J/PASP/122/683 SAGE-Spec Spitzer legacy program (Kemper+, 2010)
The SAGE-spec Spitzer Legacy program:
the life cycle of dust and gas in the Large Magellanic cloud.
Kemper F., Woods P.M., Antoniou V., Bernard J.-P., Blum R.D., Boyer M.L.,
Chan J., Chen C.-H.R., Cohen M., Dijkstra C., Engelbracht C., Galametz M.,
Galliano F., Gielen C., Gordon K.D., Gorjian V., Harris J., Hony S.,
Hora J.L., Indebetouw R., Jones O., Kawamura A., Lagadec E., Lawton B.,
Leisenring J.M., Madden S.C., Marengo M., Matsuura M., McDonald I.,
McGuire C., Meixner M., Mulia A.J., O'Halloran B., Oliveira J.M.,
Paladini R., Paradis D., Reach W.T., Rubin D., Sandstrom K., Sargent B.A.,
Sewilo M., Shiao B., Sloan G.C., Speck A.K., Srinivasan S., Szczerba R.,
Tielens A.G.G.M., van Aarle E., van Dyk S.D., van Loon J.T.,
Van Winckel H., Vijh U.P., Volk K., Whitney B.A., Wilkins A.N.,
Zijlstra A.A.
<Publ. Astron. Soc. Pac., 122, 683-700 (2010)>
=2010PASP..122..683K 2010PASP..122..683K (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Interstellar medium
Abstract:
The SAGE-Spec Spitzer Legacy program is a spectroscopic follow-up to
the SAGE-LMC photometric survey of the Large Magellanic Cloud carried
out with the Spitzer Space Telescope. We present an overview of
SAGE-Spec and some of its first results. The SAGE-Spec program aims to
study the life cycle of gas and dust in the Large Magellanic Cloud and
to provide information essential to the classification of the point
sources observed in the earlier SAGE-LMC photometric survey. We
acquired 224.6h of observations using the infrared spectrograph and
the spectral energy distribution (SED) mode of the Multiband Imaging
Photometer for Spitzer. The SAGE-Spec data, along with archival
Spitzer spectroscopy of objects in the Large Magellanic Cloud, are
reduced and delivered to the community. We discuss the observing
strategy, the specific data-reduction pipelines applied, and the
dissemination of data products to the scientific community. Initial
science results include the first detection of an extragalactic 21um
feature toward an evolved star and elucidation of the nature of disks
around RV Tauri stars in the Large Magellanic Cloud. Toward some young
stars, ice features are observed in absorption. We also
serendipitously observed a background quasar, at a redshift of
z≈0.14, which appears to be hostless.
Description:
The Spitzer SAGE-Spec program (PID: 40159) consists of 224.6hr of
spectroscopic observations of targets in the LMC. The targets included
point sources and extended regions, both of which were observed using
the IRS low-resolution and MIPS SED modes. Observations were done in
the IRS staring mode for 196 point sources, and 48 point sources were
observed in MIPS SED mode. In addition, 10 extended regions were
mapped in both the MIPS SED and IRS observing modes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 64 894 Archival IRS staring mode observations within
the SAGE-LMC footprint
table3.dat 119 197 Point sources targeted with the IRS staring mode
as part of the SAGE-Spec program
table4.dat 52 197 Point sources targeted with the IRS staring mode
as part of the SAGE-Spec program, Part II
table6.dat 61 23 Positions and map sizes of extended region
observations in the SAGE-Spec program
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See also:
II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)
J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)
J/AJ/135/726 : Spitzer SAGE observations of LMC PNe (Hora+, 2008)
J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008)
http://data.spitzer.caltech.edu/popular/sage-spec/ : SAGE-SPEC files
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- AOR AOR Key
10- 11 I2 h RAh IRS right ascension (J2000) requested
13- 14 I2 min RAm IRS right ascension (J2000) requested
16- 20 F5.2 s RAs IRS right ascension (J2000) requested
22 A1 --- DE- IRS declination sign (J2000) requested
23- 24 I2 deg DEd IRS declination (J2000) requested
26- 27 I2 arcmin DEm IRS declination (J2000) requested
29- 33 F5.2 arcsec DEs IRS declination (J2000) requested
35- 40 I6 --- PropID Proposal ID
43- 54 A12 --- PI PI name
57- 64 I8 --- AORMIPS ? Key MIPS SED
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/197]+ Sequential number
5- 12 I8 --- AOR AOR Key
14- 15 I2 h RAh IRS right ascension (J2000)
17- 18 I2 min RAm IRS right ascension (J2000)
20- 24 F5.2 s RAs IRS right ascension (J2000)
26 A1 --- DE- IRS declination sign (J2000)
27- 28 I2 deg DEd IRS declination (J2000)
30- 31 I2 arcmin DEm IRS declination (J2000)
33- 37 F5.2 arcsec DEs IRS declination (J2000)
39- 46 A8 --- --- [SSTISAGE]
47- 68 A22 --- SSTISAGE SAGE designation, [M12]C JHHMMSS.ss+DDMMSS.s
70- 75 A6 --- Module Modules (SL, LL)
78-102 A25 --- Name Other name
103-110 I8 --- AORMIPS ? AOR Key MIPS SED
113-119 A7 --- Rem Remarks
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/197]+ Sequential number
5- 9 F5.2 mag Jmag ?=- 2MASS J magnitude
11- 15 F5.2 mag Hmag ?=- 2MASS H magnitude
17- 21 F5.2 mag Kmag ?=- 2MASS Ks magnitude
23- 27 F5.2 mag [3.6] ?=- Spitzer/IRAC 3.6um magnitude
29- 33 F5.2 mag [4.5] ?=- Spitzer/IRAC 4.5um magnitude
35- 39 F5.2 mag [5.8] ?=- Spitzer/IRAC 5.8um magnitude
41- 45 F5.2 mag [8.0] ?=- Spitzer/IRAC 8.0um magnitude
47- 51 F5.2 mag [24] ?=- Spitzer/MIPS 24um magnitude
52 A1 --- n_[24] Note on [24] (1)
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Note (1): MIPS-[24] from nearby LHa 120-N 82, which appears to be the main
contributor to the LL spectrum.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Reg Region
11 A1 --- n_Reg [abc] Note on Region (1)
13- 20 I8 --- AOR ?=- AOR Key IRS
22- 29 I8 --- AORMIPS ?=- AOR Key MIPS SED
31- 32 I2 h RAh ? Right ascension (J2000)
34- 35 I2 min RAm ? Right ascension (J2000)
37- 41 F5.2 s RAs ? Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd ? Declination (J2000)
47- 48 I2 arcmin DEm ? Declination (J2000)
50- 54 F5.2 arcsec DEs ? Declination (J2000)
55- 57 F3.1 arcmin Size1 Map size
58 A1 --- --- [x]
59- 61 F3.1 arcmin Size2 Map size
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Note (1): Notes as follows:
a = SSDR, SAGE-Spec diffuse region
b = Nomenclature according to the catalog by Davies et al.
(1976, Cat. VII/232)
c = This region is covered by a set of 14 IRS and 2 MIPS SED AORs,
all part of Spitzer PID 30653 (Indebetouw et al., 2009ApJ...694...84I 2009ApJ...694...84I)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Dec-2010