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Electromagnetic spectrum description in UCD
Version 0.3

IVOA Note 2004-05-20

This version:

http://www.ivoa.net/Documents/Notes/EMSpectrum/NoteEMSpectrum-20040520.html

Latest version:

http://www.ivoa.net/Documents/latest/EMSpectrum.html

Previous version(s):

0.2

Editor(s):

Sébastien Derriere

Author(s):

Sébastien Derriere (derriere@newb6.u-strasbg.fr)

Andrea Preite Martinez (andrea@rm.iasf.cnr.it)

François Ochsenbein (francois@vizir.u-strasbg.fr)

Anita Richards (amsr@jb.man.ac.uk)

Roy Williams (roy@cacr.caltech.edu)

Division of the electromagnetic spectrum.
UCD designation	Wavelength	Frequency	Energy	Notes
Radio Regime
em.radio.20-100MHz	>3m	<100MHz
em.radio.100-200MHz	1.5-3m	100-200MHz
em.radio.200-400MHz	75-150cm	200-400MHz
em.radio.400-750MHz	40-75cm	400-750MHz
em.radio.750-1500MHz	20-40cm	750-1500MHz		21cm line
em.radio.1500-3000MHz	10-20cm	1.5-3GHz
em.radio.3-6GHz	5-10cm	3-6GHz
em.radio.6-12GHz	2.5-5cm	6-12GHz
em.radio.12-30GHz	1-2.5cm	12-30GHz
Millimetric Regime
em.mm.30-50GHz	6-10mm	30-50GHz
em.mm.50-100GHz	3-6mm	50-100GHz
em.mm.100-200GHz	1.5-3mm	100-200GHz		CO
em.mm.200-400GHz	750-1500µm	200-400GHz
em.mm.400-750GHz	400-750µm	400-750GHz
em.mm.750-1500GHz	200-400µm	750-1500GHz		COBE 240µm
em.mm.1500-3000GHz	100-200µm	1500-3000GHz		COBE 140µm
Infra-Red Regime
em.IR.60-100um	60-100µm	3-5THz		IRAS 100µm
em.IR.30-60um	30-60µm	5-10THz		IRAS 60µm
em.IR.15-30um	15-30µm	10-20THz		IRAS 25µm
em.IR.8-15um	8-15µm	20-37.5THz		N band; IRAS 12µm
em.IR.4-8um	4-8µm	37.5-75THz		M band; Br{alpha} =4051nm
em.IR.3-4um	3-4µm	75-100THz		L, L', L''
em.IR.K	2-3µm	100-150THz		K band
em.IR.H	1.5-2.0µm	150-200THz		H band; Pa{alpha} =1875nm, BrLimit =1731nm
em.IR.J	1.0-1.5µm	200-300THz		J band;
Optical Regime
em.opt.I	750-1000nm	300-400THz	1.2-1.6eV	I band; PaLimit =820nm
em.opt.R	600-750nm	400-500THz	1.6-2.0eV	R band; H{alpha} =656nm
em.opt.V	500-600nm	500-600THz	2.0-2.4eV	V band;
em.opt.B	400-500nm	600-750THz	2.4-3.0eV	B band; H{beta} =486nm, H{gamma} =434nm, H{delta} =410nm
em.opt.U	300-400nm	750-1000THz	3.0-4.0eV	U band; BaJump =365nm
Ultra-Violet Regime
em.UV.200-300nm	200-300nm	1000-1500THz	4-6eV	UV1 band
em.UV.100-200nm	100-200nm	1500-3000THz	6-12eV	UV2 band; Ly{alpha} =121.6nm
em.UV.50-100nm	50-100nm	3-6PHz	12-24eV	LyLimit =91.2nm
em.UV.10-50nm	10-50nm	6-30PHz	24-120eV
X-ray Regime
em.X-ray.soft	6-100Å	30-500PHz	0.12-2keV
em.X-ray.medium	1-6Å	0.5-3EHz	2-12keV
em.X-ray.hard	0.1-1Å	3-30EHz	12-120keV
Gamma Regime
em.gamma.soft	0.25-10pm	30-1200EHz	120-500keV
em.gamma.hard	< 250fm	> 1200EHz	> 500keV	e⁺/e^-

