J/ApJ/857/59 Spitzer/IRS observations of the Galactic Center (Simpson, 2018)
Spitzer Infrared Spectrograph observations of the Galactic Center: quantifying
the Extreme Ultraviolet/Soft X-ray fluxes.
Simpson J.P.
<Astrophys. J., 857, 59 (2018)>
=2018ApJ...857...59S 2018ApJ...857...59S
ADC_Keywords: Galactic center; Spectra, infrared; Interstellar medium
Keywords: Galaxy: center; X-rays: ISM; infrared: ISM; H II regions;
ISM: abundances; ISM: bubbles
Abstract:
It has long been shown that the extreme ultraviolet spectrum of the
ionizing stars of HII regions can be estimated by comparing the
observed line emission to detailed models. In the Galactic Center
(GC), however, previous observations have shown that the ionizing
spectral energy distribution (SED) of the local photon field is
strange, producing both very low excitation ionized gas (indicative of
ionization by late O stars) and also widespread diffuse emission from
atoms too highly ionized to be found in normal HII regions. This paper
describes the analysis of all GC spectra taken by Spitzer's Infrared
Spectrograph and downloaded from the Spitzer Heritage Archive. In it,
HII region densities and abundances are described, and serendipitously
discovered candidate planetary nebulae, compact shocks, and candidate
young stellar objects are tabulated. Models were computed with Cloudy,
using SEDs from Starburst99 plus additional X-rays, and compared to
the observed mid-infrared forbidden and recombination lines. The ages
inferred from the model fits do not agree with recent proposed star
formation sequences (star formation in the GC occurring along streams
of gas with density enhancements caused by close encounters with the
black hole, Sgr A*), with Sgr B1, Sgr C, and the Arches Cluster being
all about the same age, around 4.5Myr old, with similar X-ray
requirements. The fits for the Quintuplet Cluster appear to give a
younger age, but that could be caused by higher-energy photons from
shocks from stellar winds or from a supernova.
Description:
The observations were taken with the Spitzer IRS in Cycles 1 and 4 and
were downloaded from the Spitzer Heritage Archive. The spectra from
programs 3295 (line fluxes published in Simpson+ 2007, J/ApJ/670/1115)
and 0018 (mentioned in Simpson+ but published in this paper) were
reduced and calibrated with the Spitzer S13.2 pipeline; all other data
were reduced and calibrated with the final version of the pipeline,
S18.18. SH and LH spectra are found in programs 0018, 3295, and 40230,
and SL and LL spectra are found in programs 3121, 3189, 3616, and
40230.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 127 7249 *Intensities of lines observed with the Short-Low
Module, Second Order (SL2)
table3.dat 107 13651 *Intensities of lines observed with the Short-Low
Module, First Order (SL1)
table4.dat 256 540 *Intensities of lines observed with the Short-High
Module (SH)
table5.dat 127 12955 *Intensities of lines observed with the Long-Low
Module, Second Order (LL2)
table6.dat 147 12534 *Intensities of lines observed with the Long-Low
Module, First Order (LL1)
table7.dat 176 540 *Intensities of lines observed with the Long-High
Module (LH)
table8.dat 93 26 Positions with measured high-excitation [NeV]
table9.dat 55 44 Positions with substantial high-excitation [OIV]
but no measured [NeV]
table10.dat 64 24 Positions with measured [SI]
table11.dat 51 23 Sources with ice absorption features at 6.0 and 6.8um
--------------------------------------------------------------------------------
Note on table*.dat: From erratum published in 2019, ApJ, 870, 140.
