The SED of the nearby, HI-massive, LIRG HIZOA J0836-43: from the NIR to the radio domain
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Transcript of The SED of the nearby, HI-massive, LIRG HIZOA J0836-43: from the NIR to the radio domain
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The SED of the nearby, HI-massive, LIRG
HIZOA J0836-43: from the NIR to the radio domain
Renée C. Kraan-KortewegAstronomy Department
Centre for Astrophysics Cosmology and Gravity, UCT
Michelle E. CluverIPAC, CalTech(formerly UCT)
Collaborators:T. Jarrett (IPAC CalTech)
B. Koribalski (ATNF CSIRO)P.N. Appleton (NHSC CalTech)J. Melbourne (IPAC CalTech)
B. Emonts (ATNF CSIRO) SED 2011, Preston5-9 September 2011
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Discovered in deep Parkes MB HI survey of southern ZOA (& HIPASS) • MHI = 7.5 х 1010 M
• Velocity width ~ 600 km/s• Vel = 10689 km/s
(D=148 Mpc)• HI diameter = 130 kpc• SFR 1.4 GHz = 35 M /yr• Not AGN, Starburst?
• Similar to Malin 1 • But not quiescent (0.38M/yr) nor LSB (like most giant HI galaxies)
Donley et al. (2006)
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Credit: Davide De Martin
l,b = 262°.48, -1°.64Av = 7.5 magDIRBE; Schlegel et al (1998)
And behind the Vela SNR
It is optically ~invisible
Observations athigher λ areneeded to learnmore about thisGalaxy
But the galaxy lies in the ZOA; behind thick layer of dust
NIR – environment with IRSF
MIR – imaging & spectroscopy with Spitzer
mm - Mopra
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The galaxy lies in a region underdense in L* galaxies.
This may have allowed its formation and survival, enabling it to evolve in the unusual LIRG
Grey: galaxies in 10Mpc volume around HIZOA
The Environment
NIR (JHK) imaging survey of 2.24 ☐o 404 galaxies; phot-z: quiet low density area
0.03 < z < 0.04
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Various composite images of HIZOA J0836-43
Opt: nearly invisible
NIR: prominent bulge;20cm extended
MIR: extended SF diskSimilar to 20cm
Extended SF also strong in PAHs (6.2,7.7, 11.3)
And [NeII]
All SF indicators extend beyond the old evolved stellar pop. 50kpc SF disk
Cluver et al. ApJ 2010
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Inside-out Disk Building
xxx
Cluver et al. ApJL (2008)
[Ne II] contours SL Spectral Map of
11.3μm PAH
Extended SF disk of about 50kpc
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• resembles Sc-galaxy
• Note:not S0/Sa as from NIR imaging/photometry
• strong MIR emission (5-8μm) but PAH’s
• strong emission from cold dust (λ > 60μm)
• But it does not match starburst (see M82)
Cluver, Jarrett et al. ApJL (2008)
SED of HIZOA J0836-43: NIR, IRAC, MIPS• LTIR = 1.2 ×1011 L Luminous Infrared Galaxy (LIRG)
• SFR = 20.5 M/ yr (Kennicutt 1998)
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Spitzer IRS Spectroscopy (MIR) of nucleusCombined SL (5-14μm) + SH (10-20μm) + LH (19-38μm)
Relatively weak continuum
• Strong excited nebular lines
Typical of SF/SB regions but also of PDR (RN)
• But no [Ne V] & [O IV] AGN absent (or weak)
• Strong PAH Emission extended > nucleus but weak MIR continuum
• weak rotational H2 lines - T ~ 330K
- M = 1.3 × 107 M
Strong PAH emission
Cluver et al. ApJ (2010)
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CO observations using Mopra (2009,2010)
What about cold molecular gas? Observed: very little warm H2-gas
Prediction: from LFIR Mgas= 1.3 x 1010 M
Central pointing, 16.6 hrs, beam 30”; entire disk 1’Most of gas in beam; lower limit for mass estimate
- Rapidly rotating mol disk
- No low velocity gas
- Mcold gas = 3.9 x 109 M
lower than predicted
- M(H2)/M(HI) = 5 %
- fmol gas = 8%
- Gas fraction = 64 %
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• Lots of stars + lots of gas + building
• M* = 4.4×1010 M + MHI = 7.5×1010 M + MH2+He = 3.9 ×109 M
• SFR = 20.5 M/yr & sSFR = 0.47 Gyr-1 • Gas Fraction ~ 64% & Molecular Gas Fraction > 8%
vigorously star-forming extended stellar disk (inside-out) Properties as scaled-up version of local disk galaxies
• (a) How does this compare to other local SF disk galaxies?
