2007AJ....134..321P

Query : 2007AJ....134..321P

2007AJ....134..321P - Astron. J., 134, 321-333 (2007/July-0)

Hδ in the integrated light of galaxies: what are we actually measuring?

PROCHASKA L.C., ROSE J.A., CALDWELL N., CASTILHO B.V., CONCANNON K., HARDING P., MORRISON H. and SCHIAVON R.P.

Abstract (from CDS):

We present a cautionary study exploring the reliability of the Hδ line in the integrated spectra of galaxies for determining galaxy ages. Our database consists of the observed integrated spectra of ∼120 early-type galaxies, 7 metal-rich globular clusters in M31 and the Galactic globular cluster 47 Tuc, and the open cluster M67. We have measured Hδ using index definitions designed to assess contamination from the CN molecule in and around Hδ by choosing combinations of bandpasses that both avoid and include a region of CN molecular lines redward of Hδ. We find systematic differences in the ages derived from Hδ measurements among the various definitions when extracting ages from Hδ in old stellar populations with enhanced CN bands due to nonsolar abundance ratios. We propose that neighboring CN lines have a strong effect on pseudocontinuum and central bandpass levels. For stellar populations that have nonsolar abundance ratios in C and/or N, population synthesis models that do not account for abundance ratio variations cannot accurately reproduce the CN 4216 Å band, which leads to a corresponding inaccuracy in reproducing the various Hδ indices. Hence, caution must be used when extracting galaxy ages from the Hδ line in old stellar populations with significant nonsolar abundance ratios.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Evolution - Galaxies: Stellar Content

VizieR on-line data: <Available at CDS (J/AJ/134/321): table1.dat table2.dat>

CDS comments: Table 2 : A00368p25 = Z 479-55, A10025 = Z 290-8, A 15572p48 = Z 250-30, 123302p29 = Z 497-36, A6004p16 = Z 1604.4+1627

