GMRTJ0916 ivo://nasa.heasarc/gmrtj0916 NASA/GSFC HEASARC Sirothia et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a catalog based on deep multifrequency observations made using the Giant Metrewave Radio Telescope (GMRT) at 153, 244, 610 and 1260 MHz of a field centred on J0916+6348, to search for evidence of fossil radio lobes which could be due to an earlier cycle of episodic activity of the parent galaxy, as well as haloes and relics in clusters of galaxies. The authors do not find any unambiguous evidence of episodic activity in a list of 374 sources, suggesting that such activity is rare even in relatively deep low-frequency observations. The authors examine the spectra of all the sources by combining their observations with those from the Westerbork Northern Sky Survey (WENSS), NRAO (National Radio Astronomy Observatories) VLA (Very Large Array) Sky Survey (NVSS) and the Faint Images of the Radio Sky at Twenty-Centimeters Survey (FIRST). Considering only those which have measurements at a minimum of 3 different frequencies, they find that almost all sources are consistent with a straight spectrum with a median spectral index alpha ~ 0.8 (S<sub>nu</sub> ~ nu<sup>-alpha</sup>) which appears steeper than theoretical expectations of the injection spectral index. The authors identify 14 very-steep-spectrum sources with alpha >~ 1.3. This table contains the list of 317 sources (out of the 374 sources which were within 1.5 degrees of the phase center at 153 MHz and had peak brightnesses at least 6 times larger than the local rms value) which were detected at a minimum of 3 frequencies out of the 6 frequencies (153, 244, 327, 610, 1260 and 1400 MHz) which were utilized in this study. The new observations were made on 2005 December 12 at 153 MHz, 2005 November 26 at 244 MHz and 610 MHz, and on 2008 April 22 at 1260 MHz, on the Giant Metrewave Radio Telescope (Pune, India). This table was created by the HEASARC in March 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/392/1403">CDS Catalog J/MNRAS/392/1403</a> file table2.dat. This is a service provided by NASA HEASARC . 2009MNRAS.392.1403S https://heasarc.gsfc.nasa.gov/W3Browse/all/gmrtj0916.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gmrtj0916& GET text/xml 180 99999 true 139.09083333 62.4125 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gmrtj0916 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gmrtj0916&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gmrtj0916 Giant Metrewave Radio Telescope J0916+6348 Field Radio Source Ca name Source Designation ([SSI2009] JHHMMSS+DDMMSS) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable off_axis Distance from Pointing Center to the Centroid of the Source in the 150-MHz Image arcmin instr.offset double nullable flux_153_mhz Total Flux Density at 153 MHz mJy phot.flux.density;em.radio.100-200MHz double nullable flux_244_mhz Total Flux Density at 244 MHz mJy phot.flux.density;em.radio.200-400MHz double nullable wenss_flux_330_mhz Total Flux Density at 330 MHz mJy phot.flux.density;em.radio.200-400MHz double nullable flux_610_mhz Total Flux Density at 610 MHz mJy phot.flux.density;em.radio.400-750MHz double nullable spectral_index Spectral Index from a Linear Least-Squares Fit spect.index;em.radio double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable source_type Structural Classification src.morph char nullable flux_1260_mhz Total Flux Density at 1260 MHz mJy phot.flux.density;em.radio.750-1500MHz double nullable nvss_flux_1400_mhz Total Flux Density at 1400 MHz mJy phot.flux.density;em.radio.750-1500MHz double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable