2007A&A...468..937H

Query : 2007A&A...468..937H

2007A&A...468..937H - Astronomy and Astrophysics, volume 468937-950 (2007/6-4)

Morphological evolution of z ∼ 1 galaxies from deep K-band AO imaging in the COSMOS deep field.

HUERTAS-COMPANY M., ROUAN D., SOUCAIL G., LE FEVRE O., TASCA L. and CONTINI T.

Abstract (from CDS):

We present the results of an imaging program of distant galaxies (z∼0.8) at high spatial resolution (∼0.1'') aiming at studying their morphological evolution. We observed 7 fields of 1'x1' with the NACO Adaptive Optics system (VLT) in Ks (2.16µm) band with typical V∼14 guide stars and 3h integration time per field. Observed fields are selected within the COSMOS survey area, in which multi-wavelength photometric and spectroscopic observations are ongoing. High angular-resolution K-band data have the advantage of probing old stellar populations in the rest-frame, enabling a determination of galaxy morphological types unaffected by recent star formation, which are more closely linked to the underlying mass than classical optical morphology studies (HST). Adaptive optics on ground based telescopes is the only method today for obtaining such a high resolution in the K-band, but it suffers from limitations since only small fields are observable and long integration times are necessary. In this paper we show that reliable results can be obtained and establish a first basis for larger observing programs. We analyze the morphologies by means of B/D (bulge/disk) decomposition with GIM2D and C-A (concentration-asymmetry) estimators for 79 galaxies with magnitudes between Ks=17-23 and classify them into three main morphological types (late type, early type and irregulars). Automated and objective classification allows precise error estimation. Simulations and comparisons with seeing-limited (CFHT/Megacam) and space (HST/ACS) data are carried out to evaluate the accuracy of adaptive optics-based observations for morphological purposes. We obtain the first estimate of the distribution of galaxy types at redshift z∼1 as measured from the near infrared at high spatial resolution. We show that galaxy parameters (disk scale length, bulge effective radius, and bulge fraction) can be estimated with a random error lower than 20% for the bulge fraction up to Ks=19 (AB=21) and that classification into the three main morphological types can be done up to Ks=20 (AB=22) with at least 70% of the identifications correct. We used the known photometric redshifts to obtain a redshift distribution over 2 redshift bins (z<0.8, 0.8<z<1.5) for each morphological type.

Abstract Copyright: ∼

Journal keyword(s): galaxies: fundamental parameters - galaxies: high-redshift - galaxies: evolution - instrumentation: adaptive optics

VizieR on-line data: <Available at CDS (J/A+A/468/937): table6.dat>

Nomenclature: Table 6: NHzG JHHMMSS.s+DDMMSS N=78.

