The distant, galaxy cluster environment of the short GRB 161104a at z ∼ 0.8 and a comparison to the short GRB host population

A. E. Nugent, Wen-fai Fong, Y. Dong, A. Palmese, J. Leja, A. Rouco Escorial, P. K. Blanchard, K. Paterson, R. Chornock, A. Monson, M. Nicholl, E. Berger

Research output: Contribution to journalArticlepeer-review

Abstract

We present optical observations of the Swift short-duration gamma-ray burst (GRB) GRB 161104A and its host galaxy at z = 0.793 ± 0.003. We model the multiband photometry and spectroscopy with the stellar population inference code Prospector and explore the posterior using nested sampling. We find a mass-weighted age of tm = 2.12+0.23 -0.21 Gyr, stellar mass of log(M/M⊙) = 10.21 ±0.04, metallicity of log (Z/Z⊙) = - 0.08+0.06 0.05, dust extinction of AV = 0.08+0.08 -0.05, and low star formation rate of 9.9 × 10-2 Me yr-1. These properties, along with a prominent 4000 Å break and optical absorption lines, classify this host as an early-type, quiescent galaxy. Using Dark Energy Survey galaxy catalogs, we demonstrate that the host of GRB 161104A resides on the outskirts of a galaxy cluster at z ≈ 0.8, situated ≈1 Mpc from the likely brightest cluster galaxy. We also present new modeling for 20 additional short GRB hosts (≈33% of which are early-type galaxies), finding population medians of log (M/M⊙) = -9.94+0.98 0.88 and tm = 1.07+1.98 -0.67 Gyr (68% confidence). We further find that the host of GRB 161104A is more distant, less massive, and younger than the four other short GRB hosts known to be associated with galaxy clusters. Cluster short GRBs have faint afterglows, in the lower ≈11% (≈30%) of observed X-ray (optical) luminosities. We place a lower limit on the fraction of short GRBs in galaxy clusters versus those in the field of ≈5%*13%, consistent with the fraction of stellar mass of ≈10%*20% in galaxy clusters at redshifts 0.1≤ z ≤0.8. Future studies that take advantage of wider-field and deeper cluster surveys are needed to understand the true rate of short GRBs in clusters and their effect on heavy-element enrichment in the intracluster medium.

Original languageEnglish (US)
Article numberabc24a
JournalAstrophysical Journal
Volume904
Issue number1
DOIs
StatePublished - Nov 20 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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