--------------------------------------------------------------------------------
See also:
VI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)
J/ApJ/581/258 : Infrared photometry in the Arches Cluster (Figer+, 2002)
J/A+A/418/363 : Effective collision strengths for Cl II (Tayal+, 2004)
J/ApJS/155/421 : Survey of Galactic Center region at 20cm (Yusef-Zadeh+, 2004)
J/ApJS/165/173 : Chandra sources in Galaxy central 150pc (Muno+, 2006)
J/ApJS/162/346 : Abundance gradients in the Galaxy (Rudolph+, 2006)
J/A+A/453/535 : Classification of bright mid-IR sources (Schuller+, 2006)
J/ApJ/661/801 : Survey for ionization in neutral gas gal. III. (Oey+, 2007)
J/ApJ/670/1115 : IRS spectra at 38 positions in GC (Simpson+, 2007)
J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)
J/ApJ/693/1821 : The Spitzer infrared nearby galaxies survey (Dale+, 2009)
J/ApJS/181/110 : Galactic center X-ray sources (Muno+, 2009)
J/A+A/500/1253 : Electron-impact excitation of ArIII (Munoz Burgos+, 2009)
J/A+A/495/157 : Interstellar extinction in GC (Schultheis+, 2009)
J/ApJ/736/133 : Spitzer-IRS study of massive YSOs in GC (An+, 2011)
J/MNRAS/417/114 : HST/NICMOS Galactic Center survey catalogue (Dong+, 2011)
J/ApJ/737/73 : Infrared extinction toward the Galactic Centre (Fritz+, 2011)
J/A+A/537/A146 : Stellar models with rotation. 0.8<M<120 (Ekstrom+, 2012)
J/A+A/547/A87 : B-like iso-electronic sequence (Liang+, 2012)
J/ApJ/755/40 : HII reg. in Magellanic clouds from MCELS (Pellegrini+, 2012)
J/ApJ/780/110 : SIII collision strengths (Grieve+, 2014)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/ApJS/215/15 : SMaSH+: observations and companion detection (Sana+, 2014)
J/ApJ/789/115 : Quintuplet cluster astrometry and photometry (Stolte+, 2014)
J/ApJ/808/174 : FeII radiative transition rates (Bautista+, 2015)
J/ApJ/830/17 : GC secondary IR astrometric standards (Boehle+, 2016)
J/ApJ/825/132 : NuSTAR hard X-ray survey of the GC. II. (Hong+, 2016)
J/A+A/595/A94 : Temperature structures in GC clouds (Immer+, 2016)
http://sha.ipac.caltech.edu/applications/Spitzer/SHA/ : Spitzer archive
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/48] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 - DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0.08/12.2] Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 sr Ap [3.2e-10/6.6e-09] Aperture
69- 77 E9.3 W/m2/sr I5.34 [5.3e-08/3.1e-06]? Intensity of the
[FeII]5.34um line
79- 87 E9.3 W/m2/sr e_I5.34 [7.2e-09/3.4e-07]? I5.34 uncertainty
89- 97 E9.3 W/m2/sr I5.51 [2.7e-08/1.7e-06]? Intensity of the H2 S(7)
line at 5.51 micrometers
99-107 E9.3 W/m2/sr e_I5.51 [7.5e-09/2.5e-07]? I5.51 uncertainty
109-117 E9.3 W/m2/sr I6.98 [2e-08/2.5e-05] Intensity of the
[ArII]6.98um line (1)
119-127 E9.3 W/m2/sr e_I6.98 [3.1e-10/4.2e-07] I6.98 uncertainty (1)
--------------------------------------------------------------------------------
Note (1): May be blended with H2 S(5) 6.91um.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/48] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 - DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0.08/12.2] Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 sr Ap [4.8e-10/6.6e-09] Aperture
69- 77 E9.3 W/m2/sr I12.28 [7.5e-09/4.2e-07]? Intensity of the H2 S(2)
line at 12.28um
79- 87 E9.3 W/m2/sr e_I12.28 [9.8e-10/1.2e-07]? I12.28 uncertainty
89- 97 E9.3 W/m2/sr I12.81 [2.3e-08/1.4e-05] Intensity of
the [NeII]12.81um line
