Near-infrared imaging of A z = 6.42 quasar host galaxy with the hubble space telescope wide field camera 3

M. Mechtley, Rogier Windhorst, R. E. Ryan, G. Schneider, S. H. Cohen, R. A. Jansen, X. Fan, N. P. Hathi, W. C. Keel, A. M. Koekemoer, H. Röttgering, Evan Scannapieco, D. P. Schneider, M. A. Strauss, H. J. Yan

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report on deep near-infrared F125W (J) and F160W (H) Hubble Space Telescope Wide Field Camera 3 images of the z = 6.42 quasar J1148+5251 to attempt to detect rest-frame near-ultraviolet emission from the host galaxy. These observations included contemporaneous observations of a nearby star of similar near-infrared colors to measure temporal variations in the telescope and instrument point-spread function (PSF). We subtract the quasar point source using both this direct PSF and a model PSF. Using direct subtraction, we measure an upper limit for the quasar host galaxy of mJ > 22.8 and m H > 23.0 AB mag (2 σ). After subtracting our best model PSF, we measure a limiting surface brightness from 03 to 05 radius of μJ > 23.5 and μH > 23.7 AB mag arcsec -2 (2 σ). We test the ability of the model subtraction method to recover the host galaxy flux by simulating host galaxies with varying integrated magnitude, effective radius, and Sérsic index, and conducting the same analysis. These models indicate that the surface brightness limit (μJ > 23.5 AB mag arcsec-2) corresponds to an integrated upper limit of mJ > 22-23 AB mag, consistent with the direct subtraction method. Combined with existing far-infrared observations, this gives an infrared excess log (IRX) > 1.0 and corresponding ultraviolet spectral slope β > -1.2 ± 0.2. These values match those of most local luminous infrared galaxies, but are redder than those of almost all local star-forming galaxies and z ≃ 6 Lyman break galaxies.

Original languageEnglish (US)
Article numberL38
JournalAstrophysical Journal Letters
Volume756
Issue number2
DOIs
StatePublished - Sep 10 2012

Fingerprint

Hubble Space Telescope
quasars
near infrared
cameras
galaxies
point spread functions
subtraction
brightness
point source
temporal variation
stars
radii
ultraviolet emission
point sources
telescopes
slopes
color
conduction
method

Keywords

  • Galaxies: high-redshift
  • Methods: observational
  • Quasars: individual (SDSS J1148+5251)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Near-infrared imaging of A z = 6.42 quasar host galaxy with the hubble space telescope wide field camera 3. / Mechtley, M.; Windhorst, Rogier; Ryan, R. E.; Schneider, G.; Cohen, S. H.; Jansen, R. A.; Fan, X.; Hathi, N. P.; Keel, W. C.; Koekemoer, A. M.; Röttgering, H.; Scannapieco, Evan; Schneider, D. P.; Strauss, M. A.; Yan, H. J.

In: Astrophysical Journal Letters, Vol. 756, No. 2, L38, 10.09.2012.

Research output: Contribution to journalArticle

Mechtley, M, Windhorst, R, Ryan, RE, Schneider, G, Cohen, SH, Jansen, RA, Fan, X, Hathi, NP, Keel, WC, Koekemoer, AM, Röttgering, H, Scannapieco, E, Schneider, DP, Strauss, MA & Yan, HJ 2012, 'Near-infrared imaging of A z = 6.42 quasar host galaxy with the hubble space telescope wide field camera 3', Astrophysical Journal Letters, vol. 756, no. 2, L38. https://doi.org/10.1088/2041-8205/756/2/L38
Mechtley, M. ; Windhorst, Rogier ; Ryan, R. E. ; Schneider, G. ; Cohen, S. H. ; Jansen, R. A. ; Fan, X. ; Hathi, N. P. ; Keel, W. C. ; Koekemoer, A. M. ; Röttgering, H. ; Scannapieco, Evan ; Schneider, D. P. ; Strauss, M. A. ; Yan, H. J. / Near-infrared imaging of A z = 6.42 quasar host galaxy with the hubble space telescope wide field camera 3. In: Astrophysical Journal Letters. 2012 ; Vol. 756, No. 2.
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AU - Schneider, G.

AU - Cohen, S. H.

AU - Jansen, R. A.

AU - Fan, X.

AU - Hathi, N. P.

AU - Keel, W. C.

AU - Koekemoer, A. M.

AU - Röttgering, H.

AU - Scannapieco, Evan

AU - Schneider, D. P.

AU - Strauss, M. A.

AU - Yan, H. J.

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