Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy

Ray J. Weymann, Daniel Stern, Andrew Bunker, Hyron Spinrad, Frederic H. Chaffee, Rodger I Thompson, Lisa J. Storrie-Lombardi

Research output: Contribution to journalArticle

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Abstract

We present Keck Low Resolution Imaging Spectrometer spectroscopy along with Near-Infrared Camera and Multiobject Spectrometer (NICMOS) F110W (∼J) and F160W (∼H) images of the galaxy HDF 4-473.0 in the Hubble Deep Field (HDF), with a detection of an emission line consistent with Lyα at a redshift of z = 5.60. Attention to this object as a high-redshift galaxy was first drawn by Lanzetta, Yahil, & Fernandez-Soto and appeared in their initial list of galaxies with redshifts estimated from the Wide Field Planetary Camera 2 (WFPC2) HDF photometry. It was selected by us for spectroscopic observation, along with others in the HDF, on the basis of the NICMOS F110W and F160W and WFPC2 photometry. ForH0 = 65 km s-1 Mpc-1 and q0 = 0.125, the use of simple evolutionary models along with the F814W (∼I), F110W, and F160W magnitudes allow us to estimate the star formation rate (∼13 M yr-1). The colors suggest a reddening of E(B - V) ∼ 0.06. The measured flux in the Lyα line is approximately 1.0 × 10-17 ergs cm-2 s-1, and the rest-frame equivalent width, correcting for the absorption caused by intervening H I, is ∼90 Å. The galaxy is compact and regular, but resolved, with an observed FWHM of ∼0″.44. Simple evolutionary models can accurately reproduce the colors, and these models predict the Lyα flux to within a factor of 2. Using this object as a template shifted to higher redshifts, we calculate the magnitudes through the F814W and two NICMOS passbands for galaxies at redshifts 6 < z < 10.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume505
Issue number2 PART II
StatePublished - 1998

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photometry
spectrometer
spectroscopy
cameras
galaxies
near infrared
spectrometers
color
compact galaxies
erg
imaging spectrometers
star formation rate
lists
templates
estimates

Keywords

  • Early universe
  • Galaxies: distances and redshifts
  • Galaxies: evolution
  • Galaxies: formation

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Weymann, R. J., Stern, D., Bunker, A., Spinrad, H., Chaffee, F. H., Thompson, R. I., & Storrie-Lombardi, L. J. (1998). Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy. Astrophysical Journal, 505(2 PART II).

Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy. / Weymann, Ray J.; Stern, Daniel; Bunker, Andrew; Spinrad, Hyron; Chaffee, Frederic H.; Thompson, Rodger I; Storrie-Lombardi, Lisa J.

In: Astrophysical Journal, Vol. 505, No. 2 PART II, 1998.

Research output: Contribution to journalArticle

Weymann, RJ, Stern, D, Bunker, A, Spinrad, H, Chaffee, FH, Thompson, RI & Storrie-Lombardi, LJ 1998, 'Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy', Astrophysical Journal, vol. 505, no. 2 PART II.
Weymann RJ, Stern D, Bunker A, Spinrad H, Chaffee FH, Thompson RI et al. Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy. Astrophysical Journal. 1998;505(2 PART II).
Weymann, Ray J. ; Stern, Daniel ; Bunker, Andrew ; Spinrad, Hyron ; Chaffee, Frederic H. ; Thompson, Rodger I ; Storrie-Lombardi, Lisa J. / Keck spectroscopy and nicmos photometry of a redshift z = 5.60 galaxy. In: Astrophysical Journal. 1998 ; Vol. 505, No. 2 PART II.
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abstract = "We present Keck Low Resolution Imaging Spectrometer spectroscopy along with Near-Infrared Camera and Multiobject Spectrometer (NICMOS) F110W (∼J) and F160W (∼H) images of the galaxy HDF 4-473.0 in the Hubble Deep Field (HDF), with a detection of an emission line consistent with Lyα at a redshift of z = 5.60. Attention to this object as a high-redshift galaxy was first drawn by Lanzetta, Yahil, & Fernandez-Soto and appeared in their initial list of galaxies with redshifts estimated from the Wide Field Planetary Camera 2 (WFPC2) HDF photometry. It was selected by us for spectroscopic observation, along with others in the HDF, on the basis of the NICMOS F110W and F160W and WFPC2 photometry. ForH0 = 65 km s-1 Mpc-1 and q0 = 0.125, the use of simple evolutionary models along with the F814W (∼I), F110W, and F160W magnitudes allow us to estimate the star formation rate (∼13 M⊙ yr-1). The colors suggest a reddening of E(B - V) ∼ 0.06. The measured flux in the Lyα line is approximately 1.0 × 10-17 ergs cm-2 s-1, and the rest-frame equivalent width, correcting for the absorption caused by intervening H I, is ∼90 {\AA}. The galaxy is compact and regular, but resolved, with an observed FWHM of ∼0″.44. Simple evolutionary models can accurately reproduce the colors, and these models predict the Lyα flux to within a factor of 2. Using this object as a template shifted to higher redshifts, we calculate the magnitudes through the F814W and two NICMOS passbands for galaxies at redshifts 6 < z < 10.",
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AU - Thompson, Rodger I

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AB - We present Keck Low Resolution Imaging Spectrometer spectroscopy along with Near-Infrared Camera and Multiobject Spectrometer (NICMOS) F110W (∼J) and F160W (∼H) images of the galaxy HDF 4-473.0 in the Hubble Deep Field (HDF), with a detection of an emission line consistent with Lyα at a redshift of z = 5.60. Attention to this object as a high-redshift galaxy was first drawn by Lanzetta, Yahil, & Fernandez-Soto and appeared in their initial list of galaxies with redshifts estimated from the Wide Field Planetary Camera 2 (WFPC2) HDF photometry. It was selected by us for spectroscopic observation, along with others in the HDF, on the basis of the NICMOS F110W and F160W and WFPC2 photometry. ForH0 = 65 km s-1 Mpc-1 and q0 = 0.125, the use of simple evolutionary models along with the F814W (∼I), F110W, and F160W magnitudes allow us to estimate the star formation rate (∼13 M⊙ yr-1). The colors suggest a reddening of E(B - V) ∼ 0.06. The measured flux in the Lyα line is approximately 1.0 × 10-17 ergs cm-2 s-1, and the rest-frame equivalent width, correcting for the absorption caused by intervening H I, is ∼90 Å. The galaxy is compact and regular, but resolved, with an observed FWHM of ∼0″.44. Simple evolutionary models can accurately reproduce the colors, and these models predict the Lyα flux to within a factor of 2. Using this object as a template shifted to higher redshifts, we calculate the magnitudes through the F814W and two NICMOS passbands for galaxies at redshifts 6 < z < 10.

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KW - Galaxies: formation

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