J/ApJS/279/15 Extended atlas of LRS spectra from IRAS (Sloan+, 2025)
The extended atlas of Low-Resolution Spectra from the Infrared Astronomical
Satellite.
Sloan G.C., Kraemer K.E., Volk K.
<Astrophys. J. Suppl. Ser., 279, 15 (2025)>
=2025ApJS..279...15S 2025ApJS..279...15S
ADC_Keywords: Spectra, infrared
Mission_Name: IRAS
Keywords: Infrared spectroscopy
Abstract:
We present an updated atlas of spectra from the Low-Resolution
Spectrometer (LRS) on the Infrared Astronomical Satellite (IRAS),
which took spectra from 7.67 to 22.73µm with a spectral resolving
power (λ/Δλ) of 20-60. The updated atlas includes
11238 spectra, including 5425 spectra published in the original LRS
Atlas, 5796 spectra published in three later papers, and 17 spectra
previously available online but not published. The updated atlas has
significantly more sources close to the Galactic plane than the
original atlas. We have applied an improved spectral correction to
remove an artifact at 8µm in the original database. While the IRAS
mission flew over 40yr ago, the extended LRS atlas remains the single
most complete database of mid-infrared spectra of nearby and bright
objects in the Galaxy.
Description:
The sample presented here is based on the sample on the server at the
University of Calgary, with some modifications. It includes all 5425
sources in the LRS Atlas (Olnon+ 1986A&AS...65..607O 1986A&AS...65..607O; see III/197).
Those sources are referred to here as the "original" sample. It also
includes all 356 spectra brighter than 40Jy at 12um added by
Volk & Cohen (1989AJ.....98..931V 1989AJ.....98..931V), all but one of the 486 spectra
with flux densities at 12um between 20 and 40Jy added by
Volk+ (1991ApJS...77..607V 1991ApJS...77..607V), and 4955 of the 4957 sources added by
Kwok+ (1997, J/ApJS/112/557). Together, these three groups of spectra
are referred to as the "supplemental" sample. Finally, the present
sample also contains 17 additional spectra on the University of
Calgary server but not included by Kwok+ (1997); these are the "extra"
sources.
The spectra have a spectral resolving power between 20 and 60.
If you use IRAS_LRS data, please cite both the journal article Sloan,
Kraemer, & Volk (2025ApJS..279...15S 2025ApJS..279...15S) and the dataset Digital Object
Identifier (DOI): 10.26131/IRSA630
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 111 11238 The catalog of sources in the extended LRS atlas
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
III/197 : IRAS Low Resolution Spectra (IRAS team, 1987)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
II/338 : IRAS PSC/FSC Combined Catalogue (Abrahamyan+ 2015)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/ApJS/112/557 : Classification of IRAS Sources (Kwok+ 1997)
J/ApJS/119/141 : Oxygen-rich dust shells IR spectral classif. (Sloan+ 1998)
J/ApJS/151/299 : Spectra classification from ISO PHT-S database (Hodge+, 2004)
J/AJ/132/1445 : Standard calibration stars infrared spectra (Engelke+, 2006)
J/AJ/149/11 : Spectra of candidate standard stars in mid-IR (Sloan+, 2015)
J/AJ/165/99 : Absolute Calibration. III. Sirius & Sun IR sp. (Rieke+, 2023)
http://irsa.ipac.caltech.edu/data/IRAS/LRS/overview.html : Extended atlas of
LRS from IRAS on NASA/IRSA
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- IRAS IRAS PSC name (HHMMm+DDMMA; B1950)
13- 22 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
24- 33 F10.6 deg DEdeg Declination in decimal degrees (J2000)
35- 53 A19 --- RefPos Reference for position (1)
55- 62 A8 --- Source Source of data (2)
64- 65 I2 --- LRS [-1/96] LRS characterization (3)
67 A1 --- VC89 VC89 classification (4)
69- 78 E10.3 Jy Flux12 [0.2/47530]?=-1 Flux density at 12 microns from
IRAS PSC (5)
80- 89 E10.3 Jy Flux25 [0.2/23070]?=-1 Flux density at 25 microns from
IRAS PSC (5)
91- 100 E10.3 Jy Flux09 [0.1/1970]?=-1 Flux density at 9 microns from
AKARI/IRC PSC (5)
102- 111 E10.3 Jy Flux18 [0.3/2652]?=-1 Flux density at 18 microns from
AKARI/IRC PSC (5)
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Note (1): Bibcode references are to (in order of decreasing occurrences):
Gaia EDR3 (released in 2020; Cat. I/350),
Gaia DR2 (I/345),
2MASS (II/246),
IRAS PSC (1988NASAR1190....1B 1988NASAR1190....1B; see II/125),
Hipparcos (van Leeuwen 2007A&A...474..653V 2007A&A...474..653V; Cat. I/311),
Simbad and others...
Note (2): Source as follows:
original = original LRS Atlas (Olnon+ 1986A&AS...65..607O 1986A&AS...65..607O; see III/197)
vc89 = Volk & Cohen 1989AJ.....98..931V 1989AJ.....98..931V
volk91 = Volk et al. 1991ApJS...77..607V 1991ApJS...77..607V
kwok97 = Kwok et al. 1997, J/ApJS/112/557
extra = unpublished sources in the Calgary database; see Table 6
Note (3): Characterizations have a value of -1 for sources not in the original
LRS Atlas (see III/197, col. LRSChar).
Note (4): The spectral classifications defined by
Volk & Cohen (1989AJ.....98..931V 1989AJ.....98..931V; the VC89 classes) are as given by
Kwok+ 1997, J/ApJS/112/557 or Table 6 for the "extra" sources.
Spectral Classes from VC89, as in Table 9, as follows:
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Sp. Description N Fraction Analogous LRS
class of Total Characterizations
(%)
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S Dust-free stellar continuum 1635 14.5 16-19, 01
F Featureless nonstellar blue cont. 1944 17.3 13-16, 01
E Silicate emission at 10 mum 3617 32.2 2n, 13-16, 42-43, 69,
01
A Silicate absorption at 10 mum 319 2.8 3n
C SiC dust emission at 11.3 mum 715 6.4 4n, 14-17
P PAH emission features 315 2.8 80, 32-35, 81
H Red continuum 638 5.7 91, 80-81, 05, 7n, 5n
L Emission lines 31 0.3 94-95
U Unusual spectrum 661 5.9 12-15, 50, 21-23, 01
I Incomplete or noisy spectrum 1363 12.1 01, 05, 1n, 50
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Note (5): Photometry is not color-corrected.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Feb-2026