NGC 5530

{{short description|Galaxy in the constellation Lupus}} {{Sky|14|18|27.30|-|43|23|22.0}} {{Infobox galaxy | name = [[New General Catalogue|NGC]] 5530 | image = NGC 5530 imaged by the Hubble Space Telescope.jpg | caption = NGC 5530 imaged by the [[Hubble Space Telescope]] | epoch = [[J2000]] | type = SA(rs)c <ref name="ned">{{cite web | website=NASA/IPAC Extragalactic Database | publisher = [[NASA]] and [[California Institute of Technology|Caltech]] | title=Results for object NGC 5530 | url=https://ned.ipac.caltech.edu/byname?objname=NGC+5530 | access-date=5 March 2025}}</ref> | ra = {{RA|14|18|27.30}}<ref name="ned" /> | dec = {{DEC|-43|23|22.0}}<ref name="ned" /> | dist_ly = [[1 E22 m|39.7]] ± 4.6 [[light-year|Mly]] (12.2 ± 1.4 [[parsec|Mpc]])<ref name="ned" /> | z = 0.003979 ± 0.000007 <ref name="ned" /> | h_radial_v = 1,193 ± 2 [[kilometer|km]]/[[second|s]]<ref name="ned" /> | appmag_v = 11.0 <ref name=seds>{{cite web |title=Revised NGC Data for NGC 5530 |url=http://spider.seds.org/ngc/revngcic.cgi?NGC5530 |website=spider.seds.org |access-date=25 November 2018}}</ref> | size_v = 4.2{{prime}} × 1.9{{prime}} <ref name="ned" /> | size = ~{{convert|22.72|kpc|ly|abbr=on|lk=on|order=flip}} (estimated){{r|ned}} | constellation name = [[Lupus (constellation)|Lupus]] | notes = | names = {{odlist | name= ESO 272- G 003 | MCG= -07-29-013 | IRAS= 14152-4309 | PGC= 51106}}<ref name="ned" /> }} '''NGC 5530''' is a [[spiral galaxy]] located in the constellation [[Lupus (constellation)|Lupus]]. It is located at a distance of about 40 million [[light year]]s from Earth, which, given its apparent dimensions, means that NGC 5530 is about 60,000 light years across.<ref name="ned" /> It was discovered by [[John Herschel]] on April 7, 1837.<ref name="Seligman">{{cite web |last1=Seligman |first1=Courtney |title=NGC 5530 |url=https://cseligman.com/text/atlas/ngc55.htm#5530 |website=Celestial Atlas |access-date=19 November 2018}}</ref>

NGC 5530 is a member of the NGC 5643 Group, named after [[NGC 5643]].<ref name="Makarov">{{cite journal|last1=Makarov|first1=Dmitry|last2=Karachentsev|first2=Igor|title=Galaxy groups and clouds in the local (z~ 0.01) Universe|journal=Monthly Notices of the Royal Astronomical Society|date=21 April 2011|volume=412|issue=4|pages=2498–2520|doi=10.1111/j.1365-2966.2010.18071.x|doi-access=free |url=http://www.sao.ru/hq/dim/groups/galaxies.dat|bibcode=2011MNRAS.412.2498M|arxiv=1011.6277|s2cid=119194025|access-date=1 February 2025}}</ref>

== Characteristics == NGC 5530 has a flocculent spiral pattern, with multiple [[spiral arm]]s and spiral fragments with many knots.<ref name=Carnegie>Sandage, A., Bedke, J. (1994), ''The Carnegie Atlas of Galaxies. Volume I'', Carnegie Institution of Washington</ref><ref name="Corwin1985">Corwin, H. G.; de Vaucouleurs, A.; de Vaucouleurs, G (1985) ''Southern Galaxy Catalogue.'' University of Texas</ref> Dust lanes associated with spiral arms are visible across the disk.<ref name=Carnegie/> The galaxy has a small [[galactic nucleus|nucleus]]<ref name=Carnegie/> with a magnitude 13 field star superimposed. In [[H-alpha]] images some faint [[HII region]]s are visible, but are hard to distinguish among the starry field.<ref>{{cite journal |last1=Ryder |first1=Stuart D. |last2=Dopita |first2=Michael A. |title=An H-alpha atlas of nearby southern spiral galaxies |journal=The Astrophysical Journal Supplement Series |date=October 1993 |volume=88 |pages=415 |doi=10.1086/191827}}</ref> In blue filter the galaxy has an inner pseudoring which has a diameter of 4.6 kpc and accounts for 14% of the total H-alpha emission of the galaxy. The star formation rate of the galaxy is estimated to be {{val|1.0|0.4|ul=M_solar}} based on H-alpha emission.<ref>{{cite journal |last1=Grouchy |first1=R. D. |last2=Buta |first2=R. J. |last3=Salo |first3=H. |last4=Laurikainen |first4=E. |title=RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES |journal=The Astronomical Journal |date=1 June 2010 |volume=139 |issue=6 |pages=2465–2493 |doi=10.1088/0004-6256/139/6/2465|arxiv=1004.5063 }}</ref> In the nucleus lies a [[nuclear star cluster]] which has a radius of 2.6 arcseconds.<ref>{{cite journal |last1=Georgiev |first1=Iskren Y. |last2=Böker |first2=Torsten |last3=Leigh |first3=Nathan |last4=Lützgendorf |first4=Nora |last5=Neumayer |first5=Nadine |title=Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes |journal=Monthly Notices of the Royal Astronomical Society |date=1 April 2016 |volume=457 |issue=2 |pages=2122–2138 |doi=10.1093/mnras/stw093 |doi-access=free |url=https://cdsarc.cds.unistra.fr/viz-bin/nph-Cat/txt?J/MNRAS/457/2122/tablea1.dat|arxiv=1601.02613 }}</ref>

