IRCS echelle orders

The configuration of the IRCS echelle is adjustable to most user requirements. The following tables list `standard' configurations which should satisfy most applicants.

Go to: zJ, J, H, K, L

zJ-band: orders 48-55

The zJ setting of the echelle provides continuous wavelength coverage from 1.0146 - 1.1912 um.

Order Wavelength
(um) Dispersion
(A/pixel)
48 1.1629 - 1.1912 0.276
49 1.1391 - 1.1670 0.273
50 1.1163 - 1.1437 0.269
51 1.0943 - 1.1214 0.264
52 1.0732 - 1.0998 0.260
53 1.0529 - 1.0791 0.256
54 1.0334 - 1.0591 0.251
55 1.0146 - 1.0398 0.245

J-band: orders 41-48

The J setting of the echelle provides continuous wavelength coverage from 1.1626 - 1.3946 um.

Order Wavelength
(um) Dispersion
(A/pixel)
41 1.3613 - 1.3946 0.326
42 1.3289 - 1.3615 0.319
43 1.2979 - 1.3299 0.313
44 1.2684 - 1.2998 0.307
45 1.2402 - 1.2709 0.301
46 1.2132 - 1.2434 0.295
47 1.1874 - 1.2170 0.289
48 1.1626 - 1.1916 0.283

H-band: orders 31-38

Complete coverage of the H-band requires two settings of the echelle, H^- and H⁺.

H^- H⁺
Order Wavelength
(um) Dispersion
(A/pixel) Wavelength
(um) Dispersion
(A/pixel)
31 1.7926 - 1.8376 0.440
32 1.7365 - 1.7802 0.427 1.7485 - 1.7910 0.416
33 1.6838 - 1.7263 0.415 1.6955 - 1.7368 0.404
34 1.6343 - 1.6756 0.404 1.6455 - 1.6858 0.394
35 1.5875 - 1.6278 0.393 1.5985 - 1.6377 0.384
36 1.5434 - 1.5826 0.383 1.5540 - 1.5923 0.374
37 1.5016 - 1.5399 0.374 1.5120 - 1.5493 0.365
38 1.4621 - 1.4994 0.365 1.4721 - 1.5086 0.357

K-band: orders 23-29

Complete coverage of the K-band requires two echelle settings, K^- and K⁺. In addition, a third setting, K^*, is offered which includes most of the important astronomical emission lines.

K^- K⁺ K^*
Order Wavelength
(um) Dispersion
(A/pixel) Wavelength
(um) Dispersion
(A/pixel) Wavelength
(um) Dispersion
(A/pixel)
23 2.4023 - 2.4656 0.619 2.4456 - 2.5038 0.569 2.3930 - 2.4545 0.602
24 2.3021 - 2.3627 0.592 2.3437 - 2.3997 0.547 2.2931 - 2.3525 0.581
25 2.2098 - 2.2679 0.568 2.2500 - 2.3039 0.527 2.2012 - 2.2587 0.562
26 2.1247 - 2.1805 0.546 2.1634 - 2.2154 0.508 2.1165 - 2.1720 0.543
27 2.0458 - 2.0995 0.525 2.0833 - 2.1335 0.491 2.0380 - 2.0917 0.525
28 1.9726 - 2.0244 0.506 2.0089 - 2.0575 0.475 1.9652 - 2.0172 0.508
29 1.9044 - 1.9544 0.488 1.9397 - 1.9867 0.460 1.8974 - 1.9477 0.492

L-band: orders 14-19

Complete coverage of the L window requires 6 echelle settings. The A^-, A⁰, and A⁺ settings include orders 15-19 only, while the B^-, B⁰, and B⁺ settings include orders 14-17 only. Note that no observations have been made with the echelle at L-band, and therefore these numbers are very preliminary.

A^-/B^- A⁰/B⁰ A⁺/B⁺
Order Wavelength
(um) Dispersion
(A/pixel) Wavelength
(um) Dispersion
(A/pixel) Wavelength
(um) Dispersion
(A/pixel)
14 3.8807 - 3.9891 1.058 3.9838 - 4.0843 0.981 4.0682 - 4.1614 0.910
15 3.6220 - 3.7231 0.987 3.7183 - 3.8120 0.914 3.7969 - 3.8840 0.850
16 3.3956 - 3.4904 0.926 3.4859 - 3.5738 0.858 3.5596 - 3.6412 0.797
17 3.1958 - 3.2851 0.872 3.2808 - 3.3636 0.809 3.3502 - 3.4270 0.750
18 3.0183 - 3.1026 0.823 3.0986 - 3.1767 0.763 3.1641 - 3.2366 0.708
19 2.8594 - 2.9393 0.780 2.9355 - 3.0095 0.722 2.9976 - 3.0663 0.670