2002AJ....123..184S


Query : 2002AJ....123..184S

2002AJ....123..184S - Astron. J., 123, 184-194 (2002/January-0)

Spiral galaxies with HST/NICMOS. II. Isophotal fits and nuclear cusp slopes.

SEIGAR M., CAROLLO C.M., STIAVELLI M., DE ZEEUW P.T. and DEJONGHE H.

Abstract (from CDS):

We present surface brightness profiles for 56 of the 78 spiral galaxies observed in the HST/NICMOS2 F160W snapshot survey introduced in Paper I of this series, as well as surface brightness profiles for 23 objects out of the 41 that were also observed in the F110W filter. We fit these surface brightness profiles with the Nuker law of Lauer et al. and use the smooth analytical descriptions of the data to compute the average nuclear stellar cusp slopes <γ> in the 0".1-0".5 radial range. Our main result is the startling similarity between the nuclear stellar cusp slopes <γ> in the near-infrared compared with those derived in the visual passband. This similarity has several implications: (1) Despite the significant local color variations that are found in the nuclear regions of spirals and that are documented in Paper I, there are typically little or no optical-NIR global color gradients, and thus no global stellar population variations, inside ∼50-100 pc from the nucleus in nearby spirals. (2) The large observed range of the strength of the nuclear stellar cusps seen in the HST optical study of spiral galaxies reflects a physical difference between galaxies and is not an artifact caused by nuclear dust and/or recent star formation. (3) The dichotomy between R1/4 bulges, with steep nuclear stellar cusps <γ>∼1, and exponential bulges, with shallow nuclear stellar cusps <γ><0.3, is also not an artifact of the effects of dust or recent star formation. (4) The presence of a surrounding massive disk appears to have no effect on the rise of the stellar density distribution within the innermost hundred parsecs of the R1/4 spheroids. These results imply a breakdown within the family of exponential bulges of the nuclear versus global relationships that have been found for the R1/4 spheroids. Such a breakdown is likely to have significant implications concerning the formation of exponential bulges and their connection with the R1/4 spheroids.

Abstract Copyright:

Journal keyword(s): Galaxies: Bulges - Galaxies: Nuclei - Galaxies: Spiral - Galaxies: Structure

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 289 AGN 00 52 42.365 -31 12 20.99   11.36 13.44 10.38 11.4 ~ 225 0
2 NGC 406 G 01 07 25.060 -69 52 45.27   13.02   12.14 12.0 ~ 82 0
3 NGC 488 GiG 01 21 46.7967133224 +05 15 24.623017524   15.0       ~ 284 0
4 NGC 772 GiP 01 59 19.5557148984 +19 00 27.475677216 11.35 11.09 10.31 10.23 9.38 ~ 317 1
5 NGC 972 rG 02 34 13.3574389680 +29 18 40.604917356   12.1 13.63     ~ 164 2
6 NGC 1345 EmG 03 29 31.694 -17 46 42.04   13.67   12.96 13.6 ~ 90 0
7 NGC 1398 GiG 03 38 52.130 -26 20 16.22   10.37   8.90 10.1 ~ 221 0
8 NGC 1483 GiG 03 52 47.608 -47 28 39.06   13.23   13.2 13.0 ~ 76 0
9 NGC 1688 GiG 04 48 23.789 -59 48 01.11   12.57   11.82 12.1 ~ 75 0
10 NGC 1892 GiG 05 17 09.0127062984 -64 57 34.791231996   12.72   11.9 11.8 ~ 72 0
11 NGC 2082 GiG 05 41 51.0901098120 -64 18 03.828857148   12.79   11.45 11.6 ~ 92 0
12 NGC 2196 EmG 06 12 09.6565312104 -21 48 21.667049928   11.98   10.69 11.4 ~ 105 0
13 NGC 2344 rG 07 12 28.6727815248 +47 10 00.302868408   12.99 12.14 11.57 10.80 ~ 89 0
14 NGC 2460 AGN 07 56 52.3308252792 +60 20 57.759748944   12.5       ~ 125 0
15 NGC 2758 EmG 09 05 31.2006079368 -19 02 33.697810140   13.99   13.32 14.0 ~ 47 0
16 NGC 2748 GiG 09 13 43.03707 +76 28 31.2310   11.7       ~ 192 0
17 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1072 3
18 NGC 2964 GiP 09 42 54.251 +31 50 49.97   12.0       ~ 266 1
19 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4260 3
20 NGC 3067 GiG 09 58 21.0726714528 +32 22 12.012636108   12.7       ~ 235 1
21 NGC 3259 Sy1 10 32 34.8614764344 +65 02 27.906884844   17.55 16.89     ~ 150 0
22 NGC 3277 Sy2 10 32 55.4484213912 +28 30 42.279280956 12.74 12.50 11.68     ~ 133 1
23 NGC 3900 GiP 11 49 09.4563144120 +27 01 19.276393872   12.5       ~ 175 0
24 NGC 3898 LIN 11 49 15.370 +56 05 03.66   11.7       ~ 291 1
25 NGC 3949 GiG 11 53 41.7311041896 +47 51 31.401451476   10.9       ~ 322 1
26 NGC 4219 G 12 16 27.312 -43 19 27.41   12.71 11.31 11.09 11.9 ~ 71 0
27 NGC 4384 EmG 12 25 12.012 +54 30 22.07   13.5       ~ 117 1
28 NGC 4527 GiP 12 34 08.496 +02 39 13.72   12.4       ~ 519 2
29 NGC 4536 GiP 12 34 27.129 +02 11 16.37 11.14 11.16 10.55 17.393   ~ 815 3
30 NGC 5188 GiG 13 31 28.293 -34 47 40.10   12.68 11.85     ~ 80 0
31 NGC 5488 GiG 14 08 03.0981865224 -33 18 53.838517212   12.72   11.15   ~ 24 0
32 IC 4390 GiG 14 16 59.180 -44 58 38.52   13.81   12.69   ~ 34 0
33 NGC 5678 AGN 14 32 05.5700264952 +57 55 17.155392060   12.10       ~ 220 1
34 NGC 5985 SyG 15 39 37.0545742176 +59 19 55.216886664   15.24 14.22     ~ 239 0
35 NGC 6340 GiP 17 10 24.8346254376 +72 18 15.919996608   11.87 11.01     ~ 182 1
36 NGC 6384 G 17 32 24.2848390896 +07 03 37.531624968   13.2       ~ 296 0
37 NGC 7013 G 21 03 33.5698770000 +29 53 50.926694208   12.9       ~ 134 0
38 NGC 7162 GiP 21 59 39.0212245824 -43 18 22.098758760   13.36   12.36 12.8 ~ 60 0
39 NGC 7217 LIN 22 07 52.3984675584 +31 21 33.632293572   12.94 11.92     ~ 480 0
40 NGC 7280 GiP 22 26 27.5758899936 +16 08 53.421593496   13.6       ~ 154 0
41 NGC 7421 GiG 22 56 54.3533970816 -37 20 50.437978152 12.61 12.64 11.93 11.71 12.1 ~ 118 1
42 IC 5271 GiG 22 58 01.8445002480 -33 44 32.045372376   12.47   11.04 11.8 ~ 75 0
43 IC 5273 EmG 22 59 26.719 -37 42 10.36   11.90 11.45 11.07 11.6 ~ 127 0
44 NGC 7513 GiG 23 13 14.0669738568 -28 21 27.280137168   12.73   11.40   ~ 82 0

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2023.01.28-10:42:41

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