Search

Start Over Capability Type Simple Cone Search
2981. Clusters of starburst galaxy NGC4214
ID:
ivo://CDS.VizieR/J/ApJ/767/51
Title:
Clusters of starburst galaxy NGC4214
Short Name:
J/ApJ/767/51
Date:
21 Oct 2021
Publisher:
CDS
Description:
The production rate of ionizing photons in young (<=8Myr), unresolved stellar clusters in the nearby irregular galaxy NGC 4214 is probed using multi-wavelength Hubble Space Telescope WFC3 data. We normalize the ionizing photon rate by the cluster mass to investigate the upper end of the stellar initial mass function (IMF). We have found that within the uncertainties the upper end of the stellar IMF appears to be universal in this galaxy, and that deviations from a universal IMF can be attributed to stochastic sampling of stars in clusters with masses {<~}10^3^M_{sun}_. Furthermore, we have found that there does not seem to be a dependence of the maximum stellar mass on the cluster mass. We have also found that for massive clusters, feedback may cause an underrepresentation in H{alpha} luminosities, which needs to be taken into account when conducting this type of analysis.
2982. CMA Catalog Central 6 Arcmin
ID:
ivo://nasa.heasarc/le
Title:
CMA Catalog Central 6 Arcmin
Short Name:
LE
Date:
28 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
This database table contains results from the LE telescope for only the central 6 arc-minutes. It is the same as the CMA database in every other respect. This is a service provided by NASA HEASARC .
2983. 6cm and 3cm sources in SMC
ID:
ivo://CDS.VizieR/J/other/Ser/184.93
Title:
6cm and 3cm sources in SMC
Short Name:
J/other/Ser/184.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present two new catalogues of radio-continuum sources in the field of the Small Magellanic Cloud (SMC). These catalogues contain sources found at 4800MHz (&#955;=6cm) and 8640MHz (&#955;=3cm). Some 457 sources have been detected at 3cm with 601 sources at 6cm created from new high-sensitivity and resolution radio-continuum images of the SMC from Crawford et al. (<A HREF="http://simbad.cds.unistra.fr/simbad/sim-ref?bibcode=2011SerAJ.183...95C%202011SerAJ.183...95C">2011SerAJ.183...95C 2011SerAJ.183...95C</A>).
2984. 6cm and 20cm survey of Galactic Center
ID:
ivo://CDS.VizieR/J/ApJS/177/515
Title:
6cm and 20cm survey of Galactic Center
Short Name:
J/ApJS/177/515
Date:
21 Oct 2021
Publisher:
CDS
Description:
We describe the results of a millijansky sensitivity VLA survey of roughly 1deg^2^ near the Galactic center at 6 and 20cm. Catalogs of compact and filamentary structures are given and compared to previous surveys of the region. Eight of the unusual nonthermal radio filaments are detected in 6cm polarized emission; three of these are the first such detections, confirming their nonthermal nature. This survey found emission from a filament at (l,b)=(359.1,0.75), or a projected distance from Sgr A* of 200pc, greatly extending the latitude range observed with such features. There is also new evidence for spatial gradients in the 6/20cm spectral indices of some filaments, and we discuss models for these gradients. In studying compact sources, the combination of spectral index and polarization information allows us to identify pulsar candidates and compact HII regions in the survey. There is also some evidence that the flux measurements of compact sources may be affected by electron scattering from the interstellar medium in the central few hundred parsecs of the Galaxy.
2985. CMa OB1 XMM-Newton Point Source Near-Infrared Counterpart Properties Catalog
ID:
ivo://nasa.heasarc/cmaob1nir
Title:
CMa OB1 XMM-Newton Point Source Near-Infrared Counterpart Properties Catalog
Short Name:
CMAOB1NIR
Date:
