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J/MNRAS/405/2505    Nuclear activity in ULIRGs               (Nardini+, 2010)

The role of nuclear activity as the power source of ultraluminous infrared galaxies. Nardini E., Risaliti G., Watabe Y., Salvati M., Sani E. <Mon. Not. R. Astron. Soc., 405, 2505-2520 (2010)> =2010MNRAS.405.2505N
ADC_Keywords: Active gal. nuclei ; Galaxies, IR Keywords: galaxies: active - galaxies: starburst - infrared: galaxies Abstract: We present the results of a 5-8um spectral analysis performed on the largest sample of local ultraluminous infrared galaxies (ULIRGs) selected so far, consisting of 164 objects up to a redshift of ∼0.35. The unprecedented sensitivity of the Infrared Spectrograph onboard Spitzer allowed us to develop an effective diagnostic method to quantify the active galactic nucleus (AGN) and starburst (SB) contribution to this class of objects. The large AGN over SB brightness ratio at 5-8um and the sharp difference between the spectral properties of AGN and SB galaxies in this wavelength range make it possible to detect even faint or obscured nuclear activity, and disentangle its emission from that of star formation. By defining a simple model we are also able to estimate the intrinsic bolometric corrections for both the AGN and SB components, and obtain the relative AGN/SB contribution to the total luminosity of each source. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 164 General properties and spectral parameters of our local ULIRG sample table3.dat 104 52 Properties of the 52 high-redshift sources in the control sample pid.dat 79 26 Spitzer programme numbers refs.dat 69 36 References
See also: J/AJ/121/97 : K-band spectroscopy of ULIRGs (Murphy+, 2001) J/A+A/409/115 : VLA imaging of IRAS 1 Jy ULIRG sample (Nagar+, 2003) J/AJ/131/1942 : 2MASS observations of IRAS 1Jy ULIRGs (Chen+, 2006) J/ApJ/640/167 : AGNs and ULIRGs in the CDF-South (Alonso-Herrero+, 2006) J/A+A/467/565 : z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007) J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z∼2 ULIRGs (Yan+, 2007) J/MNRAS/375/115 : ULIRGs galaxies in SDSS, 2dF and 6dF (Hwang+, 2007) J/ApJ/674/172 : Oxygen abundances of LIRGs and ULIRGs (Rupke+, 2008) J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM, B1950) 12- 16 F5.3 --- z Redshift 18- 22 F5.2 [Lsun] Lir IR luminosity (log scale) 24- 27 F4.2 [Lsun] e_Lir rms uncertainty on logLir 29- 32 F4.1 % Abol ?=- AGN contribution to the bolometric flux 34 A1 --- l_Abol1 Limit flag on DAbol (1) 35- 39 F5.2 % Abol1 1-σ confidence range in Abol (lower limit) 40 A1 --- --- [-] 41- 45 F5.2 % Abol2 ? 1-σsigma confidence range for Abol (upper limit) 46 A1 --- l_tau Limit flag on tau 47- 50 F4.2 --- tau ?=- AGN optical depth τ 52- 56 I5 --- PID Spitzer programme number, in pid.dat file 58- 62 A5 --- Type Morphological type (LINER, H II, Sy1 or Sy2) 64 A1 --- Cl [CL-] Optical class (Compact/Loose) 66- 70 A5 --- Ref References for optical and morphological type, in refs.dat file 71 A1 --- Note [*] * indicates an individual note (2)
Note (1): Whenever the confidence range is provided as an upper limit, the AGN detection is not considered as confident, with the exceptions of 00482-2720, 09463+8141, 11223-1244, 12359-0725, 16541+5301 and 20087-0308. Note (2): Additional notes: In the following cases the best fit has been obtained by allowing the AGN intrinsic slope to assume the value shown in brackets, instead of the template 1.5: 00182-7112(0.43), 00188-0856(0.78), 01572+0009(0.96), 07598+6508(0.58), 09320+6134(1.02), 11119+3257(0.47), 12127-1412(1.31), 12514+1027(1.00), 14026+4341(1.17), 19254-7245(0.52), 20037-1547(0.79), 23498+2423(0.31), 23515-2917(0.42). Comparable minima in the parameter space suggest the presence of a faint AGN in 02411+0354, while 14197+0812, 18531-4616 and 23365+3604 can be SB dominated.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 26 A26 --- Name Object name 27 A1 --- n_Name [a-e] Group of intrinsic slope (1) 29- 32 F4.2 --- z Redshift 34- 38 F5.2 Gpc DL Luminosity distance 41- 44 F4.1 % Abol ?=- AGN contribution to bolometric flux 46 A1 --- l_Abol1 Limit flag on Abol 47- 50 F4.1 % Abol1 1-σ confidence range for Abol (lower limit) 51 A1 --- --- [-] 52- 55 F4.1 % Abol2 ? 1-σ confidence range for Abol (upper limit) 57 A1 --- l_tau Limit flag on tau 58- 61 F4.2 --- tau ?=- AGN optical depth τ 63- 67 F5.1 mJy Fobs Observed flux, at IRAS 60um or Spitzer-MIPS 70um 69- 72 F4.1 mJy e_Fobs rms uncertainty on Fobs 74- 78 F5.2 [Lsun] Lir IR luminosity [log scale] (2) 80- 83 F4.2 [Lsun] e_Lir rms uncertainty on logLir 85 A1 --- l_Lir2 Limit flag on logir2 86- 90 F5.2 [Lsun] Lir2 IR luminosity [log scale] (3) 92- 95 F4.2 [Lsun] e_Lir2 ? rms uncertainty on logLir 97-101 I5 --- PID Spitzer programme number, in pid.dat file 103-104 I2 --- r_Lir2 References for logLir2, in refs.dat file
Note (1): The best fits are obtained by allowing for the values of the AGN intrinsic slope as: a=1.36; b=1.18; c=0.98; d=1.10; e=0.70 Note (2): IR luminosity (in log of solar units) computed as LIR = 4π(DL)2x29.3(f30um)0.93, as detailed in the text. Note (3): tabulated IR luminosity, converted to the WMAP cosmology
Byte-by-byte Description of file: pid.dat
Bytes Format Units Label Explanations
1- 5 I5 --- PID PID number 7- 79 A73 --- Title Title of the observation
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 47 A24 --- Aut Author's name 49- 69 A21 --- Com Comments
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Dec-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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