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J/AJ/135/726          Spitzer SAGE observations of LMC PNe         (Hora+, 2008)

Spitzer SAGE observations of Large Magellanic Cloud planetary nebulae. Hora J.L., Cohen M., Ellis R.G., Meixner M., Blum R.D., Latter W.B., Whitney B.A., Meade M.R., Babler B.L., Indebetouw R., Gordon K., Engelbracht C.W., For B.-Q., Block M., Misselt K., Vijh U., Leitherer C. <Astron. J., 135, 726-736 (2008)> =2008AJ....135..726H
ADC_Keywords: Planetary nebulae ; Magellanic Clouds ; Photometry, infrared ; Cross identifications Mission_Name: Spitzer Keywords: infrared: stars - Magellanic Clouds - planetary nebulae: general - stars: mass loss Abstract: We present IRAC and MIPS images and photometry of a sample of previously known planetary nebulae (PNe) from the Surveying the Agents of a Galaxy's Evolution (SAGE) survey of the Large Magellanic Cloud (LMC) performed with the Spitzer Space Telescope. Of the 233 known PNe in the survey field, 185 objects were detected in at least two of the IRAC bands, and 161 detected in the MIPS 24um images. Color-color and color-magnitude diagrams are presented using several combinations of IRAC, MIPS, and Two Micron All Sky Survey magnitudes. The location of an individual PN in the color-color diagrams is seen to depend on the relative contributions of the spectral components which include molecular hydrogen, polycyclic aromatic hydrocarbons (PAHs), infrared forbidden line emission from the ionized gas, warm dust continuum, and emission directly from the central star. The sample of LMC PNe is compared to a number of Galactic PNe and found not to significantly differ in their position in color-color space. We also explore the potential value of IR PNe luminosity functions (LFs) in the LMC. IRAC LFs appear to follow the same functional form as the well-established [OIII] LFs although there are several PNe with observed IR magnitudes brighter than the cut-offs in these LFs. Description: Observations were obtained as part of the SAGE survey of the LMC (Meixner et al. 2006, Cat. J/AJ/132/2268): imaging survey of the Large Magellanic Cloud (LMC; ∼7°x7°) using the IRAC (3.6, 4.5, 5.8, and 8um) and MIPS (24, 70, and 160um) instruments on board the Spitzer Space Telescope during two epochs in 2005. The photometry was obtained from IRAC and MIPS images of the LMC that were obtained as part of the Spitzer SAGE legacy survey. Mosaics were constructed using all epochs of SAGE data for positions around the known PNe candidates from Leisy et al. (1997, Cat. J/A+AS/121/407), and photometry extracted for those sources that were detected. For the 2MASS and MIPS 70 and 160 micron bands, the expected fluxes of most of the objects are below the flux limit of the survey and are undetected. In other cases, the sources might have been detected except for confusion with other sources in the field or higher background due to extended emission in star-forming regions, for example, which will affect the statistics in those bands. The table gives the Spitzer source position and distance from the Leisy et al. (1997, Cat. J/A+AS/121/407) position. The magnitudes in each of the Spitzer bands are given (when detected), and the characteristics of the source and field near the nebula are indicated in the last column. The 5 sigma point source sensitivity limits are 17.2, 16.2, 15.6, 19.3, 18.5, 16.1, 15.4, 10.4, 3.5, and -0.6mag for the 2MASS J, H, K, IRAC 3.6 micron, 4.5 micron, 5.8 micron, 8.0 micron, and MIPS 24 micron, 70 micron, and 160 micron bands, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 111 213 SAGE LMC Planetary Nebulae Photometry
See also: J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006) J/A+AS/121/407 : LMC planetary nebulae positions (Leisy+ 1997) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- LMC Running identification number (<[HCE2008] NNN> in Simbad) 5 A1 --- f_LMC [d] Flag for LMC 92 (1) 7- 10 F4.2 arcsec Dist Distance from catalog position (2) 12 I1 h RAh Hour of Right Ascension (J2000) 14- 15 I2 min RAm Minute of Right Ascension (J2000) 17- 20 F4.1 s RAs Second of Right Ascension (J2000) 22 A1 --- DE- Sign of the Declination (J2000) 23- 24 I2 deg DEd Degree of Declination (J2000) 26- 27 I2 arcmin DEm Arcminute of Declination (J2000) 29- 32 F4.1 arcsec DEs Arcsecond of Declination (J2000) 34- 38 F5.2 mag 3.6mag ? IRAC 3.6 micron band magnitude 40- 43 F4.2 mag e_3.6mag ? Uncertainty in 3.6mag 45- 49 F5.2 mag 4.5mag ? IRAC 4.5 micron band magnitude 51- 54 F4.2 mag e_4.5mag ? Uncertainty in 5.8mag 56- 60 F5.2 mag 5.8mag ? IRAC 5.8 micron band magnitude 62- 65 F4.2 mag e_5.8mag ? Uncertainty in 5.8mag 67- 71 F5.2 mag 8.0mag ? IRAC 8.0 micron band magnitude 73- 76 F4.2 mag e_8.0mag ? Uncertainty in 8.0mag 78- 82 F5.2 mag 24mag ? MIPS 24 micron band magnitude 84- 87 F4.2 mag e_24mag ? Uncertainty in 24mag 89- 92 F4.2 mag 70mag ? MIPS 70 micron band magnitude 94- 97 F4.2 mag e_70mag ? Uncertainty in 70mag 99-103 A5 --- OName Other name (3) 105-111 A7 --- Code Source characteristics near the nebula (4)
Note (1): d = Because it is extended in the IRAC images, the photometry for LMC 92 (SMP 93) was performed by summing the flux above the background in a 25.62x17.08 box centered on the core. Note (2): Distance between the position determined from the 3.6 micron photometry and the Leisy et al. (1997, Cat. J/A+AS/121/407) catalog position. Note (3): The source identifications given by Leisy et al. (1997, Cat. J/A+AS/121/407) for the objects in their catalog. Abbreviations as follows: J = Jacoby (1980ApJS...42....1J, <Jacoby LMC NN> in Simbad) MG = Morgan & Good (1992A&AS...92..571M, <MGPN LMC NN> in Simbad) Mo = Morgan (1994A&AS..103..235M, <[M94b] NN> in Simbad) Sa = Sanduleak (1984, Structure and Evolution of the Magellanic Clouds, ed. van den Bergh, S. & de Boer, K. S. (Paris: IAU), 231, <SMP LMC NNN> in Simbad) SMP = Sanduleak et al. (1978PASP...90..621S, <SMP LMC NNN> in Simbad) Note (4): The letters represent the characteristics of the source and field near the nebula in each band (in wavelength order from 3.6 to 24um). Codes as follows: A = well defined, isolated point source B = blended with other nearby point source C = complex background or distribution of many nearby point sources E = extended source N = no source visible or too faint to determine whether extended or pointlike
History: From electronic version of the journal and from Joseph L. Hora, jhora(at), Harvard-Smithsonian CfA
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 21-Jun-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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