Simbad objects: 131

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Number of rows : 131
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 183 GiG 00 38 29.3903442696 +29 30 40.096025424   13.8       ~ 45 0
3 Z 479-55 GiG 00 39 29.5903963776 +25 38 36.048567804   14.5       ~ 30 0
4 Bol 112 GlC 00 42 33.2479026840 +41 17 42.339523488 18.56 17.506 16.450 15.795 15.220 ~ 57 0
5 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
6 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
7 Bol 143 GlC 00 42 59.6426520720 +41 19 19.253372304 17.800 17.075 16.087 15.486 14.94 ~ 84 0
8 Bol 150 GlC 00 43 07.51 +41 20 19.8 18.275 17.644 16.665 16.059 15.508 ~ 46 0
9 Bol 163 GlC 00 43 17.6311962552 +41 27 44.994405276 16.77 16.030 15.00 14.430 13.87 ~ 80 0
10 Bol 171 GlC 00 43 25.6003962624 +41 15 37.095704604 16.795 16.192 15.217 14.635 14.07 ~ 75 0
11 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 543 1
12 Bol 189 GlC 00 43 42.4008472440 +41 35 23.338194144 18.868 17.997 17.004 16.340 15.638 ~ 36 0
13 Bol 193 GlC 00 43 45.4998657576 +41 36 57.605146668 16.746 16.097 15.193 14.565 14.18 ~ 89 0
14 NGC 448 EmG 01 15 16.5193587096 -01 37 34.484096784   13.2       ~ 112 0
15 NGC 474 GiP 01 20 06.6870520512 +03 24 55.861973100 12.75 12.37 11.51 11.42 10.56 ~ 371 1
16 Z 411-29 G 01 21 08.5309607376 +05 08 26.397920796   15.7       ~ 10 0
17 NGC 502 GiG 01 22 55.5578695992 +09 02 57.040303668   13.8       ~ 91 0
18 NGC 516 GiP 01 24 08.0801760720 +09 33 06.397815780   14.3       ~ 85 0
19 NGC 525 AG? 01 24 52.9229678784 +09 42 12.149984916   14.50       ~ 68 0
20 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 417 2
21 NGC 636 EmG 01 39 06.5293238064 -07 30 45.475975296   12.5       ~ 196 0
22 HD 10307 SB* 01 41 47.1268541099 +42 36 48.221567818 5.69 5.58 4.96 4.43 4.10 G1V 523 0
23 NGC 656 AG? 01 42 27.2530437960 +26 08 34.971347724   13.50       ~ 48 0
24 NGC 770 GiP 01 59 13.6426514184 +18 57 16.714843308   13.91 13.49     ~ 111 1
25 NGC 774 LIN 01 59 34.7353817064 +14 00 29.546396964   13.97       ~ 85 1
26 IC 195 GiP 02 03 44.6075361096 +14 42 33.441262236   14.3       ~ 70 0
27 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 592 0
28 NGC 938 GiG 02 28 33.5195261688 +20 17 01.358927304   13.8       ~ 58 0
29 NGC 990 GiG 02 36 18.206 +11 38 31.57   13.9       ~ 47 0
30 NGC 1026 AG? 02 39 19.2009213936 +06 32 38.531603472   14.1       ~ 41 0
31 NGC 1029 GiP 02 39 36.5358324432 +10 47 35.712677904   14.20 13.11 12.47 11.52 ~ 50 0
32 NGC 1107 AG? 02 49 19.5973326936 +08 05 33.778409316   14.1       ~ 36 0
33 NGC 1153 AG? 02 58 10.3205584152 +03 21 43.041632292   13.5       ~ 40 0
34 NGC 1211 AG? 03 06 52.4204985720 -00 47 40.073141400   13.3   13.2 12.6 ~ 88 0
35 NGC 1298 GiG 03 20 13.0777329888 -02 06 50.671674648   14.2       ~ 50 1
36 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
37 NGC 2880 GiG 09 29 34.5699581472 +62 29 26.020090572   12.6       ~ 166 0
38 IC 555 GiG 09 41 56.8907047800 +12 17 46.580080452   14.4       ~ 35 0
39 NGC 2950 AG? 09 42 35.1484995048 +58 51 04.584956904   11.8       ~ 223 0
40 NGC 3102 GiG 10 04 31.7648115648 +60 06 28.610881308   14.30       ~ 52 0
41 Z 290-8 GiG 10 05 59.9914143792 +58 48 43.947429912   13.6       ~ 28 0
42 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 301 1
43 NGC 3248 GiG 10 27 45.4389454896 +22 50 49.805614320   13.9       ~ 83 0
