Hα imaging of the candidate protogalaxy MS 1512-cB58

Jill Bechtold; H. K.C. Yee; Richard Elston; E. Ellinoson

doi:10.1086/310520

Hα imaging of the candidate protogalaxy MS 1512-cB58

Jill Bechtold, H. K.C. Yee, Richard Elston, E. Ellinoson

Steward Observatory

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17 Scopus citations

Abstract

We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on Hα redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 Å, and luminosity of 3 × 10⁴³ h^-2₇₅ ergs s^-1 (q₀ = 0.1). Assuming that the excess emission arises from nebular Hα associated with H II regions, the observed luminosity implies a star formation rate of 285 M_⊙ yr^-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 Å, along with models for the spectral energy distribution, indicate a star formation rate about a factor of 12 greater. We discuss plausible explanations for this discrepancy and possible future observations that may clarify the situation. 1997 The American Astronomical Society. All rights reserved.

Original language	English (US)
Pages (from-to)	L29-L32
Journal	Astrophysical Journal
Volume	477
Issue number	1 PART II
DOIs	https://doi.org/10.1086/310520
State	Published - 1997

Keywords

Galaxies: evolution
Galaxies: formation
Galaxies: individual (MS 1512-cB58)
Galaxies: starburst

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/310520

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@article{de731ed90a2542c28ccf8ba5efd70d29,

title = "Hα imaging of the candidate protogalaxy MS 1512-cB58",

abstract = "We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on Hα redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 {\AA}, and luminosity of 3 × 1043 h-275 ergs s-1 (q0 = 0.1). Assuming that the excess emission arises from nebular Hα associated with H II regions, the observed luminosity implies a star formation rate of 285 M⊙ yr-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 {\AA}, along with models for the spectral energy distribution, indicate a star formation rate about a factor of 12 greater. We discuss plausible explanations for this discrepancy and possible future observations that may clarify the situation. 1997 The American Astronomical Society. All rights reserved.",

keywords = "Galaxies: evolution, Galaxies: formation, Galaxies: individual (MS 1512-cB58), Galaxies: starburst",

author = "Jill Bechtold and Yee, {H. K.C.} and Richard Elston and E. Ellinoson",

note = "Funding Information: We thank the staff of the IRTF for their support of these observations. J. B. appreciates useful discussions with R. Kennicutt and financial support from NSF grant AST-9058510.",

year = "1997",

doi = "10.1086/310520",

language = "English (US)",

volume = "477",

pages = "L29--L32",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 PART II",

}

TY - JOUR

T1 - Hα imaging of the candidate protogalaxy MS 1512-cB58

AU - Bechtold, Jill

AU - Yee, H. K.C.

AU - Elston, Richard

AU - Ellinoson, E.

N1 - Funding Information: We thank the staff of the IRTF for their support of these observations. J. B. appreciates useful discussions with R. Kennicutt and financial support from NSF grant AST-9058510.

PY - 1997

Y1 - 1997

N2 - We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on Hα redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 Å, and luminosity of 3 × 1043 h-275 ergs s-1 (q0 = 0.1). Assuming that the excess emission arises from nebular Hα associated with H II regions, the observed luminosity implies a star formation rate of 285 M⊙ yr-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 Å, along with models for the spectral energy distribution, indicate a star formation rate about a factor of 12 greater. We discuss plausible explanations for this discrepancy and possible future observations that may clarify the situation. 1997 The American Astronomical Society. All rights reserved.

AB - We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on Hα redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 Å, and luminosity of 3 × 1043 h-275 ergs s-1 (q0 = 0.1). Assuming that the excess emission arises from nebular Hα associated with H II regions, the observed luminosity implies a star formation rate of 285 M⊙ yr-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 Å, along with models for the spectral energy distribution, indicate a star formation rate about a factor of 12 greater. We discuss plausible explanations for this discrepancy and possible future observations that may clarify the situation. 1997 The American Astronomical Society. All rights reserved.

KW - Galaxies: evolution

KW - Galaxies: formation

KW - Galaxies: individual (MS 1512-cB58)

KW - Galaxies: starburst

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U2 - 10.1086/310520

DO - 10.1086/310520

M3 - Article

AN - SCOPUS:0038858692

SN - 0004-637X

VL - 477

SP - L29-L32

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART II

ER -

Hα imaging of the candidate protogalaxy MS 1512-cB58

Abstract

Keywords

ASJC Scopus subject areas

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