J/ApJS/206/1 Mid-IR properties of GOALS nearby LIRGs (Stierwalt+, 2013)
Mid-infrared properties of nearby luminous infrared galaxies.
I. Spitzer infrared spectrograph spectra for the GOALS sample.
Stierwalt S., Armus L., Surace J.A., Inami H., Petric A.O., Diaz-Santos T.,
Haan S., Charmandaris V., Howell J., Kim D.C., Marshall J.,
Mazzarella J.M., Spoon H.W.W., Veilleux S., Evans A., Sanders D.B.,
Appleton P., Bothun G., Bridge C.R., Chan B., Frayer D., Iwasawa K.,
Kewley L.J., Lord S., Madore B.F., Melbourne J.E., Murphy E.J., Rich J.A.,
Schulz B., Sturm E., U V., Vavilkin T., Xu K.
<Astrophys. J. Suppl. Ser., 206, 1 (2013)>
=2013ApJS..206....1S 2013ApJS..206....1S
ADC_Keywords: Galaxies, IR ; Equivalent widths ; Spectra, infrared
Keywords: galaxies: active - galaxies: interactions - galaxies: nuclei -
galaxies: starburst - infrared: galaxies
Abstract:
The Great Observatories All-Sky LIRG Survey (GOALS, Armus et al.
2009PASP..121..559A 2009PASP..121..559A) is a comprehensive, multiwavelength study of
luminous infrared galaxies (LIRGs) in the local universe. Here we
present low resolution Spitzer Infrared Spectrograph spectra covering
5-38um and provide a basic analysis of the mid-IR spectral properties
observed for nearby LIRGs. In a companion paper, we discuss detailed
fits to the spectra and compare the LIRGs to other classes of
galaxies. The GOALS sample of 244 nuclei in 180 luminous
(1011≤LIR/L☉<1012) and 22 ultraluminous
(LIR/L☉≥1012) IR galaxies represents a complete subset of
the IRAS Revised Bright Galaxy Sample (Sanders, 2003,
Cat. J/AJ/126/1607) and covers a range of merger stages, morphologies,
and spectral types. The majority (>60%) of the GOALS LIRGs have high
6.2um polycyclic aromatic hydrocarbon (PAH) equivalent widths
(EQW6.2um>0.4um) and low levels of silicate absorption
(s9.7um>-1.0).
Description:
In this paper, we present the mid-infrared (MIR) spectra for 244
galaxy nuclei in the 202 nearby GOALS U/LIRG systems taken with the
low resolution module on the Spitzer IRS. New spectra were obtained
using the staring mode for the IRS SL (5.5-14.5um) and LL (14-38um)
modules for 157 galaxies (PID 30323; PI: L. Armus). Archival
spectroscopic observations were used for the remaining 45 systems and
borrowed most heavily from staring program PIDs 105, 3247, & 20549 and
mapping program PIDs 73, 3269, & 30577.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 244 Mid-IR spectral parameters for the GOALS sample
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See also:
J/A+A/546/A64 : H and K-band stacked spectra of U/LIRGs (Piqueras Lopez+, 2012)
J/MNRAS/414/702 : Optical classification of southern ULIRGs (Lee+, 2011)
J/ApJ/741/32 : Spatial extent of (U)LIRGs in the MIR. II. (Diaz-Santos+, 2011)
J/ApJ/723/993 : Spatial extent of (U)LIRGs in the MIR. I. (Diaz-Santos+, 2010)
J/ApJ/709/884 : Role of starburst-AGN composites in LIRG mergers (Yuan+, 2010)
J/ApJ/715/572 : GOALS UV and FIR properties (Howell+, 2010)
J/MNRAS/395/1695 : Spitzer MIR spectroscopy of LIRGs (Hernan-Caballero+, 2009)
J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z∼2 ULIRGs (Yan+, 2007)
