2008A&A...489..989B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET02:36:29

2008A&A...489..989B - Astronomy and Astrophysics, volume 489, 989-1002 (2008/10-3)

Recent star formation in nearby 3CR radio-galaxies from UV HST observations.

BALDI R.D. and CAPETTI A.

Abstract (from CDS):

We analyzed HST images of 31 nearby (z≲0.1) 3CR radio-galaxies. We compared their UV and optical images to detect evidence of recent star formation. Six objects were excluded because they are highly nucleated or had very low UV count rates. After subtracting the emission from their nuclei and/or jets, 12 of the remaining 25 objects, presenting an UV/optical colors NUV-r<5.4, are potential star-forming candidates. Considering the contamination from other AGN-related processes (UV emission lines, nebular continuum, and scattered nuclear light), there are 6 remaining star-forming ``blue'' galaxies. We then divide the radio galaxies, on the basis of the radio morphology, radio power, and diagnostic optical line ratios, into low and high excitation galaxies, LEG and HEG. While there is no correlation between the FR type (or radio power) and color, the FR type is clearly related to the spectroscopic type. In fact, all HEG (with one possible exception) show morphological evidence of recent star formation in UV compact knots, extended over 5-20kpc. Conversely, there is only 1 ``blue'' LEG out of 19, including in this class also FR I galaxies. The picture that emerges, considering color, UV, optical, and dust morphology, is that only in HEG recent star formation is associated with these relatively powerful AGN, which are most likely triggered by a recent, major, wet merger. Conversely, in LEG galaxies the fraction of actively star-forming objects is not enhanced with respect to quiescent galaxies. The AGN activity in these sources can be probably self-sustained by their hot interstellar medium.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: interactions - galaxies: starburst - ultraviolet: galaxies

Simbad objects: 32

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Number of rows : 32

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 3C 15 BiC 00 37 04.1109920574 -01 09 08.404283613   15.34       ~ 210 1
2 UGC 595 AGN 00 57 34.920 -01 23 27.89   14.07 15.10     ~ 232 1
3 3C 35 QSO 01 12 02.216 +49 28 35.24     15.6     ~ 138 0
4 NGC 547 GiP 01 26 00.577 -01 20 42.43   13.16 13.34     ~ 323 3
5 UGC 1841 Sy1 02 23 11.41124 +42 59 31.3840   15.71 14.81     ~ 533 2
6 NGC 1218 Sy1 03 08 26.2238190 +04 06 39.300921   12.84       ~ 351 1
7 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 861 3
8 2XMM J080535.0+240951 Sy2 08 05 35.0057673498 +24 09 50.334614040   15.46       ~ 317 1
9 3C 198.0 AGN 08 22 31.9519395844 +05 57 06.774647022   18.04 17.33     ~ 122 0
10 2MASX J09474514+0725204 Sy1 09 47 45.1435259633 +07 25 20.596199631   17.37 16.95     ~ 341 0
11 3C 236.0 BLL 10 06 01.7502377 +34 54 10.401469   15.97       ~ 421 2
12 3C 264.0 QSO 11 45 05.0090520 +19 36 22.741257   14.98 13.97     ~ 547 2
13 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1132 0
14 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6351 3
15 2MASX J13211781+4235153 Sy2 13 21 17.813 +42 35 15.38   16.86 16.23     ~ 258 0
16 3C 293.0 BLL 13 52 17.880 +31 26 46.49   16.10 15.10     ~ 430 3
17 NGC 5532 LIN 14 16 52.928 +10 48 26.43   13.3 12.59     ~ 325 3
18 IC 1065 Sy2 14 49 21.5921149894 +63 16 13.816373757   17.30 16.39     ~ 341 1
19 VV 204 AGN 15 04 57.120 +26 00 58.46   15.24       ~ 276 0
20 UGC 9799 Sy2 15 16 44.4894653562 +07 01 17.830884159   15.19 14.17     ~ 421 3
21 3C 321 Sy2 15 31 43.473 +24 04 18.93   16.0   15.40   ~ 310 1
22 3C 326 Rad 15 52 26.60 +20 06 00.0   17.87 17.08     ~ 212 3
23 3C 338.0 QSO 16 28 38.2447110 +39 33 04.233634   12.78 11.78     ~ 713 5
24 3C 346.0 BLL 16 43 48.605 +17 15 49.43   17.2       ~ 250 0
25 2C 1473 AGN 17 20 28.147 -00 58 47.12   15.36       ~ 303 1
26 3C 371 BLL 18 06 50.6803567107 +69 49 28.108152993   14.77 14.22 11.39   ~ 806 2
27 ICRF J183503.3+324146 Sy1 18 35 03.3896681512 +32 41 46.856048508   16.50 15.39 10.50   ~ 593 1
28 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1229 0
29 3C 388.0 SyG 18 44 02.417 +45 33 29.81   16.91 15.56     ~ 307 1
30 UGC 12064 AGN 22 31 20.625 +39 21 29.81   14.6       ~ 422 1
31 3C 452 Sy2 22 45 48.787 +39 41 15.36   17.60 16.56     ~ 344 1
32 NGC 7720 Sy1 23 38 29.38322439 +27 01 53.2583763   13.9 13.3     ~ 516 4

    Equat.    Gal    SGal    Ecl

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2021.03.02-02:36:29

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