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The IRSF Magellanic Clouds Point Source Catalog
·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

Daisuke KATO
Nagoya Tokyo


MCs surveys at a wide range of wavelengths
ROSAT Zaritsky Spitzer Akari NANTEN ATCA

X-ray

UV

Mid-far Infrared

wavelength Radio

The MCs have been covered from X-ray to Radio wavelengths

NIR: 2MASS and DENIS cover the whole MCs. Their sensitivities are relatively shallow

Opt.

NIR


Comparison of Sensitivity
10000

5 Sensitivity [ Jy]

DENIS

Akari

100

2MASS Too shallow at Near-IR ! Zaritsky Spitzer
1 Near-IR 3 [m]

1

0.3 Optical

Mid-IR 10

30

We have carried out deep NIR survey with IRSF/SIRIUS.


IRSF (InfraRed Survey Facility)
· IRSF 1.4 m telescope +Near-IR camera "SIRIUS" · Developed at SAAO · Simultaneous Imaging at
­ J -band (1.25 m) ­ H-band (1.63 m) ­ Ks-band (2.14 m)

· FoV: 7 '.7 x 7 '.7 · Pixel scale: 0".45 / pix · Exposure time: 300 sec Observations were made from Oct. 2001 to Mar. 2006.


Coverage
· 55 deg2 of LMC, SMC, and a part of the Bridge

HI gas (Putman et al. 1998)


Coverage
· 55 deg2 of LMC, SMC, and a part of the Bridge · LMC 40 deg2 (3,249 fields)

IRSF Zaritsky Spitzer Akari

(40 (64 (50 (10

deg2) deg2) deg2) deg2)


Coverage
IRSF (15 deg2) Spitzer Zaritsky (18 deg2) · 55 deg2 of LMC, SMC, and a part of the Bridge · LMC · SMC 40 deg2 (3,249 fields)

11 deg2 (882 fields) · Bridge 4 deg2 (324 fields) · Total 55 deg2 (4,455 fields)

What are our advantages?


Sensitivity
10000

[ Jy]

DENIS

Akari

5 Sensitivity

2MASS

IRSF Zaritsky
1 0.3 1 3 [m]

Spitzer
10 30

IRSF: comparable to Zaritsky, Spitzer, and Akari


Pre- and post-MS stars can be detected
Ks
14.5 16.5 18.5 20.5

MS

AGB

T-RGB

Schematic CMD (J-Ks) vs. Ks Detectable Objects
·dwarfs earlier than B2

Red Clump RGB

· giants later than K2 · AGB stars · Herbig Ae/Be stars with more than 3Mo · red clump stars


Spatial Resolution
2MASS 7 '.7 (= FoV of IRSF)

In a field of the LMC bar

IRSF

FWHM:

2".6 Nsrc ~ 800

1".2 Nsrc ~ 3600

FWHM:

Our higher resolution enables to detect many sources
Based on the survey data (~2TB), we constructed a point-source catalog


Outline of the IRSF catalog
NIR point-source catalog for the LMC, SMC and Bridge Source Counts (more than 4 at least one band)
LMC SMC Bridge Total : 14,822,341 : 2,769,682 : 434,145 18,026,168

10 limiting magnitudes J: 18.8 mag, H: 17.8 mag, Ks: 16.6 mag
(cf. 15.7 15.3 14.7 for 2MASS)

· Accuracies
­Photometric accuracy 0.03 - 0.04 mag ­Astrometric accuracy 0.1 arcsec

What appear?


1,936,123 sources (>10 at JHKs)
9 10 11 12

CMDLMC

Ks
15 16 17 18 0 J-Ks 1 2

O 2MASS
Nikolaev & Weinberg 2000

~2 mag extended to deeper


1,936,123 sources (> 10 at JHKs)
9 10 11 12

AGB MS
foreground

CMDLMC

RGB
15 16 17 18 0

Features O Main Sequence O RGB O AGB stars O Galactic foreground O background galaxies (O HAeBe stars )

Ks

HAeBe b.g. galaxies
J-Ks 1 2

Color-color diagram


Color-color diagram LMC Populations
J-H 2 O giants O AGB stars

reddened giants giants

O O3-B2 dwarfs O reddened giants (Av>3) (--O O (O ) NIR-excess b.g. galaxies Classical Be HAeBe stars sources + HAeBe + HAeBe )

AGB
b.g. galaxies dwarf HAeBe giant reddening C Be

0

OB stars

0

1 H-Ks 2

How about SMC & MB?


CMD : LMC, SMC, Bridge
LMC SMC Bridge

SMC similar to LMC Bridgeno RGB and AGB features, Galactic foreground is dominant.


Color-color Diagram : LMC, SMC, Bridge
LMC SMC Bridge

SMC similar to LMC Bridgeno RGB and AGB features, Galactic foreground is dominant.


Luminosity Function (LMC; Ks)
undetectable by 2MASS

log10 N

Tip of RGB

red clump

Features by T-RGB and RC


J
log10 N

LFs
LMC SMC Bridge RC, T-RGB: ·seen in the LMC and SMC ·not seen in the Bridge

H
log10 N

Ks
log10 N 8

10

12

14

16

18

20 [mag]


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/ or
(PASJ 2007, 59, 615) http://pasj.asj.or.jp/v59/n3/590315