Abstract The shell-type supernova remnant (SNR) G206.7+5.9 was recently discovered in the radio band with Five-hundred-meter Aperture Spherical Telescope (FAST). spans about 3.○5 diameter and exhibits bilateral shells. In this work, we present optical spectra of Large sky Area Multi-Object fiber Spectroscopic (LAMOST), narrow-band (Hα [S ii]) images 1-m T100 telescope. filamentary structure seen Hα image shows a clear correlation emission. We use line ratios to determine physical parameters...

The shell-type supernova remnant (SNR) G206.7+5.9 was recently discovered in the radio band with Five-hundred-meter Aperture Spherical Telescope (FAST). spans about 3.5 diameter and exhibits bilateral shells. In this work, we present optical spectra of Large sky Area Multi-Object fiber Spectroscopic (LAMOST), narrow-band (H$\alpha$ [SII]) images 1-m T100 telescope. filamentary structure seen H$\alpha$ image shows a clear correlation emission. We use line ratios to determine physical...

A group of middle-aged mixed-morphology (MM) supernova remnants (SNRs) interacting with molecular clouds (MC) has been discovered as strong GeV gamma-ray emitters by Large Area Telescope on board Fermi Gamma Ray Space (Fermi-LAT). The recent observations the Suzaku X-ray satellite have revealed that some these emitting SNRs, such IC443, W49B, W44, and G359.1-0.5, overionized plasmas. 3C 391 (G31.9+0.0) is another Galactic MM SNR MC. It was observed in gamma rays Fermi-LAT well 0.3 $-$ 10.0...

We present here the results of observation CTB 37A obtained with X-ray Imaging Spectrometer onboard {\it Suzaku} satellite. The spectrum is well fitted by two components, a single-temperature ionization equilibrium component (VMEKAL) solar abundances, an electron temperature $kT_{\rm e}\sim0.6$ keV, absorbing column density $N_{\rm H}\sim3\times10^{22}$ ${\rm cm^{-2}}$ and power-law photon index $\Gamma$ $\sim 1.6$. characterized clearly detected K-shell emission lines Mg, Si, S, Ar. plasma...

In this work, we have constructed a relation between the surface brightness $(\Sigma)$ and diameter ( D ) of Galactic C- S-type supernova remnants (SNRs). order to calibrate $\Sigma$ - dependence, carefully examined some intrinsic e.g. explosion energy) extrinsic density ambient medium) properties and, taking into account also distance values given in literature, adopted distances for SNRs which relatively more reliable values. These calibrator are all SNRs, i.e. F-type (and SNR Cas A has an...

ABSTRACT The supernova remnant (SNR) IC 443 is one of the best-studied Galactic SNRs at many wavelengths. It interacting with a very complex environment, including SNR G189.6 + 3.3 and H ii regions. In this paper, we report on observations using 1.5- 1-m telescopes to better understand nature these in optical band. We obtain H$\alpha$ images showing both filamentary diffuse structures, long-slit spectra from locations, Balmer forbidden lines detected for 3.3. [S ii]/ ratios confirm ranges...

Abstract 3C 400.2 belongs to the mixed-morphology supernova remnant class, showing center-filled X-ray and shell-like radio morphology. We present a study of with archival Suzaku Fermi -LAT observations. find recombining plasma (RP) in spectra north–east south–east regions. The these regions are well described by two-component thermal models: hard component is RP, while soft collisional ionization equilibrium (CIE) conditions. RP has enhanced abundances, indicating that emission an ejecta...

We present the results from Suzaku X-ray Imaging Spectrometer observation of mixed-morphology supernova remnant (SNR) HB9 (G160.9+2.6). discovered recombining plasma (RP) in western region and spectra here are well described by a model having collisional ionization equilibrium (CIE) RP components. On other hand, eastern best reproduced CIE non-equilibrium model. discuss possible scenarios to explain origin emission based on observational properties concluded that rarefaction scenario is...

In this paper, we present the results from a Suzaku observation of Galactic supernova remnant G272.2−3.2. The spectra G272.2−3.2 are well fitted by single‐temperature variable abundance non‐equilibrium ionization (VNEI) model with an electron temperature kTe∼ 0.77 keV, time‐scale τ∼ 6.5 × 1010 cm−3 s and absorbing column density NH∼ 1.1 1022 cm−2. We have detected enhanced abundances Si, S, Ca, Fe Ni in centre region, indicating that X‐ray emission has ejecta origin. estimate is ne∼...

ABSTRACT We present the first results from an imaging and a spectroscopic survey of optical emission associated with supernova remnant (SNR) G107.5−1.5. discovered diffuse filamentary G107.5−1.5 using 1.5- 1-m telescopes. The emissions North-East (NE) North-West (NW) regions show structure, while South-East (SE) East (E) structure. From long-slit spectra, we found [S ii]/H α > 0.5 for SE E regions, which supports origin being shock-heated gas. average ratio is to be ∼0.4 ∼0.3 NW NE...

We present an investigation of the supernova remnant (SNR) G306.3−0.9, using archival multiwavelength data. The Suzaku spectra are well described by two-component thermal plasma models: soft component is in ionization equilibrium and has a temperature ∼0.59 keV, while hard ∼3.2 keV time-scale ∼2.6 × 1010 cm−3 s. clearly detected Fe K-shell line at energy ∼6.5 from this remnant. overabundances Si, S, Ar, Ca confirm that X-ray emission ejecta origin. centroid K supports G306.3−0.9 Type Ia (SN)...

