J/ApJS/214/23 IR spectra and photometry of z<0.5 quasars (Shi+, 2014)
Infrared spectra and photometry of complete samples of Palomar-Green and
Two Micron All Sky Survey quasars.
Shi Y., Rieke G.H., Ogle P.M., Su K.Y.L., Balog Z.
<Astrophys. J. Suppl. Ser., 214, 23 (2014)>
=2014ApJS..214...23S 2014ApJS..214...23S
ADC_Keywords: QSOs ; Photometry, infrared ; Spectra, infrared ; Redshifts ;
Equivalent widths
Keywords: galaxies: active; galaxies: starburst; infrared: galaxies
Abstract:
As a step toward a comprehensive overview of the infrared (IR)
diagnostics of the central engines and host galaxies of quasars at low
redshift, we present Spitzer Space Telescope spectroscopic (5-40µm)
and photometric (24, 70, and 160µm) measurements of all
Palomar-Green (PG) quasars at z<0.5 and Two Micron All Sky Survey
(2MASS) quasars at z<0.3. We supplement these data with Herschel
measurements at 160µm. The sample is composed of 87 optically
selected PG quasars and 52 near-IR-selected 2MASS quasars. Here we
present the data, measure the prominent spectral features, and
separate emission due to star formation from that emitted by the dusty
circumnuclear torus. We find that the mid-IR (5-30µm) spectral
shape for the torus is largely independent of quasar IR luminosity
with scatter in the spectral energy distribution (SED) shape of
≲0.2dex. Except for the silicate features, no large difference is
observed between PG (unobscured --silicate emission) and 2MASS
(obscured --silicate absorption) quasars. Only mild silicate features
are observed in both cases. When in emission, the peak wavelength of
the silicate feature tends to be longer than 9.7µm, possibly
indicating effects on grain properties near the active galactic
nucleus. The IR color is shown to correlate with the equivalent width
of the aromatic features, indicating that the slope of the quasar mid-
to far-IR SED is to first order driven by the fraction of radiation
from star formation in the IR bands.
Description:
For this study we included all 87 objects of the PG sample (Schmidt &
Green 1983ApJ...269..352S 1983ApJ...269..352S; Boroson & Green 1992ApJS...80..109B 1992ApJS...80..109B) at
z<0.5 and all 52 objects of the 2MASS sample (Cutri et al.
2001ASPC..232...78C 2001ASPC..232...78C; Smith et al. 2002, Cat. J/ApJ/569/23) at z<0.3,
as listed in Table 1.
We carried out 25.1hr of Spitzer observations (PID: 50196;
PI: G. Rieke) to complete the Infrared Spectrograph (IRS)
spectroscopic and MIPS photometric data for the PG/2MASS sample. The
program included all objects that did not have archived data from
previous cycles. As a result, there are low-resolution IR spectra
(5-40µm) and MIPS photometry at 24, 70, and 160µm for the entire
sample. All the broad-band photometry is listed in Table 2, while the
IRS data are available in Table 3.
The results of the SED decompositions are shown in Figure 1; with the
fitted profiles, various features are quantified and listed in Table 4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 139 Physical properties of our PG/2MASS sample
table2.dat 96 139 Broad-band photometry of the sample
table3.dat 47 37519 Infrared spectra of the sample
table4.dat 109 139 Measured features and physical parameters
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/241 : 2MASS Catalog Incremental Data Release (IPAC/UMass, 2000)
II/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)
J/ApJS/206/1 : MIR properties of GOALS nearby LIRGs (Stierwalt+, 2013)
J/MNRAS/414/500 : Spitzer/IRS ATLAS project source (Hernan-Caballero+, 2011)
J/ApJ/723/895 : IR luminosities and aromatic features of 5MUSES (Wu+, 2010)
J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)
J/MNRAS/395/1695 : Spitzer MIR spectroscopy of LIRGs (Hernan-Caballero+, 2009)
J/ApJ/692/556 : Star forming galaxy templates (Rieke+, 2009)
J/ApJ/666/806 : SED of Spitzer quasars (QUEST) (Netzer+, 2007)
J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)
J/MNRAS/382/412 : Catalog of SDSS-DR5/2MASS spectroscopic quasars (Ofek, 2007)
