Massive z ∼ 1.3 evolved galaxies revealed

P. Saracco; M. Longhetti; P. Severgnini; R. Della Ceca; F. Mannucci; R. Bender; N. Drory; G. Feulner; F. Ghinassi; U. Hopp; C. Maraston

doi:10.1051/0004-6361:20021696

Massive z ∼ 1.3 evolved galaxies revealed

P. Saracco, M. Longhetti, P. Severgnini, R. Della Ceca, F. Mannucci, R. Bender, N. Drory, G. Feulner, F. Ghinassi, U. Hopp, C. Maraston

Institute of Cosmology & Gravitation

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Abstract

We present the results of TNG near-IR low resolution spectroscopy of two (S7F5_254 and S7F5_45) sources belonging to a complete sample of 15 EROs with K < 18 and R − K > 5 selected from the MUNICS Survey. Both the spectra show a sharp drop in the continuum which can be ascribed only to the Balmer break. This places them at 1.2 < z < 1.5. Their rest-frame z = 1.2 K-band absolute magnitude is M_K≃−26.6 (L ∼ 7L∗). The comparison of the spectra and the photometric data with a grid of synthetic template spectra provides a redshift z 1.22^−0.07 _+0.2 for S7F5_254 and z ≃ 1.46 ± 0.02 for S7F5_45. The resulting lower limits to their stellar mass are M^min _stars = 6 × 10¹¹ M_⊙ and M^min r_stars = 4 × 10¹¹ M_⊙. The minimum age of the last burst of star formation in S7F5_254 is 3.5 Gyr while it is 0.5 Gyr in S7F5_45 implying a minimum formation redshift z_f≳ 3.5 and z_f ≳ 2 for the two EROs respectively.

Original language	English
Pages (from-to)	127-132
Journal	Astronomy and Astrophysics
Volume	398
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361:20021696
Publication status	Published - 4 Jan 2003

Keywords

galaxies : evolution
galaxies : elliptical and lenticular, cD
galaxies : formation

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@article{3572812fe823485184dd95529ef9ac91,

title = "Massive z ∼ 1.3 evolved galaxies revealed",

abstract = "We present the results of TNG near-IR low resolution spectroscopy of two (S7F5_254 and S7F5_45) sources belonging to a complete sample of 15 EROs with K < 18 and R − K > 5 selected from the MUNICS Survey. Both the spectra show a sharp drop in the continuum which can be ascribed only to the Balmer break. This places them at 1.2 < z < 1.5. Their rest-frame z = 1.2 K-band absolute magnitude is MK ≃−26.6 (L ∼ 7L∗). The comparison of the spectra and the photometric data with a grid of synthetic template spectra provides a redshift z 1.22−0.07 +0.2 for S7F5_254 and z ≃ 1.46 ± 0.02 for S7F5_45. The resulting lower limits to their stellar mass are Mmin stars = 6 × 1011 M⊙ and Mmin rstars = 4 × 1011 M⊙. The minimum age of the last burst of star formation in S7F5_254 is 3.5 Gyr while it is 0.5 Gyr in S7F5_45 implying a minimum formation redshift zf ≳ 3.5 and zf ≳ 2 for the two EROs respectively.",

keywords = "galaxies : evolution, galaxies : elliptical and lenticular, cD, galaxies : formation",

author = "P. Saracco and M. Longhetti and P. Severgnini and {Della Ceca}, R. and F. Mannucci and R. Bender and N. Drory and G. Feulner and F. Ghinassi and U. Hopp and C. Maraston",

year = "2003",

month = jan,

day = "4",

doi = "10.1051/0004-6361:20021696",

language = "English",

volume = "398",

pages = "127--132",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "1",

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TY - JOUR

T1 - Massive z ∼ 1.3 evolved galaxies revealed

AU - Saracco, P.

AU - Longhetti, M.

AU - Severgnini, P.

AU - Della Ceca, R.

AU - Mannucci, F.

AU - Bender, R.

AU - Drory, N.

AU - Feulner, G.

AU - Ghinassi, F.

AU - Hopp, U.

AU - Maraston, C.

PY - 2003/1/4

Y1 - 2003/1/4

N2 - We present the results of TNG near-IR low resolution spectroscopy of two (S7F5_254 and S7F5_45) sources belonging to a complete sample of 15 EROs with K < 18 and R − K > 5 selected from the MUNICS Survey. Both the spectra show a sharp drop in the continuum which can be ascribed only to the Balmer break. This places them at 1.2 < z < 1.5. Their rest-frame z = 1.2 K-band absolute magnitude is MK ≃−26.6 (L ∼ 7L∗). The comparison of the spectra and the photometric data with a grid of synthetic template spectra provides a redshift z 1.22−0.07 +0.2 for S7F5_254 and z ≃ 1.46 ± 0.02 for S7F5_45. The resulting lower limits to their stellar mass are Mmin stars = 6 × 1011 M⊙ and Mmin rstars = 4 × 1011 M⊙. The minimum age of the last burst of star formation in S7F5_254 is 3.5 Gyr while it is 0.5 Gyr in S7F5_45 implying a minimum formation redshift zf ≳ 3.5 and zf ≳ 2 for the two EROs respectively.

AB - We present the results of TNG near-IR low resolution spectroscopy of two (S7F5_254 and S7F5_45) sources belonging to a complete sample of 15 EROs with K < 18 and R − K > 5 selected from the MUNICS Survey. Both the spectra show a sharp drop in the continuum which can be ascribed only to the Balmer break. This places them at 1.2 < z < 1.5. Their rest-frame z = 1.2 K-band absolute magnitude is MK ≃−26.6 (L ∼ 7L∗). The comparison of the spectra and the photometric data with a grid of synthetic template spectra provides a redshift z 1.22−0.07 +0.2 for S7F5_254 and z ≃ 1.46 ± 0.02 for S7F5_45. The resulting lower limits to their stellar mass are Mmin stars = 6 × 1011 M⊙ and Mmin rstars = 4 × 1011 M⊙. The minimum age of the last burst of star formation in S7F5_254 is 3.5 Gyr while it is 0.5 Gyr in S7F5_45 implying a minimum formation redshift zf ≳ 3.5 and zf ≳ 2 for the two EROs respectively.

KW - galaxies : evolution

KW - galaxies : elliptical and lenticular, cD

KW - galaxies : formation

U2 - 10.1051/0004-6361:20021696

DO - 10.1051/0004-6361:20021696

M3 - Article

SN - 0004-6361

VL - 398

SP - 127

EP - 132

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

Massive z ∼ 1.3 evolved galaxies revealed

Abstract

Keywords

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