Simbad objects: 78

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Number of rows : 78
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 COSMOS2015 518399 G 09 59 51.453 +02 05 14.55 23.786 23.61 23.04 22.56 21.916 ~ 10 0
2 NHzG J095951.5+020444 G 09 59 51.5 +02 04 44         23.6728 ~ 1 0
3 NHzG J095952.3+020448 G 09 59 52.3 +02 04 48           ~ 1 0
4 NHzG J095952.3+020458 G 09 59 52.3 +02 04 58           ~ 1 0
5 NHzG J095952.3+020459 G 09 59 52.3 +02 04 59           ~ 1 0
6 COSMOS J095953.06+020446.8 G 09 59 53.0 +02 04 46         23.9269 ~ 1 0
7 NHzG J095953.9+020507 G 09 59 53.9 +02 05 07         23.2931 ~ 1 0
8 NHzG J095955.6+020419 G 09 59 55.6 +02 04 19         22.7710 ~ 1 0
9 NHzG J095955.6+020420 G 09 59 55.6 +02 04 20         22.4354 ~ 1 0
10 NHzG J095955.7+020404 G 09 59 55.7 +02 04 04         23.8483 ~ 1 0
11 NHzG J095955.8+020358 G 09 59 55.8 +02 03 58         23.8229 ~ 1 0
12 NHzG J095955.8+020412 G 09 59 55.8 +02 04 12         23.4010 ~ 1 0
13 COSMOS2015 506898 G 09 59 55.832 +02 04 07.13         22.0782 ~ 5 0
14 COSMOS2015 504315 G 09 59 56.22 +02 03 52.8 24.72 24.29 23.54 22.97 22.234 ~ 5 0
15 COSMOS 1288608 G 09 59 56.2272 +02 04 01.144           ~ 3 0
16 NHzG J095956.4+020412 G 09 59 56.4 +02 04 12           ~ 1 0
17 NHzG J095956.4+020416 G 09 59 56.4 +02 04 16         22.3323 ~ 1 0
18 COSMOS2015 502310 G 09 59 56.4216 +02 03 52.672         23.8900 ~ 3 0
19 COSMOS2015 503759 G 09 59 56.554 +02 03 55.48 25.65 25.13 24.18 23.28 22.28 ~ 9 0
20 NHzG J095956.7+020421 G 09 59 56.7 +02 04 21         22.7361 ~ 1 0
21 NHzG J095956.8+020406 G 09 59 56.8 +02 04 06         23.9523 ~ 1 0
22 NHzG J095956.8+020423 G 09 59 56.8 +02 04 23         23.6537 ~ 2 0
23 COSMOS2015 501400 AGN 09 59 57.30 +02 03 47.1         23.8017 ~ 9 0
24 COSMOS2015 536438 BiC 10 00 00.9144 +02 06 52.497         20.6107 ~ 6 0
25 COSMOS2015 536535 G 10 00 00.91 +02 07 01.0 26.59 25.95 25.00 23.94 22.95 ~ 4 0
26 COSMOS2015 537900 G 10 00 01.765 +02 07 04.05         18.8229 ~ 7 0
27 NHzG J100002.1+020635 G 10 00 02.1 +02 06 35           ~ 1 0
28 NHzG J100002.1+020650 G 10 00 02.1 +02 06 50         21.3752 ~ 1 0
29 COSMOS2015 533180 G 10 00 02.230 +02 06 41.11 23.883 23.57 22.66 22.44 22.183 ~ 9 0
30 NHzG J100002.5+020701 G 10 00 02.5 +02 07 01           ~ 1 0
31 NHzG J100002.6+020659 G 10 00 02.6 +02 06 59           ~ 1 0
32 COSMOS2015 535951 G 10 00 03.153 +02 06 48.15         21.9584 ~ 5 0
33 NHzG J100003.2+020700 G 10 00 03.2 +02 07 00         22.2691 ~ 1 0
34 COSMOS2015 532682 G 10 00 03.2076 +02 06 42.322         23.4545 ~ 2 0
35 NHzG J100003.4+020711 G 10 00 03.4 +02 07 11         22.3691 ~ 1 0
36 NHzG J100003.6+020706 G 10 00 03.6 +02 07 06         22.4869 ~ 1 0
37 COSMOS2015 529063 G 10 00 09.7296 +02 06 10.133           ~ 3 0
38 COSMOS J100010.03+020624.5 G 10 00 10.0 +02 06 24         22.7680 ~ 1 0
39 COSMOS 1279409 G 10 00 10.26 +02 06 13.4           ~ 8 0
