Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Counts Of Submillimeter Galaxies At
High Redshift With Variable IMF
Alejandra MunozProf. Nelson Padilla
June 25, 2009
Cosmology Project 2009Departamento de Astronomıa y Astrofısica
Facultad de FısicaPontificia Universidad Catolica de Chile
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
IMF ξ(m)
I Specifies the relative number of stars formed at each mass
I ξ(m)dm: number of stars that have been born with masses betweenm and m + dm
ξ(m) ∝ m−(α+1)
0.01
0.1
1
10
1 10
ξ(m
/M⊙
)
m/M⊙
SalpeterKennicutt
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
I Dwarf dominated (steeper) or remnant dominated (top-heavy)I (α + 1) = 2.35: SalpeterI (α + 1) = 0.4 (m < 1M¯), (α + 1) = 1.5 (m > 1M¯): Kennicutt
I Galaxy properties that depend on the IMF:I Star formation rate (SFR)I Feedback and metal enrichmentI Rate of luminosity evolution of a simple stellar population (SSP)
IMF dictates the evolution and fate of galaxies and star clusters!!!
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
SMGs
I SCUBA: emission at 850[µm]I Dust-enshrouded starburstsI SFR=659[M¯yr−1]I M=3.5·1011M¯I z ≈ 4− 2
I Source of emission: dustreprocessed emission fromyoung stars, active galacticnuclei (AGN)
Figure: A source of submillimeter radiation, available athttp://www.astronomy.com/asy/objects/images/brightgalaxy 900.jpg
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
An Important Question
Contribution of SMGs to cosmic stellar mass assembly?Counts of submillimeter sources!!!
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
A Previous Work In This Spirit
I Baugh et al. (2005): a modelthat predicts the abundance ofSMGs in the ΛCDMcosmology
I GRASIL codeI Silva et al. (1998)I Uses predicted star
formation and metalenrichment histories
I Output: galaxy spectralenergy distributions (SED)
I A top-heavy IMF in bursts
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Where And How
I Lagos et al. (2008)I Semy-analytic model of galaxy formationI Processes of gas cooling, star formation, feedback from core-collapse
supernovae (SNe CC) explosions and AGN, galaxy mergers, chemicalenrichment of baryons
I Salpeter IMF
I NewI Weidner & Kroupa (2006)I Set of 6 values of α: 1.40 to 2.10, step 0.14I A corresponding SFR and ηCC (number of SNe CC per solar mass)
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Luminosity Functions (LF), Stellar Mass Function (SMF)
-26 -24 -22 -20 -18 -16 -14Mbj - 5log10(h)
10-5
10-4
10-3
10-2
10-1
φ [h
3 /Mpc
3 /mag
] Norberg (2002)
-30 -28 -26 -24 -22 -20 -18MK - 5log10(h)
10-5
10-4
10-3
10-2
10-1
φ [h
3 /Mpc
3 /mag
]
Cole (2001)
Huang (2003)
10-6
10-5
10-4
10-3
10-2
10-1
100
dN/d
log 1
0 M
Ste
llar [
h3 /Mpc
3 dex
-1]
z=4.5
z=2
Drory et al. (2005)
8 9 10 11 12 13log10(MStellar [h
-2 Mo])
10-6
10-5
10-4
10-3
10-2
10-1
100
dN/d
log 1
0 M
Ste
llar [
h3 /Mpc
3 dex
-1]
z=1
8 9 10 11 12 13log10(MStellar [h
-2 Mo])
z=0.5
Drory et al. (2004)
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Mean IMF And Weighted Mean IMF
〈IMF〉 =P
i IMF(gi )Pi gi
〈IMF〉w =P
i 10−MbJ
(gi )IMF(gi )Pi 10
−MbJ(gi )
Requires further revision...
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
I Small changes in the galaxy LFs in the bJ and K bands, and in theSMF at several redshifts
I At high redshifs both mean values of IMF tend to decrease
Still there are situations interesting to analyze...
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Dust And Neighbors
I Connect this model with GRASIL: review implementation of F.Navarrete (2007)
I Number of neighbors a galaxy has within a beam: may change theshape of the predicted counts
I N = nR
cone(1 + Γ(s ′))d3s ′ = 2πn
R r/d
0sin(θ)dθ
R r
0(1 + Γ(s, θ, φ))s2ds
I Γ(r) = (r/r0)−γ two-point correlation function
I γ ' 1.8, r0 ' 5.4h−1 [Mpc]
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
The Challenge
Nature of SMGs is still largely unknown... Decoding their star formationhistories and sources of emission may allow us to learn about our
Universe when this was less than 20% of its current age!!!
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Outline
Initial Mass Function
Submillimeter Galaxies
The Model With Variable IMF
Results
Conclusions And Future Work
References
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
I L. S. Sparke & J. S. Gallagher, Galaxies in the Universe: AnIntroduction, Cambridge University Press, Cambridge, UK (2007).
I P. Schneider, Extragalactic Astronomy and Cosmology, Springer(2006).
I A. Renzini, arXiv:astro-ph/0410295v2.
I C. M. Baugh et al., Mon. Not. R. Astron. Soc. 356 (2005), 1191.
I M. J. Michalowski et al., arXiv:astro-ph.CO/0905.4499v1.
I L. Silva et al., Astrophys. J. 509 (1998) 103.
I G. L. Granato et al., Astrophys. & Space Science 276 (2001), 973.
I C. Weidner & P. Kroupa, Mon. Not. R. Astron. Soc. 365 (2006),1333.
I P. Kroupa, arXiv:astro-ph/0201098v1.
I C. Lagos et al., Mon. Not. R. Astron. Soc. 388 (2008), 587.
I F. Navarrete, Bachelor Practice Report (2007).
I V. J. Martınez & E. Saar, arXiv:astro-ph/0203251v1.
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF
Initial Mass Function Submillimeter Galaxies The Model With Variable IMF Results Conclusions And Future Work References
Thanks.
Figure: Artistic image of a cluster of ”monster galaxies”, available athttp://www.nao.ac.jp/E/Outreach/pr-rl/2009/img/topics090507big.jpg
Alejandra Munoz Prof. Nelson Padilla
Counts Of Submillimeter Galaxies At High Redshift With Variable IMF