University of Hertfordshire

From the same journal

From the same journal

By the same authors

Standard

Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3 : Perspectives on recent star formation. / Rutkowski, Michael J.; Jeong, Hyunjin; Cohen, Seth H.; Kaviraj, S.; Windhorst, Rogier A.; Ryan, Russell E.; Koekemoer, Anton; Yi, Sukyoung K.; Hathi, Nimish P.; Dopita, Michael A.

In: The Astrophysical Journal, Vol. 796, No. 2, 101, 01.12.2014.

Research output: Contribution to journalArticle

Harvard

Rutkowski, MJ, Jeong, H, Cohen, SH, Kaviraj, S, Windhorst, RA, Ryan, RE, Koekemoer, A, Yi, SK, Hathi, NP & Dopita, MA 2014, 'Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3: Perspectives on recent star formation', The Astrophysical Journal, vol. 796, no. 2, 101. https://doi.org/10.1088/0004-637X/796/2/101

APA

Vancouver

Author

Rutkowski, Michael J. ; Jeong, Hyunjin ; Cohen, Seth H. ; Kaviraj, S. ; Windhorst, Rogier A. ; Ryan, Russell E. ; Koekemoer, Anton ; Yi, Sukyoung K. ; Hathi, Nimish P. ; Dopita, Michael A. / Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3 : Perspectives on recent star formation. In: The Astrophysical Journal. 2014 ; Vol. 796, No. 2.

Bibtex

@article{c157993e6bf64ce787988b1023bc22c6,
title = "Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3: Perspectives on recent star formation",
abstract = "We present an analysis of the stellar populations of 102 visually selected early-type galaxies (ETGs) with spectroscopic redshifts (0.35 ≲ z ≲ 1.5) from observations in the Early Release Science program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). We fit one- and two-component synthetic stellar models to the ETGs UV-optical-near-IR spectral energy distributions and find that a large fraction (∼40{\%}) are likely to have experienced a minor (fYC ≲ 10{\%} of stellar mass) burst of recent (tYC ≲ 1 Gyr) star formation. The measured age and mass fraction of the young stellar populations do not strongly trend with measurements of galaxy morphology. We note that massive (M > 1010.5 M ) recent star-forming ETGs appear to have larger sizes. Furthermore, high-mass, quiescent ETGs identified with likely companions populate a distinct region in the size-mass parameter space, in comparison with the distribution of massive ETGs with evidence of recent star formation (RSF). We conclude that both mechanisms of quenching star formation in disk-like ETGs and (gas-rich, minor) merger activity contribute to the formation of young stars and the size-mass evolution of intermediate redshift ETGs. The number of ETGs for which we have both HST WFC3 panchromatic (especially UV) imaging and spectroscopically confirmed redshifts is relatively small, therefore, a conclusion about the relative roles of both of these mechanisms remains an open question.",
keywords = "galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: star formation, ultraviolet: galaxies",
author = "Rutkowski, {Michael J.} and Hyunjin Jeong and Cohen, {Seth H.} and S. Kaviraj and Windhorst, {Rogier A.} and Ryan, {Russell E.} and Anton Koekemoer and Yi, {Sukyoung K.} and Hathi, {Nimish P.} and Dopita, {Michael A.}",
year = "2014",
month = "12",
day = "1",
doi = "10.1088/0004-637X/796/2/101",
language = "English",
volume = "796",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

RIS

TY - JOUR

T1 - Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3

T2 - Perspectives on recent star formation

AU - Rutkowski, Michael J.

AU - Jeong, Hyunjin

AU - Cohen, Seth H.

AU - Kaviraj, S.

AU - Windhorst, Rogier A.

AU - Ryan, Russell E.

AU - Koekemoer, Anton

AU - Yi, Sukyoung K.

AU - Hathi, Nimish P.

AU - Dopita, Michael A.

PY - 2014/12/1

Y1 - 2014/12/1

N2 - We present an analysis of the stellar populations of 102 visually selected early-type galaxies (ETGs) with spectroscopic redshifts (0.35 ≲ z ≲ 1.5) from observations in the Early Release Science program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). We fit one- and two-component synthetic stellar models to the ETGs UV-optical-near-IR spectral energy distributions and find that a large fraction (∼40%) are likely to have experienced a minor (fYC ≲ 10% of stellar mass) burst of recent (tYC ≲ 1 Gyr) star formation. The measured age and mass fraction of the young stellar populations do not strongly trend with measurements of galaxy morphology. We note that massive (M > 1010.5 M ) recent star-forming ETGs appear to have larger sizes. Furthermore, high-mass, quiescent ETGs identified with likely companions populate a distinct region in the size-mass parameter space, in comparison with the distribution of massive ETGs with evidence of recent star formation (RSF). We conclude that both mechanisms of quenching star formation in disk-like ETGs and (gas-rich, minor) merger activity contribute to the formation of young stars and the size-mass evolution of intermediate redshift ETGs. The number of ETGs for which we have both HST WFC3 panchromatic (especially UV) imaging and spectroscopically confirmed redshifts is relatively small, therefore, a conclusion about the relative roles of both of these mechanisms remains an open question.

AB - We present an analysis of the stellar populations of 102 visually selected early-type galaxies (ETGs) with spectroscopic redshifts (0.35 ≲ z ≲ 1.5) from observations in the Early Release Science program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). We fit one- and two-component synthetic stellar models to the ETGs UV-optical-near-IR spectral energy distributions and find that a large fraction (∼40%) are likely to have experienced a minor (fYC ≲ 10% of stellar mass) burst of recent (tYC ≲ 1 Gyr) star formation. The measured age and mass fraction of the young stellar populations do not strongly trend with measurements of galaxy morphology. We note that massive (M > 1010.5 M ) recent star-forming ETGs appear to have larger sizes. Furthermore, high-mass, quiescent ETGs identified with likely companions populate a distinct region in the size-mass parameter space, in comparison with the distribution of massive ETGs with evidence of recent star formation (RSF). We conclude that both mechanisms of quenching star formation in disk-like ETGs and (gas-rich, minor) merger activity contribute to the formation of young stars and the size-mass evolution of intermediate redshift ETGs. The number of ETGs for which we have both HST WFC3 panchromatic (especially UV) imaging and spectroscopically confirmed redshifts is relatively small, therefore, a conclusion about the relative roles of both of these mechanisms remains an open question.

KW - galaxies: elliptical and lenticular, cD

KW - galaxies: evolution

KW - galaxies: star formation

KW - ultraviolet: galaxies

U2 - 10.1088/0004-637X/796/2/101

DO - 10.1088/0004-637X/796/2/101

M3 - Article

AN - SCOPUS:84911204151

VL - 796

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 101

ER -