40 NHzG J100010.6+020612 G 10 00 10.6 +02 06 12           ~ 1 0
41 ACS-GC 20066960 Sy2 10 00 11.19 +02 06 29.3 23.064 22.59 21.570 21.055 20.503 ~ 28 0
42 COSMOS2015 531036 G 10 00 11.623 +02 06 17.65 23.358 22.94 22.05 21.872 21.509 ~ 7 0
43 NHzG J100013.8+020838 G 10 00 13.8 +02 08 38         22.7827 ~ 1 0
44 NHzG J100013.9+020903 G 10 00 13.9 +02 09 03         23.5968 ~ 1 0
45 NHzG J100013.9+020920 G 10 00 13.9 +02 09 20           ~ 1 0
46 COSMOS2015 561880 G 10 00 13.9296 +02 09 09.206         22.7981 ~ 3 0
47 COSMOS J100014.04+020920.4 G 10 00 14.0 +02 09 19         23.5849 ~ 1 0
48 NHzG J100014.1+020918 G 10 00 14.1 +02 09 18         23.5148 ~ 1 0
49 COSMOS 1603072 G 10 00 14.7360 +02 16 30.030         23.3978 ~ 7 0
50 NHzG J100014.8+021624 G 10 00 14.8 +02 16 24           ~ 1 0
51 COSMOS 1603073 G 10 00 14.82056 +02 16 29.8441         23.7523 ~ 4 0
52 COSMOS2015 640895 G 10 00 14.916 +02 16 07.63 26.76 26.07 24.58 23.56 22.42 ~ 13 0
53 COSMOS2015 638671 G 10 00 14.93042 +02 16 03.5413         22.7490 ~ 3 0
54 NHzG J100015.0+021629 G 10 00 15.0 +02 16 29           ~ 1 0
55 NHzG J100015.1+020915 G 10 00 15.1 +02 09 15           ~ 1 0
56 NHzG J100015.3+020923 G 10 00 15.3 +02 09 23         21.1499 ~ 1 0
57 COSMOS2015 557587 G 10 00 15.4128 +02 08 54.385         23.9274 ~ 3 0
58 NHzG J100015.9+021629 G 10 00 15.9 +02 16 29         22.6455 ~ 1 0
59 COSMOS2015 556926 G 10 00 16.13 +02 08 54.0 27.62 26.92 26.95 26.53 25.68 ~ 4 0
60 COSMOS 1602651 G 10 00 16.28906 +02 16 44.0208         22.4291 ~ 4 0
61 COSMOS2015 644975 G 10 00 16.35 +02 16 32.5         24.2207 ~ 3 0
62 ACS-GC 20092409 AGN 10 00 16.396 +02 09 12.54         23.0442 ~ 9 0
63 CANDELS COSMOS F160W J100016.43+021555.7 G 10 00 16.435 +02 15 55.71 24.99 24.57 23.64 22.95 21.830 ~ 25 0
64 COSMOS2015 636042 EmG 10 00 16.662 +02 16 18.76       19.85 20.9238 ~ 7 0
65 NHzG J100016.7+021610 G 10 00 16.7 +02 16 10         22.7999 ~ 1 0
66 COSMOS 1602969 G 10 00 17.17896 +02 16 37.9096         24.1406 ~ 5 0
67 NHzG J100017.2+021624 G 10 00 17.2 +02 16 24         23.4449 ~ 1 0
68 COSMOS 1604043 G 10 00 17.285 +02 16 20.46         22.36 ~ 9 0
69 NHzG J100017.3+021601 G 10 00 17.3 +02 16 01         23.8199 ~ 1 0
70 NHzG J100050.8+022002 G 10 00 50.8 +02 20 02         21.8439 ~ 1 0
71 COSMOS2015 684660 G 10 00 50.830 +02 20 00.57 22.959 22.57 21.462 21.090 20.635 ~ 11 0
72 COSMOS2015 680582 G 10 00 51.01 +02 19 42.8 23.95 23.56 22.79 22.31 21.431 ~ 13 0
73 NHzG J100051.8+022006 G 10 00 51.8 +02 20 06         23.6353 ~ 1 0
74 COSMOS 1990208 EmG 10 00 51.9 +02 20 11         22.6407 ~ 2 0
75 2XMM J100051.9+021943 AGN 10 00 51.960 +02 19 44.12         20.8672 ~ 16 0
76 COSMOS J100052.07+022009.2 G 10 00 52.0 +02 20 08         21.9404 ~ 1 0
77 NHzG J100052.4+021941 G 10 00 52.4 +02 19 41         22.7814 ~ 1 0
78 COSMOS2015 677778 G 10 00 53.24 +02 19 34.2 24.69 24.46 23.51 23.11 22.043 ~ 11 0

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