99-107 E9.3 W/m2/sr e_I12.81 [1.4e-09/4.4e-07] I12.81 uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/49] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 --- DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0.5/11.4]? Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 W/m2/sr I10.51 [4.4e-09/2.6e-07]? Intensity of
the [SIV]10.51um line
68- 76 E9.3 W/m2/sr e_I10.51 [1.1e-09/1.2e-08]? I10.51 uncertainty
78- 86 E9.3 W/m2/sr I12.28 [3.2e-08/4e-07]? Intensity of the
H2 S(2) line at 12.28um
88- 96 E9.3 W/m2/sr e_I12.28 [6.9e-10/3.6e-08]? I12.28 uncertainty
98-106 E9.3 W/m2/sr I12.37 [3.6e-09/2.8e-07]? Intensity of
the H 7-6 line at 12.37um
108-116 E9.3 W/m2/sr e_I12.37 [6.5e-10/2.3e-08]? I12.37 uncertainty
118-126 E9.3 W/m2/sr I12.81 [1.4e-08/1.5e-05]? Intensity of
the [NeII]12.81um line
128-136 E9.3 W/m2/sr e_I12.81 [8.1e-10/1.6e-07]? I12.81 uncertainty
138-146 E9.3 W/m2/sr I14.37 [3.1e-09/1.2e-07]? Intensity of
the [ClII]14.37um line
148-156 E9.3 W/m2/sr e_I14.37 [8.3e-10/3.3e-08]? I14.37 uncertainty
158-166 E9.3 W/m2/sr I15.56 [2e-09/1.4e-05]? Intensity of
the [NeIII]15.56um line
168-176 E9.3 W/m2/sr e_I15.56 [3.4e-10/1.3e-07]? I15.56 uncertainty
178-186 E9.3 W/m2/sr I17.03 [4.4e-08/3.5e-07]? Intensity of
the H2 S(1) line at 17.03um
188-196 E9.3 W/m2/sr e_I17.03 [8e-10/5.6e-08]? I17.03 uncertainty
198-206 E9.3 W/m2/sr I17.88 [1.7e-09/1.1e-07]? Intensity of
the [PIII]17.88um line
208-216 E9.3 W/m2/sr e_I17.88 [5.9e-10/1.4e-08]? I17.88 uncertainty
218-226 E9.3 W/m2/sr I17.94 [1.2e-09/5e-08]? Intensity of
the [FeII]17.94um line
228-236 E9.3 W/m2/sr e_I17.94 [5.9e-10/1.1e-08]? I17.94 uncertainty
238-246 E9.3 W/m2/sr I18.71 [5.3e-09/5.6e-06]? Intensity of
the [SIII]18.71um line
248-256 E9.3 W/m2/sr e_I18.71 [3.4e-10/7e-08]? I18.71 uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [43/47] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 - DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0.5/12.2] Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 sr Ap [2.4e-09/7.3e-09] Aperture
69- 77 E9.3 W/m2/sr I15.56 [4.3e-09/4.1e-06]? Intensity of
the [NeIII]15.56um line
79- 87 E9.3 W/m2/sr e_I15.56 [8e-10/2.3e-07]? I15.56 uncertainty
89- 97 E9.3 W/m2/sr I17.03 [2.5e-08/8e-07]? Intensity of
the H2 S(1) line at 17.03um
99-107 E9.3 W/m2/sr e_I17.03 [8.5e-10/9.9e-08]? I17.03 uncertainty
109-117 E9.3 W/m2/sr I18.71 [5e-09/9.1e-06]? Intensity of
the [SIII]18.71um line
119-127 E9.3 W/m2/sr e_I18.71 [7.7e-10/7e-07]? I18.71 uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [43/47] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 --- DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0/12.2] Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 sr Ap [3.6e-09/7.3e-09] Aperture
69- 77 E9.3 W/m2/sr I25.9 [2.7e-08/1.7e-06]? Intensity of
the [OIV]25.89um line (1)
79- 87 E9.3 W/m2/sr e_I25.9 [7.6e-10/1.3e-07]? I25.9 uncertainty
89- 97 E9.3 W/m2/sr I28.3 [1.7e-08/6e-06]? Intensity of
the H2 S(0) line at 28.22um
99-107 E9.3 W/m2/sr e_I28.3 [1.8e-10/2.6e-07]? I28.3 uncertainty
109-117 E9.3 W/m2/sr I33.5 [1.3e-08/1.2e-05]? Intensity of
the [SIII]33.48um line
119-127 E9.3 W/m2/sr e_I33.5 [1.3e-09/1.8e-06]? I33.5 uncertainty
129-137 E9.3 W/m2/sr I34.8 [4e-08/9.4e-06]? Intensity of
the [SiII]34.82um line
139-147 E9.3 W/m2/sr e_I34.8 [1.9e-09/1.4e-06]? I34.8 uncertainty
--------------------------------------------------------------------------------
Note (1): The [OIV]25.9um line is blended with the [FeII]26.0um line and
cannot be distinguished at the resolution of the Long-Low (LL) module.