44 NGC 3266 GiG 10 33 17.6098160184 +64 44 57.720597360   13.5       ~ 68 0
45 NGC 3524 GiP 11 06 32.1025569504 +11 23 07.539947340   13.4       ~ 45 0
46 NGC 3648 GiG 11 22 31.5070422432 +39 52 36.753613320   13.57 12.64     ~ 84 0
47 NGC 3731 LIN 11 34 11.6735853360 +12 30 44.367759108   14.3       ~ 41 0
48 NGC 3757 GiG 11 37 02.8650138288 +58 24 55.817369748   13.5       ~ 87 0
49 NGC 3818 EmG 11 41 57.3563891040 -06 09 20.459153376   13   11.78   ~ 186 0
50 IC 3065 GiG 12 15 12.5592175920 +14 25 58.469336508   14.7       ~ 109 0
51 IC 781 GiG 12 20 03.2942086416 +14 57 41.415572916   14.8       ~ 72 0
52 NGC 4283 GiG 12 20 20.7691223880 +29 18 39.154727556 13.47 13.00 12.07     ~ 209 1
53 NGC 4308 GiG 12 21 56.8514262840 +30 04 27.609537504   14.3       ~ 90 0
54 NGC 4306 GiP 12 22 04.087 +12 47 13.96   14.4       ~ 113 0
55 NGC 4309A GiP 12 22 14.7398629440 +07 10 01.648488468           ~ 70 0
56 NGC 4350 GiP 12 23 57.814 +16 41 36.08   11.5 11.08     ~ 331 0
57 NGC 4352 GiG 12 24 05.0220445416 +11 13 05.086056576   14.0       ~ 174 0
58 IC 3292 GiG 12 24 48.3555488664 +18 11 42.410950008   15.5       ~ 90 0
59 NGC 4370 GiG 12 24 54.932 +07 26 40.44 16.09 15.59 13.84     ~ 148 0
60 NGC 4379 GiG 12 25 14.7458757864 +15 36 26.755074576 13.05 12.63 11.72     ~ 239 1
61 NGC 4387 GiG 12 25 41.6768484264 +12 48 37.804615956 13.42 13.01 12.12   10.87 ~ 409 1
62 IC 3328 GiP 12 25 57.9238048368 +10 03 13.552350912   14.9       ~ 172 0
63 NGC 4415 GiG 12 26 40.4842511880 +08 26 08.595255480   14.2       ~ 120 0
64 NGC 4417 GiP 12 26 50.6084412168 +09 35 03.354168804   12.2       ~ 268 0
65 NGC 4421 GiG 12 27 02.5337064504 +15 27 41.371676640 12.81 12.47 11.60     ~ 120 1
66 NGC 4431 GiP 12 27 27.3817521552 +12 17 25.041554808 14.17 13.74 12.89     ~ 171 2
67 NGC 4434 GiG 12 27 36.6771662112 +08 09 15.640206876   13.2       ~ 275 0
68 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 474 2
69 NGC 4436 GiP 12 27 41.2343736168 +12 18 57.193481304 14.20 13.91 12.98     ~ 138 1
70 NGC 4442 GiG 12 28 03.8815318272 +09 48 13.426522272   11.2       ~ 298 0
71 IC 794 GiG 12 28 08.6096744256 +12 05 35.874205512   14.07 13.44   12.39 ~ 121 1
72 NGC 4452 GiG 12 28 43.2980346552 +11 45 18.201826692 13.27 12.87 11.98     ~ 215 1
73 NGC 4458 GiP 12 28 57.5613938232 +13 14 30.946545276 13.27 12.93 12.07     ~ 429 2
74 NGC 4464 GiG 12 29 21.2937802368 +08 09 23.807609316   13.5       ~ 242 0
75 IC 3413 GiG 12 29 22.5171098280 +11 26 01.955382504   15.2       ~ 82 0
76 LEDA 41180 AG? 12 29 34.9891966080 +08 03 28.781563608           ~ 91 0
77 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 671 1
78 NGC 4474 GiG 12 29 53.5396737408 +14 04 06.881708604   12.6       ~ 278 0
79 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 508 1
80 NGC 4479 GiG 12 30 18.3716396496 +13 34 39.522722196 13.73 13.40 12.44     ~ 197 2
81 NGC 4486B GiG 12 30 31.985 +12 29 24.85   14.5       ~ 428 0
82 NGC 4483 GiG 12 30 40.6442816856 +09 00 56.391019596   13.4       ~ 179 0
83 NGC 4488 GiG 12 30 51.3727669680 +08 21 35.998048692   13.8       ~ 101 0
84 NGC 4489 GiG 12 30 52.2472748976 +16 45 31.866359004   13.2       ~ 264 0
85 IC 3468 GiG 12 32 14.2119323256 +10 15 05.173970472   14.6       ~ 148 0
86 IC 798 GiG 12 32 33.4026417888 +15 24 55.432700280   15.3       ~ 108 0
87 NGC 4515 GiG 12 33 04.9652329656 +16 15 55.889535096   13.3       ~ 157 0
88 IC 3499 GiG 12 33 44.9919553104 +10 59 44.614881240   14.5       ~ 70 0
