ultra-luminous infrared galaxies at high redshift - the spitzer perspective e. le floc’h (steward...
Post on 15-Jan-2016
218 views
TRANSCRIPT
![Page 1: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/1.jpg)
Ultra-Luminous Infrared Galaxiesat high redshift - The Spitzer
perspective
E. Le Floc’h (Steward Observatory, University of Arizona)
* Spitzer-NDWFS : A.Dey, K.Brand, B.Jannuzi (NOAO), V.Desai, T.Soifer, L.Armus, C.Borys (Caltech), S.Higdon, J.Higdon, D.Weedman (Cornell), K.Tyler (Arizona)
* MIPS team : C.Papovich, G.Rieke (Arizona), H.Dole (IAS-Orsay)
Galaxies and Structures through Cosmic Times, March 29th, 2006
•* DEEP : C.Willmer, K.Noeske, D.Koo, E.Laird, P.Nandra, N.Konidaris,• J.Lotz, A.Coil, C.Conselice, P.Barmby, M.Ashby, R.Ivison, …
+ R.Gilli, R.Maiolino, E.Bell, V.Charmandaris, D.Elbaz, ….
![Page 2: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/2.jpg)
IRAS and the ULIRGs at low redshift
( Mirabel et al. 1991)
InfraredUV
(visible)
.
(Sanders & Mirabel 1996)
(Sanders & Mirabel 1996)
(Adapt. Devriendt et al. 1999)
ULIRGs:
- L(8-1000 m) > 1012 L
- only a few % of the IR energy density in the local Universe
Galaxies and Structures through Cosmic Times, March 29th, 2006
ULIRGs
Spirals
![Page 3: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/3.jpg)
Infrared luminosity functions
Local IRAS LF
Galaxies and Structures through Cosmic Times, March 29th, 2006
Faint-end slope constrained from the deep source counts in GOODS-N as well as stacking analysis with COMBO-17 (Zheng et al. 2005)
1000x !
< 10
LF05
![Page 4: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/4.jpg)
ULIRG evolution with redshift
1<z<3
Galaxies and Structures through Cosmic Times, March 29th, 2006
LF05
?( © Hughes et al.)
SCUBA
![Page 5: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/5.jpg)
Spitzer ULIRGs at z>1
- «template» selection : e.g., Le Floc’h et al. 04, Lonsdale et al. 04, Rowan-Robinson et al. 05
- LBGs : e.g., Huang et al. 05
- DRGs : e.g., Papovich et al. 06
- BzKs : e.g., Daddi et al. 05 (also X.Kong’s talk)
ULIRGs
… no single approach with a uniform selection. Which connection between these populations ?
(Papovich et al. 2006)
Galaxies and Structures through Cosmic Times, March 29th, 2006
DRGs
![Page 6: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/6.jpg)
Galaxies and Structures through Cosmic Times, March 29th, 2006
R-24 selection of z>2 ULIRGs
Bootes
CDFS
> 0.3 mJy
> 0.08 mJy
- F24m > ~1mJy- R > ~24-25 mag
(extreme IR/opt ratios)
IRS spectra : 2<z<3
coeval to the SCUBA sources
but 5-10x brighter in the mid-IR
(Houck et al. 2005, Yan et al. 2005, Weedman et al. 2006)
(deep)
(shallow)
R - 24m > 15
![Page 7: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/7.jpg)
Galaxies and Structures through Cosmic Times, March 29th, 2006
AGNs or starbursts ?
Starburst
4 6 8 10 12 14 16
- also lots of feature-less power-laws (no redshift)
- in most cases : features from Si
- rarer but still detected : PAHs
Bias toward AGNs / warm sources
(Brand et al. 2006)
Starbursts
* AGNs* X-ray sources* > 1mJy pop.
Wavelength (micron)
AGN
![Page 8: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/8.jpg)
Galaxies and Structures through Cosmic Times, March 29th, 2006
AGNs or starbursts ?
ColdWarm
(Chapman et al. 2005)
MIPS SCUBA
(2004)
![Page 9: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/9.jpg)
Galaxies and Structures through Cosmic Times, March 29th, 2006
Far-IR properties of z>2 ULIRGs
- 70m and 160m stacking at the
positions of the 24m-selected ULIRGs (K.Tyler et al.)
- Spitzer GO2 : deep imaging at
70m and 160m
70m24m 160m
Z=2.46
(Borys et al. 06, Desai et al. 06)
Starburst-dominated HyLIRG
Z=1.3
![Page 10: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/10.jpg)
CXO-J141741.9+522823
, LX ~ 2x1044 erg/s- NH ~ 1022 cm-2
- 6 mJy @ 24 m
z = 1.15
Galaxies and Structures through Cosmic Times, March 29th, 2006
- mid-IR spectrum : no Si absorption, very weak PAHs, …
![Page 11: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/11.jpg)
(Page et al. 01, Alexander et al. 05…)
Coeval growth buldge / SM-BH
Galaxies and Structures through Cosmic Times, March 29th, 2006
- Lbol ~ 9x1012 L
- 50% cold, 50% warm, …
- 20% emitted
below 8m
Esbt ~ EAGN
CXO-J141741.9+522823
H He ~ 0.7%Acc. ~ 10%
-
-
Esbt ~ 5 x EAGN to satisfy theMagorrian relation *if* Tsbt = TAGN
![Page 12: Ultra-Luminous Infrared Galaxies at high redshift - The Spitzer perspective E. Le Floc’h (Steward Observatory, University of Arizona) * Spitzer-NDWFS :](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649d5d5503460f94a3bc83/html5/thumbnails/12.jpg)
Galaxies and Structures through Cosmic Times, March 29th, 2006
Summary
* ULIRGs at 0<z<1 : increasing contribution to the IR energy density, reaching ~10% at z~1* ULIRGs at z>1 : not a uniform selection yet
* Connection between SCUBA- and optical/near-IR selections still to be addressed
* A « new » population selected with extreme IR/opt. ratios and located at 2<z<3
- AGN-dominated in the mid-IR, but evidence for starburst emission in the FIR•- Might witness the coeval growth of stellar buldges• and SM black holes, but with different time scales