There is a weak emission feature in most LL1 spectra whose intensity
cannot be accurately measured on account of its low line/continuum
ratio. Consequently, the estimated intensities of these features are
not in this table, nor were they used in the model comparisons. All
emission features in this table at this wavelength identified as the
[OIV]25.9um line are substantially stronger than any of the weak,
probably mostly [FeII], lines in the other spectra and the centroid
wavelength is 25.9um or shorter.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/49] Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30- 30 A1 --- DE- [-] Sign of the Declination (J2000)
31- 32 I2 deg DEd [28/29] Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 --- tau [0.5/11.4]? Optical Depth at 9.6um
48- 55 I8 --- AORKEY Spitzer/IRS AORKEY
58- 66 E9.3 W/m2/sr I22.9 [5.6e-10/5.1e-07]? Intensity of
the [FeIII]22.93um line
68- 76 E9.3 W/m2/sr e_I22.9 [3.8e-10/3.7e-08]? I22.9 uncertainty
78- 86 E9.3 W/m2/sr I25.9 [6.8e-10/1.7e-06]? Intensity of
the [OIV]25.89um line
88- 96 E9.3 W/m2/sr e_I25.9 [3.4e-10/5.5e-08]? I25.9 uncertainty
98-106 E9.3 W/m2/sr I26.0 [1.8e-09/4e-07]? Intensity of
the [FeII]25.99um line
108-116 E9.3 W/m2/sr e_I26.0 [2.3e-10/2.8e-08]? I26.0 uncertainty
118-126 E9.3 W/m2/sr I28.3 [2.7e-08/1.9e-07]? Intensity of
the H2 S(0) line at 28.22um
128-136 E9.3 W/m2/sr e_I28.3 [5.3e-10/8.3e-08]? I28.3 uncertainty
138-146 E9.3 W/m2/sr I33.5 [1.1e-08/1.3e-05] Intensity of
the [SIII]33.48um line
148-156 E9.3 W/m2/sr e_I33.5 [1.1e-09/2.1e-07] I33.5 uncertainty
158-166 E9.3 W/m2/sr I34.8 [3.4e-08/7.4e-06] Intensity of
the [SiII]34.82um line
168-176 E9.3 W/m2/sr e_I34.8 [1.5e-09/3.3e-07] I34.8 uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Group Grouping (1)
4- 19 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
21- 22 I2 h RAh [17] Hour of Right Ascension (J2000)
24- 25 I2 min RAm [45/46] Minute of Right Ascension (J2000)
27- 30 F4.1 s RAs Second of Right Ascension (J2000)
32- 32 A1 --- DE- [-] Sign of Declination (J2000)
33- 34 I2 deg DEd [28/29] Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 40 I2 arcsec DEs Arcsecond of Declination (J2000)
42- 49 I8 --- AORKEY [23968512/28146944] Spitzer/IRS AORKEY
51- 52 A2 --- IRS IRS module, SH, LH, or LL
54- 61 E8.3 W/m2/sr I14.32 [5.8e-09/7e-06]? Intensity of
the [NeV]14.32um line
63- 70 E8.3 W/m2/sr e_I14.32 [9.7e-11/9.1e-08]? I14.32 uncertainty
72- 79 E8.3 W/m2/sr I24.32 [1.1e-08/7.6e-07]? Intensity of
the [NeV]24.32um line
81- 88 E8.3 W/m2/sr e_I24.32 [1.3e-10/6.3e-09]? I24.32 uncertainty
91- 93 A3 --- Ref Reference(s) (2)
--------------------------------------------------------------------------------
Note (1): Grouping refers to the multiple positions that were observed in the
different sources.