J/A+A/467/565 : z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007)
J/AJ/132/2596 : Spectroscopy of Ultraluminous IR galaxies (Darling+, 2006)
J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)
J/AJ/121/97 : K-band spectroscopy of ULIRGs (Murphy+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Luminous InfraRed Galaxy name
19- 20 I2 h RAh ? IRS-SL Hour of Right Ascension (J2000) (1)
22- 23 I2 min RAm ? IRS-SL Minute of Right Ascension (J2000) (1)
25- 28 F4.1 s RAs ? IRS-SL Second of Right Ascension (J2000) (1)
30 A1 --- DE- IRS-SL Sign of the Declination (J2000) (1)
31- 32 I2 deg DEd ? IRS-SL Degree of Declination (J2000) (1)
34- 35 I2 arcmin DEm ? IRS-SL Arcminute of Declination (J2000) (1)
37- 40 F4.1 arcsec DEs ? IRS-SL Arcsecond of Declination (J2000) (1)
42- 47 F6.1 deg SLPA ? IRS-SL position angle of the field-of-view (1)
48 A1 --- f_SLPA [*] User-selected SL angle (2)
50- 51 I2 h RALh ? IRS-LL Hour of Right Ascension (J2000) (1)
53- 54 I2 min RALm ? IRS-LL Minute of Right Ascension (J2000) (1)
56- 59 F4.1 s RALs ? IRS-LL Second of Right Ascension (J2000) (1)
61 A1 --- DEL- IRS-LL Sign of the Declination (J2000) (1)
62- 63 I2 deg DELd ? IRS-LL Degree of Declination (J2000) (1)
65- 66 I2 arcmin DELm ? IRS-LL Arcminute of Declination (J2000) (1)
68- 71 F4.1 arcsec DELs ? IRS-LL Arcsecond of Declination (J2000) (1)
73- 78 F6.1 deg LLPA ? IRS-LL position angle of the field-of-view (1)
79 A1 --- f_LLPA [*] User-selected LL angle (2)
81 A1 --- l_EW Limit flag on EW
82- 85 F4.2 um EW ? Equivalent width of 6.2µm PAH feature
87- 91 F5.3 um e_EW ? The 1σ uncertainty in EW
93- 97 F5.2 --- s9.7 ? Apparent optical depth τ of 9.7µm
silicate absorption feature
99-102 F4.2 --- e_s9.7 ? The 1σ uncertainty in s9.7
104-108 F5.2 --- 30/15 ? Flux density ratio Fν(30µm) to
Fν(15µm)
110-113 F4.2 --- e_30/15 ? The 1σ uncertainty in Ratio
115-118 F4.2 --- Scale ? SL-to-LL scale factor
120 A1 --- M1 [Na-d] Merger stage (3)
122 I1 --- M2 [0/6]? Merger stage as derived from HST data (4)
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Note (1): the Spitzer Infrared Spectrograph (IRS) used in SL (short
wavelength [5.5-14.5]µm, low resolution) or LL (long wavelength
[14-38]µm, low resolution) modes. For staring mode data: RA_FOV,
DEC_FOV, & PA_FOV from the headers with a pointing accuracy within 1";
for mapping mode data: calculated from the four corners of the
extraction aperture used in CUBISM.
Note (2):
* = Data was taken in mapping mode, and so the PA was user-selected.
Note (3): Merger stage as follows:
N = nonmerger;
a = pre-merger;
b = early stage merger;
c = mid-stage merger;
d = late stage merger, see Section 2.5 for details.
Note (4): Merger stage (from HST) as follows:
0 = nonmerger;
1 = pre-merger;
2 = ongoing merger with separable progenitor galaxies;
3 = ongoing merger with progenitors sharing a common envelope;
4 = ongoing merger with double nuclei plus tidal tail;
5 = post-merger with single nucleus plus prominent tail;
6 = post-merger with single nucleus with disturbed morphology,
as described in Haan et al. (2011AJ....141..100H 2011AJ....141..100H).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Jun-2013