST provides rest-frame optical spectra for a sample of ~7000 galaxies at 1<z<3.5, the epoch when 60% of all star formation took place, the number density of quasars peaked, the first galaxies stopped forming stars, and the structural regularity that we see in galaxies today must have emerged. 3D-HST will cover 3/4 (625 sq.arcmin) of the CANDELS survey area with two orbits of primary WFC3/G141 grism coverage and two to four parallel orbits with the ACS/G800L grism. In the IR these exposure times yield a continuum signal-to-noise of ~5 per resolution element at H~23.1 and a 5sigma emission line sensitivity of 5×10-17 erg/s/cm2 for typical objects, improving by a factor of ~2 for compact sources in images with low sky background levels. The WFC3/G141 spectra provide continuous wavelength coverage from 1.1-1.6 um at a spatial resolution of ~0."13, which, combined with their depth, makes them a unique resource for studying galaxy evolution. We present the preliminary reduction and analysis of the grism observations, including emission line and redshift measurements from combined fits to the extracted grism spectra and photometry from ancillary multi-wavelength catalogs. The present analysis yields redshift estimates with a precision of sigma(z)=0.0034(1+z), or sigma(v)~1000 km/s. We illustrate how the generalized nature of the survey yields near-infrared spectra of remarkable quality for many different types of objects, including a quasar at z=4.7, quiescent galaxies at z~2, and the most distant T-type brown dwarf star known. The CANDELS and 3D-HST surveys combined will provide the definitive imaging and spectroscopic dataset for studies of the 1<z<3.5 Universe until the launch of the James Webb Space Telescope.

Category: Physics