Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22...
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Transcript of Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22...
![Page 1: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/1.jpg)
Past, Present and Future Star Formation in High Redshift Radio Galaxies
Nick Seymour (MSSL/UCL)
22nd Nov 2009 - Powerful Radio Galaxies
![Page 2: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/2.jpg)
Past, Present and Future Star Formation in High Redshift Radio Galaxies
Nick Seymour (MSSL/UCL)
22nd Nov 2009 Powerful Radio Galaxies
IRAC false-colour image of 4C23.56
![Page 3: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/3.jpg)
High-z Radio Galaxies
• Powerful active nuclei from massive black holes
![Page 4: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/4.jpg)
High-z Radio Galaxies
• Powerful active nuclei from massive black holes
• High host galaxy masses imply DMH by z=0 of ~1014M
![Page 5: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/5.jpg)
Connection Between Star Formation and Black Hole Growth
• Correlation between central black hole mass and host galaxy bulge mass
• Similar shape of black hole and galaxy mass function
• Similar evolution over cosmic time• Some direct evidence, e.g. outflows
![Page 6: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/6.jpg)
Connection Between Star Formation and Black Hole Growth
• Correlation between central black hole mass and host galaxy bulge mass
• Similar shape of black hole and galaxy mass function
• Similar evolution over cosmic time• Some direct evidence, e.g. outflows• Keep the theoreticians happy!
![Page 7: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/7.jpg)
High-z Radio Galaxies Are Unique Laboratories to Study Star Formation
• Past stellar assembly can be derived from current stellar population (near-IR: stellar mass)
• Current star formation (sub-mm: far-IR luminosities and PAH: UV ionisation strength)
• Future star formation (environmental studies: future mergers and tidal interactions)
![Page 8: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/8.jpg)
Measures of Star Formation Past
![Page 9: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/9.jpg)
K-z or Hubble diagram for radio galaxies
Rocca-Volmerange et al. 2004
![Page 10: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/10.jpg)
K-z or Hubble diagram for radio galaxies
Rocca-Volmerange et al. 2004
1012M
![Page 11: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/11.jpg)
H-band Stellar Luminosities of HzRGs
SHzRG sample: z>1 L3GHz>1026WHz-1 Seymour et al. 2007, De Breuck et al. 2010
StellarLuminosities
![Page 12: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/12.jpg)
Stellar masses of HzRGs
Galaxy Mass(Kroupa IMF)
Now 7Gyr 10Gyr Look back time
Seymour et al. 2007, De Breuck et al. 2010
![Page 13: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/13.jpg)
Stellar Mass/Radio Luminosity Relation
*
* selection function biased towards red ellipticals (Donoso et al. 2008) and 1.4GHz converted to 3GHz assuming spectral index of -0.8
Seymour, De Breuck et al. 2010
![Page 14: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/14.jpg)
Measures of Star Formation Present
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Current constrains on SFR
SFRs inferred from sub-mm detections
SFR
![Page 16: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/16.jpg)
Current constrains on SFR
SFRs inferred from sub-mm detections
SFR/stellar mass
![Page 17: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/17.jpg)
Current constrains on SFR
1/SSFR
![Page 18: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/18.jpg)
Current constrains on SFR
![Page 19: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/19.jpg)
Star formation in High Redshift Radio Galaxies
• PAH emission features + lots of cold dust = high star formation rate
• This massive galaxy is still growing extremely rapidly
• Direct observations of coeval black hole and host galaxy growth
Seymour et al. (2008)
![Page 20: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/20.jpg)
Further IRS Spectroscopy of HzRGs
J. Rawlings et al. (2010)
Aim: to study SFR as function of radio luminosity and radio morphology at z~2.
![Page 21: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/21.jpg)
Further IRS Spectroscopy of HzRGs
J. Rawlings et al. (2010)
![Page 22: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/22.jpg)
Measures of Star Formation Yet to Come
![Page 23: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/23.jpg)
Future of Growth of Radio Galaxies
• MRC 1138-262 (the Spiderweb galaxy) at z=2.157 will eat or destroy most of its companions by z=0 (Hatch et al. 2009).
• 4c23.56 (z=2.483) has a companion galaxy with similar mass, 4C23.56 ER1 (A. Stockton et al., 2004) at 30asec ~240kpc with a merging time of ~5Gyrs (hence likely major merger of ~5x1011M at z~0.6)
MRC 1138-262Spiderweb GalaxyMiley et al. (2006)
ACS greyscaleRadio contoursLyman Alpha
![Page 24: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/24.jpg)
4c23.56 z=2.48
24um images
![Page 25: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/25.jpg)
Over-densities at 24um Around Radio Galaxies
![Page 26: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/26.jpg)
Other environmental evidence
• Red sequence seen around z~1.5 HzRGs, over abundance of AGN (Galametz et al. 2009)
• Red and passive galaxies seen around z~3 HzRGs (Doherty et al. 2009)
![Page 27: Past, Present and Future Star Formation in High Redshift Radio Galaxies Nick Seymour (MSSL/UCL) 22 nd Nov 2009 - Powerful Radio Galaxies.](https://reader036.fdocuments.net/reader036/viewer/2022062408/56649ec05503460f94bcc32d/html5/thumbnails/27.jpg)
Questions related to star formation:
• Are all HzRG massive? Does radio luminosity depend on stellar mass (i.e. mass of the central black hole)?
• Are environments of HzRGs with given stellar mass the similar? Can we trace the stellar mass function in (HzRG-selected) over-dense environments?
• What is the present SFR of HzRGs? How is the SFR related to black hole accretion and jet activity?
• What is the future evolution of a HzRG and its proto-cluster?
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“Galaxies' courses will foreshadow certain ends, to which they must lead”
- paraphrasing Charles Dickins