2016ApJ...833..272Y


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST09:57:22

2016ApJ...833..272Y - Astrophys. J., 833, 272-272 (2016/December-3)

Star formation in ultraluminous infrared galaxies probed with AKARI near-infrared spectroscopy.

YANO K., NAKAGAWA T., ISOBE N. and SHIRAHATA M.

Abstract (from CDS):

We conducted systematic observations of the H i Brα line (4.05 µm) and the polycyclic aromatic hydrocarbon (PAH) feature (3.3 µm) in 50 nearby (z<0.3) ultraluminous infrared galaxies (ULIRGs) with AKARI. The Brα line is predicted to be the brightest among the H i lines under conditions of high dust extinction (AV>15 mag). The Brα line traces ionizing photons from OB stars and so is used as an indicator of star formation on the assumption of the initial mass function. We detected the Brα line in 33 ULIRGs. The luminosity of the line (LBrα) correlates well with that of the 3.3 µm PAH emission (L3.3). Thus we utilize L3.3 as an indicator of star formation in fainter objects where the Brα line is undetected. The mean LBrα/LIR ratio in LINERs/Seyferts is significantly lower than that in H ii galaxies. This difference is reconfirmed with the L3.3/LIR ratio in the larger sample (46 galaxies). Using the ratios, we estimate that the contribution of starburst in LINERs/Seyferts is ∼67%, and active galactic nuclei contribute the remaining ∼33%. However, comparing the number of ionizing photons, QBrα, derived from LBrα with that, QIR, expected from the star formation rate required to explain LIR, we find that the mean QBrα/QIR ratio is only (55.5 ± 7.5)% even in H ii galaxies, which are thought to be energized by pure starburst. This deficit of ionizing photons traced by the Brα line is significant even taking heavy dust extinction into consideration. We propose that dust within H ii regions absorbs a significant fraction of ionizing photons.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: star formation - infrared: galaxies - infrared: galaxies

