Lens Model and Source Reconstruction Reveal the Morphology and Star Formation Distribution in the Cool Spiral LIRG SGAS J143845.1+145407

We present Hubble Space Telescope (HST) imaging and grism spectroscopy of a strongly lensed LIRG at z = 0.816, SGAS 143845.1+145407, and use the magnification boost of gravitational lensing to study the distribution of star formation throughout this galaxy. Based on the HST imaging data, we create a...

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Bibliographic Details
Published in:The Astrophysical journal 2019-04, Vol.875 (1), p.18
Main Authors: Dunham, Samuel J., Sharon, Keren, Florian, Michael K., Rigby, Jane R., Gladders, Michael D., Bayliss, Matthew B., Dahle, Håkon, Johnson, Traci L., Murray, Katherine, Whitaker, Katherine E., Wuyts, Eva
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Galactic clusters
Galactic evolution
Galaxies
galaxies: clusters: individual (SDSS J1438+1454)
Galaxy distribution
Gravitational lenses
gravitational lensing: strong
H alpha line
Hubble Space Telescope
Image reconstruction
Mass distribution
Morphology
Space telescopes
Spectroscopy
Spectrum analysis
Star & galaxy formation
Star formation
Stars & galaxies
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Summary:We present Hubble Space Telescope (HST) imaging and grism spectroscopy of a strongly lensed LIRG at z = 0.816, SGAS 143845.1+145407, and use the magnification boost of gravitational lensing to study the distribution of star formation throughout this galaxy. Based on the HST imaging data, we create a lens model for this system; we compute the mass distribution and magnification map of the z = 0.237 foreground lens. We find that the magnification of the lensed galaxy ranges between 2 and 10, with a total magnification (measured over all the images of the source) of = . We find that the total projected mass density within ∼34 kpc of the brightest cluster galaxy is . Using the lens model we create a source reconstruction for SGAS 143845.1+145407, which, paired with a faint detection of H in the grism spectroscopy, allows us to finally comment directly on the distribution of star formation in a z ∼ 1 LIRG. We find widespread star formation across this galaxy, in agreement with the current understanding of these objects. However, we note a deficit of H emission in the nucleus of SGAS 143845.1+145407, likely due to dust extinction.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab0d7d