Note (2): References as follows:
1 = Source in Pα map, Dong+ (2011, J/MNRAS/417/114);
2 = Source in radio map, Lang+ (2010ApJS..191..275L 2010ApJS..191..275L);
3 = Source in radio map, Yusef-Zadeh+ (2004, J/ApJS/155/421);
4 = Source in radio map, Immer+ (2012A&A...537A.121I 2012A&A...537A.121I).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Group Grouping (1)
4- 19 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
21- 22 I2 h RAh [17] Hour of Right Ascension (J2000)
24- 25 I2 min RAm [44/47] Minute of Right Ascension (J2000)
27- 30 F4.1 s RAs Second of Right Ascension (J2000)
32- 32 A1 --- DE- [-] Sign of the Declination (J2000)
33- 34 I2 deg DEd [28/29] Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 40 I2 arcsec DEs ? Arcsecond of Declination (J2000)
42- 49 I8 --- AORKEY [999999/28146688]? Spitzer/IRS AORKEY
51- 53 A3 --- IRS IRS module, SH, LH, SL, or LL
55 A1 --- Notes Notes or references (2)
--------------------------------------------------------------------------------
Note (1): Grouping refers to the multiple positions that were observed in the
different sources. In this table the first entry of a grouping is
sometimes provided with a name or a position that should be more accurate
than the coordinates of the individual positions where the spectra were
taken. For these header rows, there are no data (AORKEY, etc) provided as
they carry only positional data.
Note (2): Notes or references on sources as follows:
a = The [NeIII]15.6um line in the SH spectrum is saturated.
The intensity of the [NeIII]36.015um line in the LH spectrum is
3.10±0.38x10e-7W/m2/sr;
b = The intensity of the [NaIII]7.32um line is
4.88±0.26x10e-7W/m2/sr;
c = The intensity of the [ArIII]8.99um line is
4.57±0.18x10e-7W/m2/sr;
d = Observed in LL2 only, but the [NeIII]15.6um line is brighter
than the [SIII]18.7um line;
1 = Source in Pα map, Dong+ (2011, J/MNRAS/417/114)
2 = Source in radio map, Yusef-Zadeh+ (2004, J/ApJS/155/421).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table10.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
18- 19 I2 h RAh [17] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [42/48] Minute of Right Ascension (J2000)
24- 27 F4.1 s RAs Second of Right Ascension (J2000)
29- 29 A1 --- DE- [-] Sign of the Declination (J2000)
30- 31 I2 deg DEd [28/29] Degree of Declination (J2000)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000)
36- 37 I2 arcsec DEs Arcsecond of Declination (J2000)
39- 46 I8 --- AORKEY [3822592/28146944] Spitzer/IRS AORKEY
48- 55 E8.2 W/m2/sr I25.25 [1.5e-09/2e-08] Intensity of
the [SI]25.25um line
57- 64 E8.2 W/m2/sr e_I25.25 [3.3e-10/4.7e-09] I25.25 uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table11.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Pos Position on Sky (GLLL.llll+B.bbbb)
19- 20 I2 h RAh [17] Hour of Right Ascension (J2000)
22- 23 I2 min RAm [44/47] Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31- 31 A1 --- DE- [-] Sign of the Declination (J2000)
32- 33 I2 deg DEd [28/29] Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
44- 51 I8 --- AORKEY [10455808/23974656] Spitzer/IRS AORKEY
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Feb-2019