28 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Canis Major OB1 association has an intriguing scenario of star formation, especially in the region called Canis Major R1 (CMa R1) traditionally assigned to a reflection nebula, but in reality an ionized region. The authors focused on the young stellar population associated with CMa R1, for which previous results from ROSAT, optical, and near-infrared data had revealed two stellar groups with different ages, suggesting a possible mixing of populations originated from distinct star formation episodes (see the &lt;a href="/W3Browse/rosat/cmar1xray.html"&gt;table CMAR1XRAY&lt;/a&gt;). The observations performed with XMM-Newton resulted in a sample of 387 X-ray sources (187, 84, 37, and 79 in Fields E, C, S , and W, respectively), 340 of which have one or more NIR (2MASS) counterparts. This table contains the 2MASS photometry, estimates of age and mass, and infrared classification of members of the CMa R1 region and counterparts to X-ray sources, based on 2MASS and WISE data. The authors also used X-ray data to characterize the detected sources (387 sources) according to hardness ratios, light curves, and spectra (see the associated table &lt;a href="/W3Browse/xmm-newton/cmaob1xmm.html"&gt;CMAOB1XMM&lt;/a&gt;). For this work, four fields (each about 30-arcmin diameter with some overlap) were defined. These fields are located inside the arc-shaped ionized nebula, next to Z CMa - Field E (east); around GU CMa - Field W (west); and between both - Field C (center) and Field S (south), as shown in Figure 1 of the reference paper. &lt;pre&gt; RA(J2000) | Dec(J2000) | Designation(s) 07 04 18.3 | -11 27 24.0 | CMa cluster east (Field E) 07 02 58.4 | -11 34 44.7 | CMa cluster center (Field C) 07 02 29.5 | -11 47 12.4 | CMa cluster south (Field S) 07 01 23.0 | -11 19 56.6 | CMa cluster west (Field W) &lt;/pre&gt; The authors have selected NIR counterparts by searching the 2MASS catalog for candidates located less that 10&#39;&#39; away from the nominal X-ray source positions. No counterpart was found for 45 sources. Candidates for which the distance seems to be incompatible with the CMaR1 molecular cloud were disregarded. This table includes the complete list of NIR counterparts, however the authors only consider as reliable those flagged as &#39;AAA&#39; in the 2MASS catalog (i.e., with S/N &gt; 10, magnitude errors &lt;0.1 mag, and above the JHK completeness limits), given by the twomass_flags field in this table. There are 340 such reliable NIR counterparts for 290 X-ray sources, including 46 X-ray sources with multiple counterpart candidates. X-ray and NIR data have revealed that most (79%) of the XMM-Newton sources are probable members of CMa R1. The combination of the results from both analyses can confirm their young nature. On the other hand, 21% of the XMM-Newton sample are probably field objects. Among these, 6% (23/387) have infrared counterparts that probably are foreground stars and 4% (17/387) have counterparts that are too faint (bad quality data) without reliable classification. The other 11% of undefined sources (44/387) do not have 2MASS data because they are classified as possible background objects. The authors have seen that the XMM-Newton error boxes may include multiple NIR counterparts. In such cases, they restricted the comparative analysis to the 158 X-ray sources of their &quot;best sample&quot; that are associated with a single NIR counterpart, as described in Section 4.3 of the reference paper. A distance of 1 kpc to CMa OB1 is assumed for this table. This table was created by the HEASARC in October 2018 based upon the &lt;a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/609/A127"&gt;CDS Catalog J/A+A/609/A127&lt;/a&gt; file tableb2.dat. This is a service provided by NASA HEASARC .
2986. CMa OB1 XMM-Newton X-Ray Point Source Catalog
ID:
ivo://nasa.heasarc/cmaob1xmm
Title:
CMa OB1 XMM-Newton X-Ray Point Source Catalog
Short Name:
CMAOB1XMM
Date:
