molecular hydrogen in the outer filaments surrounding ngc 1275 n.
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Molecular Hydrogen in the outer filaments surrounding NGC 1275. Nina Hatch CS Crawford, RM Johnstone, AC Fabian. IOA, Cambridge. Central Cluster Galaxy Emission-line nebulae. Emission line nebulae are found surrounding ~27% of CCG Bright and extended structure. Cowie et al 1983.

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molecular hydrogen in the outer filaments surrounding ngc 1275

Molecular Hydrogen in the outer filaments surrounding NGC 1275

Nina Hatch

CS Crawford, RM Johnstone,

AC Fabian

IOA, Cambridge

central cluster galaxy emission line nebulae
Central Cluster Galaxy Emission-line nebulae
  • Emission line nebulae are found surrounding ~27% of CCG
  • Bright and extended structure

Cowie et al 1983

  • Only find emission line nebulae if cluster
  • has a short radiative cooling time and
  • bright centrally peaked x-ray emission

Conselice et al 2001

slide3

Perseus: 200ks Chandra

Fabian et al 03

slide9

Edge et al, 2002

Similar line ratios found in outer filaments as in the nucleus – indicating similar ionising mechanism

slide12

Ionisation Mechanisms

  • Excitation source of optical filaments still uncertain
  • -short cooling time → gas continually ionised
  • - Soft X-ray/Hα indicate filaments radiate predominantly in optical → soft x-rays do not ionise
  • Possible mechanisms
  • UV photoionisation from nearby stars
  • -likely to be dominant mechanism in Eastern knot
  • shocks
  • conduction from hot ICM

Will analyse line ratios using CLOUDY

summary
Summary
  • Detection of molecular hydrogen ~ 25kpc from CCG, deeply embedded within hot ICM
  • Velocity shift between outer filaments and central nebula and within filaments
  • Spectra indicate different ionisation mechanisms acting on filaments