Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/701/508      5000 AGNs behind the Magellanic clouds     (Kozlowski+, 2009)

Discovery of 5000 active galactic nuclei behind the Magellanic Clouds. Kozlowski S., Kochanek C.S. <Astrophys. J., 701, 508-513 (2009)> =2009ApJ...701..508K
ADC_Keywords: Active gal. nuclei ; Photometry, infrared ; Magellanic Clouds Keywords: cosmology: observations - galaxies: active - infrared: galaxies - quasars: general Abstract: We show that using mid-IR color selection to find active galactic nuclei (AGNs) is as effective in dense stellar fields such as the Magellanic Clouds as it is in extragalactic fields with low stellar densities using comparisons between the Spitzer Deep Wide Field Survey data for the NOAO Deep Wide Field Survey Bootes region and the SAGE Survey of the Large Magellanic Cloud. We use this to build high-purity catalogs of ∼5000 AGN candidates behind the Magellanic Clouds. Once confirmed, these quasars will expand the available astrometric reference sources for the Clouds and the numbers of quasars with densely sampled, long-term (>decade) monitoring light curves by well over an order of magnitude and potentially identify sufficiently bright quasars for absorption line studies of the interstellar medium of the Clouds. Description: We combine results from studies of the extragalactic NOAO Deep Wide Field Survey (NDWFS; Jannuzi & Dey, 1999ASPC..191..111J) Bootes field based on the IRAC Shallow Survey (Eisenhardt et al. 2004ApJS..154...48E), the Spitzer Deep Wide Field Survey (SDWFS; Ashby et al. 2009, Cat J/ApJ/701/428), and the AGN and Galaxy Evolution Survey (AGES; C. S. Kochanek et al. 2009, in prep) with the Spitzer SAGE Survey data (Meixner et al. 2006, Cat. J/AJ/132/2268) and OGLE-III optical survey (Udalski et al. 2008AcA....58...69U, 2008AcA....58...89U, 2008AcA....58..329U) of the LMC to develop a simple method of selecting AGNs in these dense stellar fields. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 176 4699 AGN candidates behind the Large Magellanic Cloud table2.dat 176 657 AGN candidates behind the Small Magellanic Cloud
See also: J/ApJ/716/530 : Mid-IR variability from the SDWFS (Kozlowski+, 2010) J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009) J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008) J/ApJ/655/212 : S3MC IRAC and MIPS photometry (Bolatto+, 2007) J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006) J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006) J/A+AS/142/41 : SMC X-ray sources ROSAT PSPC catalogue (Haberl+, 2000) J/A+AS/139/277 : LMC X-ray sources ROSAT PSPC catalogue (Haberl+, 1999) http://celestial.berkeley.edu/spitzer : S3MC (Spitzer Survey of the SMC) page http://irsa.ipac.caltech.edu/data/SPITZER/SAGE/ : SAGE data access http://irsa.ipac.caltech.edu/data/SPITZER/SDWFS/ : SDWFS data access Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 20 A20 --- ID Source identification (JHHMMSS.ss+DDMMSS.s) (see Nomenclature notes) 22- 30 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 32- 41 F10.6 deg DEdeg Declination in decimal degrees (J2000) 43- 48 F6.3 mag [3.6] ?=99.999 Spitzer/IRAC 3.6 micron band magnitude 50- 54 F5.3 mag e_[3.6] ?=9.999 The 1σ error in 3.6mag 56- 61 F6.3 mag [4.5] ?=99.999 Spitzer/IRAC 4.5 micron band magnitude 63- 67 F5.3 mag e_[4.5] ?=9.999 The 1σ error in 4.5mag 69- 74 F6.3 mag [5.8] ?=99.999 Spitzer/IRAC 5.8 micron band magnitude 76- 80 F5.3 mag e_[5.8] ?=9.999 The 1σ error in 5.8mag 82- 87 F6.3 mag [8.0] ?=99.999 Spitzer/IRAC 8.0 micron band magnitude 89- 93 F5.3 mag e_[8.0] ?=9.999 The 1σ error in 8.0mag 95-100 F6.3 mag Vmag ?=99.999 V band magnitude 102-106 F5.3 mag e_Vmag ?=9.999 The 1σ error in Vmag 108-113 F6.3 mag Imag ?=99.999 I band magnitude 115-119 F5.3 mag e_Imag ?=9.999 The 1σ error in Imag 121-135 A15 --- OGLE OGLE-III identification (smc/lmcFFF.F.NNNNNN; <OGLE {L/S}MCFFF.F NNNNNN> in Simbad) 137-142 A6 --- Type Source type, from color-magnitude diagrams (1) 144-148 F5.2 --- z ?=-1 Redshift 150-176 A27 --- r_z Reference of z (2)
Note (1): The classification scheme is QSO-[AB][0ab] or YSO-[AB][0ab] according to the location in color-magnitude diagrams: A and B for IRAC colors/magnitudes, a and b with the I color from OGLE-III; 0 means that the source had no optical match (outside the OGLE-III regions or too faint). See section 2 of the paper for details. Note (2): In table 1, we indicate if the source is a known quasar if it is flagged as a "YSO" by Whitney et al. (2008, Cat. J/AJ/136/18), and if it is within the 90% confidence radius of a ROSAT source ("HP99", Haberl & Pietsch 1999, Cat. J/A+AS/139/277; <[HP99] NNNN> in Simbad). We estimate that 30% of the ROSAT identifications will be false positives. For the ROSAT sources we indicate the ROSAT catalog number using the format HP99_number. In table 2, if it is flagged as a "YSO" by Bolatto et al. (2007, Cat. J/ApJ/655/212) and if it is within the 90% confidence radius of a ROSAT source (H00, Haberl et al. 2000, Cat. J/A+AS/142/41; <[HFP2000] NNN> in Simbad). For the ROSAT sources we indicate the ROSAT catalog number using format H00_number. A "-1" indicates no existing reference.
Nomenclature notes: For table 1, sources are <[KK2009] SAGE JHHMMSS.ss+DDMMSS.s> and for table 2, sources are <SSTS3MC DD.dddd+DD.dddd> with truncated coordinates. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Sep-2011
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

catalogue service

© UDS/CNRS

Contact