Champions M82 NGC253 NGC1808 NGC6240 Mrk231 NGC1068 Arp220
Transcript of Champions M82 NGC253 NGC1808 NGC6240 Mrk231 NGC1068 Arp220
Markarian 357 (Mk357): uv-image tracing the young star clusters
STARBURST GALAXIES – course 2 ChampionsM82NGC253NGC1808NGC6240 Mrk231NGC1068Arp220
M82 (Uma A, 3C231, Arp337): nearby low-luminosity dwarf galaxy, brightest infrared source in the sky, with nuclear starburst, surrounded by hot ionised gas in ~500pc molecular torus; interacting with M81
Exploding cigar ….
L(FIR) ≈≈≈≈ 2 x 1011 L☼☼☼☼ M82 center: supernova remnants (> 30 years!), young supernovae and HII regions as seen in the radio;
M82’s spectacular X-ray halo superposed on host galaxy SNRs as well as massive X-ray binaries
Starburst-driven superwinds
SFRs orders of magn. higher than normal, plus SN rates in excess of 0.1/yr must have dynamical consequences: “starburst winds”
These are indeed seen on images and furthermore diagnosed from spectra (vel.broadening and line splitting)
Model: first bipolar cavity created by stellar mass loss, then bipolar outflow of SN driven hot gas
M82, NGC253, NGC1808, NGC3097, and many others
log (S60μμμμm /S 20cm) ≈≈≈≈ 2 : RADIO-FIR CORRELATION
!
NGC253starburst galaxy at d=2.5Mpc, displaying X-ray outflow, massive X-ray binaries (four centered on nucleus), and wind driven cavities
NGC253, as seen with HST
NGC1808d=12Mpc; warped dusty
disk; visible, infrared and radio hotspots inside
molec.gas ring; outflowing gas;
companion to NGC1792
NG
C180
8:
K-b
an
d /
Brγγγγ/ 10μμμμmBrγγγγ, [FeII], and H2
images are generally consistent with radio continuum (high resol.), and also to those in thermal IR
NGC6240d=120 Mpc; merging galaxy pair with tidal tails of stars, dust and gas; [NeII] but no Balmer or Brackett lines, hence post-starburst phase
[OIV] and [NeV] indicate* obscured AGN !
*55 vs. 99 eV: diagnosticL(FIR) ≈≈≈≈ 5 x 1011 L☼☼☼☼
NGC6240’s two accreting nuclei, imaged with Chandra
NGC4038/4039: The Antennae – another late merger
NGC1068[OIII] cones, NOT Hαααα ; aligned with radio jets; starburst in ring;
radio core in opaque dusty torus ���� AGN !
STARBURST – AGN SYMBIOSIS
NGC 1068(a) radio on 20 μμμμm(b) radio on 12 μμμμm(c) hi res radio on [OIII](d) with Brγγγγ contours(e) HII color plus CO contours(f) HII with 12 μμμμm and Brγγγγ
UV-selected Mk231:QSO & (warm) ULIRG with SFR of >100 M☼☼☼☼in circumnuclear ring
L(FIR) ≈≈≈≈ 3 x 1012 L☼☼☼☼Arp220$
prototypical ULIRG:* 90% of L in FIR* merger* extended @ 10μμμμm* ~ 1010 M☼☼☼☼ molec. gas
L(FIR) ≈≈≈≈ 2 x 1012 L☼☼☼☼$Resulting from IRAS BGS which yielded 324 galaxies brighter than 5Jy at 60 μμμμm (of which few were brighter than m=18 ...): 10 extra-ordinary objects !!
Classical SEDs!!
Hard-X-ray upper limits are below Seyfert/QSO figures for comparable luminosities, with exception of Mk231 (which has broad lines!)
Hot of the press ….
Note PAH-features (3.3, 6.2, 7.7 and 11.2 μμμμm) and silicate absorption (10μμμμm)
Note FIR strength and stars
Spitzer IRS spectra provide latest information
Assessing the starburst-AGN symbiosis:Infrared spectral line diagnostics:ISO, Spitzer, Herschel, …….