2017A&A...602A..31C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST19:32:29

2017A&A...602A..31C - Astronomy and Astrophysics, volume 602A, 31-31 (2017/6-1)

Radio and X-ray properties of the source G29.37+0.1 linked to HESS J1844-030.

CASTELLETTI G., SUPAN L., PETRIELLA A., GIACANI E. and JOSHI B.C.

Abstract (from CDS):

Aims. We report on the first detailed multiwavelength study of the radio source G29.37+0.1, which is an as-yet-unclassified object linked to the very-high-energy γ-emitting source HESS J1844-030. The origin of the multiwavelength emission toward G29.37+0.1 has not been clarified so far, leaving open the question about the physical relationship between these sources.
Methods. Using observations carried out with the Giant Metrewave Radio Telescope (GMRT), we performed high-quality full-synthesis imaging at 610 MHz of the field containing G29.37+0.1. The obtained data, combined with observations at 1400 MHz from The Multi-Array Galactic Plane Imaging Survey (MAGPIS) were used to investigate in detail the properties of its radio emission. Additionally, we reprocessed archival data obtained with the XMM-Newton and Chandra observatories in order to get a multiwavelength view of this unusual source.
Results. The radio source G29.37+0.1 mainly consists of a bright twisted structure, named the S-shaped feature. The high sensitivity of the new GMRT observations allowed the identification of potential lobes, jets, and a nuclear central region in the S-shaped morphology of G29.37+0.1. We also highlight the detection of diffuse and low surface brightness emission enveloping the brightest emitting regions. The brightest emission in G29.37+0.1 has a radio synchrotron spectral index α=0.59±0.09. Variations in the spectral behaviour are observed across the whole radio source with the flattest spectral features in the central nuclear and jets components (α∼0.3). These results lead us to conclude that the brightest radio emission from G29.37+0.1 likely represents a newly recognized radio galaxy. The identification of optical and infrared counterparts to the emission arising from the core of G29.37+0.1 strengthens our interpretation of an extragalactic origin of the radio emission. We performed several tests to explain the physical mechanism responsible for the observed X-ray emission, which appears overlapping the northeastern part of the radio emission. Our spectral analysis demonstrated that a non-thermal origin for the X-ray emission compatible with a pulsar wind nebula is quite possible. The analysis of the spatial distribution of the CO gas revealed the presence of a complex of molecular clouds located in projection adjacent to the radio halo emission and probably interacting with it. We propose that the faint halo represents a composite supernova remnant with a pulsar powered component given by the diffuse X-ray emission superimposed along the line of sight to the radio galaxy. Further broadband observations of HESS J1844-030 are needed to disentangle its origin, although its shape and position suggest an extragalactic origin connected to G29.37+0.1.

Abstract Copyright: © ESO, 2017

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

VizieR on-line data: <Available at CDS (J/A+A/602/A31): list.dat G29.37-AA.SUBIM.fits>

CDS comments: Fig.11, Table 6 Clouds not in SIMBAD.

Simbad objects: 17

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Number of rows : 17

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 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2577 2
2 3C 183 rG 07 35 22.4534192750 +43 44 25.039803733           ~ 48 1
3 7C 093653.10+360601.00 Sy2 09 39 52.7593482853 +35 53 58.921088539   19.51 18.60     ~ 258 1
4 7C 094437.60+732735.00 Sy2 09 49 45.967 +73 14 23.25   16.00   11.7   ~ 99 1
5 NVSS J121158+741904 rG 12 11 58.594 +74 19 03.87           ~ 23 0
6 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6388 3
7 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4090 3
8 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3859 2
9 ARGO J1841-0332 gam 18 43 48.39120 -03 33 14.7670           ~ 17 0
10 MAGPIS SNR? G29.3667+0.1000 SR? 18 44 34.3 -03 07 37           ~ 5 0
11 PMN J1844-0306 Rad 18 44 36.4 -03 06 30           ~ 8 0
12 HESS J1844-030 gam 18 44 40.0 -03 06 00           ~ 6 0
13 3XMM J184441.9-030550 X 18 44 41.94 -03 05 50.7           ~ 2 0
14 3XMM J184442.9-030525 X 18 44 42.96 -03 05 25.7           ~ 1 0
15 PSR J1846-0258 Psr 18 46 24.94 -02 58 30.1           ~ 310 2
16 SNR G029.7-00.2 SNR 18 46 25.5 -02 59 14           ~ 304 2
17 NVSS J191834+741505 rG 19 18 34.885 +74 15 05.05           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2021.04.21-19:32:29

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