2017MNRAS.472..361R

Query : 2017MNRAS.472..361R

2017MNRAS.472..361R - Mon. Not. R. Astron. Soc., 472, 361-372 (2017/November-3)

The puzzling interpretation of NIR indices: The case of NaI2.21.

ROCK B., VAZDEKIS A., LA BARBERA F., PELETIER R.F., KNAPEN J.H., ALLENDE-PRIETO C. and AGUADO D.S.

Abstract (from CDS):

We present a detailed study of the Na I line strength index centred in the K band at 22 100 Å (NaI2.21 hereafter) relying on different samples of early-type galaxies. Consistent with previous studies, we find that the observed line strength indices cannot be fit by state-of-the-art scaled-solar stellar population models, even using our newly developed models in the near infrared (NIR). The models clearly underestimate the large NaI2.21 values measured for most early-type galaxies. However, we develop an Na-enhanced version of our newly developed models in the NIR, which - together with the effect of a bottom-heavy initial mass function - yield NaI2.21 indices in the range of the observations. Therefore, we suggest a scenario in which the combined effect of [Na/Fe] enhancement and a bottom-heavy initial mass function are mainly responsible for the large NaI2.21 indices observed for most early-type galaxies. To a smaller extent, also [C/Fe] enhancement might contribute to the large observed NaI2.21 values.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: abundances - galaxies: stellar content - infrared: galaxies - infrared: stars

CDS comments: XSG1 = 2MASX J14294064+0021593 , XSG2 = 2MASX J00281930-0014472.

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LEDA 212530 G 00 28 19.3058486472 -00 14 46.831458588   16.09   14.79   ~ 22 0
2 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 417 2
3 NGC 636 EmG 01 39 06.5293238064 -07 30 45.475975296   12.5       ~ 196 0
4 NGC 1340 GiG 03 28 19.6251763296 -31 04 05.435465520   11.20 10.32 9.70   ~ 222 1
5 NGC 1357 Sy2 03 33 17.0545498128 -13 39 50.970066984   12.44   11.8 11.3 ~ 152 0
6 NGC 1374 EmG 03 35 16.5885737352 -35 13 34.563417168 12.46 11.97 11.08 10.59   ~ 322 1
7 NGC 1379 GiP 03 36 03.9668625792 -35 26 28.547476800 12.17 12.04 10.91 10.60   ~ 277 1
8 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 460 1
9 NGC 1381 GiP 03 36 31.6592184144 -35 17 42.739221912 12.90 12.47 11.50 11.02   ~ 269 1
10 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
11 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
12 NGC 1419 GiG 03 40 42.1036600944 -37 30 38.778564456   13.56   12.07   ~ 146 0
13 NGC 1425 EmG 03 42 11.4831633240 -29 53 36.186684252   11.61   11.6 10.9 ~ 209 0
14 NGC 1427 GiG 03 42 19.4455150392 -35 23 33.169251120   11.89   10.44   ~ 298 0
15 NGC 1700 EmG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 356 1
16 NGC 2380 GiG 07 23 54.749 -27 31 44.62   12.52   10.77   ~ 57 0
17 NGC 2613 Sy2 08 33 22.841 -22 58 25.21   11.29 10.42 9.75 10.5 ~ 180 0
18 NGC 2781 Sy2 09 11 27.5157906744 -14 49 00.191638668   12.5   11.38 12.0 ~ 78 0
19 NGC 3056 Sy2 09 54 32.8538928504 -28 17 53.628683496   12.61   11.00 12.0 ~ 75 0
20 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1067 2
21 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 798 1
22 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
23 NGC 3605 GiG 11 16 46.5896102400 +18 01 01.777666908   12.7       ~ 261 0
24 NGC 3617 GiP 11 17 50.8633505064 -26 08 03.826617144   13.45   12.12   ~ 56 0
25 NGC 3818 EmG 11 41 57.3563891040 -06 09 20.459153376   13   11.78   ~ 186 0
26 NGC 3892 GiG 11 48 01.0277916720 -10 57 43.632054432   12.21   10.99   ~ 72 0
27 NGC 4179 GiG 12 12 52.1118346920 +01 17 58.926287976   12.8       ~ 179 0
28 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1290 0
29 NGC 4546 Sy2 12 35 29.4931619736 -03 47 35.383858656 11.89 11.30 10.32     ~ 230 1
30 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 615 1
31 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1156 1
32 NGC 4742 GiG 12 51 48.0416784480 -10 27 17.196625800   12   11.55   ~ 235 1
33 NGC 4856 GiG 12 59 21.2433153888 -15 02 31.292291292   11   10.72   ~ 85 0
34 NGC 4958 Sy1 13 05 48.8957905464 -08 01 12.999361656   12.10   10.77   ~ 109 0
35 MCG-06-29-015 EmG 13 13 12.3954981624 -36 43 22.110478536   13.70   12.23   ~ 30 0
36 IC 4214 AG? 13 17 42.6918273984 -32 06 06.103910340   12.15 11.65 10.72 13.84 ~ 121 1
37 NGC 5101 Sy1 13 21 46.242 -27 25 49.87   11.26 10.47 9.87 10.5 ~ 187 0
38 NGC 5507 EmG 14 13 19.8600321120 -03 08 56.000082660   13.30 12.46     ~ 120 0
39 MCG-05-34-007 EmG 14 20 14.4457547088 -29 44 50.909815932   14.06   12.56   ~ 32 0
40 Z 19-45 LIN 14 29 40.6299806520 +00 21 59.004987480   15.7       ~ 34 0
41 NGC 5796 GiP 14 59 24.115 -16 37 26.55   13   11.37   ~ 118 0
42 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 673 2
43 NGC 5831 GiG 15 04 07.0002600408 +01 13 11.705607012   13.1   11.19   ~ 304 0

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