U-band polarimetry of the radio-aligned optical continuum in the abell 1795 cluster central galaxy

Brian R. McNamara, Buell Tomasson Jannuzi, Richard Elston, Craig L. Sarazin, Michael Wise

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We have obtained U-band polarimetry of the lobes of blue optical continuum located along the z = 0.063 F-R I radio source in the Abell 1795 cluster central galaxy. We find an upper limit to the degree of polarization of the light emitted from the lobes of less than 7%. The accuracy of this measurement is limited by the presence of diluting background starlight. This limit is inconsistent with the lobes being scattered light that originated in an obscured, anisotropically radiating nucleus, unless the radiation is beamed and is viewed at an angle ≲22° to the line of sight, which is unlikely. The absence of a polarized signal and detailed correspondence between the radio lobes and optical lobes is inconsistent with synchrotron light. The blue optical lobes are probably regions of recent star formation. If a burst of star formation were triggered by the expanding radio lobes, the age of the burst population should be ∼107 yr. Then, the star formation rate in both lobes, assuming the local IMF, is ∼20 M yr-1, and the stellar mass of the lobes is ∼108 M. The material fueling the star formation and the radio source may have originated from the cooling flow or accretion from one or more gaseous cluster galaxies.

Original languageEnglish (US)
Pages (from-to)66-72
Number of pages7
JournalAstrophysical Journal
Volume469
Issue number1 PART I
StatePublished - 1996
Externally publishedYes

Fingerprint

polarimetry
lobes
radio
galaxies
continuums
star formation
IMF
polarization
bursts
accretion
cooling
refueling
star formation rate
stellar mass
line of sight
synchrotrons
nuclei
radiation

Keywords

  • Cooling flows
  • Galaxies: clusters: individual (A1795)
  • Galaxies: structure
  • Polarization

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

McNamara, B. R., Jannuzi, B. T., Elston, R., Sarazin, C. L., & Wise, M. (1996). U-band polarimetry of the radio-aligned optical continuum in the abell 1795 cluster central galaxy. Astrophysical Journal, 469(1 PART I), 66-72.

U-band polarimetry of the radio-aligned optical continuum in the abell 1795 cluster central galaxy. / McNamara, Brian R.; Jannuzi, Buell Tomasson; Elston, Richard; Sarazin, Craig L.; Wise, Michael.

In: Astrophysical Journal, Vol. 469, No. 1 PART I, 1996, p. 66-72.

Research output: Contribution to journalArticle

McNamara, BR, Jannuzi, BT, Elston, R, Sarazin, CL & Wise, M 1996, 'U-band polarimetry of the radio-aligned optical continuum in the abell 1795 cluster central galaxy', Astrophysical Journal, vol. 469, no. 1 PART I, pp. 66-72.
McNamara, Brian R. ; Jannuzi, Buell Tomasson ; Elston, Richard ; Sarazin, Craig L. ; Wise, Michael. / U-band polarimetry of the radio-aligned optical continuum in the abell 1795 cluster central galaxy. In: Astrophysical Journal. 1996 ; Vol. 469, No. 1 PART I. pp. 66-72.
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