Q1549-C25: A CLEAN SOURCE of LYMAN-CONTINUUM EMISSION at z < 3.15

Alice E. Shapley, Charles C. Steidel, Allison L. Strom, Milan Bogosavljevic, Naveen A. Reddy, Brian Siana, Robin E. Mostardi, Gwen C. Rudie

Research output: Contribution to journalArticle

Abstract

We present observations of Q1549-C25, an L∗star-forming galaxy at z<3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermore, the morphology of Q1549-C25 in V606, J125, and H160 Hubble Space TelESCope (HST) imaging reveals that the object consists of a single, isolated component within 1?. In combination, these data indicate Q1549-C25 as a clean spectroscopic detection of LyC radiation, only the second such object discovered to date at Z3. We model the spectral energy distribution of Q1549-C25, finding evidence of negligible dust extinction, an age (assuming continuous star formation) of1 Gyr, and a stellar mass of M∗< 7.9 109 M⊙. Although it is not possible to derive strong constraints on the absolute ESCape fraction of LyC emission, fESC(LyC), from a single object, we use simulations of intergalactic and circumgalactic absorption to infer fESC (LyC) ≥ 0.51 at 95% confidence. The combination of deep Keck/LRIS spectroscopy and Hubble Space TelESCope imaging is required to assemble a larger sample of objects like Q1549-C25, and obtain robust constraints on the average fESC(LyC) at z 3 and beyond.

Original languageEnglish (US)
Article numberL24
JournalAstrophysical Journal Letters
Volume826
Issue number2
DOIs
StatePublished - Aug 1 2016

Fingerprint

spectroscopy
continuums
extinction
dust
Hubble Space Telescope
simulation
energy
noise spectra
radiation
spectral energy distribution
stellar mass
line of sight
escape
star formation
confidence
contamination
galaxies
distribution
detection
noise spectrum

Keywords

  • Cosmology: Observations
  • Diffuse radiation
  • Galaxies: High-redshift
  • Intergalactic Medium

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Shapley, A. E., Steidel, C. C., Strom, A. L., Bogosavljevic, M., Reddy, N. A., Siana, B., ... Rudie, G. C. (2016). Q1549-C25: A CLEAN SOURCE of LYMAN-CONTINUUM EMISSION at z < 3.15. Astrophysical Journal Letters, 826(2), [L24]. https://doi.org/10.3847/2041-8205/826/2/L24

Q1549-C25 : A CLEAN SOURCE of LYMAN-CONTINUUM EMISSION at z < 3.15. / Shapley, Alice E.; Steidel, Charles C.; Strom, Allison L.; Bogosavljevic, Milan; Reddy, Naveen A.; Siana, Brian; Mostardi, Robin E.; Rudie, Gwen C.

In: Astrophysical Journal Letters, Vol. 826, No. 2, L24, 01.08.2016.

Research output: Contribution to journalArticle

Shapley, AE, Steidel, CC, Strom, AL, Bogosavljevic, M, Reddy, NA, Siana, B, Mostardi, RE & Rudie, GC 2016, 'Q1549-C25: A CLEAN SOURCE of LYMAN-CONTINUUM EMISSION at z < 3.15', Astrophysical Journal Letters, vol. 826, no. 2, L24. https://doi.org/10.3847/2041-8205/826/2/L24
Shapley, Alice E. ; Steidel, Charles C. ; Strom, Allison L. ; Bogosavljevic, Milan ; Reddy, Naveen A. ; Siana, Brian ; Mostardi, Robin E. ; Rudie, Gwen C. / Q1549-C25 : A CLEAN SOURCE of LYMAN-CONTINUUM EMISSION at z < 3.15. In: Astrophysical Journal Letters. 2016 ; Vol. 826, No. 2.
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abstract = "We present observations of Q1549-C25, an L∗star-forming galaxy at z<3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermore, the morphology of Q1549-C25 in V606, J125, and H160 Hubble Space TelESCope (HST) imaging reveals that the object consists of a single, isolated component within 1?. In combination, these data indicate Q1549-C25 as a clean spectroscopic detection of LyC radiation, only the second such object discovered to date at Z3. We model the spectral energy distribution of Q1549-C25, finding evidence of negligible dust extinction, an age (assuming continuous star formation) of1 Gyr, and a stellar mass of M∗< 7.9 109 M⊙. Although it is not possible to derive strong constraints on the absolute ESCape fraction of LyC emission, fESC(LyC), from a single object, we use simulations of intergalactic and circumgalactic absorption to infer fESC (LyC) ≥ 0.51 at 95{\%} confidence. The combination of deep Keck/LRIS spectroscopy and Hubble Space TelESCope imaging is required to assemble a larger sample of objects like Q1549-C25, and obtain robust constraints on the average fESC(LyC) at z 3 and beyond.",
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AU - Strom, Allison L.

AU - Bogosavljevic, Milan

AU - Reddy, Naveen A.

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AU - Mostardi, Robin E.

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AB - We present observations of Q1549-C25, an L∗star-forming galaxy at z<3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermore, the morphology of Q1549-C25 in V606, J125, and H160 Hubble Space TelESCope (HST) imaging reveals that the object consists of a single, isolated component within 1?. In combination, these data indicate Q1549-C25 as a clean spectroscopic detection of LyC radiation, only the second such object discovered to date at Z3. We model the spectral energy distribution of Q1549-C25, finding evidence of negligible dust extinction, an age (assuming continuous star formation) of1 Gyr, and a stellar mass of M∗< 7.9 109 M⊙. Although it is not possible to derive strong constraints on the absolute ESCape fraction of LyC emission, fESC(LyC), from a single object, we use simulations of intergalactic and circumgalactic absorption to infer fESC (LyC) ≥ 0.51 at 95% confidence. The combination of deep Keck/LRIS spectroscopy and Hubble Space TelESCope imaging is required to assemble a larger sample of objects like Q1549-C25, and obtain robust constraints on the average fESC(LyC) at z 3 and beyond.

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