2013A&A...549A.144B


Query : 2013A&A...549A.144B

2013A&A...549A.144B - Astronomy and Astrophysics, volume 549A, 144-144 (2013/1-1)

Multi-band constraints on the nature of emission line galaxies.

BALMAVERDE B. and CAPETTI A.

Abstract (from CDS):

Our aim is to explore the nature of emission line galaxies by combining high-resolution observations obtained in different bands to understand which objects are powered by an active galactic nucleus (AGN). From the spectroscopic Palomar survey of nearby bright galaxies, we selected a sample of 18 objects observed with Hubble Space Telescope (HST), Chandra, and Very Large Array (VLA). No connection is found between X-ray and emission line luminosities from ground-based data, unlike what is found for brighter AGN. Conversely, a strong correlation emerges when using the HST spectroscopic data, which are extracted on a much smaller aperture. This suggests that the HST data better isolate the AGN component when one is present, while ground-based line measurements are affected by diffuse emission from the host galaxies. The sample separates into two populations. The 11 objects belonging to the first class have an equivalent width (EW) of the [O III] emission line measured from HST data EW[OIII]>2Å and are associated with an X-ray nuclear source; in the second group we find seven galaxies with EW[OIII]≲1Å that generally do not show any emission related to an active nucleus (emission lines, X-ray, or radio sources). This latter group includes about half of the low ionization nuclear emission-line region or transition galaxies of the sample, all of which are objects of low [OIII] line luminosity (≲1038erg/s) and low equivalent width (≲1Å) in ground-based observations. These results strengthen the suggestion that the EW[OIII] value is a robust predictor of the nature of an emission line galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: ISM - X-rays: galaxies - radio continuum: galaxies

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 2787 LIN 09 19 18.6046606656 +69 12 11.630716128   12.92 11.79     ~ 335 0
2 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 790 1
3 NGC 3489 GiG 11 00 18.5483994744 +13 54 04.206202668 11.46 11.12 10.29     ~ 385 1
4 NGC 3982 Sy1 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 522 1
5 M 109 GiG 11 57 35.9631479640 +53 22 29.006082336   10.94   9.57   ~ 439 0
6 NGC 4143 LIN 12 09 36.0679174440 +42 32 03.031963368   13.04 12.08     ~ 225 0
7 NGC 4203 LIN 12 15 05.0549203560 +33 11 50.383965120   12.98 11.99     ~ 477 2
8 NGC 4314 LIN 12 22 32.0223000912 +29 53 43.814812200 11.72 11.43 10.58     ~ 470 1
9 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1762 2
10 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 431 2
11 NGC 4450 LIN 12 28 29.5910654016 +17 05 05.976112020   10.90 10.08     ~ 540 2
12 NGC 4459 H2G 12 29 00.0329905416 +13 58 42.826603332   11.6       ~ 522 0
13 NGC 4477 Sy2 12 30 02.1955766304 +13 38 11.543715888 11.98 11.38 10.42     ~ 386 2
14 M 88 Sy2 12 31 59.1525062448 +14 25 13.148971824   14.33 13.18     ~ 771 1
15 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 569 0
16 NGC 4596 GiP 12 39 55.9544722920 +10 10 34.185047628   12.4       ~ 353 0
17 NGC 4698 Sy2 12 48 22.9082830584 +08 29 14.667552276   13.24 12.27     ~ 468 0
18 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1166 2

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2023.01.27-11:17:26

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