89 NGC 4528 GiG 12 34 06.0685723920 +11 19 16.528093428 13.39 12.97 12.06     ~ 201 1
90 IC 3509 GiG 12 34 11.5324571232 +12 02 56.163023196   15.3       ~ 125 0
91 NGC 4551 GiP 12 35 37.9542692328 +12 15 50.284593432 13.49 12.97 12.02     ~ 371 1
92 NGC 4598 GiG 12 40 11.9356455312 +08 23 01.483673064   14.1       ~ 70 0
93 IC 3653 GiG 12 41 15.7273825296 +11 23 13.997694300   14.7       ~ 122 0
94 NGC 4648 GiG 12 41 44.3891511144 +74 25 15.700353240   12.6       ~ 125 0
95 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 721 0
96 NGC 4638 GiP 12 42 47.4239240016 +11 26 32.970950556   12.2 11.23     ~ 295 1
97 NGC 4660 GiP 12 44 31.9814021280 +11 11 25.739106972   12.1       ~ 434 0
98 IC 3773 GiG 12 47 15.2968038432 +10 12 12.944157012   14.3       ~ 142 0
99 NGC 5342 GiG 13 51 25.898 +59 51 46.85   14.4       ~ 68 0
100 NGC 5370 LIN 13 54 09.3709053024 +60 40 40.949916888   14.3       ~ 58 0
101 NGC 5424 GiG 14 02 55.7022079632 +09 25 14.475840672   14.3       ~ 79 1
102 NGC 5459 AG? 14 05 00.1861428336 +13 07 54.829119900   14.5       ~ 41 0
103 NGC 5481 AG? 14 06 41.2682134344 +50 43 23.823257124   13.5       ~ 136 0
104 NGC 5500 GiG 14 10 15.2332280184 +48 32 46.013176572   14.5       ~ 72 0
105 NGC 5582 GiP 14 20 43.1108121696 +39 41 36.927369816   13.0       ~ 128 0
106 NGC 5576 GiP 14 21 03.691 +03 16 15.78 12.25 11.85 10.96     ~ 347 1
107 NGC 5590 GiG 14 21 38.4096020760 +35 12 17.499866256   13.6       ~ 59 1
108 NGC 5611 AG? 14 24 04.7758256208 +33 02 50.707920444   13.5       ~ 94 0
109 NGC 5770 GiG 14 53 15.0128865696 +03 57 35.024994900 13.49 13.15 12.26     ~ 109 1
110 NGC 5831 GiG 15 04 07.0002600408 +01 13 11.705607012   13.1   11.19   ~ 304 0
111 NGC 5845 GiG 15 06 00.7823239488 +01 38 01.704838596   13.8 11.20 12.06 9.94 ~ 403 0
112 NGC 5865 GiP 15 09 49.4195561280 +00 28 12.385857792   13.5       ~ 99 0
113 NGC 6003 GiG 15 49 25.6424078208 +19 01 55.476683436   14.4       ~ 44 0
114 Z 250-30 GiG 15 58 40.2287387232 +48 40 56.693834040   14.3       ~ 34 0
115 NGC 6030 GiG 16 01 51.4174712664 +17 57 26.915090976   14.5       ~ 43 0
116 Z 108-150 GiG 16 06 42.0913690032 +16 19 10.605201636   14.3       ~ 39 0
117 IC 1211 AG? 16 16 51.9794910072 +53 00 21.703117284   13.80       ~ 60 0
118 NGC 6126 GiG 16 21 27.9256198560 +36 22 35.826504132   14.5       ~ 33 0
119 NGC 7280 GiP 22 26 27.5758899936 +16 08 53.421593496   13.6       ~ 169 0
120 NGC 7391 EmG 22 50 36.1354224576 -01 32 41.420188356   13.7       ~ 69 0
121 NGC 7454 GiG 23 01 06.5120307216 +16 23 18.484008792   13.6       ~ 157 0
122 NGC 7461 AG? 23 01 48.3342056808 +15 34 57.265786776   14.5       ~ 49 0
123 UGC 12454 GrG 23 15 09.25 +09 40 45.8   15.0       ~ 15 0
124 NGC 7557 GiP 23 15 39.7623297912 +06 42 29.924345880   15.0       ~ 43 0
125 NGC 7611 GiG 23 19 36.5915702280 +08 03 48.102500664   14.0       ~ 77 0
126 NGC 7612 GiG 23 19 44.2115813880 +08 34 34.873328280   14.3       ~ 56 0
127 NGC 7623 GiG 23 20 30.0039351816 +08 23 44.814596208   13.9       ~ 88 0
128 Z 497-36 GiG 23 32 43.4912105376 +29 27 38.433171780   14.5       ~ 30 0
129 NGC 7698 G 23 34 01.5623037528 +24 56 40.699353732   14.5       ~ 27 0
130 NGC 7703 GiG 23 34 46.8800843088 +16 04 32.585386764   14.8       ~ 34 0
131 NGC 7711 GiG 23 35 39.3728741856 +15 18 07.098903144   14.0       ~ 79 0

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