J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
J. E. Hibbard (NRAO), with:K. Johnson (P.I., UVa), A. Heiderman (NRAO REU), S. Gallagher (UCLA), A. Hornschemeier (GSFC) & J. Charlton (PSU)
Spitzer Observations of Hickson Compact Groups of Galaxies
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Compact Groups: • Hickson 1982
– Richness: N>3 with m<m1+3mag– Isolation: Rneighbor>3Rgroup
– Compactness: G<26 mag/arcsec2
– (selected off of red plates, so bias towards early types)
• May be stage in evolution to cluster core, field early type, “fossil group”, or “dry merger remnants” (c.f. yesterdays talk by Emanuela Pompei)
• Stay tuned to meeting - 6 more CG talks on schedule!
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Spitzer Survey of HCGs: • Kelsey Johnson (UVa) P.I.• IRAC and MIPS imaging of 12 close HCGs
spanning a range of evolutionary states• Use MIR to conduct a complete census of
activity (AGN; star formation) and dust content of HCGs
• This is VERY MUCH a work in progress! (some photometry completed yesterday). See Kelsey’s presentation & Amanda’s poster at January AAS (Washington D.C) for actual results!
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Spitzer IRAC 3.6, 4.5, 5.8, 8 m bands+ MIPS 24m
Radio --->Brent Groves, 2005
Starburst SED ModelsDust
Stars
Spitzer
3.6m 8m 24m
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
3.6 m
5.8 m 8 m
4.5 m
Spitzer IRAC & MIPS Mid-IR Imaging
24 m
Mostly Stars, some PAHs Just Stars
Some Stars, mostly PAHs PAHs
Hot dust
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Nearby galaxies
Virgo
Virgo core
Huchtmeier 1997
So whats a nice radio astronomer like me involved for?
• Compact groups are deficient in HI with respect to field galaxies of the same type
Compact groups
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Verdes-Montenegro et al. 2001
Compact groupsVirgo
Coma Coma I group
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HI Deficiency:
HI properties of 324 isolated galaxies: Haynes & Giovanelli, 1984
DefHI = log[ M(HI:L)pred ] - log[ M(HI:L)obs ](positive for systems more deficient than isolated
galaxies of same type)
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
(L. Verdes-Montenegro, 2001)
• Evaluate evolution of HCGs, especially with respect to their cold gas content and proposed evolutionary scenario
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Can this help us understand “quenching” of star formation in
massive galaxies??
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
In models, continued infall slows color evolution of remnants
(Somerville 2005)
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
SAMs can reproduce observed bimodality by truncating SF when bulge gets above some
critical value
(Somerville 2005)
Mcrit~2x1010 Mo
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Spitzer IRAC 3.6m, 4.5m, 5.0m, 8.0m color images
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
(L. Verdes-Montenegro, 2001)
• Phase 1: HI in individual galaxies. – HCG 02– HCG 61 – HCG 59– HCG 19*– HCG 22*– HCG 07**
*=at least one member HIdef
**=all members HIdef
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 61 (N=3)R-band Halpha
IRAC
Log Lx<41.6
24um
X
Not HI Def
Vilchez & Iglesias-Paramo 1998
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 19 (N=3+2)
IRAC
Optical+HI
No X-ray
24um
X
Optical
AC
B
D
VLA Archive
Not HI Def
*
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 22 (N=3)Optical+HI
X X
Optical
AC
B
DE
IRAC 24um
ATCA Archive, thanks to B. Koribalski
Mulchaey et al. 2003
ROSATA=dSy2
(Log Lx=40.6)
DefHI=0.59
*
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
R-band Halpha
IRAC
IRAC+HI
Log Lx<41.7
24um
HCG 07 (N=4)
VLA Archive
Vilchez & Iglesias-Paramo 1998
DefHI=0.64
**
**
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
(L. Verdes-Montenegro, 2001)
• Phase 2: HI being tidal removed from galaxies. – HCG 31* – HCG 16*
*=at least one member HIdef
**=all members HIdef
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 16 (N=4+2)R-band Halpha
IRAC
Optical+HI
24um XMM
Verdes-Montenegro 2001Vilchez & Iglesias-Paramo 1998
A=LNRB=Sy2
C=SBNG
D=LNR
Log Lx=41.0
DefHI=0.41
***
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 31 (N=4+2)R-band Halpha
IRAC
Optical+HI
Log Lx<41.2
24um
Verdes-Montenegro 2001
DefHI=0.57
*
Vilchez & Iglesias-Paramo 1998
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
(L. Verdes-Montenegro, 2001)
• Phase 4: X-ray medium. no HI in central galaxies; deficient galaxies in the outskirts– HCG 48?– HCG 90**– HCG 62?
?=no HI map**=all members
HIdef
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Optical+HI
Mulchaey et al. 2003
HCG 90 (N=4+1)
ROSAT
IRAC A
CB
D
A=Sy2
D=LNR Log Lx=40.8
DefHI=1.4
*
*
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 42 (N=4)
IRAC
24um
A
C
B
D
Mulchaey et al. 2003
ROSAT
A=dLNR
Log Lx=41.8
E dominated
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 62 (N=4)
IRAC
A
CB
D
Chandra
Log Lx=42.9
E dominated
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
So what can we do with the MIR data?
• SEDs give dominant activity
• Spatially separate SED
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG7C: Def=0.55
HCG7D Def=0.55
HCG7BDef>1.3
HCG7ADef=0.85
Def vs. MIR SEDs
PAHs
PAHs + warm dust
Stars
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Trends with MIR Colors
[4.5]-[8.0] (mag)
[3.6
]-[4
.5]
(mag
)
stars
AGN
PAHs
Blue=not HI DefRed=HI Def
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Trends with MIR-FIR Colors
[4.5]-[8.0] (mag)
[8]-
[24]
(m
ag)
stars
Blue=not HI DefRed=HI Def
hot dust
cool dust
no dust
stars + cool dust
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
MIR and FIR Colors vs. DEF
[4.5]-[8.0] (mag)
[8]-
[24]
(m
ag)
[8]-
[24]
(m
ag)
[4.5]-[8.0] (mag)
[3.6]-[4.5] (mag)
[3.6
]-[4
.5] (
mag
)
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
SFR[24um] vs. Def
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Nuclear vs. Extranuclear MIR SEDs
• HCG 90
Mostly starlight
PAHs & Hot dust
HCG 90DDefHI>2.0
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Conclusions:
• None yet. But track down Kelsey or Amanda Heiderman at January AAS Meeting
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 02 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
IRACOptical+HI HCG 07
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 16 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 19 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 22 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 31 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 42 IRACOptical+HI
Map NotAvailable
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 48 IRACOptical+HI
Map NotAvailable
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 59 IRACOptical+HI
Map NotAvailable
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 61 IRACOptical+HI
Map NotAvailable
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 62 IRACOptical+HI
Map NotAvailable
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
HCG 90 IRACOptical+HI
J. Hibbard ESO Workshop: Groups of Galaxies Dec 5-9 2005
Project Goals
• Optical images of the 12 Hickson Compact Groups (Hickson 1982) in the sample; they were chosen for this study based on distance (closest), angular extent (< 8 arcmin diameter), and membership (at least 3 galaxies with redshifts within 1000 km s-1 of the mean).
• Dotted blue lines enclose the groups with complete Spitzer data to date; the remainder will have a full suite of IRAC and MIPS (24 and 70 m) imaging by the end of Cycle 1.
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