2012MNRAS.421.1421E


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST15:24:21

2012MNRAS.421.1421E - Mon. Not. R. Astron. Soc., 421, 1421-1430 (2012/April-1)

Classical radio source propagating into outer H I disc in NGC 3801.

EMONTS B.H.C., BURNETT C., MORGANTI R. and STRUVE C.

Abstract (from CDS):

We present observations of a large-scale disc of neutral hydrogen (H I) in the nearby Fanaroff–Riley type I (FR I) radio galaxy NGC 3801 with the Westerbork Synthesis Radio Telescope. The H I disc (34 kpc in diameter and with MHi = 1.3 x 109M) is aligned with the radio jet axis. This makes NGC 3801 an ideal system for investigating the evolution of a small radio source through its host galaxy's cold interstellar medium (ISM). The large-scale H I disc is perpendicular to a known inner CO disc and dust lane. We argue that the formation history of the large-scale H I disc is in agreement with earlier speculation that NGC 3801 was involved in a past gas-rich galaxy–galaxy merger (although other formation histories are discussed). The fact that NGC 3801 is located in an environment of several H I-rich companions, and shows indications of ongoing interaction with the nearby companion NGC 3802, strengthens this possibility. The large amounts of ambient cold ISM, combined with X-ray results by Croston, Kraft & Hardcastle on the presence of overpressured radio jets and evidence for an obscuring torus, are properties that are generally not, or no longer, associated with more evolved FR I radio sources. We do show, however, that the H I properties of NGC 3801 are comparable to those of a significant fraction of nearby low-power compact radio sources, suggesting that studies of NGC 3801 may reveal important insight into a more general phase in the evolution of at least a significant fraction of nearby radio galaxies.

Abstract Copyright: 2012 CSIRO Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: individual: NGC 3801 - galaxies: interactions - galaxies: ISM - galaxies: jets

Nomenclature: Fig. 5, Table 2: [EBM2012] Cloud A (Nos A-B).

CDS comments: Clump C in NGC 3801 is not in Simbad.

Simbad objects: 20

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Number of rows : 20

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 NGC 1167 LIN 03 01 42.358 +35 12 20.34   13.84 12.77     ~ 309 2
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1314 1
3 NVSS J072537+295714 rG 07 25 37.258 +29 57 14.79   15.60       ~ 78 2
4 NGC 2685 Sy2 08 55 34.7056265191 +58 44 03.877798862   13.68 12.70     ~ 410 1
5 NGC 3790 LIN 11 39 47.223 +17 42 43.83   14.5       ~ 36 0
6 MCG+03-30-035 GiC 11 40 05.694 +17 41 36.51   16       ~ 12 0
7 [EBM2012] Cloud A HI 11 40 10.00 +17 37 48.0           ~ 1 0
8 SDSS J114011.27+174846.6 G 11 40 11.272 +17 48 46.59           ~ 1 0
9 NGC 3801 LIN 11 40 16.897 +17 43 40.48   13.3       ~ 189 1
10 NGC 3802 GiG 11 40 19.069 +17 45 56.46   14.7       ~ 42 0
11 [EBM2012] Cloud B HI 11 40 38.00 +17 50 45.0           ~ 1 0
12 NGC 3806 LSB 11 40 46.619 +17 47 46.84   14.6       ~ 36 0
13 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6036 0
14 ESO 322-69 GiG 12 44 49.0359408961 -40 42 51.693581748   14.12 13.58 13.29 13.9 ~ 188 0
15 3C 277.3 BLL 12 54 12.052 +27 37 34.15   15.94       ~ 347 1
16 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4096 3
17 NGC 5266 GiG 13 43 02.120 -48 10 09.77   11.89 11.14 11.9 11.3 ~ 158 0
18 UGC 9796 GiP 15 15 56.3062498632 +43 10 00.479663780   16.0       ~ 42 0
19 ICRF J181935.0-634548 Sy2 18 19 35.00241 -63 45 48.1926   16.80 14.40 13.4   ~ 138 1
20 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 568 1

    Equat.    Gal    SGal    Ecl

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