The Atacama Cosmology Telescope: Detection of Millimeter-wave Transient Sources

Sigurd Naess, Nick Battaglia, J. Richard Bond, Erminia Calabrese, Steve K. Choi, Nicholas F. Cothard, Mark Devlin, Cody J. Duell, Adriaan J. Duivenvoorden, Jo Dunkley, Rolando Dünner, Patricio A. Gallardo, Megan Gralla, Yilun Guan, Mark Halpern, J. Colin Hill, Matt Hilton, Kevin M. Huffenberger, Brian J. Koopman, Arthur B. KosowskyMathew S. Madhavacheril, Jeff McMahon, Federico Nati, Michael D. Niemack, Lyman Page, Bruce Partridge, Maria Salatino, Neelima Sehgal, David N. Spergel, Suzanne Staggs, Edward J. Wollack, Zhilei Xu

Research output: Contribution to journalArticlepeer-review

Abstract

We report on the serendipitous discovery of three transient millimeter-wave sources using data from the Atacama Cosmology Telescope. The first, detected at R.A. = 273.8138, decl. = -49.4628 at ∼50σ total, brightened from less than 5 mJy to at least 1100 mJy at 150 GHz with an unknown rise time shorter than 13 days, during which the increase from 250 mJy to 1100 mJy took only 8 minutes. Maximum flux was observed on 2019 November 8. The source's spectral index in flux between 90-150 GHz was positive, α = 1.5 ± 0.2. The second, detected at R.A. = 105.1584, decl. = -11.2434 at ∼20σ total, brightened from less than 20 mJy to at least 300 mJy at 150 GHz with an unknown rise time shorter than 8 days. Maximum flux was observed on 2019 December 15. Its spectral index was also positive, α = 1.8 ± 0.2. The third, detected at R.A. = 301.9952, decl. = 16.1652 at ∼40σ total, brightened from less than 8 mJy to at least 300 mJy at 150 GHz over a day or less but decayed over a few days. Maximum flux was observed on 2018 September 11. Its spectrum was approximately flat, with a spectral index of α = -0.2 ± 0.1. None of the sources were polarized to the limits of these measurements. The two rising-spectrum sources are coincident in position with M and K stars, while the third is coincident with a G star.

Original languageEnglish (US)
Article number14
JournalAstrophysical Journal
Volume915
Issue number1
DOIs
StatePublished - Jul 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'The Atacama Cosmology Telescope: Detection of Millimeter-wave Transient Sources'. Together they form a unique fingerprint.

Cite this