1994A&AS..105..341G

Query : 1994A&AS..105..341G

1994A&AS..105..341G - Astron. Astrophys., Suppl. Ser., 105, 341-383 (1994/June-2)

Interstellar matter in Shapley-Ames elliptical galaxies. II. The distribution of dust and ionized gas.

GOUDFROOIJ P., HANSEN L., JORGENSEN H.E. and NORGAARD-NIELSEN H.U.

Abstract (from CDS):

We present results of deep optical CCD imaging for a complete, optical magnitude-limited sample of 56 elliptical galaxies from the RSA catalog. For each galaxy we have obtained broad-band images (in B, V, and I) and narrow-band images using interference filters isolating the Hα+[NII] emission lines to derive the amount and morphology of dust and ionized gas. Detailed consideration of systematic errors due to effects of sky background subtraction and removal of stellar continuum light from the narrow-band images is described. The flux calibration of the narrow-band images is performed by deconvolving actually measured spectral energy distributions with the filter transmission curves. We also present optical long-slit spectroscopy to determine the [NII]/Hα intensity ratio of the ionized gas. Dust lanes and/or patches have been detected in 23 galaxies (41%) from this sample using both colour-index images and division by purely elliptical model images. We achieved a detection limit for dust absorption of AB∼0.02. Accounting for selection effects, the true fraction of elliptical galaxies containing dust is estimated to be of order 80%. This detection rate is comparable to that of the IRAS satellite, and significantly larger than results of previous optical studies. Ionized gas has been detected in 32 galaxies (57%). The spectroscopic data confirm the presence and distribution of ionized gas as seen in the direct imaging. All elliptical galaxies in our sample in which a number of emission lines is detected show very similar emission-line intensity ratios, which are typical of LINER nuclei. The amounts of detectable dust and ionized gas are generally small–of order 104-105M☉ of dust and 103-104M☉ of ionized gas. The dust and ionized gas show a wide variety of distributions-extended along either the apparent major axis, or the minor axis, or a skewed axis, indicating that triaxiality is in general required as a galaxy figure. In some cases (NGC 1275, NGC 2325, NGC 3136, NGC 3962, NGC 4696, NGC 5018, NGC 5044, NGC 5813, IC 1459) the interstellar matter has a patchy or filamentary distribution, suggestive of a recent interaction event. The distributions of dust and ionized gas are consistent with being physically associated with each other.

Abstract Copyright: ∼

Journal keyword(s): galaxies: elliptical - elliptical galaxies: interstellar matter, photometry, structure

Simbad objects: 57

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Number of rows : 57
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 NGC 596 GiG 01 32 51.9046959816 -07 01 53.646821220   11.5       ~ 247 0
2 BAX 028.2522-13.7387 ClG 01 53 00.40 -13 44 18.0           ~ 389 0
3 NGC 720 Sy1 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 536 0
4 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 592 0
5 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
6 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
7 NGC 1395 SyG 03 38 29.789 -23 01 39.69   10.71   8.99   ~ 289 0
8 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
9 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
10 NGC 1427 GiG 03 42 19.4455150392 -35 23 33.169251120   11.89   10.44   ~ 298 0
11 NGC 1537 GiG 04 13 40.6728494904 -31 38 42.789379560   11.54   10.11   ~ 106 0
12 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 255 1
13 NGC 1700 EmG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 356 1
14 NGC 2325 rG 07 02 40.40266151 -28 41 50.0483640   12.17   10.46   ~ 117 1
15 NGC 2300 AG? 07 32 20.486 +85 42 31.90   12.2       ~ 346 0
16 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 463 0
17 NGC 2986 EmG 09 44 16.0193679072 -21 16 40.971622512   11.60 10.93 9.96   ~ 171 0
18 NGC 3136 GiG 10 05 48.0247938960 -67 22 40.395096300   11.60 11.00 10.05   ~ 101 0
19 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 301 1
20 NGC 3250 rG 10 26 32.2832570136 -39 56 38.471500356   12.26 11.03 10.57   ~ 96 0
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 3557 Sy1 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 283 2
24 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 527 0
25 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 327 0
26 NGC 3613 GiG 11 18 36.130 +57 59 59.73   11.6       ~ 221 0
27 NGC 3640 GiG 11 21 06.852 +03 14 05.15 11.89 11.36 10.44     ~ 291 3
28 NGC 3706 EmG 11 29 44.4309190968 -36 23 28.745465928   12.20 11.08 10.56   ~ 149 0
29 NGC 3904 GiG 11 49 13.206 -29 16 36.09   11.82 10.96 10.29   ~ 162 0
30 NGC 3962 LIN 11 54 40.0986420456 -13 58 30.234748836   13.16 12.16 11.15   ~ 162 1
31 NGC 4125 GiP 12 08 06.017 +65 10 26.88 11.14 10.65 9.72     ~ 448 2
32 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1290 0
33 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 988 2
34 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 871 0
35 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
36 NGC 4373 rG 12 25 17.8183715160 -39 45 35.245218672   11.59 11.05 10.09   ~ 116 2
37 IC 3370 Sy2 12 27 37.3278534168 -39 20 16.247588712   11.99 12.12 10.39   ~ 152 0
38 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 671 1
39 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
40 NGC 4494 GiP 12 31 24.0391348536 +25 46 30.071664120   10.55 9.74     ~ 491 0
41 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 615 1
42 NGC 4589 LIN 12 37 24.9947272593 +74 11 30.861224110   12.0       ~ 300 1
43 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 721 0
44 NGC 4660 GiP 12 44 31.9814021280 +11 11 25.739106972   12.1       ~ 434 0
45 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
46 NGC 4696 rG 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 510 3
47 NGC 5018 GiP 13 13 01.0452720960 -19 31 05.649751992   11.71   10.31   ~ 335 1
48 NGC 5044 BiC 13 15 23.9607836592 -16 23 07.547751744   11.9   10.74   ~ 531 0
49 NGC 5061 Sy2 13 18 05.054 -26 50 14.00   11.18 10.41 9.66 13.59 ~ 181 0
50 IC 4296 rG 13 36 39.03253319 -33 57 57.0730368   11.52 12.99 10.00 10.79 ~ 520 2
51 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 432 2
52 NGC 5576 GiP 14 21 03.691 +03 16 15.78 12.25 11.85 10.96     ~ 347 1
53 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 673 2
54 NGC 6482 GiG 17 51 48.8339247888 +23 04 18.889271112 12.71 12.35 11.45     ~ 220 1
55 NGC 7144 GiG 21 52 42.4890937656 -48 15 13.729791132   11.87 10.71 10.39   ~ 156 1
56 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
57 NGC 7507 GiG 23 12 07.595 -28 32 22.70   11.60   9.98   ~ 184 0

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