Simbad objects: 53

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Number of rows : 53

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRAS F00183-7111 Sy2 00 20 34.7 -70 55 27     20.6     ~ 123 0
2 IRAS 00456-2904 H2G 00 48 06.7010068082 -28 48 18.548437413   18.14       ~ 50 1
3 6dFGS gJ005040.3-270440 LIN 00 50 40.41 -27 04 38.3   18.369   18.305   ~ 33 0
4 IRAS 01199-2307 H2G 01 22 20.884 -22 52 05.62   18.04     17.33 ~ 44 0
5 6dFGS gJ013221.4-072908 H2G 01 32 21.41 -07 29 08.5   19.04       ~ 55 0
6 PSCz Q01355-1814 H2G 01 37 56.6 -17 59 25           ~ 24 0
7 2MASX J01515140-1830464 G 01 51 51.4246135039 -18 30 46.604977599   18.77       ~ 33 1
8 2MASX J01591372-2924356 Sy1 01 59 13.725 -29 24 35.61   18.18 18.20     ~ 43 1
9 LEDA 165347 G 02 50 02.4 -37 32 43           ~ 18 0
10 6dFGS gJ032322.9-075614 LIN 03 23 22.867 -07 56 15.29   18.93 18.40 17.30   ~ 30 0
11 IRAS 03521+0028 LIN 03 54 42.146 +00 37 03.33           ~ 81 0
12 6dFGS gJ040930.4-275343 G 04 09 30.2 -27 53 46   18.33   17.25   ~ 21 0
13 6dFGS gJ043337.1-164331 LIN 04 33 37.05 -16 43 31.5   19.80   18.54   ~ 33 0
14 6dFGS gJ050400.7-293654 G 05 04 00.7 -29 36 54   18.57   17.77   ~ 23 0
15 2MASX J05210136-2521450 Sy2 05 21 01.3987198411 -25 21 45.269338983   15.47 14.75     ~ 441 0
16 2MASX J06025406-7103104 LIN 06 02 54.066 -71 03 10.48   15.6       ~ 77 1
17 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 370 1
18 IRAS 08592+5248 FIR 09 02 47.50 +52 36 30.0           ~ 7 0
19 UGC 5101 Sy1 09 35 51.599 +61 21 11.33   15.20 15.50     ~ 519 4
20 2MASX J09530021+8127282 LIN 09 53 00.216 +81 27 28.22           ~ 30 0
21 LEDA 2816688 LIN 09 56 34.3 +08 43 06       20.90   ~ 53 0
22 NVSS J100626+272543 rG 10 06 26.320 +27 25 46.48           ~ 35 0
23 LEDA 165552 LIN 10 12 16.4 +46 49 42       22.20   ~ 37 0
24 2MASX J10522356+4408474 LIN 10 52 23.518 +44 08 47.60           ~ 60 0
25 2MASX J11021405+3802352 H2G 11 02 13.9784635422 +38 02 35.115227222           ~ 25 0
26 LEDA 139520 LIN 11 05 37.538 +31 14 32.18           ~ 43 0
27 IRAS 11180+1623 LIN 11 20 41.75 +16 06 56.8           ~ 31 0
28 LEDA 2816771 LIN 11 41 22.031 +40 59 50.31           ~ 44 0
29 LEDA 140007 H2G 12 47 07.745 +37 05 36.64           ~ 26 0
30 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1827 3
31 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 840 3
32 IRAS 13469+5833 H2G 13 48 40.079 +58 18 52.00   17.5       ~ 42 0
33 2MASX J13561001+2905355 AGN 13 56 09.992 +29 05 35.08   17.23       ~ 56 0
34 2dFGRS TGN206Z237 LIN 14 14 45.5282420189 -01 40 54.805042208   18.006   17.772   ~ 30 0
35 2MASX J14223136+2602049 H2G 14 22 31.3873621186 +26 02 05.256515503           ~ 42 0
36 2MASX J14410437+5320088 Sy2 14 41 04.377 +53 20 08.75   18.29 17.77     ~ 61 0
37 LEDA 84437 G 15 05 39.548 +57 43 07.07           ~ 27 0
38 IRAS 16334+4630 LIN 16 34 52.1 +46 24 53   17.66       ~ 41 1
39 LEDA 2817027 LIN 16 48 01.70 +51 55 44.4           ~ 31 0
40 LEDA 90261 LIN 16 49 46.88 +54 42 35.4   17.5       ~ 60 1
41 [DLK2001] IRAS F17028+5817 W GiP 17 03 41.90 +58 13 43.5           ~ 10 0
42 2MASX J17034196+5813443 LIN 17 03 41.960 +58 13 44.37           ~ 50 0
43 [DLK2001] IRAS F17028+5817 E GiP 17 03 43.61 +58 13 42.9           ~ 9 0
44 2MASX J17042850+6716277 LIN 17 04 28.506 +67 16 27.78     17.0     ~ 49 0
45 LEDA 165718 H2G 17 08 32.12 +40 23 28.2           ~ 39 0
46 2MASX J17185436+5441486 Sy2 17 18 54.2347 +54 41 47.464           ~ 71 1
47 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0
48 NAME Superantennae Sy2 19 31 21.4252803168 -72 39 21.448768732   17.39 16.37 14.65   ~ 280 2
49 LEDA 2817305 LIN 21 50 16.2 +05 16 04       23.10   ~ 21 0
50 6dFGS gJ221133.8-181706 H2G 22 11 33.8 -18 17 06   18.38       ~ 31 0
51 IRAS 23129+2548 LIN 23 15 21.3 +26 04 32           ~ 43 0
52 ESO 148-2 Sy2 23 15 46.772 -59 03 15.94   14.94 14.73 13.95   ~ 236 1
53 [VV2000] J235225.0+244009 Sy2 23 52 25.9821 +24 40 16.239     16.20     ~ 49 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-09:57:22

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