The IRSF Magellanic Clouds Point Source Catalog · T-RGB Schematic CMD (J-Ks) vs. Ks Detectable...
Transcript of The IRSF Magellanic Clouds Point Source Catalog · T-RGB Schematic CMD (J-Ks) vs. Ks Detectable...
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The IRSF Magellanic Clouds Point Source Catalog
Daisuke KATONagoya Tokyo
•Near-IR Point Source Catalog for the MCs•A joint program of Nagoya University,
National Astronomical Observatory of Japan,The University of Tokyo,and South African Astronomical Observatory (SAAO)
Contents•Outline of the Catalog•Advantages•Preliminary Results
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MCs surveys at a wide range of wavelengths
X-ray UVMid-farInfrared Radio
Opt.
NIR
ROSAT Zaritsky SpitzerAkari NANTEN ATCA
The MCs have been covered from X-ray to Radio wavelengths
NIR: 2MASS and DENIS cover the whole MCs.
wavelength
Their sensitivities are relatively shallow
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Zaritsky
Comparison of Sensitivity
1010.31
10000
Spitzer
Akari
2MASS
3λ [μm]
DENIS
Optical Near-IR Mid-IR
Too shallowat Near-IR !
30
We have carried out deep NIR survey with IRSF/SIRIUS.
100
5 σ
Sens
itivi
ty [μ
Jy]
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IRSF (InfraRed Survey Facility)• IRSF 1.4 m telescope
+Near-IR camera “SIRIUS”• Developed at SAAO• Simultaneous Imaging at
– J -band (1.25 μm)– H-band (1.63 μm)– Ks-band (2.14 μm)
• FoV: 7 '.7 x 7 '.7• Pixel scale: 0".45 / pix• Exposure time: 300 secObservations were made fromOct. 2001 to Mar. 2006.
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Coverage• 55 deg2 of LMC, SMC,
and a part of the Bridge
HI gas (Putman et al. 1998)
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Coverage
• LMC 40 deg2
(3,249 fields)
• 55 deg2 of LMC, SMC,and a part of the Bridge
IRSF (40 deg2)
Spitzer (50 deg2)Zaritsky (64 deg2)
Akari (10 deg2)
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Coverage
• LMC 40 deg2
(3,249 fields)• SMC 11 deg2
(882 fields)• Bridge 4 deg2
(324 fields)
• Total 55 deg2
(4,455 fields)
• 55 deg2 of LMC, SMC,and a part of the BridgeIRSF (15 deg2)
SpitzerZaritsky (18 deg2)
What are our advantages?
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Zaritsky
IRSF: comparable to Zaritsky, Spitzer, and Akari
Sensitivity
10.31
10000
IRSF
Spitzer
Akari
2MASS
5 σ
Sens
itivi
ty[μ
Jy]
3λ [μm]
DENIS
10 30
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Pre- and post-MS stars can be detected
AGBMS
RGBRed Clump
T-RGB Schematic CMD(J-Ks) vs. Ks
Detectable Objects•dwarfs earlier than B2
• giants later than K2
• AGB stars
• Herbig Ae/Be starswith more than 3Mo
• red clump stars
16.5
14.5
18.5
20.5
Ks
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7 '.7
(=
FoV
of I
RSF
)
2MASS
FWHM: 2".6 FWHM: 1".2
Our higher resolution enables to detect many sources
Nsrc ~ 800 Nsrc ~ 3600
IRSF
Spatial Resolution In a field of the LMC bar
Based on the survey data (~2TB), we constructed a point-source catalog
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Outline of the IRSF catalog
・Source Counts (more than 4σ at least one band)LMC : 14,822,341SMC : 2,769,682Bridge : 434,145Total : 18,026,168
What appear?
• Accuracies–Photometric accuracy: 0.03 - 0.04 mag–Astrometric accuracy: 0.1 arcsec
・10σ limiting magnitudesJ: 18.8 mag, H: 17.8 mag, Ks: 16.6 mag
(cf. 15.7 15.3 14.7 for 2MASS)
・NIR point-source catalog for the LMC, SMC and Bridge
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9
10
11
12
15
16
17
18
Ks
0 1 2J-Ks
CMD(LMC)1,936,123 sources (>10 σ at JHKs)
O 2MASS(Nikolaev & Weinberg 2000)
~2 mag extended to deeper
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CMD(LMC)MS
RGB
AGB
Color-color diagram 0 1 2J-Ks
9
10
11
12
15
16
17
18
Ks
HAeBe
b.g. galaxies
foreground
1,936,123 sources (> 10 σ at JHKs)
FeaturesO Main Sequence O RGBO AGB starsO Galactic foregroundO background galaxies (O HAeBe stars )
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-dwarf-giant-reddening
Populations
H-Ks
J-H
O reddened giants (Av>3)
giantsO O3-B2 dwarfs
Color-color diagram(LMC)
O b.g. galaxies + HAeBe
b.g. galaxies
( O HAeBe stars )
HAeBe
O AGB stars
reddenedgiants
AGB
O Classical Be + HAeBe C Be
O giants
(---) NIR-excess sources
→How about SMC & MB?
1 20OB stars
20
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CMD : LMC, SMC, BridgeLMC SMC Bridge
Bridge:no RGB and AGB features, Galactic foreground is dominant.SMC: similar to LMC
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Color-color Diagram : LMC, SMC, Bridge
Bridge:no RGB and AGB features, Galactic foreground is dominant.SMC: similar to LMC
LMC SMC Bridge
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log 1
0N
Tip of RGB red clump
Luminosity Function (LMC; Ks)
Features by T-RGB and RC
→ undetectable by 2MASS
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LFs
RC, T-RGB:•seen in the
LMC and SMC•not seen in
the Bridge
J
H
Ks
-:LMC-:SMC-:Bridge
108 12 14 16 18 20 [mag]
log 1
0N
log 1
0N
log 1
0N
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Summary“The IRSF Magellanic Clouds Point Source Catalog”
• a NIR point-source catalog for the MCs• covering 55 deg2 of the LMC, the SMC, and the MB• ~2 mag deeper and ~2 times finer than previous surveys• with high photometric and astrometric accuracies
• photometric accuracy: 0.03-0.04 mag• astrometric accuracy: 0.1 arcsec
• including many kinds of populations
Available at web sites ftp://dbc.nao.ac.jp/DBC/ADACnew/ orhttp://pasj.asj.or.jp/v59/n3/590315(PASJ 2007, 59, 615)