G349.7+0.2 is a supernova remnant (SNR) expanding in dense medium of molecular clouds and interacting with clumps material emitting gamma-rays. We analyzed the gamma-ray data Large Area Telescope on board Fermi Gamma-Ray Space detected energy range 0.2–300 GeV significance ∼13σ, showing no extended morphology. Modeling spectrum revealed that emission dominantly originates from decay neutral pions, where protons follow broken power-law distribution spectral break at ∼12 GeV. To search for...

We present here the results of X-ray analysis Galactic supernova remnant G346.6-0.2 observed with {\it Suzaku}. K-shell emission lines Mg, Si, S, Ca and Fe are detected clearly for first time. Strong Si S imply that nature is ejecta-dominated. The ejecta-dominated well fitted a combined model consisting thermal plasma in non-equilibrium ionization non-thermal component, which can be regarded as synchrotron photon index $\Gamma$ $\sim 0.6$. Absorbing column density $N_{\rm...

In this paper, we present the analysis of a deep (99.6 ks) observation G304.6+0.1 with X-ray Imaging Spectrometer on board Suzaku satellite. The spectral data are well fitted plasma model consisting thermal component, in collisional ionization equilibrium, and non-thermal component. emission is vmekal an electron temperature kTe∼ 0.75 keV, high absorbing column density NH∼ 3.9 × 1022 cm−2 near/lower solar abundances, which indicate that emitting dominated by swept-up ambient medium....

In this work we have collected observational data for 1328 radio pulsars (PSRs). Distances and others parameters these PSRs were estimated. We present improved distance estimates by considering the importance of their physical properties improvement in distribution star formation regions Galaxy. For purpose, a list accurate calibrators was constructed several natural criteria established. The following values calculated from on PSRs: luminosities at 400 MHz 1400 MHz, characteristic times,...

In this work, we present results from a $\sim$201.6 ks observation of G352.7$-$0.1 by using the X-ray Imaging Spectrometer onboard {\it Suzaku} Observatory. The emission remnant is well described two-temperature thermal models non-equilibrium ionization with variable abundances column density $N_{\rm H}$ $\sim$ 3.3$\times$10$^{22}$ cm$^{-2}$. soft component characterized an electron temperature $kT_{\rm e}$ 0.6 keV, time-scale $\tau$ 3.4$\times$10$^{11}$ cm$^{-3}$ s, and enhanced Si, S, Ar,...

We report the discovery of optical filamentary and diffuse emission from G182.4+4.3 using 1.5-m Russian—Turkish telescope. present CCD images obtained with Hα filter, revealing presence mainly structure to north-west in centre, south north regions remnant. The bright filaments located are well correlated prominent radio shell remnant, strongly suggesting an association. From flux-calibrated imaging, average [S ii]/Hα ratio is found be ∼0.9 ∼1.1 for regions, respectively, which clearly...

3C 396 is a composite supernova remnant (SNR), consisting of central pulsar wind nebula (PWN) and bright shell in the west, which known to be interacting with molecular clouds (MCs). We present study X-ray emission from PWN SNR using archival Suzaku data. The spectrum clearly thermal, without signature non-thermal component. abundances Al Ca are slightly enhanced, indicates presence metal-enriched ejecta. spectra well described by power-law model photon index $\sim$1.97 thermal component an...

The supernova remnant (SNR) IC 443 is one of the best-studied Galactic SNRs at many wavelengths. It interacting with a very complex environment, including SNR G189.6+3.3 and HII regions. In this paper, we observed using 1.5- 1-m telescopes to better understand nature these in optical band. We perform H_alpha images showing both filamentary diffuse structures, long-slit spectra from locations Balmer forbidden lines detected for G189.6+3.3. [SII]/ ratios confirm ranges our estimated electron...

Abstract The masses of some neutron stars (NSs), blackholes (BHs), radio and X-ray pulsars (PSRs) are known but with very different errors. We collected all the considerably reliable mass values these objects we analysed values. Using data number-mass distributions NSs BHs constructed. Among 44 none them has a value > 2M ⊚. On other hand, average for is close to 1.4M distribution number respect their initial maximum at dose investigated possibility explaining high (∼ 6–10M ⊚) by accretion in...

Kes 69 is a mixed-morphology (MM) supernova remnant (SNR) that known to be interacting with molecular clouds based on 1720 MHz hydroxyl (OH) maser emission observations in the northeastern and southeastern regions. We present an investigation of using ∼67 ks Suzaku observation. The X-ray spectrum whole SNR well fitted by non-equilibrium ionization model electron temperature kTe ∼ 2.5 keV, time-scale τ 4.1 × 1010 cm−3 s absorbing column density NH 3.1 1022 cm−2. clearly detected Fe–K α line...

ABSTRACT We report on the first detection of optical emission from shell-type Galactic supernova remnant (SNR) G108.2−0.6. obtained Hα images and long-slit spectra using 1.5-m RTT150 telescope to examine morphological spectral characteristics SNR. detected several filaments along its north south regions, which is consistent with SNR nature. The exhibit [S ii]/Hα ratios in range 0.4–1.1, indicating shock-heated gas. oxygen doublet lines [O i] λλ6300, 6363 region also support indicator...

In this paper, we report the detection of ejecta in middle-aged Galactic supernova remnant G296.1-0.5 with X-ray Imaging Spectrometer onboard Suzaku satellite. The spectra three lobes, north, southeast and southwest inter-lobe regions, consist soft (0.3-2.0 keV) emission originated from non-equilibrium ionization plasma. thermal can be represented by a one-component, region it two- component (VNEI) model. studied regions have lines N, O, Ne, Mg Si elements. is shown for first time work....