2015MNRAS.450.3069R


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.10CEST03:20:44

2015MNRAS.450.3069R - Mon. Not. R. Astron. Soc., 450, 3069-3079 (2015/July-1)

The stellar spectral features of nearby galaxies in the near infrared: tracers of thermally pulsing asymptotic giant branch stars?

RIFFEL R., MASON R.E., MARTINS L.P., RODRIGUEZ-ARDILA A., HO L.C., RIFFEL R.A., LIRA P., MARTIN O.G., RUSCHEL-DUTRA D., ALONSO-HERRERO A., FLOHIC H., McDERMID R.M., RAMOS ALMEIDA C., THANJAVUR K. and WINGE C.

Abstract (from CDS):

We analyse the stellar absorption features in high signal-to-noise ratio (S/N) near-infrared (NIR) spectra of the nuclear region of 12 nearby galaxies, mostly spirals. The features detected in some or all of the galaxies in this sample are the TiO (0.843 and 0.886µm), VO (1.048µm), CN (1.1 and 1.4µm), H2O (1.4 and 1.9µm) and CO (1.6 and 2.3µm) bands. The C2 (1.17 and 1.76µm) bands are generally weak or absent, although C2 (1.76µm) may be weakly present in the mean galaxy spectrum. A deep feature near 0.93µm, likely caused by CN, TiO and/or ZrO, is also detected in all objects. Fitting a combination of stellar spectra to the mean spectrum shows that the absorption features are produced by evolved stars: cool giants and supergiant stars in the early- or thermally pulsing asymptotic giant branch (E-AGB or TP-AGB) phases. The high luminosity of TP-AGB stars, and the appearance of VO and ZrO features in the data, suggest that TP-AGB stars dominate these spectral features. However, a contribution from other evolved stars is also likely. Comparison with evolutionary population synthesis models shows that models based on empirical libraries that predict relatively strong NIR features provide a more accurate description of the data. However, none of the models tested accurately reproduces all of the features observed in the spectra. To do so, the models will need to not only improve the treatment of TP-AGB stars, but also include good quality spectra of red giant and E-AGB stars. The uninterrupted wavelength coverage, high S/N and quantity of features we present here will provide a benchmark for the next generation of models aiming to explain and predict the NIR properties of galaxies.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: AGB and post-AGB - galaxies: active - galaxies: bulges - galaxies: stellar content

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2655 LIN 08 55 37.731 +78 13 23.10   12.03 11.08     ~ 261 1
2 NGC 2768 SyG 09 11 37.504 +60 02 13.95 11.30 10.84 9.87     ~ 467 2
3 NGC 2832 BiC 09 19 46.853 +33 44 59.07   13.3 13.17     ~ 244 3
4 NGC 3147 Sy2 10 16 53.632 +73 24 02.34   11.43 10.61     ~ 425 2
5 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 343 1
6 NGC 4102 LIN 12 06 23.115 +52 42 39.42   11.8       ~ 373 1
7 M 91 LIN 12 35 26.430 +14 29 46.75   14.63 13.57     ~ 526 0
8 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 873 0
9 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1276 3
10 HD 110854 SB* 12 44 49.0290947772 +35 38 34.688280299   8.24 8.25     A0V 35 0
11 NGC 4750 LIN 12 50 07.3079114506 +72 52 28.636473003   11.8       ~ 121 0
12 NGC 5005 GiP 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 498 2
13 NGC 5390 LIN 13 55 40.023 +40 27 42.37   12.81 11.93 10.04   ~ 319 1
14 NGC 5850 LIN 15 07 07.676 +01 32 39.41   11.5   10.79 11.1 ~ 279 1

    Equat.    Gal    SGal    Ecl

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2020.08.10-03:20:44

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