2025RNAAS...9..157B

Query : 2025RNAAS...9..157B

2025RNAAS...9..157B - Research Notes of the AAS, 9, 157 (2025/July-0)

Avoiding (photo-z) Catastrophe.

BATTISTI A.J., DA CUNHA E., JIN S. and HODGE J.A.

Abstract (from CDS):

Spectral modeling codes that estimate photometric redshifts (photo-z) are a powerful and often reliable method for determining redshifts of galaxies. However, there are notable instances where degeneracies in spectral energy distribution (SED) colors lead to “catastrophic” failures. We highlight the case of COSBO-7, a dusty, intermediate-z galaxy that masqueraded as a high-z source, because it demonstrates a unique scenario where photo-z codes run into issues despite extensive multi-wavelength photometry. We advocate that photo-z fitting should aim to: (1) use the entire available SED (UV-radio) whenever possible to help break color degeneracies, (2) allow flexible dust attenuation prescriptions, both in terms of the attenuation curve slope and a varying 2175 Å absorption feature, and (3) implement uncertainty floors to account for limitations in spectral models and also on the photometry itself.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxies - High-redshift galaxies - Interstellar dust extinction - Spectral energy distribution - Astronomy data analysis

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 AzTEC J100024.20+021748.7 rG 10 00 23.97 +02 17 50.0           ~ 20 0

Query : 2025RNAAS...9..157B

Basic data :
AzTEC J100024.20+021748.7 -- Radio Galaxy
Other object types: otypes_help 		Rad (2012ApJ,COSMOSVLA,...), smm (S2CLS,[CCC2013],...), G (AzTEC,[CBB2012]), mm (COSMOSMAMBO,[AWA2011]), rG (2016MNRAS), LeG (2024MNRAS)
ICRS coord. (ep=J2000) : 		10 00 23.97 +02 17 50.0 (mm) [ ] C 2024A&A...690L..16J
FK4 coord. (ep=B1950 eq=1950) : 		09 57 48.81 +02 32 16.0 [ ]
Gal coord. (ep=J2000) : 		236.70676 +42.15892 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 257391 [210] / z(emission) 2.6250 [0.0007] / cz 786955 [210]
   (mm) C 2024A&A...690L..16J
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Hierarchy : number of linked objects
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Identifiers (14) :
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AzTEC J100024.20+021748.7 COSMOSVLADP J100023.98+021749.9 [CBB2012] 1HERMES X1.4 J100024.00+021750.1 [CCC2013] SMM J100023.8+021751
COSMOSMAMBO 7 S2CLS c07 [CCC2013] SMM J100024.0+021750 [KDM2016] 2
COSMOSMAMBO MM J100024+021748 [AWA2011] AzTEC/C160 [CCC2013] 850.06
COSMOSVLA J100023.96+021750.1 [BCA2007] VLA J100023.97+021750.2 [CCC2013] 450.55

References (20 between 1850 and 2026) (Total 20)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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