2015A&A...576A..81S


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.24CEST11:49:01

2015A&A...576A..81S - Astronomy and Astrophysics, volume 576A, 81-81 (2015/4-1)

A complete radio study of SNR G15.4+0.1 from new GMRT observations.

SUPAN L., CASTELLETTI G., JOSHI B.C., SURNIS M.P. and SUPANITSKY D.

Abstract (from CDS):

The supernova remnant (SNR) G15.4+0.1 is considered to be the possible counterpart of the γ-ray source HESS J1818-154. With the goal of getting a complete view of this remnant and understanding the nature of the γ-ray flux, we conducted a detailed radio study that includes the search for pulsations and a model of the broadband emission for the SNR G15.4+0.1/HESS J1818-154 system. Low-frequency imaging at 624MHz and pulsar observations at 624 and 1404MHz towards G15.4+0.1 were carried out with the Giant Metrewave Radio Telescope (GMRT). We correlated the new radio data with observations of the source at X-ray and infrared wavelengths from XMM-Newton and Herschel observatories, respectively. To characterize the neutral hydrogen (HI) medium towards G15.4+0.1, we used data from the Southern Galactic Plane Survey. We modelled the spectral energy distribution (SED) using both hadronic and leptonic scenarios. From the combination of the new GMRT observations with existing data, we derived a continuum spectral index α=-0.62±0.03 for the whole remnant. The local synchrotron spectra of G15.4+0.1, calculated from the combination of the GMRT data with 330MHz observations from the Very Large Array, tends to be flatter in the central part of the remnant, accompanying the region where the blast wave is impinging molecular gas. No spectral index trace was found indicating the radio counterpart to the pulsar wind nebula proposed from X-ray observations. In addition, the search for radio pulsations yielded negative results. Emission at far-infrared wavelengths is observed in the region where the SNR shock is interacting with dense molecular clumps. We also identified HI features forming a shell that wraps most of the outer border of G15.4+0.1. Characteristic parameters were estimated for the shocked HI gas. We found that either a purely hadronic or leptonic model is compatible with the broadband emission known so far.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: SNR G15.4+0.1 - ISM: supernova remnants - radio continuum: ISM - gamma rays: ISM

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 551 4
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5457 4
3 IC 443 SNR 06 18 02.7 +22 39 36           ~ 1063 1
4 SNR G292.0+01.8 SNR 11 24 59 -59 19.1           ~ 278 1
5 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3585 1
6 PSR B1642-03 Psr 16 45 02.0414 -03 17 58.320           ~ 314 0
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10863 0
8 HESS J1818-154 gam 18 16.1 -15 12           ~ 10 0
9 [CSD2013] B MoC 18 17 57.0 -15 20 13           ~ 2 0
10 SNR G015.4+00.1 Rad 18 18.0 -15 27           ~ 20 1
11 [CSD2013] A MoC 18 18 02.0 -15 25 23           ~ 2 0
12 NVSS J181806-152321 Rad 18 18 06.0 -15 23 21           ~ 1 0
13 HRDS G015.520+00.188 HII 18 18 11.7 -15 21 13           ~ 4 0
14 PMN J1822-0939 Rad 18 22 28.70 -09 38 57.0           ~ 28 1
15 PSR J1833-1034 Psr 18 33 33.612 -10 34 07.69           ~ 372 1
16 3C 391.0 Rad 18 49 23.3 -00 55 38           ~ 308 2
17 SNR G033.6+00.1 SNR 18 52 29.000 +00 38 42.00           ~ 230 1
18 PSR J1901-0906 Psr 19 01 53.015 -09 06 10.80           ~ 30 0
19 SNR G039.2-00.3 SNR 19 04 04.50 +05 27 12.0           ~ 166 1
20 3C 397 SNR 19 07 33.20 +07 08 32.0           ~ 183 2
21 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 928 2
22 SNR G094.0+01.0 SNR 21 24 50 +51 53.0           ~ 75 0
23 SNR G106.3+02.7 SNR 22 27.5 +60 50           ~ 34 1
24 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2315 1

    Equat.    Gal    SGal    Ecl

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2019.07.24-11:49:01

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