J/ApJ/950/81ivo://CDS.VizieR/J/ApJ/950/81CDSNandi P.Stalin C.S.Saikia D.J.Muneer S.Mountrichas G.,Wylezalek D.Sagar R.Kissler-Patig M.2025-09-03T08:51:08Z2025-09-03T09:46:17ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frseyfert-galaxiesactive-galactic-nucleistar-forming-regionsultraviolet-photometryextinctionvisible-astronomyinfrared-astronomyWe present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Violet Imaging Telescope, we have compiled a catalog of 284 star-forming (SF) regions, out of which we could detect 120 SF regions in H{alpha} observations. Across the entire galaxy, we found the extinction-corrected star formation rate (SFR) in the far ultraviolet (UV) to range from 2.0x10^-5^M_{sun}_/yr to 1.5x10^-2^M_{sun}_/yr with a median of 3.0x10^-4^M_{sun}_/yr, and the age to lie in the range of ~1 to 98Myr with a median of 14Myr. In H{alpha} we found the SFR to range from 7.2x10^-^6M_{sun}_/yr to 2.7x10^-2^M_{sun}_/yr with a median of 1.7x10^-4^M_{sun}_/yr, and the age to lie between 3 to 6Myr with a median of 5Myr. The stellar ages derived from H{alpha} show a gradual decline with galactocentric distance. We found three SF regions close to the center of NGC 4395 with high SFRs both from H{alpha} and UV, which could be attributed to feedback effects from the AGN. We also found six other SF regions in one of the spiral arms having higher SFRs. These are very close to supernova remnants, which could have enhanced the SFR locally. We obtained a specific SFR (SFR per unit mass) for the whole galaxy of 4.64x10^-10^yr^-1^.2023ApJ...950...81Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/950/81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)II/311 : WISE All-Sky Data Release (Cutri+ 2012)J/A+A/391/809 : HII regions in NGC 5457 and NGC 4395 (Cedres+, 2002)J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/ApJ/703/1672 : Far-IR and H{alpha} fluxes in galaxies (Kennicutt+, 2009)J/ApJ/706/599 : H{alpha} and UV SFR in the local volume (Lee+, 2009)J/ApJ/744/44 : H{alpha} and UV fluxes in nearby galaxies (Weisz+, 2012)J/MNRAS/429/189 : SNRs in six nearby galaxies (Leonidaki+, 2013)J/MNRAS/451/3173 : Circumnuclear star-forming regions (Alvarez-Alvarez+, 2015)J/AJ/150/43 : Star formation in active and normal galaxies (Tsai+, 2015)J/ApJ/847/136 : H{beta} to N2 line fluxes of nearby galaxies (Brown+, 2017)J/ApJ/872/16 : Star formation law revisited. I. (de los Reyes+, 2019)J/ApJ/892/93 : UV-NIR monitoring campaign of NGC 4395 (Cho+, 2020)J/ApJ/896/10 : NSA low-mass galaxies with PTF obs. (Baldassare+, 2020)J/ApJ/934/L37 : NGC 4395 FTN/MuSCAT3 photometry obs. (Montano+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/950/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/950/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/950/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/950/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/950/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/950/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/950/81/table3 (Catalogue of star-forming (SF) regions in NGC 4395)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/950/81/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/950/81/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/950/81/table3?GETtext/xml+votable180.050000true186.5540311133.516306110.005555555555555556Cone search capability for table J/ApJ/950/81/table4 (Star formation rate (SFR) in multiple wavelengths determined for the 14 SF regions identified in the MIPS 24um image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/950/81/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/950/81/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/950/81/table4?GETtext/xml+votable180.050000true186.48853533.5020650.0055555555555555566/28535 28541https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/950/81?format=asciiUVOpticalInfrareddefaultJ/ApJ/950/81/table3Catalogue of star-forming (SF) regions in NGC 4395recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[186.36/186.6] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[33.47/33.7] Declination (J2000)degpos.eq.dec;meta.mainamaj[0.84/7.9] Semi-major axis, star forming regionarcsecphys.angSize.smajAxisfloatbmin[0.58/4.3] Semi-minor axis, star forming regionarcsecphys.angSize.sminAxisfloatPA[0/360] Position angle, star forming regiondegpos.posAng;obs.fieldfloatmagFUV[14/21.3] Extinction corrected UVIT/F148W magnitudemagphot.mag;arith.diff;em.UV.100-200nmfloatmagNUV[14.2/21.1] Extinction corrected UVIT/N263M magnitudemagphot.mag;arith.diff;em.UV.200-300nmfloatAFUV[-1.2/4.97] Extinction, F148Wmagphys.absorption;em.UV.100-200nmfloatANUV[-0.9/3.61] Extinction, N263Mmagphys.absorption;em.UV.200-300nmfloatSSFRFUV[0.005/2.6] Extinction corrected surface density of star formation rate, F148WsolMass.yr**-1.kpc**-2phys.SFR;em.UV.100-200nmfloatSSFRNUV[0.007/1.91] Extinction corrected surface density of star formation rate, N263MsolMass.yr**-1.kpc**-2phys.SFR;em.UV.200-300nmfloatl_ageUVLimit flag on age-UV (1)meta.code.error;time.age;em.UVcharageUV[1/100] Age calculated in UVMyrtime.age;meta.modelled;em.UVintJ/ApJ/950/81/table4Star formation rate (SFR) in multiple wavelengths determined for the 14 SF regions identified in the MIPS 24um imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/14] Sequential MIPS SFR identifiermeta.id;meta.mainintRAJ2000[186.35/186.52] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[33.5/33.62] Declination (J2000)degpos.eq.dec;meta.mainamaj[3.97/23.1] Semi-major axis, star forming regionarcsecphys.angSizefloatbmin[3.1/17.3] Semi-minor axis, star forming regionarcsecphys.angSize.sminAxis;obs.fieldfloatPA[-89.7/88.3] Position angle, star forming regiondegpos.posAng;obs.fieldfloatSFRFUV[0.02/4.2] Star formation rate, FUV0.001solMass.yr**-1phys.SFR;em.UV.100-200nmfloate_SFRFUV[0.001/0.06] Uncertainty in SFR-FUV0.001solMass.yr**-1stat.error;phys.SFR;em.UV.100-200nmfloatSFRNUV[0.02/4.2] Star formation rate, NUV0.001solMass.yr**-1phys.SFR;em.UV.200-300nmfloate_SFRNUV[0.001/0.05] Uncertainty in SFR-NUV0.001solMass.yr**-1stat.error;phys.SFR;em.UV.200-300nmfloatSFRHa[0.006/13.5] Star formation rate, H{alpha}0.001solMass.yr**-1phys.SFR;em.line.Halphafloate_SFRHa[0.001/0.008] Uncertainty in SFR-Ha0.001solMass.yr**-1stat.error;phys.SFR;em.line.HalphafloatSFR24um[0.36/10.7] Star formation rate, 24um0.001solMass.yr**-1phys.SFR;em.IR.15-30umfloate_SFR24um[0.16/1] Uncertainty in SFR-24um0.001solMass.yr**-1stat.error;phys.SFR;em.IR.15-30umfloat