- ID:
- ivo://CDS.VizieR/J/ApJS/179/195
- Title:
- A catalog of outer ejecta knots in Cas A
- Short Name:
- J/ApJS/179/195
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Hubble Space Telescope images of the core-collapse supernova remnant Cassiopeia A are used to identify high-velocity knots of ejecta located outside the remnant's main emission shell of expanding debris. These ejecta fragments are found near or ahead of the remnant's forward shock front and mostly lie from 120" to 300" in radial distance from the remnant's center of expansion. Filter flux ratios when correlated with published spectra show that these knots can be divided into three emission classes: (1) knots dominated by [NII] {lambda}6548,{lambda}6583 emissions, (2) knots dominated by [OII] {lambda}7319, {lambda}7330 emissions, and (3) knots displaying filter flux ratios suggestive of [SII], [OII], and [ArIII] {lambda}7135 emission line strengths similar to the "fast-moving knots" (FMKs) found in the remnant's bright main shell. Of 1825 knots identified, 444 are strong [NII] emission knots, 192 are strong [OII] emission knots, and 1189 are FMK-like knots. In terms of location around the remnant, 972, 207, and 646 knots are found in the remnant's northeast jet, southwest jet, and non-jet regions, respectively. Assuming a distance of 3.4kpc, derived knot transverse velocities based on proper motion measurements spanning a 9 month interval indicate maximum transverse expansion velocities for these three knot classes of 14500, 13500, and 11500km/s, respectively. We present a catalog of these outlying ejecta clumps comprising finding charts, epoch 2004.2 knot positions, proper motions, photometric filter fluxes, and estimated knot emission type, along with cross-references to previous knot identifications and data. This compilation represents a nearly tenfold increase in the number of outlying, high-velocity ejecta knots identified around the Cassiopeia A remnant.
« Previous |
1 - 10 of 100
|
Next »
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/VII/284
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/284
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996, 2004, 2009, 2014), and on the Web (versions of 1995 July, 1996 August, 1998 September, 2000 August, 2001 December, 2004 January, 2006 April and 2017 June). (Note that version published in Green (1996) was produced in 1993.) This the 2019 June version of the catalogue contains 294 SNRs, and is based on results published in the literature up to the end of 2018. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (J2000.0), angular size, type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in the full version of the catalogue on the Web. It should be noted that there are selection effects which apply to the identification of Galactic SNRs (e.g., Green 1991, 2004, 2005, 2009, 2015), so that care should be taken if these data are used in any statistical studies. Published in Green, D.A., 2019, JApA, 40, 36 (2019JApA...40...36G).
- ID:
- ivo://CDS.VizieR/VII/253
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/253
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996, 2004), and on the Web (versions of 1995 July, 1996 August, 1998 September, 2000 August, 2001 December, 2004 January and 2006 April). (Note that version published in Green (1996) was produced in 1993.) This the 2009 March version of the catalogue contains 274 SNRs, and is based on results published in the literature up to the end of 2008. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (J2000.0), angular size, type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in the full version of the catalogue on the Web. It should be noted that there are selection effects which apply to the identification of Galactic SNRs (e.g., Green 1991, 2004, 2005, 2009), so that care should be taken if these data are used in any statistical studies.
- ID:
- ivo://CDS.VizieR/VII/278
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/278
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996, 2004, 2009, 2014), and on the Web (versions of 1995 July, 1996 August, 1998 September, 2000 August, 2001 December, 2004 January and 2006 April). (Note that version published in Green (1996) was produced in 1993.) This the 2017 June version of the catalogue contains 295 SNRs, and is based on results published in the literature up to the end of 2016. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (J2000.0), angular size, type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in the full version of the catalogue on the Web. It should be noted that there are selection effects which apply to the identification of Galactic SNRs (e.g., Green 1991, 2004, 2005, 2009), so that care should be taken if these data are used in any statistical studies.
- ID:
- ivo://CDS.VizieR/VII/272
- Title:
- A catalogue of Galactic supernova remnants
- Short Name:
- VII/272
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996, 2004, 2009), and on the Web (versions of 1995 July, 1996 August, 1998 September, 2000 August, 2001 December, 2004 January and 2006 April). (Note that version published in Green (1996) was produced in 1993.) This the 2014 May version of the catalogue contains 294 SNRs, and is based on results published in the literature up to the end of 2013. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (J2000.0), angular size, type, flux density at 1GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in the full version of the catalogue on the Web. It should be noted that there are selection effects which apply to the identification of Galactic SNRs (e.g., Green 1991, 2004, 2005, 2009), so that care should be taken if these data are used in any statistical studies. Published in Green, D.A., 2014, BASI, 42, 47 (2014BASI...42...47G).
