Testing the Jet Quenching Paradigm with an Ultradeep Observation of a Steadily Soft State Black Hole

D M Russell, J CA Miller-Jones, Thomas Maccarone, Y J Yang, R P Fender, F Lewis

Research output: Contribution to journalArticlepeer-review

Abstract

We present ultradeep radio observations with the Expanded Very Large Array of 4U 1957+11, a Galactic black hole (BH) candidate X-ray binary known to exist in a persistent soft X-ray state. We derive a stringent upper limit of 11.4 μJy beam-1 (3σ) at 5-7 GHz, which provides the most rigorous upper limit to date on the presence of jets in a soft state BH X-ray binary (BHXB). X-ray, UV, and optical fluxes obtained within a few weeks of the radio data can be explained by thermal emission from the disk. At this X-ray luminosity, a hard state BHXB that follows the established empirical radio-X-ray correlation would be at least 330-810 times brighter at radio frequencies, depending on the distance to 4U 1957+11. This jet quenching of >2.5 orders of magnitude is greater than some models predict and implies that the jets are prevented from being launched altogether in the soft state. 4U 1957+11 is also more than one order of magnitude fainter than the faintest of the "radio-quiet" population
Original languageEnglish
Pages (from-to)L19
JournalAstrophysical Journal Letters
StatePublished - Sep 2011

Fingerprint Dive into the research topics of 'Testing the Jet Quenching Paradigm with an Ultradeep Observation of a Steadily Soft State Black Hole'. Together they form a unique fingerprint.

Cite this