1 / 19

Radio source surveys and populations

Radio source surveys and populations. Ken Kellermann. National Radio Astronomy Observatory. R adio S urvey Discoveries. R adio galaxies (1949) Cosmic evolution (1955 ) Quasars (1963) IPS (1964 ) Pulsars (1967) Gravitational lenses (1979). Radio source surveys and populations.

iain
Download Presentation

Radio source surveys and populations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Radio source surveys and populations Ken Kellermann National Radio Astronomy Observatory

  2. Radio Survey Discoveries • Radio galaxies(1949) • Cosmic evolution (1955) • Quasars (1963) • IPS (1964) • Pulsars (1967) • Gravitational lenses (1979) Georgefest

  3. Radio source surveys and populations • Radio source surveys • History • Curent status • Problems • VLA and JVLA Deep Surveys • CDFS & ECDFS • Lockman Hole (SWIRES) • Populations • Strong source population • MicroJy population • NanoJy population? • RQ Quasars Georgefest

  4. Radio Source Surveys 13,000 hr 3000 hr 2400 hr 2000 hr 1700 hr 1000 hr Norris et al., 2013 Georgefest

  5. Radio galaxies “Positions of Three Discrete Sources of Galactic Radio-Frequency Radiation” – Bolton, Stanley, and Slee, 1949 NGC 5128 Crab M87 1954 Cygnus A, z = 0.05 Baade & Minkowski, 1954 Georgefest

  6. Radio Source Counts Sydney Mills Cross Bernie Mills X = -1.85 X = - 3 Cambridge 2C and 3C Martin Ryle Georgefest

  7. Radio Source Surveys VLA, WSRT, ATCA, GMRT Molonglo100 MHz – 22 GHze-MERLIN, LOFAR, ASKAP, MeerKAT, SKA All Sky surveys Cosmology-Large Scale Structure FR I & FR II Radio Galaxies, RL Quasars Limited Area Surveys Populations – Galaxy Evolution AGN, SFG, RQ Quasars E-CDFS HDFN HDFS COSMOS SWIRES - Lockman Hole Phoenix • NVSS • FIRST • WENSS • SUMSS • AT20 Georgefest

  8. Owen & Morrison, 2008 Condon (1984) compilation FR I & FR II Radio Galaxies – Quasars Kellermann et al., 2008 Georgefest

  9. JVLA Observations of the Owen- Morrison field (SWIRE) Lockman Hole) • α = 10h46m00s, δ = +59°01′00″ • (2 GHz BW) • C configuration (3-km) • θ = 8 arcsec • τ = 50 hrs • σn = 1.0 μJy • σc= 1.2 μJy Georgefest

  10. MicroJy Radio Source Counts • Sample Variance – NO • Noise bias • Statistical weight corrections • primary beam • Bandwidth smearing • Time smearing corrections • Multiple component sources • Resolution corrections O&M 2008 Condon 1989 Condon 2012 • Problems • μJy count discrepancy • natural confusion at 100 nJy • Non thermal sky temperature Log Jy Georgefest

  11. ARCADE 2 – Excess Sky Brightness 3, 8, 10, 30, 90 GHz (Fixen et al. 2011) Georgefest

  12. Sky background implications survey limits ARCADE 2 Condon, 1989; Wilman 2008 Condon et al., 2012

  13. VLA Survey of the CDFS • Chandra 4 Msec Survey (Xue et al. 2011) • 740 X-ray sources • ergs/sec • VLA Survey (Miller et al., ApJS 205, 2013) • 20 cm; 240 hrs; 6 pointings; Ω = 0.3 deg • VLA C configuration (1.6 x 2.8 arcmin resolution) • σ = 6.4 μJy • 883 radio sources S > 37 μJy • 268 detected at X-rays (Vattakunnel et al, 2010) • 839 (95%) OIR counterparts • 678 (82%) redshifts - 274 spectroscopic (Bonzini et al. 2012) • Spitzer IRAC SIMPLE 3.6, 4.5, 5.8, 8 μm (91%) (Damen et al. 2010) • Spitzer MIPS FIDEL 24 μm (88%) (Dickenson et al. 2007) • Population Classification (Bonzini et al. submitted) Georgefest

  14. Chandra Deep Field South 4 Msecexposure 740 X-ray sources S >10-17 ergs/sec 7.5 μJy VLA 6.5 μJy ESO 2.2m/WFI z < 27.3 Spectra - VLT GOODS-S HST B, V, I, z < 28 IRAC 3.6, 4.5, 5.8. 8.0 μm MIPS FIDEL 24 μm MUSYC K (VLT) < 22.4 Hubble UDF 976 ks exposure B, V, I, z 10,000 galaxies mag 29 Georgefest

  15. S > • S > 1 mJy • FR I & FR II RG • RL Qusars Star forming galaxies Radio-FIR: q ~1.7 R = log(Sr/SV) < 1.7 Lr<1024 W/Hz Not E galaxy Lx< 1042 ergs/sec No VLBI component • RL AGN • R > 1.4 • Lx> 1042 ergs/sec • NIR (IRAC) colors • FIR: q < 1.7 • RQ AGN • R 1.4 • Lx> 1042 ergs/sec • NIR (IRAC) colors • FIR: q ~ 1.7 • μJy radio sources • SFG • AGN • RL AGN • RQ AGN (SF) Georgefest Padovani et al. in preparation

  16. Quasi-stellar Galaxies Georgefest

  17. Radio Loud and Radio Quiet QSOsTwo populations? Separate Population Continuous Distribution White et al. 2000 Lacy et al., , 2001 Cirasuolo, et al. 2003 Barvainis, et al., 2005 Rafter et al., 2009 Mahony et al. 2012 • Kellermann et al., 1989, 1994 • Miller, et al, 1990, 1993 • Sopp & Alexander, 1991 • Visnovsky et al., 1992 • Peterson, 1997 • Kukula et al., 1998 • Krolik, 1999 • Kembhavi & Narlikar, 1999 • Ivezic, et al., 2002, 2004 • Laor, 2004 • Jiang et al. 2007 • White et al., 2007 • Zamfir et al., 2008 • Balokovic et al., 2012 • Kimball et al., 2011 • Condon et al., 2013 Georgefest

  18. JVLA Observations of SDSS QSOs Kimball et al. 2012, ApJ ,739, L29 • 179 SDSS QSOs • ; Mi < - 23 • RQ QSOs W/Hz • RQ QSOs due to SF in host galaxy Georgefest

  19. Summary • All Sky surveys sample powerful radio galaxies and quasars • S > 1 mJy • First indication of cosmic evolution. • microJy radio sources are driven by a mixture of SF and SMBHs • RQ QSOs differ from RL QSOs and are powered primarily by star formation in the host galaxy. • ARCADE 2 observations suggest a population of nanoJy sources not associated with galaxies • Number Counts rapidly converge at low flux desnities • SKA will not be limited by natural confusion • The JVLA is by far the most sensitive radio telescope available • Will learn more about submicroJy population Georgefest

More Related