AAS: Seeing Star Formation at Cosmic Noon

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notFritzArgelander
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AAS: Seeing Star Formation at Cosmic Noon

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Post by notFritzArgelander »


https://aasnova.org/2021/05/14/seeing-s ... 5Yrxf5JHCs

Looking at different element enrichments to assess inflow and outflow of gas in a star forming galaxy is interesting. It will be more interesting on a sample larger than one.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: AAS: Seeing Star Formation at Cosmic Noon

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Post by turboscrew »


What's the thing about light from quasars? Predictabiity?
- Juha

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Re: AAS: Seeing Star Formation at Cosmic Noon

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Post by notFritzArgelander »


turboscrew wrote: Sat May 15, 2021 11:34 pm What's the thing about light from quasars? Predictabiity?
Good question! The QSO provides background illumination. Without a QSO in the background to illuminate the foreground galaxy one can't do the absorption line spectroscopy.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: AAS: Seeing Star Formation at Cosmic Noon

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Post by turboscrew »


But why quasars in particular? Are they the only kind of light sources strong enough? Or maybe white enough?
- Juha

Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
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Re: AAS: Seeing Star Formation at Cosmic Noon

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Post by notFritzArgelander »


turboscrew wrote: Sun May 16, 2021 5:55 am But why quasars in particular? Are they the only kind of light sources strong enough? Or maybe white enough?
The quasar is significantly more distant and much brighter than other sources. Since that difference is large there is a difference in redshift for lines of similar elements that might be in both the quasar and the foreground galaxy. QSOs are the only source bright enough in the background and at a different enough redshift to make the interpretation of the absorption spectrum straightforward.

Let's say that there was a nearer bright source, perhaps a supernova. If it were close enough to the galaxy being studied, the red shift wouldn't be that much different and it would be very difficult to interpret the absorption spectra unambiguously. What you need is a much more distant (different redshift) and therefore much brighter source to be able to do the analysis with some confidence.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: AAS: Seeing Star Formation at Cosmic Noon

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Post by turboscrew »


OK, because of both brightness and distance (red shift).
- Juha

Senior Embedded SW Designer
Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Grab 'n go: Omegon AC 102/660 on AZ-3 mount
Eyepieces: 26 mm Omegon SWAN 70°, 15 mm TV Plössl, 12.5 mm Baader Morpheus, 10 mm TV Delos, 6 mm Baader Classic Ortho, 5 mm TV DeLite, 4 mm and 3 mm TV Radians
Cameras: ZWO ASI 294MM Pro, Omegon veLOX 178C
OAG: TS-Optics TSOAG09, ZWO EFW 7 x 36 mm, ZWO filter sets: LRGB and Ha/OIII/SII
Explore Scientific HR 2" coma corrector, Meade x3 1.25" Barlow, TV PowerMate 4x 2"
Some filters (#80A, ND-96, ND-09, Astronomik UHC)
Laptop: Acer Enduro Urban N3 semi-rugged, Windows 11
LAT 61° 28' 10.9" N, Bortle 5

I don't suffer from insanity. I'm enjoying every minute of it.

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