UCD designation

Wavelength

Frequency

Energy

Notes

Radio Regime

em.radio.20-100MHz

>3m

<100MHz

em.radio.100-200MHz

1.5-3m

100-200MHz

em.radio.200-400MHz

75-150cm

200-400MHz

em.radio.400-750MHz

40-75cm

400-750MHz

em.radio.750-1500MHz

20-40cm

750-1500MHz

21cm line

em.radio.1500-3000MHz

10-20cm

1.5-3GHz

em.radio.3-6GHz

5-10cm

3-6GHz

em.radio.6-12GHz

2.5-5cm

6-12GHz

em.radio.12-30GHz

1-2.5cm

12-30GHz

Millimetric Regime

em.mm.30-50GHz

6-10mm

30-50GHz

em.mm.50-100GHz

3-6mm

50-100GHz

em.mm.100-200GHz

1.5-3mm

100-200GHz

em.mm.200-400GHz

750-1500µm

200-400GHz

em.mm.400-750GHz

400-750µm

400-750GHz

em.mm.750-1500GHz

200-400µm

750-1500GHz

COBE 240µm

em.mm.1500-3000GHz

100-200µm

1500-3000GHz

COBE 140µm

Infra-Red Regime

em.IR.60-100um

60-100µm

3-5THz

IRAS 100µm

em.IR.30-60um

30-60µm

5-10THz

IRAS 60µm

em.IR.15-30um

15-30µm

10-20THz

IRAS 25µm

em.IR.8-15um

8-15µm

20-37.5THz

N band; IRAS 12µm

em.IR.4-8um

4-8µm

37.5-75THz

M band; Br{alpha} =4051nm

em.IR.3-4um

3-4µm

75-100THz

L, L', L''

em.IR.K

2-3µm

100-150THz

K band

em.IR.H

1.5-2.0µm

150-200THz

H band; Pa{alpha} =1875nm, BrLimit =1731nm

em.IR.J

1.0-1.5µm

200-300THz

J band;

Optical Regime

em.opt.I

750-1000nm

300-400THz

1.2-1.6eV

I band; PaLimit =820nm

em.opt.R

600-750nm

400-500THz

1.6-2.0eV

R band; H{alpha} =656nm

em.opt.V

500-600nm

500-600THz

2.0-2.4eV

V band;

em.opt.B

400-500nm

600-750THz

2.4-3.0eV

B band; H{beta} =486nm, H{gamma} =434nm, H{delta} =410nm

em.opt.U

300-400nm

750-1000THz

3.0-4.0eV

U band; BaJump =365nm

Ultra-Violet Regime

em.UV.200-300nm

200-300nm

1000-1500THz

4-6eV

UV1 band

em.UV.100-200nm

100-200nm

1500-3000THz

6-12eV

UV2 band; Ly{alpha} =121.6nm

em.UV.50-100nm

50-100nm

3-6PHz

12-24eV

LyLimit =91.2nm

em.UV.10-50nm

10-50nm

6-30PHz

24-120eV

X-ray Regime

em.X-ray.soft

6-100Å

30-500PHz

0.12-2keV

em.X-ray.medium

1-6Å

0.5-3EHz

2-12keV

em.X-ray.hard

0.1-1Å

3-30EHz

12-120keV

Gamma Regime

em.gamma.soft

0.25-10pm

30-1200EHz

120-500keV

em.gamma.hard

< 250fm

> 1200EHz

> 500keV

e⁺/e^-

Division of the electromagnetic spectrum.

Changes from UCD 1.9.9

The radio spectrum is divided in 2 parts: radio for wavelengths greater than 1cm, and mm between 0.1 and 10mm. This changes a boundary from 25GHz to 30GHz.

There were 2 inversions of the frequency ranges in the IR regime: 75-100THz vs 100-150THz and 150-200THz vs 200-300THz. This has been corrected.

There was an error of conversion from wavelength to energy for the boundary between X-ray and gamma: 0.1Å was the right value, which corresponds to 120keV (and not 12keV). Thus, the division is the same as in the RM document.

We introduce a vhard band for Xray, to distinguish 2-12keV from 12-120keV.

Notes were added for 21cm and CO emission.

Changes from 0.1

UV and EUV have been merged to follow the Resource Metadata v1.01 document.

Changes from 0.2

X-ray hard and vhard become medium and hard, respectively.

Electromagnetic spectrum description in UCDVersion 0.3

IVOA Note 2004-05-20

Division of the electromagnetic spectrum

Changes from UCD 1.9.9

Changes from 0.1

Changes from 0.2

Electromagnetic spectrum description in UCD
Version 0.3