J/ApJ/653/127 : 9.7um silicate features in AGNs (Shi+, 2006)
J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)
J/AJ/130/873 : BQS objects in the SDSS DR3 area (Jester+, 2005)
J/ApJ/625/78 : QSOs properties (Hao+, 2005)
J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002)
J/ApJS/95/1 : Atlas of Quasar Energy Distributions (Elvis+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/139] Running sequence number
5- 26 A22 --- Name PG or 2MASSi identifier of the target
28- 29 I2 h RAh Hour of right ascension (J2000)
31- 32 I2 min RAm Minute of right ascension (J2000)
34- 38 F5.2 s RAs Second of right ascension (J2000)
40 A1 --- DE- Sign of declination (J2000)
41- 42 I2 deg DEd Degree of declination (J2000)
44- 45 I2 arcmin DEm Arcminute of declination (J2000)
47- 50 F4.1 arcsec DEs Arcsecond of declination (J2000)
52- 56 F5.3 --- z [0.02/0.5] Redshift
58- 63 F6.3 mag Bmag [12.8/16.4]? B-band magnitude of PG quasars in
Vega system (1)
65- 70 F6.3 mag Ksmag [11.4/15.2]? Ks-band magnitude of 2MASS quasars
in internal 2MASS magnitude system (2)
72- 74 F3.1 --- EL [1/2]? Optical type of emission line (3)
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Note (1): See Schmidt & Green 1983ApJ...269..352S 1983ApJ...269..352S
Note (2): See http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec6_4a.html
Note (3): The optical type of emission line where 1.0 for broad emission
line, 2.0 for narrow emission line and values between 1.0 and 2.0 for
intermediate types.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/139] Running sequence number
5- 26 A22 --- Name PG or 2MASSi identifier
28- 33 F6.2 mJy F24 [-9/954] Spitzer/MIPS 24um flux
35- 38 F4.2 mJy e_F24 [0.2/1] F24 uncertainty
40 A1 --- l_F70 Limit flag on F70
42- 48 F7.2 mJy F70 [10.4/2084]? Spitzer/MIPS 70um flux
50- 54 F5.2 mJy e_F70 [2.1/17.1]? F70 uncertainty
56 A1 --- l_F160 Limit flag on F160
58- 64 F7.2 mJy F160 [48.5/1612]? Spitzer/MIPS 160um flux
66- 70 F5.2 mJy e_F160 [16.6/80.1]? F160 uncertainty
72 A1 --- l_F160H Limit flag on F160H
74- 80 F7.2 mJy F160H [33.6/1885]? Herschel 160um flux
82- 86 F5.2 mJy e_F160H [9.9/17.1]? F160H uncertainty
88- 91 F4.2 --- LL-SL [0.8/5.4]? IRS-LL IRS-SL factor (4)
93- 96 F4.2 --- MIPS-IRS [0.4/2.3]? MIPS IRS factor (4)
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Note (4): The factor in "LL-SL" column is used to multiply with the IRS
short-low to long-low, while the factor in "MIPS-IRS" is used to scale
the IRS to the MIPS 24µm photometry.
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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 [1/139] Running index number
5- 26 A22 --- Name Common source identifier (PG or 2MASSi)
28- 32 F5.2 um lambda [5.52/34.91] Wavelength
34- 40 F7.2 mJy fnu [0.01/1583.5] Flux density at lambda
42- 47 F6.2 mJy e_fnu [0.08/224.7] Error in fnu
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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 [1/139] Running sequence number
5- 26 A22 --- Name PG or 2MASSi identifier
28- 32 F5.2 --- Str9.7 [-1.8/0.7]? 9.7um silicate feature strength
34- 37 F4.2 --- e_Str9.7 [0/1.1]? Str9.7 uncertainty
39- 42 F4.1 um Pk9.7 [3/12.4]? Peak wavelength for the 9.7µm
silicate feature
44- 48 F5.2 --- Str18 [-1.2/0.6]? 18um silicate feature strength
50- 53 F4.2 --- e_Str18 [0/0.6]? Str18 uncertainty
55- 58 F4.1 um Pk18 [3/20.5]? Peak wavelength for the 18µm
silicate feature
60 A1 --- l_EW Limit flag on EW
62- 66 F5.3 um EW [0.004/2.4]? 11.3um PAH equivalent width
68- 72 F5.3 um e_EW [0.002/0.3]? EW uncertainty
74- 78 F5.2 [Lsun] logL5 [9.7/12.41]? log of 5um luminosity
80- 84 F5.2 [Lsun] logL15 [9.43/12.29]? log of 15um luminosity
86- 90 F5.2 [Lsun] logL18 [9.57/12.28]? log of 18um luminosity
92- 96 F5.2 [Lsun] logL25 [9.45/12.32]? log of 25um luminosity
98 A1 --- l_logSFR Limit flag on logSFR
100-104 F5.2 [Msun/yr] logSFR [-1/2.5] log of Star Formation Rate
106-109 F4.2 [Msun/yr] e_logSFR [0.3/0.5]? logSFR uncertainty
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Oct-2014