- ID:
- ivo://CDS.VizieR/VII/211
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/211
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996), and on the World-Wide-Web (versions of July 1995 and August 1996). (Note that version published in Green (1996) was produced in 1993.) This September 1998 version of the catalogue contains 220 SNRs, which is 5 more than listed in the previous version. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (B1950.0), angular size (in arcmin), type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in full version of the catalogue on the World-Wide-Web. It should be noted that there are serious selection effects which apply to the identification of Galactic SNRs (see Green 1991), so that great care should be taken if these data are used in statistical studies.
- ID:
- ivo://CDS.VizieR/VII/187
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/187
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog lists all galactic supernova remnants known and is the July 1995 updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988) and in summary form in Green (1991,1996). The basic parameters of the 194 SNRs included in this (1995 July) version of the catalogue are, for each SNR, its Galactic coordinates, RA and Dec (B1950.0), angular size (in arcmin), type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included and questionable SNRs listed in the catalogue are given in the documentation. It should be noted that there are serious selection effects which apply to the identification of Galactic SNRs (see Green 1991), so that great care should be taken if these data are used in statistical studies.
- ID:
- ivo://CDS.VizieR/VII/210
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/210
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog of known Galactic supernova remnants (SNRs) is an updated version (Version VI, August 1996) of the catalogs of Galactic SNRs presented in detail in Green (Version I 1984, Version II 1988), in summary form in Green (Version III 1991, Version IV 1996), and on the Web (Version V, July 1995). (Note that Version IV, although published in 1996, was producted in 1993.) This August 1996 version of the catalog contains 215 SNRs, which is 21 more than listed in the previous version. The basic summary data included in this catalog for each SNR are its Galactic coordinates, RA and Dec (B1950.0), angular size (in arcmin), type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalog are given in the documentation file (snrs.doc). It should be noted that there are serious selection effects which apply to the identification of Galactic SNRs (see Green 1991), so that great care should be taken if these data are used in statistical studies.
- ID:
- ivo://CDS.VizieR/VII/227
- Title:
- A Catalogue of Galactic Supernova Remnants
- Short Name:
- VII/227
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue of known Galactic supernova remnants (SNRs) is an updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988), in summary form in Green (1991, 1996), and on the World-Wide-Web (versions of 1995 July 1995, 1996 August, 1998 September, and 2000 August). (Note that version published in Green (1996) was produced in 1993.) This 2001 December version of the catalogue contains 231 SNRs, which is 6 more than listed in the previous version. The basic summary data included in this catalogue for each SNR are its Galactic coordinates, RA and Dec (J2000.0), angular size (in arcmin), type, flux density at 1 GHz, spectral index, and any other names. Notes on these parameters, on possible remnants not included, and questionable SNRs listed in the catalogue are given in the full version of the catalogue on the World-Wide-Web. It should be noted that there are serious selection effects which apply to the identification of Galactic SNRs (see Green 1991), so that great care should be taken if these data are used in statistical studies.
- ID:
- ivo://CDS.VizieR/J/ApJS/241/37
- Title:
- 1.4 and 5GHz deep JVLA radio survey of M33
- Short Name:
- J/ApJS/241/37
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed new 1.4 and 5 GHz observations of the Local Group galaxy M33 with the Jansky Very Large Array. Our survey has a limiting sensitivity of 20{mu}Jy (4{sigma}) and a resolution of 5.9" (FWHM), corresponding to a spatial resolution of 24pc at 817kpc. Using a new multiresolution algorithm, we have created a catalog of 2875 sources, including 675 with well-determined spectral indices. We detect sources at the position of 319 of the X-ray sources in the Tullmann+ (2011, J/ApJS/193/31) Chandra survey of M33, the majority of which are likely to be background galaxies. The radio source coincident with M33 X-8, the nuclear source, appears to be extended. Along with numerous HII regions or portions of HII region complexes, we detect 155 of the 217 optical supernova remnants (SNRs) included in the lists of Long+, 2010, J/ApJS/187/495 and Lee & Lee, 2014, J/ApJ/793/134, making this by far the largest sample of remnants at known distances with multiwavelength coverage. The remnants show a large dispersion in the ratio of radio to X-ray luminosity at a given diameter, a result that challenges the current generation of models for synchrotron radiation evolution in SNRs.