• (b) How does this compare to more distant systems?
• (c) Can we say something about the star formation processes, bimodality?
What’s the connection?
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(a) Comparison to SINGS galaxies
(Dale et al. 2009)
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M* = 4.4 x 1010 M
(using Bell et al.; 2003)
- implies young stellar-building phase
- sSFR = 0.47 Gyr-1
- can double stellar mass in 2Gyr
HIZOA J0836-43
(hashed lines indicate SFR of 10, 30, 100M/yr)
(a) Comparison to sample of local LIRG’s (z < 0.1)(Wang et al.; 2006)
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(b) Comparison to higher redshift SF GalaxiesHIZOA J0836-43 is building stellar mass…
→ HIZOA J0836-43 is more similar to the z ~ 0.7 galaxies than local star forming galaxies
Bell et al. (2005)
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SFR = 150(M★/1011)0.8 ([1+z]/3.2)2.7 (Bouché et al. 2010)
The so-called main sequence of SF at a given M★as a f(z)
20.5 M/yr corresponds to z ~ 0.95
(b) Gas-Star Formation relation over Cosmic Time Genzel et al. (2010) for normal SF galaxies (crosses from CO-line emission)
Grey crosses: Noeske et al (2007), Daddi et al. (2007)
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z ~ 0• LIRGs are relatively rare locally (5% of EDIR)
• Local ones: mostly major mergers• HIZOA is coldest LIRG (MIR cont) compared to GOALS
scaled-up galaxy wrt gas mass, SF properties
From z~ 0.1 - 1.0 LIRG;s show little evidences of major merging, mostly minor;
heightened SF because of high gas fraction (e.g. Bell 2005, Melbourne et al 2008, Robaine 2009, … Noorden et al. 2011)
z ~ 1.0 • LIRGs are more common (70% of EDIR)
• Have high gas fraction, hence high SF BUT low SF efficiency similar to scaled-up local disk galaxies
Noorden et al. 2011: ”Larger gas fractions at higher redshift permit larger LIR before invoking special events like mergers and will shift correlations with LIR.
Discussion
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(c) Understanding Star Formation : Gas content SFR Stellar mass
Daddi et al. 2010 ApJL
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Main points: a local LIRG • Rapidly rotating HI and CO (molecular gas) disk
- “large gas reservoir”; is it accreting?
• Old bulge + ‘new’ (forming) stellar disk
- not a major merger
- instead it is a "disk" starburst --> we see clear *inside-out* disk building
- consistent to higher z: larger SFR is due to larger gas reservoirs
• Similarities to *z~1* (gas content, stellar mass, SFR -but not molecular gas fraction)
- study mechanism of "big disk" star formation (inside-out formation)
- at an observationally feasible distance (z~0.036) compared to distant disks at *epoch of peak stellar building*
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The End
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Future Plans•ATCA : long baselines = higher angular resolution
• Distribution and kinematics of HI (and warp)
• Probe interface between H2 and HI
• DONE (Feb 2011)
• Herschel Proposal
Some of the results:- Cluver et al. 2008 ApJL 686, L17 (arXiv:0808.4040)
- Cluver et al. 2010 ApJ 725, 1550 (arXiv: 1010.3550)
- Michelle Cluver at : [email protected]
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Noeske et al. (2007) : • AEGIS galaxies form a “main-sequence” with a limited range of
SFRs at a given Mstellar and z
• MS as a whole moves to higher SFR as z increases• LIRGs at z~1 mostly reflect the high SFR typical for massive
galaxies at that epoch
Daddi et al. (2010):• Two modes of SF : long-lasting for disks vs rapid for starbursts• Difference due to fraction of molecular gas in dense clouds?
• Different αCO for mergers vs non-mergers
(c) Understanding Star Formation : Gas content SFR Stellar mass
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Molecular gas fractions and star formation mechanisms
34% @ z~1.2 (update 45%)44% @ z~2.2 (update 56%)HIZOA (from CO): 3.9 x 109 M 8.8 % (lower limit)
Genzel et al. (2010) Tacconi et al. (2010)
HIZOA lies on the line of actively starforming galaxies, and not on the line of of major merger
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MIR diagnostic diagram (Armus es al. 2007)
Lack of warm dust continuum and strong PAH emission
Peeters et al. (2004)
HIZOAHIZOAMrk 231 ULIRG
N3256S̀B
Arp 220 ULIRG
Resembles Galactic PDR Emission
Similar to GalacticReflexion Neb For λ < 20μm
Indicative of softRadiation field