28 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Canis Major OB1 association has an intriguing scenario of star formation, especially in the region called Canis Major R1 (CMa R1) traditionally assigned to a reflection nebula, but in reality an ionized region. The authors focused on the young stellar population associated with CMa R1, for which previous results from ROSAT, optical, and near-infrared data had revealed two stellar groups with different ages, suggesting a possible mixing of populations originated from distinct star formation episodes (see the &lt;a href="/W3Browse/rosat/cmar1xray.html"&gt;table CMAR1XRAY&lt;/a&gt;). The authors used X-ray data to characterize the detected sources according to hardness ratios, light curves, and spectra. They also provided estimates of mass and age, using the information from likely counterparts based on the 2MASS catalogue. The 2MASS-derived data on the counterparts, where matched, are provided in the &lt;a href="/W3Browse/xmm-newton/cmaob1nir.html"&gt;associated table (CMAOB1NIR)&lt;/a&gt;. This table contains a catalog of 387 XMM-Newton sources, of which 78% are confirmed as members or probable members of the CMa R1 association. Flares (or similar events) were observed for 13 sources and the spectra of 21 bright sources could be fitted by a thermal plasma model. Mean values of fits parameters were used to estimate X-ray luminosities. The authors found a minimum value of log(L&lt;sub&gt;X&lt;/sub&gt; [erg/s]) = 29.43, indicating that the sample of low-mass stars (M&lt;sub&gt;*&lt;/sub&gt; &lt;= 0.5 M&lt;sub&gt;sun&lt;/sub&gt;), which are faint X-ray emitters, is incomplete. Among the 250 objects selected as the complete subsample (defining a &quot;best sample&quot;), 171 are found to the east of the cloud, near Z CMa and dense molecular gas, of which 50% of them are young (&lt;5Myr) and 30% are older (&gt;10Myr). The opposite happens to the west, near GU CMa, in areas lacking molecular gas: among 79 objects, 30% are young and 50% are older. These findings confirm that a first episode of distributed star formation occurred in the whole studied region ~10Myr ago and dispersed the molecular gas, while a second, localized episode (&lt;5Myr) took place in the regions where molecular gas is still present. For this work, four fields (each about 30-arcmin diameter with some overlap) were observed with the XMM-Newton satellite. These fields are located inside the arc-shaped ionized nebula, next to Z CMa - Field E (east); around GU CMa - Field W (west); and between both - Field C (center) and Field S (south), as shown in Figure 1 of the reference paper. These observations were performed with the EPIC cameras (MOS1, MOS2, and PN) in full frame mode with a medium filter. The C, W, and S fields had an exposure time without background corrections of about 30 ks while field E had 40 ks. &lt;pre&gt; RA(J2000) | Dec(J2000) | Designation(s) 07 04 18.3 | -11 27 24.0 | CMa cluster east (Field E) 07 02 58.4 | -11 34 44.7 | CMa cluster center (Field C) 07 02 29.5 | -11 47 12.4 | CMa cluster south (Field S) 07 01 23.0 | -11 19 56.6 | CMa cluster west (Field W) &lt;/pre&gt; This table was created by the HEASARC in October 2018 based upon the &lt;a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/609/A127"&gt;CDS Catalog J/A+A/609/A127&lt;/a&gt; file tableb1.dat. This is a service provided by NASA HEASARC .
2987. CMC15, Carlsberg Meridian Catalogue
ID:
ivo://svo.cab/cmc15
Title:
CMC15, Carlsberg Meridian Catalogue
Short Name:
CMC15
Date:
03 Jun 2020 15:34:50
Publisher:
SVO CAB
Description:
CMC15 is an astrometric and photometric catalogue of more than 122.7 million stars in the magnitude range 9 < r' (SDSS) < 17. With a positional accuracy to about 35 mas, the catalogue covers the declination range -40deg to 50deg. The current release comprises all the observations made between March 1999 and March 2011. The catalogue fills the gap between 5h 30m and 10h 30m for declinations south of -15deg of the CMC14 and adds the bans -30deg to -40deg. Some zones north of -30deg have also been re-observed in order to improve their internal errors.
2988. CMD and mass distribution of Ba stars
ID:
ivo://CDS.VizieR/J/A+A/608/A100
Title:
CMD and mass distribution of Ba stars
Short Name:
J/A+A/608/A100
Date:
21 Oct 2021
Publisher:
CDS
Description:
