Resolving star formation on subkiloparsec scales in the high-redshift galaxy SDP.11 using gravitational lensing

Lamarche, C; Verma, A; Vishwas, A; Stacey, G; Brisbin, D; Ferkinhoff, C; Nikola, T; Higdon, S; Higdon, J; Tecza, M

Journal article

Resolving star formation on subkiloparsec scales in the high-redshift galaxy SDP.11 using gravitational lensing

Abstract:: We investigate the properties of the interstellar medium, star formation, and the current-day stellar population in the strongly lensed star-forming galaxy H-ATLAS J091043.1-000321 (SDP.11), at z = 1.7830, using new Herschel and Atacama Large Millimeter/submillimeter Array (ALMA) observations of far-infrared fine-structure lines of carbon, oxygen, and nitrogen. We report detections of the [O iii] 52 μm, [N iii] 57 μm, and [O i] 63 μm lines from Herschel/PACS, and present high-resolution imaging of the [C ii] 158 μm line, and underlying continuum, using ALMA. We resolve the [C ii] line emission into two spatially offset Einstein rings, tracing the red and blue velocity components of the line, in the ALMA/Band 9 observations at 0farcs2 resolution. The values seen in the [C ii]/far-infrared (FIR) ratio map, as low as ~0.02% at the peak of the dust continuum, are similar to those of local ULIRGs, suggesting an intense starburst in this source. This is consistent with the high intrinsic FIR luminosity (~3 × 1012 L ⊙), ~16 Myr gas depletion timescale, and lesssim8 Myr timescale since the last starburst episode, estimated from the hardness of the UV radiation field. By applying gravitational lensing models to the visibilities in the uv-plane, we find that the lensing magnification factor varies by a factor of two across SDP.11, affecting the observed line profiles. After correcting for the effects of differential lensing, a symmetric line profile is recovered, suggesting that the starburst present here may not be the result of a major merger, as is the case for local ULIRGs, but instead could be powered by star formation activity spread across a 3–5 kpc rotating disk.

Publication status:: Published

Peer review status:: Peer reviewed

Actions

Email

Email this record

Send the bibliographic details of this record to your email address.

Your Email
Please enter the email address that the record information will be sent to.

-
Your message (optional)
Please add any additional information to be included within the email.
Cite

Cite this record

APA Style

Lamarche, C., Verma, A., Vishwas, A., Stacey, G., Brisbin, D., Ferkinhoff, C., Nikola, T., Higdon, S., Higdon, J., & Tecza, M. (2018). Resolving star formation on subkiloparsec scales in the high-redshift galaxy SDP.11 using gravitational lensing. Astrophysical Journal, 867(2).

MLA Style

Lamarche, C., et al. “Resolving Star Formation on Subkiloparsec Scales in the High-Redshift Galaxy SDP.11 Using Gravitational Lensing.” Astrophysical Journal, vol. 867, no. 2, American Astronomical Society, 2018.

Chicago Style

Lamarche, C, A Verma, A Vishwas, G Stacey, D Brisbin, C Ferkinhoff, T Nikola, S Higdon, J Higdon, and M Tecza. 2018. “Resolving Star Formation on Subkiloparsec Scales in the High-Redshift Galaxy SDP.11 Using Gravitational Lensing.” Astrophysical Journal 867 (2).
Share
Print