2013A&A...552A..34T


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET17:46:05

2013A&A...552A..34T - Astronomy and Astrophysics, volume 552A, 34-34 (2013/4-1)

Detection of ammonia in M 51.

TAKANO S., TAKANO T., NAKAI N., KAWAGUCHI K. and SCHILKE P.

Abstract (from CDS):

To study the abundance and temperature of ammonia in the center of a nearby galaxy M51 and to compare them with those in other nearby galaxies, we observed its (J,K)=(1,1), (2,2), (3,3), and (4,4) inversion transitions at the wavelength of 1.3cm. The observations were carried out with the Effelsberg 100-m radio telescope. The (1,1), (2,2), and (3,3) transitions are clearly detected, but the (4,4) transition is barely detected. The rotational temperature obtained from the (1,1) and (2,2) transitions of para-ammonia is 25±2K, which is similar to those of M82 and the Large Magellanic Cloud (N 159 W), but significantly lower than those of IC342 and NGC1068 among the nearby galaxies. The column density of ammonia is (8.1±2.4)x1013cm2, and the abundance relative to H2 is ∼4.5x10–9. The abundance in M51 is about a factor of 5 lower than those of NGC253 and IC342, but about one order of magnitude higher than those of M82 and the Large Magellanic Cloud. The addition of the data of M51 further supports the exceptionally low abundances of ammonia reported previously in these two galaxies. For understanding the abundance of ammonia in M51 and other nearby galaxies, their temperatures were compared. As a result, we found that the galaxies with low temperature tend to have low abundance of ammonia. In addition, the photodissociation rate of ammonia was compared to those of related molecules detected in the nearby galaxies to discuss the effect of photodissociation. We found that the low abundance of ammonia in some galaxies cannot be explained only by the effect of photodissociation.

Abstract Copyright:

Journal keyword(s): local insterstellar matter - molecular processes - ISM: molecules - ISM: abundances

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2868 2
2 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 489 3
3 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 317 1
4 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3998 2
5 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1364 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14380 1
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1680 2
8 LHA 120-N 159W MoC 05 39 32.510 -69 46 02.74           ~ 68 0
9 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5236 6
10 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3904 3
11 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3696 4
12 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3626 1
13 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2629 4
14 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11082 0
15 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 538 6

    Equat.    Gal    SGal    Ecl

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2019.12.10-17:46:05

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