With the availability of parallaxes provided by the Tycho-Gaia Astrometric Solution, it is possible to construct the Hertzsprung-Russell diagram (HRD) of barium and related stars with unprecedented accuracy. A direct result from the derived HRD is that subgiant CH stars occupy the same region as barium dwarfs, contrary to what their designations imply. By comparing the position of barium stars in the HRD with STAREVOL evolutionary tracks, it is possible to evaluate their masses, provided the metallicity is known. We used an average metallicity [Fe/H]=-0.25 and derived the mass distribution of barium giants. The distribution peaks around 2.5M_{sun}_, with a tail at higher masses up to 4.5M_{sun}_. This peak is seen as well in the mass distribution of a sample of normal K and M giants used for comparison and is associated with stars located in the red clump. When we compare these mass distributions, we see a deficit of low-mass (1-2M_{sun}_) barium giants. This is probably because low-mass stars reach large radii at the tip of the red giant branch, which may have resulted in an early binary interaction. Among barium giants, the high-mass tail is however dominated by stars with a barium index (based on a visual inspection of the barium spectral line) less than unity, i.e., with a very moderate barium line strength. We believe that these stars are not genuine barium giants, but rather bright giants (or supergiants) where the barium lines are strengthened because of a positive luminosity effect. Moreover, contrary to previous claims, we do not see differences between the mass distributions of mild and strong barium giants.
2989. 6 & 1.3cm deep VLA obs. toward 58 high-mass SFRs
ID:
ivo://CDS.VizieR/J/ApJS/227/25
Title:
6 & 1.3cm deep VLA obs. toward 58 high-mass SFRs
Short Name:
J/ApJS/227/25
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a high-sensitivity radio continuum survey at 6 and 1.3cm using the Karl G. Jansky Very Large Array toward a sample of 58 high-mass star-forming regions. Our sample was chosen from dust clumps within infrared dark clouds with and without IR sources (CMC-IRs and CMCs, respectively), and hot molecular cores (HMCs), with no previous, or relatively weak radio continuum detection at the 1mJy level. Due to the improvement in the continuum sensitivity of the Very Large Array, this survey achieved map rms levels of ~3-10{mu}Jy/beam at sub-arcsecond angular resolution. We extracted 70 continuum sources associated with 1.2mm dust clumps. Most sources are weak, compact, and prime candidates for high-mass protostars. Detection rates of radio sources associated with the millimeter dust clumps for CMCs, CMC-IRs, and HMCs are 6%, 53%, and 100%, respectively. This result is consistent with increasing high-mass star formation activity from CMCs to HMCs. The radio sources located within HMCs and CMC-IRs occur close to the dust clump centers, with a median offset from it of 12000au and 4000au, respectively. We calculated 5-25GHz spectral indices using power-law fits and obtained a median value of 0.5 (i.e., flux increasing with frequency), suggestive of thermal emission from ionized jets. In this paper we describe the sample, observations, and detections.
2990. 7C 151-MHz Low-Declination Survey Catalog
ID:
ivo://nasa.heasarc/ld7c151mhz
Title:
7C 151-MHz Low-Declination Survey Catalog
Short Name:
LD7C151MHZ
Date:
28 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Cambridge Low Frequency Synthesis Telescope (CLFST) has been used at 151 MHz to survey a region of 1393 square degrees, in the range of RA from 9&lt;sup&gt;h&lt;/sup&gt; to 16&lt;sup&gt;h&lt;/sup&gt;, and of Dec from 20&lt;sup&gt;o&lt;/sup&gt; to 35&lt;sup&gt;o&lt;/sup&gt;, with an angular resolution of 108 x 108cosec(Dec) arcsec&lt;sup&gt;2&lt;/sup&gt;. The rms noise in the maps is in general ~ 35 - 55 mJy/beam, but varies considerably and exceeds this in some areas. The authors have extracted sources with signal-to-noise ratio &gt; 5.5, a total of 5526 sources, and this table contains the catalog of their positions and flux densities. This table was created by the HEASARC in October 2010 based on CDS table J/MNRAS/282/779 file 7c_low.dat. This is a service provided by NASA HEASARC .

Limit your search

more »

more »

more »

more »

more »

more »