==Supernova== One [[supernova]] has been discovered in NGC 5530, SN 2007it. It was discovered visually by [[Robert Evans (astronomer)|Robert Evans]] on 13 September 2007 at an [[apparent magnitude]] of 13.5, lying 24" west and 25" north of the nucleus.<ref>{{cite journal |last1=Itagaki |first1=K. |last2=Li |first2=W. |last3=Sehgal |first3=A. |last4=Puckett |first4=T. |last5=Yuan |first5=F. |last6=Quimby |first6=R. |last7=Naito |first7=H. |last8=Boles |first8=T. |last9=Monard |first9=L. A. G. |last10=Villi |first10=M. |last11=Evans |first11=R. |last12=Frieman |first12=J. |author13=Nearby Supernova Factory Collaboration |title=Supernovae 2007gw-2007kd |journal=International Astronomical Union Circular |date=2007 |issue=8874 |page=3 |bibcode=2007IAUC.8874....3I | url = http://www.cbat.eps.harvard.edu/iauc/08800/08874.html#item3}}</ref> It was determined spectrographically as a young [[Type II supernova]].<ref>{{cite journal |last1=Contreras |first1=C. |last2=Morrell |first2=N. |last3=Gonzalez |first3=S. |last4=Lee |first4=K. -G. |title=Supernova 2007it in NGC 5530 |journal=Central Bureau Electronic Telegrams |date=15 September 2007 |volume=1068 |pages=1 |url=http://www.cbat.eps.harvard.edu/iau/cbet/001000/CBET001068.txt}}</ref> Further observations lead to its Type IIP categorisation. There are indications that dust was formed during the supernova, as well as of a [[light echo]]. The progenitor star had an estimated mass of 16–27 {{solar mass}}.<ref>{{cite journal |last1=Andrews |first1=J. E. |last2=Sugerman |first2=B. E. K. |last3=Clayton |first3=Geoffrey C. |last4=Gallagher |first4=J. S. |last5=Barlow |first5=M. J. |last6=Clem |first6=J. |last7=Ercolano |first7=B. |last8=Fabbri |first8=J. |last9=Meixner |first9=M. |last10=Otsuka |first10=M. |last11=Welch |first11=D. L. |last12=Wesson |first12=R. |title=PHOTOMETRIC AND SPECTROSCOPIC EVOLUTION OF THE IIP SN 2007it TO DAY 944 |journal=The Astrophysical Journal |date=10 April 2011 |volume=731 |issue=1 |pages=47 |doi=10.1088/0004-637X/731/1/47|arxiv=1102.2431 }}</ref> A search of archival photographs revealed several taken by the [[All Sky Automated Survey]], including one taken on 6 September 2007.<ref>{{cite journal |last1=Pojmanski |first1=G. |title=Supernovae 2007gw-2007kd |journal=International Astronomical Union Circular |date=2007 |bibcode=2007IAUC.8875....1P | url=http://www.cbat.eps.harvard.edu/iauc/08800/08875.html#Item1}}</ref> In this image, it was magnitude 12, making SN 2007it the brightest supernova of the year 2007.<ref>{{cite web | url = https://www.rochesterastronomy.org/sn2007/index.html | title = Bright Supernovae - 2007 | last = Bishop | first = David | website = Rochester Astronomy | access-date = 5 March 2025 }}</ref>

== References == {{reflist}}

== External links == {{wikiSky}} *[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC%205530 NGC 5530 on SIMBAD]

[[Category:Unbarred spiral galaxies]] [[Category:Lupus (constellation)]] [[Category:NGC objects|5530]] [[Category:Principal Galaxies Catalogue objects|51106]] [[Category:Astronomical objects discovered in 1837]] [[Category:Discoveries by John Herschel]]