تقرير
Lens Model and Source Reconstruction Reveal the Morphology and Star Formation Distribution in the Cool Spiral LIRG SGAS J143845.1$+$145407
| العنوان: | Lens Model and Source Reconstruction Reveal the Morphology and Star Formation Distribution in the Cool Spiral LIRG SGAS J143845.1$+$145407 |
|---|---|
| المؤلفون: | 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 |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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 $\mu=11.8^{+4.6}_{-2.4}$. We find that the total projected mass density within $\sim34$ kpc of the brightest cluster galaxy is $6.0^{+0.3}_{-0.7}\times10^{12}\,M_{\odot}$. Using the lens model we create a source reconstruction for SGAS 143845.1$+$145407, which paired with a faint detection of H$\alpha$ in the grism spectroscopy, allows us to finally comment directly on the distribution of star formation in a $z\sim1$ 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$\alpha$ emission in the nucleus of SGAS 143845.1$+$145407, likely due to dust extinction. Comment: 7 pages, 8 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ab0d7d |
| URL الوصول: | http://arxiv.org/abs/1903.00532 |
| رقم الأكسشن: | edsarx.1903.00532 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ab0d7d |
|---|